Susan Cooper Houben’s dispute with her former employer Telular Corporation about commissions it owed her is making its second appearance before this court. The first time, we affirmed a jury’s decision to award Houben $98,364 for Telular’s failure to pay her commissions due under the Illinois Wage Payment and Collection Act (IWPCA), 820 ILCS 115/1, et seq., but declined to resolve whether Telular owed additional post-trial statutory penalties under IWPCA for failing to pay the judgment within 15 days after it was docketed. After this court remanded for resolution of that issue, the district court concluded that Telular was not subject to any additional IWPCA penalties and denied Houben’s writ of execution, indicating without extensive explanation that “the penalty provisions of the IWPCA do not apply under the circumstances of this case.” We agree, although not necessarily for the reasons the district court implied, and we therefore affirm its judgment.
I
The facts of this case are set out in detail in our prior opinion,
Houben v. Telular Corp.,
Telular filed a timely motion for judgment as a matter of law or a new trial under Rule 59, which the district court denied in open court on June 10. At that time Houben for the first time raised the issue of the possible application of § 115/14(b) and asked that Telular post a $350,000 bond to cover the judgment and accruing penalties. Five days later, Telu-lar tendered to Houben a check for $98,364, the full amount of wages awarded by the jury. Houben refused the check, asserting that Telular had failed to make payment within 15 days of the date of judgment as required by IWPCA, and that she was therefore already owed an additional $26,557.28.
*1030 Telular then filed a motion for stay of the judgment and approval of a supersede-as bond. On June 22, the district court heard the motion and set the bond at $120,000. The court declined to rule definitively on the applicability of IWPCA’s penalty provision but orally stated that, if it did apply, any further accrual of penalties would be stayed.
On November 3, 2000, this court affirmed the jury’s verdict. In so doing, we noted that the dispute over the IWPCA penalty provision’s applicability remained live, but that this fact did not deprive us of jurisdiction because, like attorneys’ fees and postjudgment interest, the right to such a payment depended entirely on post-judgment facts.
Houben,
II
The central question on this appeal is whether the district court was required to apply the penalty provision of the IWPCA, § 115/14(b), or if the statute was inapplicable for one reason or another. The district court thought that § 115/14(b) did not apply “under the circumstances of this case.” It explained that Telular “has promptly complied with all the final rulings which established the amount of plaintiffs disputed wages at both the trial and appellate levels well within the time period provided by IWPCA,” and that “[njothing in the •record supports a finding that defendant should be penalized under IWPCA.” Hou-ben disputes both of those conclusions in her appeal: first, she claims that the time for Telular’s payment began to run on the day the original final judgment was docketed, which was May 20, 1999 (not May 18), and that Telular failed to pay within the required time of that date; second, she argues that the statute does not contain any implicit requirement of bad faith on the part of the defendant and thus it does not matter whether the court thought Te-lular deserved punishment or not. Telular responds that the Illinois statute cannot be applied in a federal court in any event, because under the doctrine of
Erie R.R. v. Tompkins,
Athough, as we explain below, it is quite clear that Telular would not be liable for additional penalties if the normal rules for the payment of federal judgments apply, the parties dispute whether Telular owes extra penalties under state law. If it does not, then there would be no conflict in any event between federal law and state law, and we would be spared the need to decide which body of law governs. We therefore begin with a closer look at § 115/14(b), which reads as follows:
Any employer who has been ordered by the Director of Labor or the court to pay wages due an employee and who shall fail to do so within 15 days after such order is entered shall be liable to pay a penalty of 1% per calendar day to the employee for each day of delay in paying such wages to the employee up to an amount equal to twice the sum of unpaid wages due the employee.
*1031
Illinois courts have indicated that the purpose of this provision is to ensure that employees who win wage cases receive timely and complete payment of the amounts due without retaliation or foot-dragging by employers.
