Comprehensive Analysis of Michigan Unitary Business Groups and the 2025 Research and Development Tax Credit

A Unitary Business Group (UBG) in Michigan is a collection of related United States persons—corporations, insurance companies, or financial institutions—that operate as a single economic unit through common ownership and integrated operations. Under the 2025 Research and Development (R&D) tax credit, the UBG is defined as the statutory taxpayer, necessitating the consolidation of all member expenses and employee counts into a single, aggregated credit calculation.

The enactment of Public Acts 186 and 187 of 2024 represents a pivotal shift in the Michigan tax landscape, reintroducing a state-level incentive for innovation that had been absent since the early 2010s.1 This legislative framework is intricately linked to the broader structure of the Michigan Corporate Income Tax (CIT), which treats a group of entities as a unified taxpayer if they satisfy specific tests of control and operational interdependence.3 For businesses operating through complex multi-tiered corporate structures, understanding the nuances of UBG classification is not merely an administrative requirement but a fundamental component of tax liability and credit optimization. The credit is designed specifically to reward increased research activity within the state’s borders, but its application to a UBG requires a sophisticated analysis of intercompany eliminations, consolidated employee thresholds, and the calculation of a collective “base amount”.5 As Michigan continues to decouple from certain federal provisions under the Internal Revenue Code (IRC), the importance of this refundable credit grows, providing a critical mechanism for maintaining liquidity in the face of federal capitalization mandates.2

The Legal Framework and Definition of a Unitary Business Group

The foundational legal definition of a Unitary Business Group is established under Michigan Compiled Laws (MCL) Section 206.611(6). This statute defines a UBG as a group of United States persons that are corporations, insurance companies, or financial institutions, other than a foreign operating entity.3 To be classified as a UBG, the group must satisfy two distinct legal benchmarks: the Control Test and the Relationship Test. The classification as a UBG is mandatory under the Corporate Income Tax for any group of entities meeting these criteria, though an affiliated group may alternatively elect to be treated as a UBG under section 691(2) to simplify reporting.3

The Control Test and Ownership Standards

The Control Test is the primary filter for determining UBG membership. Under the statute, one person must own or control, directly or indirectly, more than 50% of the ownership interest with voting rights (or ownership interests that confer comparable rights to voting rights) of the other members.3 This standard ensures that the group is directed by a single decision-making authority, preventing the fragmentation of income among entities that are under common management. Revenue Administrative Bulletin (RAB) 2018-12 clarifies that this control can manifest in various forms, including parent-subsidiary chains and brother-sister relationships.4

In a parent-subsidiary controlled group, a common parent must own more than 50% of the voting power of at least one other entity, and each subsequent entity in the chain must have more than 50% of its interests owned by at least one other member of the group.4 This chain of ownership ensures that the economic interests of the entities are aligned. Indirect control is also considered, meaning that if Company A owns 60% of Company B, and Company B owns 60% of Company C, Company A is deemed to have indirect control over Company C, and all three would satisfy the control test as a single UBG.4

The Relationship Test: Operational Integration

The second benchmark is the Relationship Test, which confirms that the commonly owned entities are truly operating as a single business. Michigan law provides two alternative ways to satisfy this test. The first is through a “flow of value” between or among the members included in the group.4 This concept refers to the exchange of resources, capital, or services that creates a mutual economic benefit that would not exist if the entities were independent. The second alternative is through “business activities or operations which are integrated with, are dependent upon, or contribute to each other”.4

Functional integration often involves centralized administrative functions, such as human resources, legal services, accounting, and marketing.8 It may also involve a shared supply chain, where one member manufactures components used by another member, or where research developed by one subsidiary is implemented across the group’s product lines.8 The objective of the Relationship Test is to identify businesses that are so intertwined that their financial performance is the result of their collective efforts, making it appropriate to tax them as a single entity.

The 2025 Research and Development Tax Credit: Strategic Context

Effective for tax years beginning on or after January 1, 2025, Michigan has reestablished a refundable R&D tax credit to foster innovation and economic growth within the state.1 This new credit is available to Corporate Income Tax taxpayers, including UBGs, as well as certain flow-through entities that are not subject to the CIT but serve as employers subject to Michigan income tax withholding.1 The credit specifically targets businesses that increase their qualifying R&D expenditures relative to a historical base amount.5

Decoupling from Federal Section 174 Amortization

A primary driver for the enactment of this credit was Michigan’s legislative response to federal tax changes. Under the federal Tax Cuts and Jobs Act (TCJA), businesses were required to capitalize and amortize research and experimental (R&E) expenses over five years for domestic activities and fifteen years for foreign activities, rather than deducting them immediately.1 Although subsequent federal legislation attempted to restore immediate expensing, Michigan enacted House Bill 4961 in October 2025 to decouple from these federal provisions.1

