The Small Business Designation within the Michigan Research and Development Tax Credit Framework

The “Small Business” designation under the Michigan R&D tax credit refers to authorized businesses with fewer than 250 employees. This status grants access to a higher 15% credit rate on qualifying research expenses exceeding a calculated base amount, subject to a $250,000 annual cap.1

The reintroduction of a state-level Research and Development (R&D) tax credit in Michigan via Public Acts 186 and 187 of 2024 represents a pivotal shift in the state’s economic development strategy.1 Effective for tax years beginning on or after January 1, 2025, this legislative package targets the stimulation of domestic innovation by providing a refundable credit against the Corporate Income Tax (CIT) and withholding taxes for certain flow-through entities (FTEs).2 At the heart of this legislation is a bifurcated system that distinguishes between “small” and “large” businesses based on a threshold of 250 employees.1 This distinction is not merely semantic; it dictates the fundamental calculation of the credit, the maximum benefit available to the taxpayer, and the specific protections afforded to the claimant within a statewide funding cap.3 For small businesses, the credit offers a more aggressive incentive structure to compensate for the higher relative risks and capital constraints inherent in early-stage and mid-market innovation.1

Legislative Context and Economic Objectives

The passage of House Bills 5100 and 5101, which became Public Acts 186 and 187, respectively, marked the culmination of a multi-year effort to restore Michigan’s competitiveness in the high-tech sector.5 Prior to this enactment, Michigan had been without a dedicated R&D tax credit since the repeal of the Michigan Business Tax (MBT) for most filers in 2011.5 During this decade-long gap, Michigan was one of only a handful of industrialized states without a dedicated tax incentive for research, potentially disadvantaging local manufacturers and technology firms.2 The current legislation aims to align Michigan with 36 other states that leverage R&D credits to attract talent and investment.7

The legislative intent behind the 250-employee threshold is rooted in a desire to foster a “bottom-up” innovation ecosystem.7 By providing a higher credit rate for smaller firms, the state acknowledges that startups and small manufacturers often face greater hurdles in financing long-term research projects.1 The Small Business Association of Michigan (SBAM) was a key advocate for these changes, pushing for a credit that was industry-agnostic and accessible through the standard tax system rather than a discretionary grant process.11 This shift ensures that innovation is rewarded wherever it occurs—whether in a basement software lab in Ann Arbor or a small tool-and-die shop in Grand Rapids—rather than being limited to businesses with established political connections or sophisticated government relations departments.11

Core Legal Definitions and Scope

The legislation defines an “authorized business” as any taxpayer or employer that is a corporation, insurance company, financial institution, or a flow-through entity that has increased its qualifying research and development expenses in a calendar year.4

Statutory Provision	Target Taxpayer Group	Primary Legal Citation
Public Act 186 of 2024	Corporate Income Tax (CIT) Payers	MCL 206.677 7
Public Act 187 of 2024	Flow-Through Entities (Withholding)	MCL 206.716 7

The credit applies only to “qualified research” conducted within the borders of Michigan.1 This geographical restriction is a cornerstone of the policy, ensuring that the state’s tax revenue is used to incentivize local job creation and infrastructure development.3

The 250-Employee Threshold: Counting and Aggregation

The determination of whether a business falls under the 250-employee threshold is the most critical preliminary step in calculating the credit.1 While seemingly straightforward, the Michigan Department of Treasury has provided specific nuances regarding how this headcount is determined, particularly for complex corporate structures.15

Methodology for Headcount Determination

The employee count is based on the total number of individuals employed by the authorized business during the calendar year ending with or within the tax year for which the credit is claimed.8 Treasury guidance indicates that this is a “headcount” measure rather than a “full-time equivalent” (FTE) measure.15 This means that every individual on the payroll, regardless of their status as full-time, part-time, or seasonal, generally counts as one employee toward the 250-limit.15