Doherty v. Kahn,
From the brief comment in the district court’s order to which we referred earlier, it seems that the court may have believed that the relevant starting point in federal court for the IWPCA was the date on which a timely motion under Rules 50 and 59 was denied. This may be why the court thought that Telular had complied with all final rulings well within the time periods provided by the statute. The date on which timely post-trial motions are resolved is the date on which a federal judgment becomes final for other purposes, most importantly taking an appeal to the proper court of appeals, see 28 U.S.C. § 1291 and fed. R. App. P. 4, and so this might have seemed the most logical way to interpret the various rules to the district court. It also appears that the court believed that there was an equitable element to the IWPCA penalty scheme.
The latter position, however, has not been endorsed by the Illinois courts. In the only case to address this very issue, the Illinois Appellate Court held that “[t]o assert a claim for interest penalties, all that need be shown is that there is an order for back wages issued ... by a court and that the amount due has not been paid.”
Miller v. Kiefer Specialty Flooring, Inc.,
One way or the other, therefore, we must consider an Erie issue. If, in a federal court, a federal rule governs the moment at which an “employer ... has been ordered by ... the court to pay wages due an employee,” then it is possible that the normal federal rule for when a district court judgment is final should apply and we should use June 10 in this case. If, on the other hand, the state court’s *1032 interpretation of the effect that post-judgment motions have in Illinois state courts (that is, no effect) is so intimately tied up with the IWPCA that a state rule should govern, then May 20 is still the operative date. In that case, we must decide whether Illinois’s statutory penalty rule is a rule of substance that the federal court was bound to apply, or if it is a rule regulating procedure that has no effect in federal court.
Although the Erie doctrine is a familiar one, it is notorious for the subtle distinctions it requires courts to draw between matters that are “substantive” (a concluso-ry term that means that state law will be used in cases where the rule of decision is derived from state law) and matters that are “procedural” (a similarly conclusory term that means the law of the forum will apply, and thus the same case will be handled differently depending on whether it is being pursued in a state court or a federal court). It is therefore useful to take a quick look at the development of the doctrine and the approach the current Supreme Court appears to be taking to this central issue of judicial federalism.
Erie itself presented a very broad question: whether, for purposes of the Rules of Decision Act, which was part of the First Judiciary Act (Act of Sept. 24, 1789, c. 34, 1 Stat. 92) and is now codified at 28 U.S.C. § 1652, federal courts sitting in diversity or otherwise applying state law as the rule of decision are obliged to follow only positive laws of the state as announced in statutes, or if the idea of “state law” also encompassed state decisional law. The Act itself, at the time Erie was decided, read simply:
The laws of the several states, except where the Constitution, treaties or statutes of the United States shall otherwise require or provide, shall be regarded as rules of decision in trials at common law in the courts of the United States in cases where they apply.
Erie,
Questions soon arose over the full reach of the Erie ruling, however, because in the very same year that Erie was decided, 1938, the Supreme Court promulgated the Federal Rules of Civil Procedure. The new rules replaced the old Conformity Act, which had been enacted in 1789 almost contemporaneously with the First Judiciary Act, see Process Act of 1789, Act of Sept. 29, 1789, c. 21, § 2, 1 Stat. 93. The Conformity Act provided that the procedure in actions at law in the federal courts was to be the same as the procedure used in the state in which the federal court sat. (Later, in 1842, the Supreme Court issued uniform federal rules for suits in equity, see 42 U.S. (1 How.) Lvi (first edition *1033 only), but those rules are not important for present purposes.) Had the Federal Rules not appeared at almost the same moment as the Erie decision, life would have been easy for federal courts: both state rules of procedure and the full body of state substantive law would have been applicable, and there would have been no need to worry about categorizing any particular law. But for a variety of reasons, Congress had passed the Rules Enabling Act, the successor to which can be found at 28 U.S.C. § 2072, in 1934. Act of June 19, 1934, c. 651, §§ 1, 2, 48 Stat. 1064. That Act empowered the Supreme Court to unify the systems of law and equity and to issue a single set of civil procedure rules to be used in the federal district courts. The rules that were developed under the authority of the Enabling Act were adopted by the Supreme Court on December 20, 1937, and took effect on September 1, 1938, less than five months after Erie was handed down. See generally 19 CHARLES Alan Wright, Arthur R. Miller & Edward H. Cooper, federal Practice & Procedure, § 4508 (2d ed.1996).