This decoupling means that for Michigan tax purposes, businesses must continue to amortize R&D costs over five years even if they expensed them federally. The new state R&D tax credit serves as a critical offset to this requirement, providing a refundable benefit that helps restore the immediate cash flow advantage lost through amortization.2 For a UBG, this credit is especially valuable as it applies to the consolidated group, allowing the group to reduce its overall state tax liability or receive a cash refund regardless of the individual members’ separate profitability.2

Definition of Qualified Research Expenses (QREs)

Michigan’s R&D credit adopts the federal definition of “qualified research expenses” as found in Section 41(b) of the Internal Revenue Code.1 These expenses generally include wages paid to employees who are directly performing, supporting, or supervising research; the cost of supplies used in the research process; and a portion of expenses paid to third-party vendors for contract research conducted in Michigan.7

A significant limitation of the Michigan credit is its geographic requirement: only research conducted within the state of Michigan qualifies.2 Expenses incurred for research conducted outside the state cannot be used to calculate the credit or to determine eligibility.5 This ensures that the economic benefit of the credit remains within the state’s borders. For a UBG, this requires a meticulous tracking of research activities by member and location, as any work performed by a subsidiary in another state must be excluded from the group’s consolidated credit claim.2

The Role of the Unitary Business Group in Credit Calculations

In the context of the CIT, the UBG is the taxpayer.5 Consequently, when a corporation with R&D expenses is a member of a UBG, the UBG—not the individual corporation—is the entity that must claim the credit.5 This centralized approach means that all components of the credit calculation, including employee counts, total R&D expenses, the historical base amount, and the maximum credit caps, are determined at the UBG level.5

Aggregation of Employee Counts and Tiered Rates

The Michigan R&D credit features a tiered rate structure based on the number of employees. For a UBG, the employee count is the sum of all individuals employed by all members of the group.5 An employee is defined under the CIT as an employee as defined in IRC Section 3401(c), which generally includes any person from whom an employer is required to withhold federal income tax.5

This aggregation rule can be a double-edged sword for innovative subsidiaries. A small startup with only 50 employees that would otherwise qualify for the 15% “excess” rate will be relegated to the 10% rate if it is part of a UBG with more than 250 total employees.5 Conversely, the UBG as a whole benefits from a much higher annual cap of $2,000,000, compared to the $250,000 cap reserved for smaller entities.6 The Department of Treasury has indicated that it is developing further guidance on how to precisely count the number of employees, particularly for businesses that experience fluctuations in their workforce throughout the year.5

Calculation of the Consolidated Base Amount

The credit is calculated based on the increase in R&D spending over a “base amount,” defined as the average annual qualifying R&D expenses incurred during the three calendar years immediately preceding the tax year for which the credit is claimed.1 For a UBG, the base amount is the average of the consolidated Michigan R&D expenses for all members over those three years.5

The legislation provides specific rules for businesses that did not have R&D expenses for all three preceding years. If a taxpayer only had expenses in one or two of those years, the average is calculated using only those years.1 For businesses with no prior R&D expenses, the base amount is zero.1 This “zero base” provides a significant incentive for new R&D operations, as the entirety of their first-year spend will qualify for the higher 10% or 15% rate.10 Crucially, both fiscal-year and calendar-year filers must compute this base amount using expenses reported on a calendar-year basis.5 The Treasury is developing an optional method for fiscal-year filers to convert their data into calendar-year equivalents for the historical years prior to 2025.5

The University Collaboration Bonus

In addition to the standard credit tiers, Michigan offers an extra incentive for partnerships with academic institutions. All authorized businesses can claim an additional credit amount equal to 5% of the qualifying R&D expenses incurred in collaboration with a Michigan research university pursuant to a written agreement.2 This additional 5% bonus is capped at $200,000 annually per taxpayer.2 For a UBG, the 5% bonus is calculated on the portion of the group’s consolidated expenses that were part of a university collaboration, and the $200,000 cap applies to the entire group as a single taxpayer.5

Revenue Office Guidance and Administrative Procedures

The Michigan Department of Treasury has issued primary guidance through its “Notice Regarding New Research and Development Credit,” supplemented by responses to stakeholder comments in early 2025.1 This guidance establishes a rigorous administrative process designed to manage the statewide $100 million annual cap on R&D credits.1

The Tentative Claim System

To be eligible for the credit, a taxpayer must first submit a “tentative claim” in a form and manner prescribed by the Department.5 This claim identifies the unadjusted credit amount and includes information necessary for the administration of the credit, such as actual R&D expenses incurred during the calendar year.5 For R&D expenses incurred in 2025, the tentative claim must be submitted no later than April 1, 2026.1 In subsequent years, the deadline moves to March 15.1

The Treasury emphasizes that tentative claims must reflect actual, not estimated, expenses.1 Claims will not be accepted after the statutory deadline. This step is critical because the Treasury uses these tentative claims to perform a statewide calculation to determine if the total requested credits exceed the $100 million limit.2