For businesses that fluctuate in size throughout the year, the Treasury is expected to clarify whether the threshold is met if the count exceeds 250 at any point in the year or if an average is taken.15 However, current guidance emphasizes the importance of accurate payroll records for the entire “expense year”—the calendar year in which the MQREs were incurred.12

Unitary Business Group (UBG) Aggregation Rules

A significant administrative hurdle for mid-sized firms is the aggregation rule for Unitary Business Groups.2 Under the Michigan Corporate Income Tax, a UBG is treated as a single taxpayer.4 Consequently, the 250-employee threshold is applied at the group level.2

If a parent company and its three subsidiaries each have 70 employees, the total employee count for the UBG is 280.2 In this scenario, the entire group is classified as a “large business,” even though each individual legal entity has fewer than 250 employees.2 This preventatively addresses tax planning strategies that might attempt to fracture a single enterprise into multiple smaller entities to claim the 15% small business rate or to bypass the $250,000 individual cap.15

Eligibility for Flow-Through Entities (FTEs)

For flow-through entities (S corporations, partnerships, and LLCs treated as partnerships), the employee count must be carefully monitored to ensure they meet the definition of an “authorized business” under PA 187.4 An FTE is eligible if it is an employer subject to Michigan income tax withholding.4 If an FTE has fewer than 250 employees, it calculates its credit using the small business rates, but it must claim the credit at the entity level against its withholding tax obligations.2

Importantly, disregarded entities and entities taxed as C corporations for federal purposes are handled differently.2 A single-member LLC that is disregarded for federal tax purposes cannot claim the credit independently; instead, the activity is attributed to its owner.2

The Tiered Credit Structure: Small vs. Large Businesses

Michigan’s R&D credit is intentionally tilted toward small businesses, providing a 50% higher marginal credit rate for research spending that exceeds the historical baseline.1

Comparative Credit Rate Analysis

Both small and large businesses are eligible for a 3% credit on their Michigan Qualified Research Expenses (MQREs) up to their base amount.1 The divergence occurs when spending exceeds that base amount:

Business Size	Credit Rate (Up to Base)	Credit Rate (Above Base)	Annual Maximum Credit
Small (< 250 Employees)	3%	15%	$250,000 1
Large (≥ 250 Employees)	3%	10%	$2,000,000 1

The rationale for the 15% rate for small businesses is to provide a “supercharged” incentive for growth-phase companies.1 For a startup that has historically spent $100,000 annually on R&D but increases that to $200,000 in 2025, the 15% credit on the additional $100,000 provides a substantial cash injection that can be immediately reinvested into further scaling.1

The Annual Statewide Cap and Reserve System

The state has allocated a total of $100 million annually for the R&D tax credit program.1 To protect small businesses from having the entire fund exhausted by a few massive automotive or pharmaceutical giants, the legislation includes a specific reserve:

• Small Business Reserve: $25,000,000 is set aside exclusively for businesses with fewer than 250 employees.2
• Large Business Allocation: $75,000,000 is generally allocated to businesses with 250 or more employees.3

This reservation system ensures that small businesses have a guaranteed pool of capital.10 If large businesses submit $150 million in tentative claims, they will be prorated down to the $75 million cap.6 However, if small businesses only submit $20 million in claims, their credits will be paid in full (assuming no other limitations apply), as they are within their $25 million reserve.6

Base Amount Calculation and Calendarization

Calculating the “base amount” is the foundation of the incremental credit model.1 The base amount represents the business’s “business as usual” research spending, against which the current year’s innovation is measured.1

The Rolling Three-Year Average

For any given tax year, the base amount is defined as the average annual amount of qualifying research and development 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

The formula for the base amount (B) for a claim in year (Y) is:

$$B = \frac{\sum_{i=1}^{3} MQRE_{Y-i}}{3}$$

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Nuances in the Calculation

• Newer Businesses: If a business has been in existence for less than three years, the average is based only on the years it incurred qualifying R&D expenses.2
• First-Time R&D: If a business has never incurred qualifying R&D expenses in Michigan, the base amount is zero.2
• Short Taxable Years: The Treasury has specified that short taxable years are treated as full years, and no annualization of expenses is required when calculating the base amount.2