Eñe may have solved one problem, and the Rules Enabling Act may have solved another one, but in a small but significant set of cases they combined to create a new one. For cases involving obvious rules of substance {e.g., whether a person walking beside a railroad track is a “trespasser” or an “invitee” under state land law; whether a tort plaintiffs claim is defeated if she was eontributorily negligent, or if she loses only if her negligence was more than 50% responsible for the tort; whether the holder in due course rule applies to certain endorsers of commercial paper), it was easy for the federal courts to conclude that they were now to apply state law. (Ascertaining the content of state law poses its own problems, but we need not consider that aspect of Eñe here.) For cases involving obvious rules of procedure {e.g., which documents must be served formally and which must be filed with the court, see fed. R. Civ. P. 5; when is the earliest time a motion for summary judgment may be filed, see fed. R. Civ. P. 56(a), (b); what kinds of discovery devices are available, see fed. R. Civ. P. 26-37), federal courts knew that they were required to follow the Federal Rules, even if those rules were different from the rules applicable in state court. But there was a middle ground for rules that might be seen as “substantive,” or might be seen as “procedural,” and it was difficult both to define what those terms might mean, and to decide the box in which to put different rules.
The Court’s first effort to grapple with the middle ground came in
Guaranty Trust Co. v. York,
[Wjhether, when no recovery could be had in a State court because the action is barred by the statute of limitations, a federal court in equity can take cognizance of the suit because there is diversity of citizenship between the parties. Is the outlawry, according to State law, of a claim created by the States a matter of “substantive rights” to be respected by a federal court of equity when that court’s jurisdiction is dependent on the fact that there is a State-created right, or is such statute of “a mere remedial character,” ... which a federal court may disregard?
[Wjhether [the statute under review] concerns merely the manner and the means by which a right to recover, as recognized by the State, is enforced, or whether such statutory limitation is a matter of substance in the aspect that alone is relevant to our problem, namely, does it significantly affect the result of a litigation for a federal court to disregard a law of a State that would be controlling in an action upon the same claim by the same parties in a State court?
Id.
at 109,
Not long after
York
was decided, however, the Court came to realize that the outcome-determinative test swept too much under state law. As it observed in
Hanna v. Plumer,
every procedural variation is “outcome-determinative.” For example, having brought suit in a federal court, a plaintiff cannot then insist on the right to file subsequent pleadings in accord with the time limits applicable in state courts, even though enforcement of the federal timetable will, if he continues to insist that he must meet only the state time limit, result in determination of the controversy against him.
Id.
at 468-69,
Hanna
went further than this, however. It held that
Eñe
was never intended to cover cases where a federal rule of procedure covers the point at issue. In those cases, the proper questions are only (1) whether the rule clearly applies, (2) whether the rule falls within the scope of the Rules Enabling Act, and (3) whether the application of the rule would be constitutional. If the rule applies and is “rationally capable of classification” as procedural, see
The Supreme Court has revisited the
Eñe
issue many times since those early years, but it is enough for us to look at the Court’s two most recent decisions in order to complete our background review. We turn, then, to
Gasperini v. Center for Humanities, Inc.,
The Supreme Court took the case to decide whether, in a case where New York law governed the claims for relief, New York law also supplied the test for federal-court review of the size of the verdict.
What the Court did in the end was to find a middle ground. First, it decided that appellate review in the federal system of a trial judge’s denial of a motion to set aside a jury verdict as excessive was compatible with the Seventh Amendment.
Id.
at 436,
The
Semtek
decision also involved a delicate balancing of federal and state interests, but as in
Gasperini,
the Court ultimately affirmed the applicability of federal procedures. The question there was “whether the claim-preclusive effect of a federal judgment dismissing a diversity action on statute-of-limitations grounds is determined by the law of the State in which the federal court sits.”
