As part of their residential property, Gary and Inge White owned two small apartments over their garage. Over a period of 32 years they annually rented the apartments to various tenants. During that time Gary White became owner of over 80% of the shares of a trucking company, which, after several years of operation, became bankrupt and ceased doing business. The Central States, Southeast and Southwest Areas Pension Fund (“Central States”) assessed substantial withdrawal Lability but was able to collect from the company only a fraction of the amount owed. After considerable delay, Central States sued the Whites for the balance owed. The district court concluded that the garage apartment rental activity met the statutory requirements for the Whites’ liability as common owners under the Mul-tiemployer Pension Plan Amendments Act of 1980 (“MPPAA”) and held them liable *638 for $16 million. The Whites appeal, and we reverse.
I. BACKGROUND
A. Apartment Rental
In anticipation of his marriage to Inge in June 1969, Gary White purchased a home in downtown Detroit. Inge’s name was added to the title in 1973. At the time of the purchase, thе home’s detached garage had two overhead apartments which the previous owner had rented. Mr. White agreed to honor the lease agreements with the current tenants, and after some discussion with Mrs. White after their marriage, they decided to continue to rent the apartments. At the time Mr. White was self-employed, and because his job required frequent out-of-town travel, they valued the added security of the tenants’ presence on the property. Thus, they continued to rent the apartments, primarily to students at nearby Wayne State University, until they sold the property in 1996.
During the time the Whites leased the garage apartments, they deposited rental income into and paid expenses out of joint bank accounts. Typically, Inge showed prospective tenants the apartments and talked to them about rent and availability. Either Inge or Gary handled routine cleaning and maintenance problems, including contacting repair workers and paying the bills.
During the 32 years that they owned the property, the Whites rеported income and expenses from the apartment rental on Schedule E, “Supplemental Income and Loss,” of their federal income tax return. According to an arrangement with the IRS, common expenses such as mortgage interest, homeowner’s insurance, real estate taxes and landscaping, were attributed % to the Whites’ home and % to the garage apartments. Of particular significance, as will be shown below, the Whites reported rental income from the garage apartments of $4,500 on their 1992 federal income tax return. While this annual income over the years would appear to be a modest financial benefit, in fact it has resulted in an assessment against the Whites in the amount of $16 million. Here’s why.
B. Trucking Operation
During the 1970’s, Mr. White began working for Ford Motor Company, and in 1986, he served as its Director of Minority Business Development. Seeking to expand Ford’s minority supplier program, members of Ford’s senior management urged White to purchase a trucking company, Trans Jones, which owned a subsidiary named Jones Transfer (referred to jointly as “Trаns Jones Companies”). Mr. White did purchase the company, and became its CEO. At the time he purchased Jones Transfer, it was subject to collective bargaining agreements with various local Teamsters unions which required it to make contributions to the Central States, Southeast and Southwest Areas Pension Fund on behalf of bargaining unit employees. This business venture turned out to be unsuccessful and the Trans Jones Companies filed for bankruptcy, ultimately going out of business in December 1992. As a result, Central States determined that Jonеs Transfer had completely withdrawn from the Pension Fund as of December 27, 1992 and assessed its withdrawal liability at that time at approximately $7 million.
Although the Whites contend otherwise, see infra n. 7, in January 1993, Central States allegedly made a demand for payment upon Jones Transfer for withdrawal liability in the amount of $7 million. In March 1993, Central States requested certain financial information from Gary White, including copies of his most recent personal income tax returns. Mr. White provided Central States with the request *639 ed information, inсluding his tax returns which, as we have noted, indicated his receipt of rental income from the garage apartments. Central States then engaged in arbitration with the Trans Jones Companies, ultimately receiving approximately $386,000 from the bankruptcy proceeding and $4,300 from a lawsuit against other corporate affiliates of the Trans Jones Companies.
