OPINION
Wе granted allowance of appeal in this case to consider whether the Commonwealth Court erred in concluding that Appellee Township of Upper Moreland (the “Township”) could impose a Business Privilege Tax (“BPT”) on 100% of the gross receipts of Appellant Northwood Construction Company (“Northwood”), which is located in the Township but performs a substantial amount of work outside of the Township. For the following reasons, we conclude that the court erred insofar as it found that the Township’s taxation of receipts generated from Northwood’s out-of-state work did not violate the Commerce Clause of the United States Constitution, and therefore reverse that portion of the Commonwealth Court decision. In all other respects, we affirm.
Northwood is a business corporation with its principal place of business in the Township. Its primary business activities are construction management and general contracting, and it conducts those activities throughout Pennsylvania as well as in Delаware, New Jersey and Maryland.
The Township has a Business Privilege Tax Ordinance (the “Ordinance”), which imposes a Business Privilege Tax (“BPT”) on any person “engaging in a business ... in the Township.” Ordinance § 1.04. The amount of the BPT is 3.5 mills (.0035) on the gross receipts of the business, subject to certain specified exclusions, including an exclusion for gross receipts on which a “business privilege tax or similar tax has been imposed by another political subdivision by reason of the performance of the service or conducting the business in that *467 political subdivision.” Id. § 1.02(f)(4) (the “Exclusionary Provision”).
Northwood filed tax returns with the Township for the years 1995,1996,1997 and 1998. In those returns, Northwood reported as taxable gross receipts that portion of its gross receipts that were attributable to its business activity in the Township. It also paid a BPT in connection with its 1995 and 1996 returns, but it made no BPT payment in 1997 and 1998, asserting that it was due a refund for overpayments of the BPT in prior years. Specifically, Northwood claimed that in 1995 and 1996, the Township had erroneously imposed a BPT on (1) gross receipts from certain in-state activities outside of the Township that the Township could not tax, as well as (2) 100% of the gross receipts derived from out-of-state activities. The Township, however, not only denied Northwood’s refund claims, but also took the position that Northwood had underpaid the BPT in all four years at issue and demanded an additional BPT payment of $257,579.52 plus interest and penalties.
To resolve this dispute, Northwood filed a civil action in the trial court, seeking to recover the BPT it claimed to have overpaid. The Township, in turn, filed a counterclaim, asking the trial court to award it the $257,579.52 that it claimed Northwood still owed for the tax years in question. North-wood and the Township subsequently filed cross-motions for summary judgment. In conjunction with those motions, the parties filed two stipulations of facts and also certified that there were no material facts in dispute and that their dispute could therefore be resolved as a matter of law. After oral argument, the trial court denied Northwood’s motion and granted the Township’s motion, awarding the Township the $257,579.52 plus penalties and interеst that it had requested.
On appeal, the Commonwealth Court affirmed.
Northwood Construction Co., Inc. v. Township of Upper Moreland,
The Commonwealth Court next addressed Northwood’s argument that reсeipts attributable to its on-site trailers at construction sites outside the Township should be excluded from the BPT, because those trailers constituted
“bona fide
offices” and this Court’s decision in
Gilberti v. City of Pittsburgh,
The Commonwealth Court also rejected Northwood’s argument that the Township could hot tax 100% of its gross receipts because the Commonwealth Court’s prior decision in
Township of Lower Merion v. QED, Inc.,
The Commonwealth Court next turned to Northwood’s argument that the Township’s taxation of 100% of the receipts generated from Northwood’s construction sites in New Jersey, Delaware and Maryland violated the Commerce Clause of the United States Constitution.
6
As an initial matter, the court rejected Northwood’s contention that the tax violated the constitutional mandate of fair apportionment, which requires both “internal consistency” and “external consistency.” According to the court, the tax was “internally consistent,”
i.e.,
it
*471
would not result in more than one state taxing the same portion of income if it were applied in every state, because the Township had promulgated regulations requiring the apportionment of receipts for taxpayers “engaged in interstate commerce, having places of business in more than one State.”
7
Northwood Construction Co.,
The Commonwealth Court also rejected Northwood’s claims that the tax violated the Commerce Clause (1) by providing a direct commercial advantage to local business and (2) because there is no fair relation between the tax and the benefits conferred upon the taxpayer by the state. With respect to the former, the court stated that the tax did not impose a greater burden on out-of-state activities than it did on in-state activities not only because the millage rate for in-state and out-of-state activities was the same, but also because any time another state imposed a BPT on the taxpayer’s receipts, the Township Regulations ensured that the taxed receipts would be allocated to that other state and the Township would
*472
exclude those receipts from its tax.
