The Michigan Research and Development Tax Credit: An In-Depth Analysis of the Small Business Credit Rate and the Fifteen Percent Excess Mechanism

The Michigan Small Business Credit Rate provides a two-tiered incentive of three percent on baseline expenditures and fifteen percent on any incremental growth in research and development spending within the state. This targeted approach specifically favors high-growth startups and established small enterprises with fewer than 250 employees by providing a refundable cash benefit for expanding their research footprint in Michigan.

Overview of the Small Business Innovation Incentive

The re-establishment of a research and development incentive in Michigan represents a strategic shift in the state’s economic policy, designed to foster a competitive environment for technological advancement.1 Effective for tax years beginning on or after January 1, 2025, the Michigan R&D tax credit introduces a tiered structure that prioritizes small businesses.3 While large corporations are eligible for a ten percent credit on their excess expenditures, small businesses are incentivized with a significantly higher rate of fifteen percent.5 This delta is a deliberate policy choice aimed at reducing the cost of capital for emerging firms that often face the highest hurdles in securing funding for innovation.4

The “fifteen percent on excess” component is an incremental credit mechanism. It does not simply apply to all research spending; rather, it targets the “excess”—the portion of current-year spending that surpasses a company’s historical three-year average.8 For a small business, this creates a powerful incentive to not just maintain but aggressively increase their investment in Michigan-based research activities.4 Because the credit is refundable, it provides immediate liquidity, allowing pre-profit startups to receive cash payments even if they have zero state tax liability.1

Legislative Framework and the Re-establishment of Innovation Policy

The legislative journey to the current R&D credit was marked by a bipartisan consensus on the necessity of re-establishing Michigan as a hub for the automotive, semiconductor, and life sciences industries.5 The expiration of previous state-level R&D credits in 2012 left Michigan as one of the few Midwestern states without a dedicated incentive for innovation.2 To address this gap, Governor Gretchen Whitmer signed a package of bills in early 2025, including House Bills 5100 and 5101, which are now codified as Public Acts 186 and 187 of 2024.3

The legislative package is composed of several key bills that function in tandem:

This legislative structure ensures that the credit is accessible to nearly all business forms, from large C-corporations to small S-corporations and LLCs.5 By establishing the credit under both the Corporate Income Tax and the Withholding Tax chapters of the Michigan Income Tax Act, the state ensures that the legal structure of a business does not become a barrier to accessing innovation incentives.6

Definitional Compliance: Small Business Status and Employee Counting

The application of the fifteen percent rate is predicated on a company qualifying as a “small business.” Under the law, a small business is defined as an authorized business with fewer than 250 employees.1 This threshold is critical because it determines whether a firm is subject to the $250,000 individual annual credit cap or the more substantial $2,000,000 cap reserved for larger entities.1

The Michigan Department of Treasury has issued specific guidance regarding the methodology for counting employees to ensure uniform application of the law.12 An employee is defined consistent with Internal Revenue Code Section 3401(c), which typically includes any individual for whom an employer is required to withhold federal income tax.17 Key considerations for employee counting include:

1. Total Headcount: The count is not limited to research staff; it includes all employees across all functions of the business.18
2. Geographic Scope: Guidance from the Treasury clarifies that the 250-employee threshold applies to the entire company’s headcount, though the research expenses themselves must be Michigan-sourced.12
3. Unitary Business Groups (UBGs): If a business is part of a UBG, the employee count, base amount, and expense calculations must be performed on an aggregated basis for the entire group.12 This prevents a large corporation from spinning off a small subsidiary solely to capture the higher fifteen percent small business rate.12
4. Disregarded Entities: These entities are generally not eligible to claim the R&D credit in their own right; rather, their activities and expenses are attributed to their owner.4

The Treasury plans to issue a Revenue Administrative Bulletin (RAB) to provide further clarity on how part-time employees and contractors are treated within the headcount for the purposes of the unadjusted credit calculation.12

The Mechanics of the Fifteen Percent Rate on Excess Expenditures

The core of the small business incentive is the tiered calculation of the “unadjusted credit.” The term “unadjusted” refers to the credit amount before any statewide proration is applied.12 For small businesses, the credit is the sum of two distinct calculations based on their qualified research expenditures (QREs) in the state of Michigan.2