C. Personal Liability for $16 Million
Almost six years after Central States settled with Jones Transfer for its withdrawal liability, Central States filed suit against the Whites, seeking to hold them personally liable for thе company’s withdrawal liability. In its complaint, Central States alleged that the Whites’ garage apartment rental activities constituted a trade or business which, along with Jones Transfer, was under the Whites’ common control. Because each employer of a trade or business under common control is jointly and severally hable for the other’s withdrawal liability, Central States contended that the Whites were personally liable for the liability, which had grown to over $16 million. 1 The district court agreed with Central States, granting it summary judgment and holding the Whites personally liable for $16 million of withdrawal liability. The Whites appeal.
II. DISCUSSION
A. Standard of Review
Initially, we consider the applicable standard of review. Generally, this court reviews a grant of summary judgment
de novo,
viewing all of the facts and drawing all reasonable inferences therefrom in favor of the nonmoving party.
Oest v. Illinois Dep’t of Corrections,
Central States would like us to review the district court’s decision for clear error, arguing that where the court is reviewing a set of undisputed facts, and is merely applying settled law to those facts, a lower and less stringent standard applies. In support of this position, Central States cites
Central States, Southeast & Southwest Areas Pension Fund v. Personnel, Inc.,
B. Withdrawal Liability
Under the Employee Retirement Income Security Act (“ERISA”), 29 U.S.C. §§ 1001-1371, as amended by the MPPAA, 29 U.S.C. §§ 1381-1461, an employer who ceases to contribute to a multi-employer pension fund is liable for withdrawal liability.
See Central States, Southeast & Southwest Areas Pension Fund v. Ditello,
1. Common control.
Under the statute, “common control” is defined with relation to Internal Revenue Code Section 414(c).
See
29 U.S.C. § 1301(b)(1). The parties do not dispute that the Whites’ rental activities and Jones Transfer are under common control, as defined by the statute and the regulations.
4
*641
Instead, they dispute whether the activities need to be economically related to
one
another in order to be under common control.
5
The Whites argue that requiring an economic nexus furthers ERISA’s purpose, which is “to prevent employers
from
avoiding withdrawal liability by fractionalizing their operations.”
Personnel,
Until very recently, our case law has been less than clear on this point.
Compare Personnel,
2. Trade or business.
Even though Jones Transfer
and
the Whites’ garage apartment rental activities are under common control, the ■Whites are not necessarily subject to Jones Transfer’s withdrawal liability. Rather, as noted above, we must also examine whether the garage rental activities constitute a “trade or business” for purposes of Section 1301(b)(1). We construe statutory terms according to their ordinary, common meaning unless they are defined by the statute.
Fulkerson,
238
*642
F.3d at 895. The MPPAA does not define the phrase “trade or business,” and both parties devoted a great deal of their briefs to the apparent conflict between
Personnel .
and
Ditello
regarding the appropriate test for determining whether an activity is a trade or business. In
Personnel,
in interpreting the phrase “trade or business,” this court looked to Internal Revenue Code Section 162(a), which allows a taxpayer to deduct expenses incurred in carrying on a trade or business, and to the Supreme Court’s decision in
Commissioner of Internal Revenue v. Groetzinger,
We have recently resolved this dispute and reaffirmed that the
Groetzinger
test is appropriate for determining whether an activity is a trade or business for purposes of Section 1301(b)(1).
Fulkerson,
In Fulkerson, this court had occasion to address the distinction between a trade or business and an investment. The Fulker-sons owned a trucking company, Holmes, which went bankrupt and incurred withdrawal liability. Completely separate from their ownership of Holmes, the Fulk-ersons bought three parcels of land on which Holmes built trucking terminals and subsequently sold them back to Mr. Fulk-erson. He then leased the land and terminals, through a triple-net lease (i.e., one in which the tenant incurs many of the obligations of rental such as maintenance, operating expenses, real estate taxes and insurance), to Action, another trucking company owned by his sons (in which Mr. and Mrs. Fulkerson had no interest or participation). According to Mr. Fulker-son, he did not spend more than five hours per year in connection with the properties. His activities consisted of depositing the rent checks, mаking mortgage payments and reporting the rental income on Schedule E of his federal income tax forms for supplemental income.