See
Regulations. With respect to the latter argument, the court explained that there
was
a fair relation between the tax and the in-state activities because “[a]long with the privilege of maintaining its office in the Township, Northwood enjoys certain governmental services.”
On appeal to this Court, Northwood asserts that the Commonwealth Court erred in concluding that (1) the Ordinance, by its terms, permits the imposition of the BPT on gross receipts from activities performed outside the Township, and (2) the imposition of such a tax was within the Township’s authority under the LTEA. It further asserts that the Commonwealth Court erred in concluding that the Township’s imposition of the BPT on 100% of its out-of-state receipts did not violate the Commerce Clause.
Addressing each of these arguments in turn, we first reject Northwood’s assertion that the Ordinance, by its terms, does not permit the Township to tax its gross receipts from activities performed outside the Township. As the Commonwealth Court noted, section 1.04 of the Ordinance provides that:
Every person engaging in a business, trade, occupation, profession or vocation in the Township shall pay an annual Business Privilege Tax for the tax year at the rate of three and one-half (3.5) mills on his gross receipts; provided no tax will be levied on any person who has registered with the Township and whose gross receipts are Two Thousand Nine Hundred Dollars ($2,900.00) or less, provided that a tax return is filed.
Ordinance § 1.04 (emphasis added). The Ordinance further defines “gross receipts” as:
[Clash, credits, property of any kind or nature, received or allocable or attributable to any business, or services rendered, or commerciаl or business transactions without deduction therefrom on account of the cost of property sold, material used, labor, service or other costs, interest, or discount paid, or
*473 any other expense.
Ordinance § 1.02(f) (emphasis added).
Northwood argues that these provisions only authorize the Township to tax “gross receipts allocable or attributable to any business conducted within the Township.” Northwood Brf. at 27 (emphasis added); see also id. (“By it own terms, the Ordinance only imposes tax upon cash or credits ‘allocable or attributable’ to any business or services rendered in the Township.”). However, like the Commonwealth Court, we are at a loss to discern Northwood’s suggested meaning from the plain terms of the statute. While the Ordinance is clear that it only permits taxation of entities that conduct business in the Township, see Ordinance § 1.04, it also plainly provides that, once it is determined that the entity does conduct business in the Township, the amount of the tax may be calculated on the “gross receipts” attributable to “any business” of the entity. Id. § 1.02(f) (emphasis added). Moreover, while the Ordinance excludes from “gross receipts” any receipts on which the taxpаyer has already paid a BPT or similar tax to another political subdivision, see id. § 1.02(f)(4), this Exclusionary Provision is not broad enough to shield from taxation all receipts “allocable or attributable” to business outside the Township, because it is dependent upon whether or not the other subdivisions choose to impose a tax, and if so, whether that tax can be characterized as “a [BPT] or similar tax.” Id. As such, in spite of the Exclusionary Provision, the Ordinance plainly provides that the BPT is calculated on at least certain “gross receipts” without reference to where they are generated and thus, Northwood’s argument to the contrary is merit-less.
Northwood next contends that even if the intent of the Ordinance is to impose the BPT on gross receipts generated by business activity outside the Township, any such tax exceeds the Township’s authority under the LTEA and is therefore unenforceable. Again, we disagree.
“In Pennsylvania, the power to tax is statutory and must be derived from an enactment of the General Assembly.”
*474
Independent Oil and Gas Ass’n of Pennsylvania v. Board of Assessment Appeals of Fayette County,
may, in their discretion, by ordinance or resolution, for general revenue purposes, levy, assess and collect or provide for the levying, assessment and collection of such taxes as they shall determine on persons, transactions, occupations, privileges, subjects and personal property within the limits of such political subdivisions....
53 P.S. § 6902.
In
Gilberti v. City of Pittsburgh,
In support of this conclusion it is to be emphasized that the plain language of the Enabling Act provides for taxes to be levied upon privileges within the City. In enacting such a provision, the legislature surely recognized that the exercise by a taxpayer of the privilege of doing business within a taxing jurisdiction constitutes far more than the sum of individual transactions and activities which are consummated or performed within the territorial limits of the taxing entity. Indeed, having a place of business within the City enables the taxpayer to have a base of operations from which to manage, direct, and control business activities ocсurring both inside and outside the City limits. Further, the in-City office provides a place from which to solicit business, accept communications, conduct meetings, store supplies, and perform office work. All of these activities áre, in the usual course, necessary to any business operation. This is so irrespective of whether the business performs services at job sites outside of the City.