Tier One: Baseline Expenditures

Every small business that conducts qualified research in Michigan is eligible for a three percent credit on expenditures up to their historical base amount.5 This ensures that even businesses with stable or slightly declining R&D budgets still receive a level of tax relief for maintaining their innovative capacity within the state.2

Tier Two: Excess Expenditures

The significant benefit for small businesses lies in the fifteen percent rate applied to the “excess”—defined as the amount of current-year QREs that exceeds the historical base amount.5 This fifteen percent rate is fifty percent higher than the ten percent rate offered to large businesses for their excess spending.3 This higher rate is designed to catalyze growth by providing a substantial cash-back incentive for every additional dollar a startup or mid-market firm invests in Michigan-based innovation.7

The total unadjusted credit ($C_u$) for a small business with fewer than 250 employees can be modeled using the following formula:

If $QRE_{current} \le Base_{amount}$:

$$C_u = QRE_{current} \times 0.03$$

If $QRE_{current} > Base_{amount}$:

$$C_u = (Base_{amount} \times 0.03) + ((QRE_{current} – Base_{amount}) \times 0.15)$$

The resulting value $C_u$ is subject to an individual taxpayer cap of $250,000 per year.1 Any amount exceeding this cap is disallowed at the individual level before any statewide proration calculations begin.20

Qualified Research Expenditures: Technical and Geographic Standards

To qualify for the Michigan R&D tax credit, expenses must meet the rigorous definitions established by federal law while strictly adhering to Michigan’s geographic boundaries.1 The Michigan law adopts the definition of “qualified research” found in Section 41 of the Internal Revenue Code (IRC).1

The Four-Part Test

For activities to generate eligible QREs, they must pass the IRS Four-Part Test:

1. The Section 174 Test: The activity must be eligible for treatment as a research and experimental expenditure under IRC Section 174.3
2. The Technological Information Test: The research must rely on principles of the physical or biological sciences, engineering, or computer science.5
3. The Business Component Test: The research must be intended to be useful in the development of a new or improved business component of the taxpayer (a product, process, software, technique, formula, or invention).2
4. The Process of Experimentation Test: Substantially all of the activities must constitute a process of experimentation, involving the identification of uncertainty, the development of alternatives, and the systematic testing and refinement of those alternatives.5

Michigan Geographic Nexus

Unlike the federal R&D credit, which captures research across the entire United States, the Michigan credit is strictly limited to research physically conducted within the state.1 This geographic nexus is absolute; even if a business is headquartered in Michigan, any research activity performed at a facility in another state is excluded from both the current-year calculation and the historical base amount calculation.6

The Role of the Historical Base Amount in the Incremental Credit Method

The “base amount” is the pivot point that separates the three percent credit from the fifteen percent “excess” credit.4 In Michigan, the base amount is defined as the average annual amount of qualifying R&D expenses incurred during the three calendar years immediately preceding the tax year for which the credit is claimed.14

Calculation Rules for the Base Amount

The Michigan Department of Treasury has clarified how businesses should handle different historical spending profiles to ensure they can correctly determine their “excess” spending.4

1. Standard Three-Year History: For established firms, the base is the simple average of Michigan QREs from the three prior calendar years.4
2. Partial History: If a business only has one or two years of prior R&D spending in Michigan, the base is the average of those specific years only.12
3. New Startups (No History): For an authorized business with no prior qualifying research expenses in Michigan, the base amount is zero.4 This provides a massive advantage to new ventures, as 100% of their first-year Michigan QREs will qualify for the fifteen percent excess rate.8
4. Short Taxable Years: These are treated as full years for the purposes of the base calculation, and no annualization of expenses is required.4
5. Calendar Year Consistency: Crucially, the base amount must be calculated using a calendar-year period (January to December), regardless of the business’s actual fiscal year-end.12

This incremental method is fundamentally different from the federal Alternative Simplified Credit (ASC), which typically uses a base amount equal to fifty percent of the average QREs for the prior three years.2 Michigan’s choice to use 100% of the three-year average as the base means the “excess” is harder to reach but rewarded at a much higher rate (15% vs the federal ASC rate of 14%).2

University Collaboration: Enhancing the Credit Through Academic Partnerships

To further incentivize ties between the private sector and Michigan’s educational institutions, the law provides an additional five percent credit for research conducted in collaboration with a Michigan research university.1 This collaboration bonus is available to both large and small businesses and is additive to the baseline and excess rates.5