*643
Central States sought to impose personal liability on the Fulkersons for Holmes’ withdrawal liability, arguing that their rental activity was a trade or business, and together with Holmes, was under their common control. The district court agreed and granted summary judgment to Central States. However, on appeal, applying the
Groetzinger
test, this court concluded that the district court had erred in relying solely on the Fulkersons’ holding of the leases for ten years to support its conclusion that the leasing activity constituted continuous and regular conduct. Rather, we held that “mere ownership of property (as opposed to activities taken with regard to the property) cannot be considered in determining whether conduct is regular or continuous.”
Id.
at 895-96. Central States had argued that the Fulkersons had engaged in such activities “with regard to the property” by selecting the properties, negotiating purсhases and negotiating the leases. However, this court concluded that a reasonable fact-finder could determine that these leases were an investment and that the activity was not sufficiently continuous and regular to constitute a trade or business.
Id.
at 897.
Contrast Personnel,
Applying the
Groetzinger
test to determine if the Whites’ rental activity is a trade or business, we conclude that it does not rise to such a level. First, it does not appеar that the Whites rented their garage apartments for the primary purpose of income or profit. Central States, however, insists that the Whites’ primary purpose in renting the apartments was mainly income or profit. Although they certainly realized income and received certain tax benefits from the rentals, the Whites’ testimony reflects that an important, if not primary, purpose for renting the apartments was the added security of the tenants’ presence. There is no evidence that the apаrtments were a deciding factor tipping the scales in favor of the Whites’ decision to purchase the home. The apartments, and their tenants, predated the Whites’ purchase and, initially, the Whites merely agreed to honor the existing tenants’ leases. However, we need not resolve this issue (nor remand the case for a factual determination) because, regardless of the Whites’ primary purpose, we conclude that their engagement in the rental activities was more akin to purely personal investment, and thus was not sufficiently continuous or regular to constitute a trade or business.
See Higgins,
In nearly every way, the Whites’ conduct resembles that of the Fulkersons, from the manner of depositing rent checks to the tax treatment of the rental income and expenses. While the Whites performed more upkeep, such as maintaining the property and performing routine repairs and cleaning, this involvement is not legally significant. The Whites’ garage apartments were appendages of their primary residеnce. Such normal upkeep ben-efitted them personally as it maintained the value of their home. Their activities did not benefit a trade or business that could be easily separated from the normal maintenance and upkeep that every homeowner performs. The Whites simply purchased and cared for their primary residence, which happened to include a garage with two apartments, and lived in it for 32 years.
Contrast Personnel,
Central States argues that several factors compel the conclusion that the Whites were engaged in a business: that they obtained actual and substantial tax benefits from renting the property, that they satisfied their mortgage and increased the equity in the property through the rental income, and that they obtained deductions and depreciation. We find these arguments unconvincing. The same such arguments could be made about any other traditional investment activity. 7
3. Fractionalization.
Our conclusion that the Whites’ rental activity does not amount to a trade or business furthers Congress’ purpose in enacting the statute. “Congress enacted § 1301(b) in order to prevent businesses from shirking their ERISA obligations by fractionalizing operations into many separate entities.... ”
Bd. of Trustees of the Western Conference of Teamsters Pension Trust Fund v. H.F. Johnson, Inc.,
Central States’ frustration is understandable, but its reaction is not commendable. Because of Jones Transfer’s bankruptcy, Central States has incurred what began as $7 million and is now $16 million in unfunded vested pension benefits. They argue the Whites had a separate, commonly owned business that should expose them to personal liability for the company’s $16 million debt, a demand that surely would have caused the Whites’ personal bankruptcy. A law with the sound purpose of preventing fractionalization should not be stretched to such an extreme application that would expose a common owner of a completely unrelated personal business to such withdrawal liability. The Whites’ two apartments did not offend Congress’ purpose designed to prevent businesses from shirking their ERISA obligations. In any event, an owner of a business that is obligated to pay contributions to a commоn pension fund may need to take extra caution in engaging in real estate and other personal investment activities. See Susan C. Glen, “Central States v. Personnel, Inc.: When Real Estate Investments Create Personal Liability under the Multiemployer Pension Plan Amendments Act of 1980,” 78 Minn. L. Rev. 501, 524-25 (1993) (finding that the imposition of personal liability may cause the average *645 small business owner to avoid ownership of real property). 8
III. CONCLUSION
The Whites’ limited rental activities involving their primary residence are personal in nature and do not rise to the level of a “trade or business” for purposes of the MPPAA. Thus, the distriсt court erred in its conclusion that the Whites were personally liable for the Trans Jones Companies’ withdrawal liability. Accordingly, we reverse the judgment of the district court and remand for the entry of summary judgment in favor of the Whites.