Gasperini
represents an acknowledgment that some statutes have both substantive and procedural aspects. This court has also encountered this type of problem, in a line of cases that began with a suit in which an arcane rule of contract doctrine called “mend the hold” figured prominently.
Harbor Insur. Co. v. Continental Bank Corp.,
At that point, the insurance companies changed their story 180 degrees: they filed a defense to the counterclaim that took the position that Continental should not have settled the claims because the directors and officers had done nothing wrong at all. Under Illinois law, this attempted change in position ran afoul of the “mend the hold” doctrine, which is a common law rule that limits the right of a party to a contract suit to change positions.
Harbor Ins. Co.,
Next was
Herremans v. Carrera Designs, Inc.,
There is an exception for cases in which the application of the federal rule would interfere with substantial state interests, ... and the exception is more likely to be applicable when the state waiver rule is limited to some particular body of substantive law and is therefore more likely to reflect state substantive policies than is a procedural rule of general applicability.
Herremans,
Another in the same group was
Beul v. ASSE Int’l, Inc.,
Wisconsin’s affection for the special verdict is not limited to a particular area of law, which would suggest that it was motivated by a desire to shape substantive policy in that area.... Rules of general applicability and purely managerial character governing the jury, such as the form in which a civil jury is instructed, are quintessentially procedural for purposes of the Erie doctrine.
Id. (citations omitted). Federal law thus governed the propriety of the judge’s response, which the court then went on to find was a permissible one.
The problem before us is therefore, in light of the Erie doctrine as it has currently evolved, what to do with the two issues *1038 presented by this case, namely (1) does federal or state law govern the date on which an order is sufficiently final to trigger the provisions of § 115/14(b), and (2) if the answer to question (1) is state law, then is this a procedural rule that must yield to contrary federal law, or is it the kind of state law with enough of a substantive effect that it must be followed in federal court?
We consider first the question as of what date has the employer “been ordered by ... the [federal] court to pay wages due an employee.” It is no answer to this question to say that the IWPCÁ embodies a policy of prompt payment of wage claims, because the statute does not impose an obligation of payment on the employer until such an order is firmly in place. As we noted earlier, the Illinois courts regard the initial date of judgment as the operative date, even if a timely post-verdict motion is filed. See
Miller,
It seems possible to us, in light of the substantive policy Illinois has expressed in the IWPCA in favor of prompt payment of judgments for past wages and in keeping with Gaspenni’s approach, that state substantive interests and federal procedural rules might be capable of accommodation. This would require us to put together two aspects of Rule 62 as follows: first, the 15-day period provided by the IWPCA would begin to run on the date when execution on a federal judgment is first possible according to Rule 62(a) (the 11th day after the judgment); and second, the district court would be required in this special substantive area (along the lines identified in Harbor Insurance) to exercise its discretion under Rule 62(b) in favor of permitting immediate execution and leaving it to the parties to fight out on post-trial motions and on appeal the question whether or not the initial judgment was correct. If this could be done and was applied to our facts, then (as the district court held) Telular’s tender of payment to Houben on June 15 was timely: the judgment was entered on May 20; Rule 62(a) permitted execution no sooner than June 4 (the day after the expiration of the 10-day period to which the rule refers, according to the counting rule specified in Rule 6(a) that excluded weekends and holidays for time periods less than 11 days); and Telular paid on June 15,11 days later.
There are still problems with this accommodation, as we describe below, because it implies that state law deprives federal judges of discretion that has been conferred on them by valid federal rules. In addition, this approach assumes that the IWPCA is the kind of specialized state law to which we alluded in
Harbor Insurance, Hen'emans,
and
Beul,
but that is not the way the Illinois courts have treated it. To the contrary, the
Miller
decision described § 115/14(b) as a statute that was no different from the other Illinois post-
*1039
judgment interest statutes.
