The Michigan Research and Development Tax Credit: A Comprehensive Guide to Flow-Through Entity Mechanics and Treasury Guidance

In the context of the Michigan Research and Development (R&D) tax credit, a Flow-Through Entity (FTE) is a business structure—such as an S-corporation, partnership, or limited liability company—that serves as the primary claimant of the credit against its employer withholding tax liabilities. Unlike federal tax credits that typically pass through to individual owners, this state-level incentive remains at the entity level to directly offset the costs of maintaining a research-intensive workforce within the state.1

The reintroduction of a dedicated R&D tax credit in Michigan represents a strategic shift in the state’s economic development policy, intended to foster innovation and high-tech job growth. Enacted via Public Acts 186 and 187 of 2024, the legislation establishes a refundable credit for tax years beginning on or after January 1, 2025.3 For flow-through entities, which comprise a significant portion of Michigan’s startup and mid-market manufacturing sectors, the credit offers a crucial mechanism for liquidity. This is especially pertinent given Michigan’s recent legislative decision to decouple from federal Section 174 expense treatment, which now requires the capitalization and five-year amortization of domestic research expenditures for state purposes.3 By providing a refundable credit that can be applied against withholding taxes, the state effectively “returns” a portion of the tax capture associated with high-wage research roles back to the innovating business.1

Legislative Foundation and Historical Context

The current Michigan R&D credit framework is the result of a bipartisan effort to restore incentives that were sunset over a decade ago. Historically, Michigan incentivized research through the Single Business Tax (SBT), which served as the state’s primary business tax from 1976 until its repeal in 2007.4 Following the repeal of the SBT, the state transitioned through various tax regimes, including the Michigan Business Tax (MBT) and the eventual shift to the Corporate Income Tax (CIT) for C-corporations, while flow-through entities became largely subject to individual income tax through their members.4

Public Act 186 (House Bill 5100) and Public Act 187 (House Bill 5101) of 2024 successfully amended the Income Tax Act of 1967 to create Sections 677 and 717, respectively.3 These sections establish the legal basis for both corporate and flow-through taxpayers to claim credits based on “qualifying research and development expenses” (QREs) incurred within the state’s borders.3 The legislative intent, as outlined in fiscal impact reports, is to reduce the state’s revenue by approximately $100 million per year to stimulate private sector investment in the General Fund and School Aid Fund sectors.11

Defining the Flow-Through Entity in Michigan Law

For the purposes of this credit, the definition of a flow-through entity is rigorous and tied to specific withholding requirements. According to Michigan Compiled Law (MCL) 206.701(d), a flow-through entity is an entity that, for the applicable tax year, is treated as an S-corporation under IRC § 1362(a), a general partnership, a limited partnership, a limited liability partnership, or a limited liability company (LLC) that is not taxed as a corporation for federal income tax purposes.1

Mandatory Requirements for FTE Claimants

To be eligible for the credit, an FTE must satisfy three primary conditions established by the Department of Treasury:

1. The entity must be an employer subject to Michigan income tax withholding on its employees.1
2. The entity must not be subject to the Corporate Income Tax (CIT) or the Michigan Business Tax (MBT).1
3. The entity must have incurred qualifying research and development expenses that exceed a Michigan-specific base amount.3

Disregarded Entities and Exclusions

A nuanced point in the Treasury guidance involves disregarded entities. Under MCL 206.699, entities that are disregarded for federal tax purposes—such as single-member LLCs (SMLLCs) that have not elected to be taxed as corporations—are generally not considered “flow-through entities” in their own right for this credit.1 In such cases, the R&D activities are typically attributed to the owner of the disregarded entity. If the owner is a corporation, the claim is filed under the CIT rules; if the owner is an individual, the framework for claiming the credit is still being finalized in supplemental Treasury instructions.1

The Non-Pass-Through Prohibition: A Unique Michigan Mechanism

The most significant departure from traditional flow-through taxation is Michigan’s “no pass-through” rule. In almost every other state and federal context, R&D credits flow through the entity to the owners’ personal tax returns. However, the Michigan Department of Treasury has explicitly clarified that for the R&D credit, a member of a flow-through entity that submits a claim is prohibited from claiming any portion of that credit themselves.1

This mechanism effectively decouples the R&D incentive from the owners’ income tax liability and attaches it to the entity’s payroll tax liability. The logic behind this shift is centered on the “withholding tax capture” model.9 By allowing the business to retain the credit and apply it against the taxes it withholds from employee paychecks, Michigan ensures that the incentive stays with the operational business unit where the R&D is actually taking place.1 This prevents the dilution of the credit’s impact that can occur when owners reside out-of-state or have disparate tax situations.