Id. at 1326. As such, we specifically concluded that “the legislature has provided for the City to collect a tax upon the privilege of having a place of business in the City” and that “the measure of that tax is not to be so limited as to ignore the *476 contribution to out-of-City activities provided by maintaining a base of operations within the City.” Id.
Under this analysis, it is clear that the Township’s imposition of its BPT on gross receipts generated from business activity outside the Township did not run afoul of the LTEA. Like the Firm in Gilberti, Northwood maintains its principal place of business within the taxing jurisdiction. While the taxation of Northwood’s gross receipts “operates in such a manner as to, in effect, tax revenues from certain transactions that occur wholly outside of the [Township],” such a tax, as we stated in Gilberti, “remains one that is levied only upon a privilege exercised within the City, to wit, maintenance of a business office and the fact that the amount of tax is dependent upon the taxpayer’s gross receipts, including receipts from services performed outside the [Township], does not undermine the legitimacy of the tax.” Id. at 1326. Thus, just as we found with respect to the ordinance in Gilberti, the Ordinance here is a legitimate exercise of the Township’s power under the LTEA to tax Northwood for the privilege of maintaining a principal place of business in the Township, which it could use to “solicit business, accept communications, conduct meetings, store supplies, and perform office work” and from which it could “manage, direct, and control business activities occurring both inside and outside the City limits.” Id.
Northwood nevertheless argues that the LTEA does not empower the Township to imposе the BPT on receipts generated from work outside of the Township, because unlike the situation in Gilberti, Northwood’s activities within the Township do not significantly contribute to that out-of-Township work. 9 Specifically, Northwood contends that unlike the Firm *477 in Gilberti, it maintains offices outside the Township, namely its temporary on-site trailers at construction sites, from which it exercises primary control over its out-of-Township activities. It therefore reasons that while the Firm’s control over out-of-City activities from its central office in Gilberti may have been sufficient under the LTEA to justify the imposition of a BPT on the receipts generated from the Firm’s out-of-City activities, the very limited control that Northwood exercises over out-of-Township activities from its Township office does not justify such a sweeping BPT.
However,
Gilberti’s
conclusion that the LTEA empowered the City to tax the Firm’s out-of-City receipts did not, as we read the decision, hinge on the fact that the Firm did not have any other offices outside of the City. Rather, it was grounded on the understanding that the Firm’s central office provided a “base of operations” from which it exercised control over its
*478
operations.
Gilberti,
Furthermore, we find significant here that the Ordinance contains the Exclusionary Provision, which provides that the Township will exclude from taxable gross receipts any receipts on which the taxpayer has already paid a BPT or similar tax to another political subdivision based on the taxpayer’s per
*479
formance of a service or conduct of business in that subdivision. Ordinance § 1.02(f)(4). Essentially, this provision ensures that to the extent that a taxpayer is exercising the privilege of conducting business in another political subdivision, and that other political subdivision concludes that the exercise of that privilege is sufficient to justify a BPT on the taxpayer’s gross receipts from activity within its boundaries,
see Township of Lower Merion,
Having rejected Northwood’s statutory claims, we turn to its contention that the Commonwealth Court erred in finding that the Township’s imposition of the BPT on 100% of North-wood’s interstate receipts did not violate the Commerce Clause of the United States' Constitution. • On this claim, we agree with Northwood that it is entitled to relief.
The United States Supreme Court has' established a fоur-part test to be applied in ascertaining whether a state or local tax violates the Commerce Clause.
See Complete Auto Transit, Inc. v. Brady,
1) is applied to an activity with a substantial nexus with the taxing state;
2) is fairly apportioned;
3) does not discriminate against interstate commerce; and
4) is fairly related to benefits provided by the state.
Id.
at 279,
This Court recognized in
Philadelphia Eagles Football Club, Inc. v. City of Philadelphia
that the “central purpose behind the apportionment requirement is to ensure that each state taxes only its fair share of an interstate transaction.”