Requirements for the University Bonus

A “research university” is defined as a public university in Michigan or an independent nonprofit college or university within the state.4 To claim the additional five percent credit, the following conditions must be met:

• The expenses must be for qualified research conducted in Michigan.1
• There must be a written agreement between the taxpayer and the university.8
• The additional credit is capped at $200,000 per tax year per taxpayer.4
• Small businesses effectively receive a twenty percent credit (15% excess + 5% bonus) on their incremental research spending that involves a university partner.8

This collaboration credit is particularly valuable for small businesses in the biotechnology and engineering sectors that rely on university lab facilities and academic expertise for their experimental development.2

State Revenue Office Guidance and Administrative Compliance

The Michigan Department of Treasury is the primary administrative body responsible for the R&D tax credit.15 On April 2, 2025, the Treasury published a critical “Notice Regarding New Research and Development Credit,” which outlined the initial filing requirements and confirmed the state’s intent to issue more detailed Revenue Administrative Bulletins.12

The Mandatory Tentative Claim

The credit is not an automatic entitlement claimed solely on an annual tax return. Instead, a business must first file a “tentative claim” through the Michigan Treasury Online (MTO) portal to secure a portion of the statewide cap.12

The Treasury has emphasized that tentative claims must use actual expenditures rather than estimates.12 This is because the statewide proration calculations are based on the aggregate of these tentative claims.12 If a company fails to file a tentative claim by the statutory deadline, it is barred from claiming the credit for that calendar year.8

The Refundability Feature: Providing Liquidity to Pre-Profit Enterprises

For many small businesses, the defining characteristic of the Michigan R&D credit is its full refundability.8 Traditional tax credits are often nonrefundable, meaning they can only be used to reduce a company’s tax bill to zero. If a business has no profit (and thus no tax liability), a nonrefundable credit provides no immediate benefit and must be carried forward to future years.5

The Michigan R&D credit functions differently. After all nonrefundable credits are applied to the taxpayer’s liability, any remaining R&D credit balance is paid to the business as a cash refund.1 This provides a direct cash injection to startups that are heavily invested in R&D but have not yet reached commercial profitability.8

For flow-through entities, the credit is claimed against Michigan withholding tax.13 If the credit exceeds the withholding liability, the excess is refunded to the entity itself.13 It is important for business owners to understand that this credit cannot be passed through to the individual income tax returns of the partners or shareholders; it remains an asset of the business entity.12

Strategic Financial Modeling: Practical Calculation Scenarios

To understand the practical impact of the fifteen percent excess rate, businesses should model their potential credits based on their historical Michigan research spend. The following examples illustrate how the base amount and the small business cap interact.

Example 1: High-Growth Michigan Startup

A technology startup with 20 employees launched in Ann Arbor in 2024.

• 2024 Michigan QREs: $100,000
• 2025 Michigan QREs: $1,500,000

Step 1: Determine the Base Amount

Since the company only has one year of history (2024), the base amount is that year’s expense.12

$$Base_{amount} = \$100,000$$

Step 2: Calculate the Unadjusted Credit

The first $100,000 (up to the base) is credited at three percent. The remaining $1,400,000 (the excess) is credited at fifteen percent.

$$Credit_{baseline} = \$100,000 \times 0.03 = \$3,000 \\ Credit_{excess} = \$1,400,000 \times 0.15 = \$210,000 \\ Total\ Unadjusted\ Credit = \$3,000 + \$210,000 = \$213,000$$

Because $213,000 is below the $250,000 small business cap, the full amount is eligible as a tentative claim.8

Example 2: Mature Small Business with Flat Spending

A specialized manufacturing firm with 150 employees has consistent R&D operations.

• Prior 3-Year Average (Base): $2,000,000
• 2025 Michigan QREs: $2,000,000

Step 1: Calculate the Unadjusted Credit

Since there is no “excess” spending (spending did not exceed the base), only the three percent baseline rate applies.

$$Total\ Unadjusted\ Credit = \$2,000,000 \times 0.03 = \$60,000$$

This firm receives a $60,000 credit for maintaining its research footprint, but it misses out on the fifteen percent rate because it did not grow its innovation budget.8

Example 3: Small Business Exceeding the Individual Cap

An aggressive medical device startup with 40 employees.

