Oshkosh Truck Corporation v. Wisconsin Department of Revenue

Oshkosh Truck Corporation received a July 2001 assessment from the Wisconsin Department of Revenue for additional franchise tax for the 1996 and 1997 tax years. After the Department granted its petition for redetermination only in part, Oshkosh appealed to the Tax Appeals Commission and later amended its petition to claim, for the first time, an offset against the assessment based on qualified research expenditure credits for 1996 and 1997 under Wis. Stat. section 71.28(4) — even though the four-year statute of limitations for claiming those credits under sections 71.28(4)(h) and 71.75(2) had already lapsed. The Department moved to dismiss the equitable recoupment claim, arguing the doctrine did not apply.

The 'Same Transaction' Test

The Commission explained that equitable recoupment is a judicially created exception to statutes of limitations barring stale tax claims, tracing to Bull v. United States, 295 U.S. 247 (1935), and adopted in Wisconsin through American Motors Corp. v. Department of Revenue, 64 Wis. 2d 337 (1974). Under the 'same transaction' test, either the State or a taxpayer may assert an otherwise time-barred claim as an offset, so long as it arises from 'the same year or income tax period' as the claim or assessment it is offsetting. Because the Department's assessment and Oshkosh's unclaimed research credits both related to the identical 1996 and 1997 tax years, the Commission held the same-transaction requirement was satisfied.

The Research Credit's Own Statute of Limitations Did Not Bar the Doctrine

The Department argued that Wis. Stat. section 71.28(4)(h) — which conditions the research credit on a timely claim under the general four-year refund limitations period — reflected a specific legislative intent to foreclose equitable recoupment for research credits. The Commission disagreed, holding that section 71.28(4)(h) is simply an ordinary statute of limitations with no language distinguishing it from other tax provisions subject to the recoupment doctrine, and that Oshkosh's lack of due diligence in originally claiming the credits did not constitute 'unclean hands' barring equitable relief, since Oshkosh's inaction was not wrongful conduct that caused the harm from which it now sought relief.

The Commission denied the Department's motion to dismiss, allowing Oshkosh to proceed with its equitable recoupment claim, capped at the amount of the Department's own assessment for the same years.

Significance: This decision established Wisconsin's controlling equitable recoupment framework for the state's research credit, later distinguished in The C.A. Lawton Co. v. Wisconsin Department of Revenue, where the Commission rejected an equitable recoupment argument precisely because the taxpayer's stale research credits and the assessment at issue involved different tax years.