Calendar-Year Basis vs. Fiscal-Year Reporting

A distinctive and technically challenging feature of the Michigan R&D credit is its strict adherence to a calendar-year basis (January 1 to December 31) for calculating MQREs, regardless of the taxpayer’s fiscal year-end.4

This requirement means that a company with a fiscal year from July 1 to June 30 must extract and “calendarize” its R&D data to report expenses for the Jan–Dec period.15 This ensures that all businesses—large and small—are measured against the same 12-month cycle for the purposes of the $100 million statewide cap.4 For the base years (2022–2024), the Treasury has indicated it will provide an optional method for fiscal-year filers to convert their data to a calendar-year format to ease the transition.4

Revenue Office Guidance: The Administrative Workflow

The Michigan Department of Treasury has released preliminary notices to guide businesses through the first year of the credit.4 The process involves three distinct phases: the tentative claim, the proration adjustment, and the final tax return filing.2

Phase 1: The Tentative Claim

To manage the $100 million cap, the state requires a preliminary application known as a “tentative claim”.2 This is not a tax return; rather, it is a notification to the Treasury of the taxpayer’s intent to claim the credit and the amount of expenses incurred.3

• Platform: All claims must be submitted electronically via Michigan Treasury Online (MTO).2
• Deadline for 2025 Expenses: For expenses incurred between January 1, 2025, and December 31, 2025, the tentative claim must be filed no later than April 1, 2026.2
• Future Deadlines: For subsequent years, the deadline moves to March 15.2

Businesses must use actual expenses in the tentative claim, not estimates.2 If the tentative claim is late or omitted, the taxpayer loses the ability to claim the credit for that year.15

Phase 2: Proration and Adjusted Credit Notice

After the April 1 deadline, the Treasury aggregates all claims.1 If the total exceeds $100 million, the department applies the proration percentages based on the small and large business pools.6

1. Notification: The Treasury expects to publish the proration percentages and notify taxpayers of their “adjusted credit” by April 30.6
2. Calculation of Adjusted Credit: The taxpayer takes their “unadjusted credit” from the tentative claim and multiplies it by the state-provided proration factor.20
3. Public Transparency: While individual taxpayer data is confidential, the Treasury will publish a report for the legislature including the names of all authorized businesses that submitted claims and the total amount allowed.8

Phase 3: Final Claim on the Annual Return

The third phase is the actual reporting of the credit on the business’s annual tax return.6

• For CIT Filers: The credit is reported on the annual Corporate Income Tax return.2
• For FTE Withholding Filers: The credit is reported on the annual withholding return, which is typically due by February 28 of the second calendar year following the expense year.19

Refundability: A Liquidity Lifeline for Small Businesses

Perhaps the most powerful feature of the Michigan R&D credit—particularly for small businesses—is that it is fully refundable.1

Mechanism of Refundability

In the tax world, many credits are “non-refundable,” meaning they can reduce a company’s tax bill to zero but cannot result in a check from the government.1 However, if the Michigan R&D credit exceeds the taxpayer’s total liability for the year, the state must refund the difference to the taxpayer.1

This is especially critical for early-stage tech companies and manufacturing startups that are in “growth mode” and may not yet have a positive tax liability.1 For these firms, the R&D credit acts effectively like a cash grant, providing immediate capital to:

• Hire skilled researchers and engineers.1
• Acquire specialized manufacturing or testing equipment.1
• Expand prototyping and pilot programs.1

Periodic Offsetting for Withholding Tax Filers

For flow-through entities with fewer than 250 employees, the Treasury has provided an optional “offset” mechanism to speed up access to these funds.15 Once the proration notice is published in April, an eligible withholding tax filer can reduce its subsequent monthly or quarterly withholding payments by the amount of its adjusted credit.15 This provides near-immediate cash flow benefits rather than requiring the business to wait until the annual return is filed.15