Miller,
If the possible accommodation we have outlined is too much of a strain, we must turn to more general principles to resolve this case. We know from
Hanna v. Plumer
that there is a gray area in which something might rationally be categorized as either procedural or substantive.
Hanna
directs federal courts to evaluate these areas carefully. The first step is to decide whether, when fairly construed, the scope of any federal rule or statute is broad enough either to cause a “direct collision” with the state law or otherwise “control[s] the issue” before the court.
Burlington N. R.R. Co. v. Woods,
We think it clear that the federal rule governing the date on which execution may issue upon a judgment (Rule 62) and the mechanisms that exist to ensure prompt payment of judgments are at least rationally capable of classification as procedural. In
DDI Seamless Cylinder Int’l, Inc. v. General Fire Extinguisher Corp.,
It is unusual, to say the least, for a judge to issue an order directing the payment of a judgment within ten days under threat of sanctions — there is no other way to describe the “liquidated damages” provision, which so far as appears bears no relation to any reasonable estimate of the cost to DDI of a one day’s delay in payment of the judgment — if the judgment is disobeyed. Indeed, in the usual case such an order would be clearly ultra vires. Not only is there no statutory authority for it; there is no room for an exercise of inherent judicial power. The ground is occupied by statutes and rules already. A plaintiff who obtains a money judgment is entitled to post-judgment interest, 28 U.S.C. § 1961, at an interest rate ... much lower than the implicit interest rate (43.8 percent per annum!) reflected in the “liquidated damages” provision imposed by the magistrate judge. And the collectability of a judgment is secured by the requirement that the defendant post a supersedeas bond if he wants to stave off execution pending appeal, fed.R.CivP. 62(d)-
If there is a conflict between Illinois law and federal law,
Hanna
obliges us to follow the federal rule under the circumstances we have here. Construed the way Houben urges us to see it, Illinois’ penalty provision conflicts with the two federal laws identified in
DDI:
28 U.S.C. § 1961 and fed. R. Civ. P. 62. As we noted there, Congress has enacted a post-judgment interest statute for use in the federal courts, which is found at 28 U.S.C. § 1961. That statute sets interest at a rate equal to the weekly average 1-year constant maturity Treasury yield. At the time of judgment, this was equivalent to 4.727% per year, a fraction of the 1% per day interest payment IWPCA mandates. Because Congress has already established a rule for interest in federal cases designed to ensure the prompt payment of judgments by recalcitrant defendants, the purposes underlying the statute are “sufficiently coextensive with the asserted purposes of the [Illinois] statute to indicate that [§ 1961] occupies the statute’s field of operation so as to preclude its application” here.
Burlington N. R.R.,
Furthermore, the Illinois statute as Houben wants it applied also directly collides with Rule 62 of the Federal Rules of Civil Procedure. As we have already noted, that rule imposes an automatic stay preventing execution of the judgment until the expiration of 10 days after entry of a judgment. That in itself may not be enough to create a direct collision, because it would still leave five days for payment after the grace period is over. But Rule 62(b) permits the district court to issue a further stay of execution during the pen-dency of a timely filed motion for new trial under Rule 59 or a motion for judgment as a matter of law under Rule 50. According to Houben, the Illinois statute withdraws that discretion from the federal judge. Finally, once an appeal is taken (which cannot occur until after the disposition of the Rule 50/59 motions), the court may continue the stay of execution if the appellant files a supersedeas bond during the pen-dency of any appeal, fed. R. Civ. P. 62(d). The IWPCA penalty provision gives the trial court none of the flexibility assured by Rule 62(b) and (d); the judgment must be paid or else the penalties (like the “liquidated damages” in
DDI)
automatically accrue.
Cf. Burlington N. R.R.,
Ill
Because IWPCA § 115/14(b) is, for purposes of the Erie doctrine, either capable of accommodation on these facts with the federal rules governing the date on which execution may begin on a federal judgment, or if not, is in direct conflict with valid federal rules of procedure, we conclude that the district court was correct to *1041 deny Houben additional penalties. Its judgment is therefore Affirmed.
