Michigan Treasury has issued the R&D tax credit proration notice, providing both large and small taxpayers with the information needed to calculate and file with their allocated credit amount. This milestone moves the credit from the application phase to final calculation and filing; an important transition period for taxpayers looking to capitalize on the ultimate benefit of the credit.
As outlined in our earlier overview of Michigan’s reinstated R&D tax credit, the program is subject to an annual statewide cap of $100 million. When taxpayers submit tentative claims exceeding that cap, Treasury is required to prorate credits across all eligible claimants. Taxpayers then apply the proration amount to the tentative credit applied for, resulting in the final credit amount that will be claimed on their annual tax filing.
The final proration amounts, as published by Michigan Treasury are 59.88% for small taxpayers and 50.96% for large taxpayers.
What does the Michigan R&D tax credit proration results mean?
The proration notice reflects Treasury’s final allocation of the credit based on statewide claim activity. As these results indicate, total statewide claims across both small and large taxpayers exceeded the $100 million statutory cap. As a result, the amount of credit each taxpayer is allowed to claim will be lower than the original tentative claim they applied for.
The prorated amount now serves as the authoritative credit figure allowable for Michigan income tax return filings, or where applicable, for employment withholding tax offsets. Taxpayers must apply the applicable proration percentage to their tentative claim amount, even if the taxpayer later determines that its tentative claim was understated. Conversely, if a taxpayer determines that its tentative claim was overstated, the proration percentage must be applied to the corrected, lower tentative claim amount.
Michigan R&D tax credit filing requirements vary by entity type
How the allocated credit is ultimately claimed depends on the taxpayer’s entity type:
- C corporations will claim the approved R&D credit directly on their Michigan Corporate Income Tax (CIT) return. With extended filing, Michigan CIT returns are generally due October 15, giving taxpayers time to incorporate the finalized credit amount into their return.
- Flow-through entities, such as partnerships and S Corporations, claim the refundable credit through a different mechanism that offsets Michigan employee withholding taxes. There are two paths flow-through entities can take to monetize the credit:
- Annual filing option. The credit may be reported on the Michigan Annual Sales, Use, and Withholding (SUW) Tax Return, due Feb. 28, 2027. The credit is refundable to the extent it exceeds employment tax liabilities.
- Quarterly payroll withholding option. Alternatively, taxpayers may begin applying the credit against their Michigan payroll withholding deposits on a quarterly basis to accelerate recovery of the credit. Reconciliation is then performed when filing the annual SUW return, and any unused credit will be refunded.
From a compliance perspective, annual filing is the less complex option and leaves little room for error. However, the payroll withholding option may be appealing for taxpayers hoping to receive a more immediate cash flow benefit. Taxpayers choosing to offset quarterly withholding deposits are still required to claim the adjusted credit on the annual SUW return, and any overpayment remaining will be refunded. Taxpayers should be aware that penalties and interest will apply if quarterly withholding deposits are reduced beyond the adjusted credit amount. Careful coordination with payroll providers will be an important step for this process.
What should taxpayers do next?
With final allocations in hand, taxpayers should focus on execution:
- Coordinate with payroll tax providers if the credit will be utilized through offsets against quarterly withholding deposits.
- Reconcile filings and documentation to ensure the allocated credit amount ties back to the original tentative claim and is adequately supported with documentation in the event of future examination by the state.
What to expect for future Michigan R&D tax credit filings
While the proration results will require taxpayers to reduce their tentative credit claims by nearly half, the Michigan credit still represents a meaningful incentive for businesses investing in innovation. Looking forward, taxpayers should be mindful that the tentative claim application deadline moves up to March 15 starting in 2027 (from April 1). This accelerated timeline will require taxpayers to finalize qualified research expenses, credit calculations, and supporting documentation earlier in the year. Businesses that begin the process sooner will be better positioned to meet the shortened deadline and avoid unnecessary execution risk.