University Collaboration Bonus: Synergies and Caps

The Michigan R&D credit also incentivizes partnerships between the private sector and the state’s academic institutions through a “University Collaboration Bonus”.1

Qualification and Rates

Businesses that engage in qualified research in collaboration with a Michigan research university can claim an additional 5% credit on the portion of their MQREs tied to that partnership.1

• Formal Agreement Required: There must be a written agreement between the business and the university specifically detailing the collaboration.3
• Bonus Cap: This additional credit is capped at $200,000 per year per taxpayer.1
• Total Limit: Even with this bonus, the total credit claimed by a small business cannot exceed the $250,000 annual per-taxpayer cap.6

For a small business, this effectively means that if they are already hitting the $250,000 cap through their standard research, the university bonus will not provide additional cash.6 However, for businesses spending less on research, the bonus provides a significant 33% increase (from 15% to 20%) in the credit rate for the “excess” portion of collaborative spending.9

Qualified Research Expenses (MQREs) under Michigan Law

Michigan’s definition of qualified expenses is largely synonymous with the federal definition under IRC Section 41(b), but with a strict “Michigan-only” requirement.1

The Three Pillars of Research Spending

To be included in the MQRE total, an expense must fall into one of three categories and be incurred for research physically conducted in Michigan 3:

1. Wages: Salaries and wages paid to employees who are directly performing, supervising, or supporting research activities within the state.3
2. Supplies: The cost of materials and supplies consumed in the research process, such as prototype parts, chemical reagents, or testing materials.3
3. Contract Research: 65% of the amounts paid to third-party vendors (contractors, lab testers, engineers) for research performed on the taxpayer’s behalf in Michigan.3

Excluded Activities

It is equally important for small businesses to understand what does not qualify.23 Following federal guidelines, Michigan excludes 23:

• Research conducted after commercial production has begun.23
• Adaptation of an existing business component.23
• Reverse engineering of an existing product.23
• Market research, sales promotion, or routine quality control.23
• Research in the social sciences, humanities, or arts.23

For software developers, research related to internal-use software must meet a higher “innovation” threshold to qualify, a nuance that often impacts small tech startups.3

Decoupling from Federal Section 174: The Policy Context

One of the most pressing reasons Michigan reintroduced this credit was to mitigate the impact of the federal “amortization” mandate for R&D expenses.2

Federal Amortization vs. State Conformity

Historically, businesses could “expense” R&D costs immediately, deducting 100% of the cost in the year it was incurred.1 However, starting in 2022, federal law (IRC Section 174) began requiring businesses to capitalize these costs and amortize them over 5 years for domestic research (15 years for foreign).2

While federal legislation has attempted to revert to immediate expensing, Michigan passed House Bill 4961 in late 2025, which explicitly decoupled the state’s tax code from these federal changes.2 Consequently, for Michigan tax purposes, businesses must still amortize their R&D costs over five years.2

The new R&D tax credit serves as a vital counterweight to this amortization requirement.3 Since businesses cannot deduct the full cost of R&D on their Michigan return immediately, the refundable credit provides the direct cash relief necessary to restore the liquidity that was lost through the amortization mandate.3

Detailed Practical Example: InnovateMI LLC

To illustrate the interplay between business size, the base amount, and the credit rates, consider the following scenario for a fictional Michigan small business.1

The Profile: InnovateMI LLC

• Employee Count: 45 (Classified as a “Small Business” because < 250).1
• Tax Year: 2025 Calendar Year.19
• Entity Type: S Corporation (Flow-through entity subject to withholding).2

Step 1: Historical Data (2022–2024)

InnovateMI must determine its historical MQREs to calculate its base amount.4

• 2022 MQRE: $150,000
• 2023 MQRE: $250,000
• 2024 MQRE: $350,000

Calculation of Base Amount (B):

$$B = \frac{\$150,000 + \$250,000 + \$350,000}{3} = \$250,000$$

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Step 2: Current Year Activity (2025)