Notes
. As of December 31, 1999, the Whites' net worth, including amounts held in tax qualified plans, was approximately $1.4 million.
. The district court denied the Whites' jury demand as moot, given its grant of summary judgment, and the Whites did not appeal this ruling. In their opening brief, they stated that the applicable standard of review was de novo. However, in its response, Central States challenged this statement and the Whites addressed its argument in their reply brief, arguing that they requested, and are entitled to, a jury trial. Central States moved to strike those portions of the reply brief, arguing that the Whites did not address this issue in their initial appellate brief and had waived the argument. However, that portion of the Whites' reply brief, prompted by Central States’ standard of review argument in its response brief, necessarily included a consid *640 eration of whether the nonmoving party requestеd a jury trial. Accordingly, it was appropriate for them to first raise it at that point and Central States’ Motion to Strike is denied.
. In this case, Central States seeks to hold the Whites, as owners of their garage apartments, liable for Jones Transfer’s withdrawal liability. We want to be clear that Central States is not claiming, nor may it claim, that the Whites are liable because Mr. White was the majority shareholder of Trans Jones. Generally, controlling shareholders and corporate officers are not employеrs and therefore may not be personally liable for a company's withdrawal liability in the absence of facts justifying the piercing of the corporate veil under state law.
See Levit v. Ingersoll Rand Fin. Corp.,
. The Whites' rental activities and Jones Transfer qualify as a "brother-sister” group, one in which the same five or fewer people have a controlling interest and over which those same five people exercise effective control. 26 C.F.R. § 1.414(c)-2(c). A "controlling interest” in a corporation is ownership of at least 80% of the voting shares and, in a partnership, it is ownership of at least 80% of the profits, interest or capital interest. See 26 C.F.R. § 1.414(c) — 2(b)(2). "Effective control” is demonstrated by ownership of at least 50% of the combined voting power of all the voting stock of a corporation and by ownership of at least 50% of thе profits, interest or capital interest of a partnership. See 26 C.F.R. § 1.414(c)-2(c)(2). Here, all of the stock of Jones Transfer, the entity incurring withdrawal liability, was owned by Trans Jones, *641 93.53% of the stock of which was owned by Mr. White. His interest therein is attributed to his wife. See 26 C.F.R. § 1.414(c)-4(b)(5)(i). Since the Whites owned 100% of their garage rental activity (i.e., their home), the leasing activity and the Trans Jones Companies are under “common control.”
. It is undisputed that the Whites never rented the apartments to anyone working for or connected with Trans Jones or Jones Transfеr and that those companies never engaged in any business transactions with the Whites personally, nor did the companies ever provide them with any money or thing of value for use in the rental of the apartments.
. We note the irony, however, that while courts have typically held that the businesses do not have to be “related,” most of the cases involved a business which leased properly to the business incurring withdrawal liability.
See Slotky,
. The Whites also argue that there are genuine issues of material fact regarding whether the Trans Jones Companies received Central States' notice and demand of payment of withdrawal liability, whether they were actually engaged in rental activities on December 27, 1992, regarding their intent (for profit or otherwise) in renting the apartments, and whether Mrs. White intended to join her husband in the rental activity. Even assuming that these questions were resolved in Central States' favor, we would still conclude that the Whites’ activities do not constitute a trade or business for purposes of Section 1301(b)(1). Accordingly, we need not address whether these additional issues should also have precluded summary judgment.
. In addition to their statutory arguments, the Whites have urged us to determine whether the imposition of personal liability for $16 million in withdrawal liability based on their rental income of approximately
$5,000
per year constitutes a violation of their rights under the Due Process and Taking Clauses of the Fifth Amendment. However, given our holding regarding the interpretation of the MPPAA, we need not reach their constitutional arguments.
See United States v. Bloom,