In order to be “fairly apportioned,” a tax must be both “internally consistent” and “externally consistent.”
See Goldberg,
Here, as stated above, the Ordinance authorizes the Township to impose a BPT on the gross receipts of “[e]very person engaging in a business, trade, occupation, profession or *481 vocation in the Township.” Ordinance § 1.04; see also § 1.02(f). “Gross receipts” are defined as any “cash, credits, property of any kind or nature, received or allocable or attributable to any business,” id., but exclude “[receipts upon which a business privilege tax or similar tax has been imposed by another political subdivision by reason of the performance of the service or conducting of business in the political subdivision.” Id. § 1.02(f)(4). The Ordinance also requires that the Business Tax Office in the Township “promulgate rules and regulations setting forth methods of allocation of gross receipts for such' cases where the gross receipts of a business in its entirety are not subject to tax imposed by this Ordinance by reason of the ... Commerce Clause or [the Pennsylvania Constitution].” Ordinance § 1.02(f)(9); see full text of provision at supra n. 7. Here, as noted previously, the Township adopted Regulations, entitled “Regulations ... Providing for the Allocation of Gross Receipts in the Case of Businesses with Multi-State Offices Engaged in Interstate Commerce.” Those Regulations state:
2. Allocation. In the case of transactions involving interstate commerce, in conformity with the commerce clause of the United States Constitution, the apportionment of gross receipts will be made upon the following formula:
(Rеceipts within Commonwealth of PA x 100%) + (Receipts without Commonwealth of PA x apportionment factor) =
Gross Receipts that Tax is applied to.
Regulations at ¶ 2. Moreover, the Regulations further provide that:
The apportionment factor shall be the product of the averaging of the total of the following percentages:
(i) Wages, salaries, commissions, and other compensation in Township, as a percentage of total wages, salaries, commissions and other compensation.
(ii) Receipts in Township as a percentage of total receipts. •
(iii) Value of the tangible property and real property owned or leased and situated within the Township as a *482 percentage of total tangible personal and real property owned or leased.
Id.
As stated above, in assessing internal consistency, we must consider whether, if every state applied the Ordinance and the accompanying Regulations, taxpayers would be subjected to a risk of multiple taxation. Considering the Ordinance and Rеgulations, but initially excluding from consideration the Ordinance’s Exclusionary Provision, it would appear that there would be such a risk. 12 Indeed, in initially providing for the taxation of all receipts of any entity that engages in any business in the Township, the Ordinance authorizes the Township to tax not only businesses with permanent offices in the Township, but also any businesses that come into the. Township to, inter alia, sell products, provide services, or merely transport goods. Meanwhile, the Regulations only require the Township to apply its apportionment formula to a taxpayers’ receipts, and thereby exclude certain out-of-state receipts from taxation, “in the Case of Businesses with Multi-State Offices Engaged in Interstate Commerce.” Regulations (emphasis. added); see also Regulations ¶ 1 (requiring that the Township apportion receipts generated by businesses “having places of business in more than one State”) (emphasis added); Township Brf. at 20 (“[T]his regulation applies to businesses with [bona fide ] offices or locations outside of the Township”). *483 Thus, assuming as we must that all states have adopted this same taxation scheme, any state in which a taxpayer conducts business would only apply the Regulations’ apportionment formula to exclude from taxation those reсeipts generated from activities in other states in which the taxpayer has an office. 13
The risk of multiple taxation in this scheme (again, absent the Exclusionary Provision) can be exemplified by considering a hypothetical taxpayer that has a single office in Pennsylvania, but provides services in New Jersey and Delaware as well as Pennsylvania. Because the taxpayer “engages in business” in all three states, all three states could, under the universally applicable Ordinance, impose a BPT on 100% of the taxpayer’s gross receipts. The Regulations would apparently require New Jersey and Delaware to apportion their tax to take into account the receipts attributable to the business office in Pennsylvania, but New Jersey would not be required to exclude from its tax the receipts generated in Delaware and, likewise, Delaware would not be required to exclude the New Jersey receipts from its tax. 14 Meanwhile, the Regulations would not require Pennsylvania to conduct any apportionment, *484 as the taxpayer has no offices in New Jersey or Delaware and the Regulations only require apportionment of receipts generated from offices in other states. Accordingly, although only Pennsylvania would tax the Pennsylvania portion of the taxpayer’s receipts, the New Jersey and Delaware portions of the receipts would be taxed in all three jurisdictions.