Quantitative Analysis: Calculating the Credit

The calculation of the Michigan R&D credit is a two-pronged process that rewards incremental increases in research spending. It uses the federal IRC Section 41(b) definition for “qualified research expenses” (QREs) but applies a Michigan-specific “base amount” and tiered rates based on the size of the workforce.3

Defining Michigan Qualified Research Expenses (MQREs)

To qualify, the research must be conducted entirely within the state of Michigan.3 Expenses for research conducted outside the state are strictly excluded.1 MQREs typically include:

• Wages: Payments to employees directly performing, supporting, or supervising research.3
• Supplies: Prototypes, raw materials, and other consumables used in experimentation.3
• Computer Costs: Rentals for off-site or cloud-based server space used for design or software testing.3
• Contract Research: A portion (usually 65%) of payments to third-party vendors for research conducted in Michigan.5

The Base Amount Formula

The base amount is the average annual amount of qualifying R&D expenses incurred during the three calendar years immediately preceding the calendar year ending with or within the tax year for which the credit is claimed.1 For the initial 2025 credit, the base period consists of calendar years 2022, 2023, and 2024.5

If a business did not exist or did not have R&D expenses in all three years, the following rules apply:

• If the business existed for the full period but had no R&D, the base amount is zero ($0$).5
• If expenses were incurred in only one or two years, the average is based only on those years (e.g., total expenses divided by 1 or 2).5
• Short taxable years are treated as full years, with no annualization required.8

Tiered Credit Rates and Individual Caps

The state differentiates between “Small” and “Large” taxpayers based on an employee count of 250.3 An employee is defined per IRC Section 3401(c) as anyone from whom the employer is required to withhold federal income tax.2

If the unadjusted credit amount for a small taxpayer is $X$, the formula is:

$$Credit = (Base \times 0.03) + ((MQRE – Base) \times 0.15)$$

Subject to the $250,000 cap.3

The University Collaboration Bonus

To incentivize partnerships between the private sector and academia, Michigan allows for an additional credit of 5% on expenses incurred in collaboration with a Michigan research university.3 This bonus is applicable to the portion of the expenses tied to a written agreement with a public university or an independent nonprofit college within the state.3

This additional credit is capped at $200,000 per year per taxpayer.3 For an FTE to claim this, they must be prepared to submit a copy of the formal agreement to the Treasury.16 Importantly, this bonus is calculated on the portion of MQREs that exceed the base amount, effectively increasing the “Excess” rate for collaborative research to 20% for small businesses and 15% for large businesses.4

Statewide Caps and the Proration Mechanism

To ensure fiscal stability, the aggregate amount of credits allowed to be claimed by all taxpayers (CIT and FTE combined) is capped at $100 million per calendar year.4 To manage this cap, Michigan has implemented a complex proration system that prioritizes small businesses.

Allocation of the $100 Million Pool

The cap is divided into two primary allotments:

1. Small Business Reserve: $25 million is reserved specifically for claimants with fewer than 250 employees.3
2. Large Business Allotment: $75 million is available for larger claimants.3

Proration Scenarios

The Treasury Department will determine the total volume of “tentative claims” submitted by the deadline. If the total claims in a category exceed the allotment, the following proration rules apply 3:

• Scenario A: Small business claims are $\leq$ $25 million. Small businesses receive 100% of their claim. The remaining portion of the $100 million is available to large businesses. If large business claims exceed that remaining amount, they are prorated.3
• Scenario B: Small business claims are $>$ $25 million. Small business claims are prorated to fit within $25 million. Large business claims are prorated to fit within $75 million.3
• Scenario C: Small business claims exceed 25% of the total statewide claims (both large and small). In this instance, all claims are pooled and prorated against the full $100 million.3

Treasury intends to publish a general proration notice on its website by April 30 each year to inform taxpayers of the “adjustment factor” they must apply to their final returns.2

Decoupling from IRC Section 174: Strategic Implications

A vital context for the Michigan R&D credit is the state’s recent tax conformity legislation. On October 7, 2025, Michigan enacted House Bill 4961, which updated the state’s Internal Revenue Code conformity date but explicitly decoupled from the federal treatment of research and experimental (R&E) expenses.3

The Amortization Burden

While the federal “One Big Beautiful Bill” restored immediate expensing for domestic R&D costs at the federal level for 2025, Michigan continues to require these costs to be capitalized and amortized over five years for state tax purposes.3 This creates a “tax gap” where a business might have a federal deduction for 100% of its research costs but only a 10% or 20% deduction (depending on the mid-year convention) for Michigan purposes in the year the expense is incurred.3

The refundable R&D tax credit serves as the state’s primary tool to offset this increased tax burden. For many flow-through entities, the cash refund provided by the credit will be essential to maintain the liquidity necessary to fund ongoing innovation despite the delayed tax deduction.3

Local State Revenue Office Guidance and Claim Procedures

The Michigan Department of Treasury has provided specific procedural instructions for flow-through entities, which differ significantly from those for corporate taxpayers. The process is a multi-step cycle involving tentative claims, proration reviews, and final return filing.2

The Tentative Claim (The Application)

To be eligible for a credit based on 2025 expenses, all claimants must submit a tentative claim through Michigan Treasury Online (MTO) no later than April 1, 2026.1 For subsequent years, the deadline moves to March 15.1

The tentative claim must include:

• The total MQREs incurred during the calendar year.10
• The unadjusted credit amount based on the 3%/10% or 3%/15% formulas.1
• Specific details regarding university collaborations.3
• The number of employees to determine taxpayer size.10

Treasury has stated that tentative claims must be based on actual, not estimated, expenses. Claims submitted after the statutory deadline will not be accepted, and no credit will be awarded for that year.2

Periodic Withholding Reductions

One of the most favorable reliefs for FTEs is the ability to reduce periodic withholding payments before the annual return is filed. Once Treasury publishes the tentative claim adjustment (proration) notice—anticipated by April 30—the FTE may begin to reduce its 2026 periodic withholding payments to reflect the credit earned from 2025 expenses.1 This provides almost immediate cash flow benefits.