• Base Amount (3-year avg): $0 (New to Michigan)
• 2025 Michigan QREs: $2,500,000

Step 1: Calculate the Unadjusted Credit

Since the base is zero, the fifteen percent rate applies to the entire expenditure.

$$Total\ Calculation = \$2,500,000 \times 0.15 = \$375,000$$

Step 2: Apply Individual Cap

The credit for a small business is strictly limited to $250,000 per year.1 Therefore, this company’s tentative claim will be capped at $250,000.

Statewide Caps and the Proration Contingency

While the unadjusted credit defines what an individual business is eligible to receive, the actual amount awarded may be lower due to the statewide program caps.1 The Michigan legislature has authorized a total of $100 million in R&D credits per year.1

The Small Business Reserve

To protect smaller innovators from being crowded out by large corporations, the state has reserved $25 million of the $100 million total specifically for businesses with fewer than 250 employees.2

• Large Business Cap: $75,000,000 available.5
• Small Business Cap: $25,000,000 reserved.1

Proration Mechanics

If the total tentative claims from small businesses exceed the $25 million reserve, the Department of Treasury will apply a proration percentage to every small business claimant.16 For example, if small businesses submit $50 million in tentative claims, the Treasury will notify all claimants that their awarded credit will be fifty percent of their unadjusted claim.16

However, the law allows for a degree of flexibility. If small businesses exceed their $25 million reserve but large businesses do not exhaust their $75 million allotment, the remaining funds may be used to cover the small business overflow.16 If the total claims from all businesses exceed the $100 million global cap, a second layer of proration is applied across all taxpayers to ensure the state’s fiscal exposure remains within the statutory limit.1

The Treasury’s “Proration Notice,” expected to be published annually by April 30, is a critical document that businesses must review before officially claiming the credit on their tax returns.12

Interplay with Federal Law and Section 174 Amortization

The importance of the Michigan R&D credit is magnified by recent changes to federal tax law regarding the treatment of research and experimental (R&E) expenditures.5 Traditionally, businesses could deduct R&D expenses immediately in the year they were incurred. However, under the Tax Cuts and Jobs Act (TCJA) and subsequent Michigan conformity updates, these costs must now be capitalized and amortized over five years for domestic research and fifteen years for foreign research.4

The Michigan Decoupling

On October 7, 2025, Michigan enacted House Bill 4961, which updated the state’s conformity with the Internal Revenue Code but specifically decoupled from certain federal expensing provisions.5 This means that for Michigan tax purposes, businesses must continue to amortize their R&D costs over five years even if they are allowed to expense them federally.5

This creates a “timing penalty” where Michigan businesses may have higher taxable income in the early years of a project because they cannot take a full deduction for their research spending.5 The refundable R&D tax credit serves as a bridge, providing a direct reduction of tax liability or a cash payment that helps offset the cash-flow burden of the amortization requirement.5 For small businesses, the fifteen percent excess rate is specifically designed to ensure that the “cost” of amortization does not discourage local innovation.5

Conclusion: Strategic Value of the Fifteen Percent Rate

The Michigan Small Business Credit Rate—specifically the fifteen percent incentive on excess expenditures—is a cornerstone of the state’s renewed commitment to industrial innovation. By rewarding growth rather than mere baseline spending, Michigan has created a mechanism that actively pulls research investment into the state. For firms with fewer than 250 employees, this credit is not just a tax break; it is a vital source of non-dilutive capital that supports the high-risk, high-reward phase of technological development.

The complexity of the program, particularly regarding the historical base amount calculation and the mandatory tentative claim process, requires rigorous compliance. Businesses must maintain an airtight audit trail, ensuring that every dollar claimed under the fifteen percent rate is backed by documentation that satisfies both the federal Four-Part Test and the Michigan geographic nexus.

As the program goes live in 2025, Michigan-based startups and small manufacturers are positioned to be among the most incentivized innovators in the nation. The combination of full refundability, a high incremental rate, and bonus incentives for university collaboration creates a unique environment where the financial risks of innovation are meaningfully shared by the state. For professional tax planners and business leaders, the 15% on excess is the primary lever to be pulled in any multi-year Michigan growth strategy.

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