It is therefore clear that if the Ordinance did not also exclude from taxable gross receipts those receipts on which the taxpayer has already paid a BPT or similar tax to another jurisdiction “by reason of the performance of the service or conducting the business in that political subdivision,” Ordinance § 1.02(f)(4), it would not survive constitutional scrutiny under the internal consistency test. However, we agree with the Township that the existence of the Exclusionary Provision ultimately ensures that there is no risk of multiple taxation under the hypothetical circumstances in which internal consistency is considered.
Cf. Goldberg,
We do not reach the same conclusion when considering the “external consistency” prong of the fair apportionment test. Whether a tax is “externally consistent” is determined by applying a “subjective test that asks whether a state taxed only that ‘portion of the revenues from the interstate activity which reasonably reflects the instate component of the activity being taxеd.’ ”
Philadelphia Eagles,
In the instant case, Northwood has adequately established that income attributed to the Township is “out of all appropriate proportion to” the business transacted in the Township and has no “rational relationship” to Northwood’s business in the Township. There is apparently no dispute that North-wood engaged in interstate commerce and that a significant portion of Northwood’s receipts in the relevant tax years were generated at construction sites in Delaware, New Jersey and Maryland. 17 Nevertheless, the Township has imposed its BPT on 100% of Northwood’s receipts from interstate commerce, without making any attempt to allocate those receipts for instate versus out-of-state activity. 18
In finding that the external consistency requirement was satisfied, the Commonwealth Court merely stated as follows:
*487 The Township taxes only that portion of a company’s revenues from interstate activity that reasonably reflects the company’s maintenance of a permanent business office in the Township. In other words, the Township can justify a tax on the privilege of maintaining an office within the Township, where, from that office, a company is able to manage, direct and control all of its interstate business activities. See Gilberti.
Northwood Construction Co.,
Moreover, on constitutional grounds, we simply cannot accept the Commonwealth Court’s ultimate conclusion that Northwood’s maintenance of its primary business office in the Township permits the Township to tax 100% of Northwood’s receipts generated in connection with interstate activity. The Commonwealth Court characterized the tаx as one on the privilege of maintaining an office in the Township, and thus, concluded that it taxes in-state activity only. However, when considering the constitutionality of a gross receipts tax, it is the activities that
generate
those gross receipts that are determinative in an apportionment analysis as it is only the receipts generated from the in-state component of the underlying activity that the Township may properly tax under constitutional apportionment principles.
See Jefferson Lines,
The Township essentially takes the position that it is under no obligation to allocate Northwood’s receipts among the other states in which Northwood conducts business, because the Exclusionary Provision ensures that there is no risk of multiple taxation. In forwarding this argument, the Township essentially ignores Supreme Court precedent that the “central purpose behind the apportionment requirement is to ensure that each state taxes only its fair share of an interstate transaction,”
Goldberg,
In sum, we hold that the Ordinance and Regulations are within the Township’s authority under the LTEA, but nevertheless find them unconstitutional under the Commerce *490 Clause of the United States Constitution. Accordingly, we reverse the decision of the Commonwealth Court below insofar as it concluded that the Commerce Clause does not require apportionment of Northwood’s receipts, but affirm it in all other respects.
Notes
. Northwood maintains that its trailers constitute bona fide "field offices," essentially because they (1) have telephone, fax and utility services, copier facilities, and restroom facilities, (2) are used by North-wood employees for employee meetings as well as for meetings with customers, subcontractors, and vеndors, (3) house job records, drawings, specifications schedules, and employee records for employees working the site, and (4) are subdivided into three separate offlces/conference rooms. Northwood Brf. at 2-3 (citing Second Stipulation of Facts at ¶¶ 8-14). Moreover, Northwood points out that at each site, it employs full time on-site personnel to conduct the daily operations required to manage the construction activity. Id. at 3 (citing Second Stipulation of Facts at ¶ 15).
. The court also commented that
G.A. & F.C. Wagman, Inc. v. Manchester Twp.,
. Act of December 31, 1965, P.L. 1257, 53 P.S. §§ 6901-6924.