Filing the Annual Return

The final step is to report the credit on the business’s annual withholding return (typically Form 5081).3 For flow-through entities, the credit is claimed on the return for the tax year in which the tentative claim was filed.1

Comprehensive Example: The “Mid-Michigan Biotech” Case Study

To illustrate the interplay of these rules, consider “Mid-Michigan Biotech,” an S-corporation with 120 employees. In 2025, they increased their research footprint in East Lansing, collaborating with Michigan State University (MSU).

The Data:

• 2025 MQREs: $1,200,000 (of which $400,000 was for collaborative work with MSU).
• Base Period MQREs (Avg. 2022-2024): $600,000.
• Employee Count: 120 (Small Taxpayer).

Step 1: Calculate the Standard Credit

• MQREs up to base ($600,000) at 3%: $18,000.
• MQREs above base ($600,000) at 15%: $90,000.
• Subtotal: $108,000.

Step 2: Calculate the University Bonus

• Collaborative MQREs above base ($400,000) at 5%: $20,000.
• Total Unadjusted Credit: $108,000 + $20,000 = $128,000.

Step 3: Apply the Proration

The company files a tentative claim for $128,000 by April 1, 2026. Treasury determines that the small business pool is oversubscribed and sets a proration factor of 0.85 (85%).

• Adjusted Credit: $128,000 \times 0.85 = $108,800.

Step 4: Implementation

Mid-Michigan Biotech’s 2026 withholding liability is $150,000. They have already paid $50,000 in Q1 2026. Upon receiving the proration notice in late April, they stop making periodic payments for the remainder of 2026 because their adjusted credit ($108,800) covers the remaining liability. When they file Form 5081 in February 2027, they report the full $108,800 credit, resulting in a refund of any overpaid withholding from earlier in the year.1

Comparative Analysis: Michigan vs. Neighboring States

Michigan’s R&D credit is positioned competitively against other Midwestern states, though its administrative structure is unique.

• Wisconsin: Offers a credit of up to 5.75% of qualified expenses that exceed 50% of the three-year average. The rate doubles for specific energy and battery-related research.18
• Indiana: Uses a 15% rate for the first $1 million of expenses over a base amount and 10% thereafter. Indiana’s base amount is identical to the federal formula.18
• Illinois: Offers a non-refundable credit, though excess amounts can be carried forward for five years.18

Michigan’s advantage lies in its refundability and the high 15% rate for small businesses on incremental expenses, which is significantly higher than Wisconsin’s and matches Indiana’s top tier.5 However, Michigan’s $100 million aggregate cap introduces a level of uncertainty not present in Illinois or Indiana.18

Audit Readiness and Documentation Standards

The Michigan Department of Treasury is expected to be vigilant in auditing R&D claims, particularly given the newness of the credit and the requirement for proration. Flow-through entities must maintain contemporaneous records that meet federal “Four-Part Test” standards while specifically proving Michigan nexus.5

Required documentation for an audit includes:

1. Project Descriptions: Narrative evidence showing that the research was aimed at a new or improved function and involved a process of experimentation.3
2. Payroll Allocation: Detailed logs or time-tracking data that link employee wages to specific projects conducted in Michigan.3
3. Supply Invoices: Documentation showing that supplies were consumed in the research process within the state.3
4. University Agreements: Executed contracts for collaboration bonuses, clearly defining the roles of the university and the business.16

Records must generally be kept for at least four years after the date the return was filed or the credit was claimed.5

Conclusion: Strategic Outlook for Michigan FTEs

The reintroduction of the Michigan R&D tax credit is a landmark event for the state’s innovation sector. For flow-through entities, the credit represents a paradigm shift in how tax incentives are realized—moving from the individual K-1 to the entity-level withholding return. This structure provides a direct and efficient way to lower the cost of labor for research-heavy firms, effectively subsidizing the state’s talent pool.3

However, the “first-come, first-served” nature of the tentative claim deadlines and the looming risk of proration mean that businesses cannot afford a “wait and see” approach. Companies should immediately begin retroactively calculating their 2022-2024 Michigan R&D expenses to establish an accurate base amount and modify their internal accounting systems to track 2025 expenses in real-time. By aligning their research strategies with the state’s collaborative and small-business incentives, Michigan’s flow-through entities can significantly mitigate the costs of innovation and position themselves at the forefront of the state’s technological renaissance.3

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