In 2025, InnovateMI significantly expands its research team and prototyping activities in Grand Rapids.16

• 2025 MQRE: $500,000
• Collaboration: $100,000 of the 2025 MQRE was incurred under a written agreement with Michigan State University.9

Step 3: Calculation of Unadjusted Credit

InnovateMI applies the dual rates for small businesses.1

1. Base Amount Portion (3%):
   $3\% \times \$250,000 = \$7,500$ 1
2. Excess Amount Portion (15%):

• Excess = Current MQRE ($500,000) – Base ($250,000) = $250,000.16
• $15\% \times \$250,000 = \$37,500$.1

1. University Collaboration Bonus (5%):

• Collaboration Portion of Excess = $100,000 (assumed all collab spend was part of the excess growth).
• $5\% \times \$100,000 = \$5,000$.9

Total Unadjusted Credit:

$$\$7,500 + \$37,500 + \$5,000 = \$50,000$$

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Step 4: Submission and Proration

InnovateMI submits its tentative claim for $50,000 through Michigan Treasury Online (MTO) by April 1, 2026.6

In late April 2026, the Treasury publishes the proration notice.6 Because total small business claims reached $30 million (exceeding the $25 million reserve), the proration percentage for small businesses is set at 83.33%.6

Final Adjusted Credit:

$\$50,000 \times 83.33\% = \$41,665$ 20

Step 5: Claiming the Refund

InnovateMI reports the $41,665 credit on its annual withholding return.6 If the company’s actual withholding tax liability for the year was only $15,000, they will receive a cash refund check from the state of Michigan for the remaining $26,665.1

Compliance, Audits, and Substantiation

To protect the integrity of the $100 million fund, the Michigan Department of Treasury is expected to be vigilant in auditing R&D claims, particularly for businesses claiming the 15% small business rate.12

Essential Documentation for Small Businesses

Unlike larger corporations with dedicated tax departments, small businesses must proactively build a “contemporaneous documentation” file to support their claim.12 This file should include:

• Project Lists: A comprehensive list of all research projects active during the calendar year, with descriptions clearly mapping to the federal “Four-Part Test”.12
• Time Tracking: Nexus between employee wages and specific research projects.12 While absolute precision is not always required, the business must have a “reasonable basis” for the allocation of time.12
• Supply Tracking: Invoices and inventory logs showing that materials were used for prototype development rather than general production.12
• Contractual Evidence: Fully executed contracts and invoices for any third-party research conducted in Michigan.3
• University Agreements: For those claiming the 5% bonus, a copy of the written collaboration agreement with the Michigan research university is mandatory.3

Retention Requirements

Records should be maintained for at least four years from the date the final tax return was filed.16 Small businesses should be particularly careful during ownership changes or mergers, as the burden of proof for the historical “base amount” (the 2022–2024 data) remains with the taxpayer during an audit of the 2025 claim.4

Conclusion: The Strategic Value of the Small Business Credit

The reintroduction of the Michigan R&D tax credit, with its deliberate emphasis on the “fewer than 250 employees” threshold, signals a new era for the state’s economic development.1 By providing a 15% marginal credit rate and a $25 million protected reserve, the state has acknowledged that the future of its automotive, aerospace, and life science industries depends on the success of smaller, agile innovators.1

For small business owners, the credit is more than just a reduction in tax liability; it is a vital source of non-dilutive capital that compensates for the cash flow challenges posed by federal amortization requirements.3 However, the program’s complexity—including the mandatory calendarization of expenses, the two-step tentative claim process, and the potential for proration—requires diligent planning.4 By adhering to the Treasury’s guidance and maintaining rigorous documentation of their Michigan-based research, small businesses can maximize this $250,000 annual opportunity to fuel their next generation of breakthroughs.1