. In support of this statement regarding how the courts have interpreted section 6908, the
Township of Lower Merion
court cited to
Gilberti
and the Commonwealth Court opinion in
Airpark Int’l I v. Interboro School District,
. The parties stipulated that "Northwood paid a privilege tax or similar tax to certain jurisdictions within Pennsylvania, such as Bensalem, Philadelphia, and Warminster, and the Township has excluded receipts from those jurisdictions for purposes of computing Norlhwood’s receipts subject to the BPT.” Second Stipulation of Facts at ¶ 20, R.R. 11a.
. The Commerce Clause states that "Congress shall have Power ... [t]o regulate Commerce with foreign nations, and among the several States....” U.S. Const., art. I, § 8, cl. 3.
. The Township promulgated these regulations pursuant to section 1.02(f)(9) of the Ordinance, which provides that:
The [Business Tax Office of the Township] shall promulgate rules and regulations setting forth methods of allocation of gross receipts for such cases where the gross receipts of a business in its entirety are not subject to tax imposed by this Ordinance by reason of the provision of the Commerce Clause of the United States Constitution or under the Constitution of the Commonwealth of Pennsylvania.
Ordinance § 1.02(f)(9).
. Notably, there was no claim in Gilberti that the City's tax violated the Commerce Clause as none of the receipts at issue apparently arose out of interstate commerce. See id. at 1325.
. This argument appears at the very end of Northwood’s brief, almost as an afterthought. See Northwood Brf. at 37. Nevertheless, it is Northwood’s оnly argument that even attempts to explain why the language of the LTEA should be interpreted as empowering Pittsburgh to enact the taxation scheme at issue in Gilberti, but not empowering the Township to enact the BPT at issue here.
Northwood's primary argument regarding Gilberti is that it is not controlling here because the Ordinance is "not nearly as expansive as *477 the [Gilberti] ordinance.” Northwood Brf. at 32. However, we fail to see how this argument works in Northwood’s favor. As an initial matter, we have already rejected Northwood’s factual premise that unlike the Gilberti ordinance, the Ordinance here only permits the Township to tax those receipts allocable or attributable to business conducted within the Township. See supra pp. 8-9. Moreover, even assuming arguendo that Northwood was correct that the Ordinance here is "not nearly as expansive as the [Gilberti ] ordinance," North-wood Brf. at 32, that fact would make it more likely that the Township had power under the LTEA to enact the Ordinance, not less so. Accordingly, Northwood's argument in this regard is simply meritless.
Northwood goes on to argue that if we conclude that
Gilberti
is relevant to our analysis as to the scope of the Township's powers under the LTEA, we should find that the trailers Northwood maintains on its construction sites are
bona fide
offices and that the receipts from those trailers are therefore subject to an exemption under the
Gilberti
ordinance. However, this argument again misses the mark. Simply put, our reliance on
Gilberti
in concluding that the Township's enactment of the BPT at issue here was within the scope of its authority under the LTEA has nothing to do with the text of the ordinance in
Gilberti
and in no way rests on a conclusion that the text of the
Gilberti
ordinance is applicable here. Rather, we merely reiterate that, pursuant to
Gilberti: (1)
the LTEA authorizes a municipality to tax a business whose principal office is within its borders for the
privilege
of maintaining that office within the municipality, and (2) the measure of that tax can include receipts from work outside the municipality, based on a recognition that the maintenance of "a base of operations" within the municipality contributes to a business’s ability to conduct activities outside of the municipality.
.
G.A. & F.C. Wagman
involved a highway construction company that had its sole permanent office in Manсhester Township, Pennsylvania, but performed the majority of its business outside of Manchester Township. Furthermore, individual projects of the company were "often supervised by temporary on-site offices,” "many employees ha[d] little or no direct contact with the home office, and payments for services [were] often received outside the township.”
. North wood alternatively urges us to overrule
Gilberti
and analyze the validity of the Township’s BPT on receipts from its in-state, but out-of-Township, activities based on a test similar to that utilized in ascertaining whether taxes on interstate commerce conform with the federal constitutional dictates of the Commerce Clause. However, we decline to do so for two reasons. First, we are constrained by the doctrine of
stare decisis. See Commonwealth v. Tilghman,
. We consider the internal consistency of the Ordinance and Regulations both with and without the Exclusionary Provision not only to emphasize the import of the Exclusionary Provision, but also because Northwood's argument that the Ordinance is internally inconsistent largely ignores the Exclusionary Provision. Northwood apparently takes this approach because it asserts that the Township itself has largely ignored the Exclusionary Provision as it has not excluded from its BPT those receipts on which Northwood has paid taxes to other states. See infra n. 18. However, whether or not the Township has erred in failing to provide Northwood with certain exclusions for receipts on which Northwood has paid taxes to other states, we will not follow Northwood's lead and ignore the Exclusionary Provision in our internal consistency analysis as the provision is an integral part of the Township’s taxation scheme and thus, must be considered in ascertaining whether that scheme, if applied in every state, would result in multiple taxation.
. Northwood notes that the Regulations state that the Township is to allocate receipts whenever a taxpayer has a "place of business” in another state and further asserts that its out-of-state construction trailers constitute qualifying "placets] of business.” However, the Township takes the position that the Regulations only require it to allocate a taxpayer's receipts when the taxpayer has a bona fide office outside of Pennsylvania and given the title of the Regulations, which refers to "Multi-State-Offices," we accept this interpretation for purposes of this appeal. See Regulations (emphasis added); Township Brf. at 20 ("Under the Triаl Court’s ruling that the trailers used by Northwood do not constitute bona fide offices, there was no location outside of the Township which would trigger the use of the apportionment regulations.”). Of course, our acceptance of the Township’s interpretation ultimately renders the Regulations more susceptible to invalidation under the Commerce Clause.
. It is not entirely clear under the Regulations that New Jersey and Delaware would even be required to apportion their tax, because taken at face value, the Regulations only demand that receipts for businesses with "Multi-State Offices” be allocated, see Regulations, and our hypothetical business has only a single office in Pennsylvania. However, whether or not New Jersey and Delaware apportioned the taxpayer’s receipts pursuant to the Regulations, our analysis under the internal *484 consistency test is essentially the same. See infra n. 16 and accompanying text. That is, in the absence of the Exclusionary Provision, the tax would be internally inconsistent.
. If the state in which certain receipts were generated chose not to tax those receipts, the risk of multiple taxation would recur because under *485 those circumstances, the other states in which the taxpayer conducted business could tax the non-taxing state’s receipts, without exclusion. However, we need not be concerned with such a variation as the internal consistency test requires us to hypothesize the complete replication of the challenged state’s tax in other states and thus, we must presume that all states levy and collect the taxes to which they are entitled under the lax scheme at issue.
. In addition, if New Jersey and Delaware had not already excluded Pennsylvania receipts pursuant to the Regulations, see supra n. 14, they would be required to do so pursuant to the Exclusionary Provision.
. By way of example, of Northwood's nearly $35 million in gross receipts reported on its 1996 federal tax return, approximately $15.5 million were attributable to Pennsylvania, $15.4 million were attributable to New Jersey, $3 million were attributable to Delaware and $1.1 million were attributable to Maryland. See Stipulation of Facts at ¶ 20, R.R. 6a-7a. Similarly, of Northwood's nearly $42 million in gross receipts reported on its 1998 federal tax return, approximately $27 million were attributable to Pennsylvania, $14 million were attributable to New Jersey, and $813,000 were attributable to Delaware. Id.
. As stated above, supra n. 12, the Township has not utilized the Exclusionary Provision to exclude from Northwood's taxable gross receipts any receipts on which taxes were paid to other states, apparently taking the position that any tax that Northwood paid on such receipts did not constitute a "business privilege tax or similar tax ... imposed by another political subdivision by reason of the performance of the service or conducting of business in the political subdivision.” Ordinance § 1.02(f)(4).
. Of course, Northwood does not agree with this premise as it contends that in spite of the Exclusionary Provision, its receipts have been taxed twice because the Township has refused to provide it with the exclusions to which it is entitled. See supra nn. 12, 18.
. Althоugh application of the Exclusionary Provision should, in theory, reduce the extent to which interstate receipts are taxed, it has obviously not done so here. Northwood asserts that this is due, at least in part, to the Township's failure to apply the provision properly. See supra nn. 12, 18. However, the record in this case is insufficient to determine whether Northwood is correct in this regard and in any event, whether the Township should have given Northwood certain exclusions is immaterial to our resolution of whether the tax that the Township has actually imposed violates the Commerce Clause.
Moreover, even assuming that the Township should have given Northwood some exclusions for receipts on which taxes were paid to other states under the Exclusionary Provision, we feel compelled to note that we have no confidence that such exclusions would fully resolve any external consistency problem, because their availability is entirely dependent on the whims of other states, which may or may not impose a BPT or similar tax on receipts that are properly allocated to them.