Proration Rules and Statewide Caps

The $100 million total annual credit is split into two pools: $25 million reserved for small businesses (fewer than 250 employees) and $75 million for large businesses (250 or more employees).1

• If total small business claims are $25 million or less, they are not reduced. The remaining amount of the $100 million total is then available for large business claimants.11
• If total small business claims exceed $25 million, they are prorated among themselves so that their collective credit equals $25 million. Large business claims are similarly prorated to fit within their allotted $75 million.11
• If claims from small businesses comprise more than 25% of the total statewide claims, then the $25 million reservation is set aside, and all claims (both small and large) are prorated proportionally to reflect their share of the total $100 million.11

The Treasury plans to publish a notice on its website by April 30 each year informing taxpayers whether adjustments are required to their tentative claims.1 Once this notice is published, a UBG may proceed to claim its adjusted credit on its annual CIT return.5

Refundability and Reporting

The Michigan R&D credit is fully refundable.1 If the credit exceeds the UBG’s tax liability for the year, the excess amount is issued as a refund after all other nonrefundable credits have been applied.2 The credit cannot be assigned or transferred to another entity.1

Under MCL 206.718, the Treasury is required to report certain information to the governor and legislature annually, including the name of each business receiving the credit and the amount allowed.5 However, the Treasury has clarified that its public proration notice will not contain taxpayer-specific information.1

Technical Reporting and Intercompany Eliminations

A Unitary Business Group must file a combined return through a “Designated Member” (DM).8 In a parent-subsidiary UBG, the controlling member must serve as the DM if it has a nexus with Michigan. The DM is responsible for filing Form 4891 (CIT Annual Return) and all required schedules, including Form 4897, which collects data from individual group members.8

Eliminating Intercompany R&D Transactions

One of the most complex tasks for a UBG is the elimination of intercompany transactions. For CIT purposes, the business income and gross receipts of a UBG are the sum of the income and receipts of each member, less items arising from transactions between members.8 This principle applies directly to the R&D credit.

If Subsidiary A (a member of the UBG) pays Subsidiary B (also a member) $100,000 for research services conducted in Michigan, the UBG cannot claim both the $100,000 as a contract expense and the underlying wages paid by Subsidiary B. Instead, the intercompany payment is eliminated, and the UBG only claims the actual, primary costs—such as the wages and supplies—that Subsidiary B incurred to perform the work.8 This prevents the “artificial” inflation of the group’s research expenses through internal billing.

Application of the “Finnegan Rule”

Michigan follows the “Finnegan Rule” for unitary groups, which means that the sales of all members of the group are included in the Michigan sales factor numerator for apportionment purposes, regardless of whether each individual member has a nexus with the state.23 While this rule primarily impacts the group’s overall tax liability, it also ensures that the R&D credit, as a refundable incentive, is applied against a tax base that accurately reflects the group’s total economic footprint in Michigan.8

Case Study: The Unitary Tech Consortium

To illustrate the application of these rules, consider the “Unitary Tech Consortium,” which consists of a Michigan parent company (Parent Co) and three subsidiaries (Sub A, Sub B, and Sub C). All satisfy the control and relationship tests.

Step 1: Determining Employee Count and Tier

• Parent Co: 10 employees (Management)
• Sub A: 120 employees (Software Development in Michigan)
• Sub B: 130 employees (Hardware Prototyping in Michigan)
• Sub C: 50 employees (Marketing in California)

The group’s total employee count is $10 + 120 + 130 + 50 = 310$.5 Because the total is 250 or more, the UBG is a Large Business.6 This designation applies even though individual members Sub A and Sub B each have fewer than 250 employees.5

Step 2: Aggregating Michigan QREs and Base Amount

The group must identify Michigan-only R&D expenses for 2022, 2023, and 2024.

The Base Amount is the average: $(1.5M + 1.8M + 2.1M) / 3 = \$1.8M$.1

Step 3: 2025 Credit Calculation

In 2025, the group incurs $3.0M in Michigan QREs.

• Tier 1 (3% on Base): $3\% \times \$1.8M = \$54,000$.6
• Tier 2 (10% on Excess): $10\% \times (\$3.0M – \$1.8M) = \$120,000$.5
• Total Unadjusted Credit: $\$54,000 + \$120,000 = \$174,000$.

Step 4: University Bonus

Sub B worked with the University of Michigan on a new sensor, spending $400,000 in collaborative research.

• Bonus Credit: $5\% \times \$400,000 = \$20,000$.2
• Total Tentative Claim: $\$174,000 + \$20,000 = \$194,000$.

Step 5: Filing and Proration

The Parent Co (as DM) files a tentative claim by April 1, 2026. If the Treasury determines a 10% proration for large businesses due to high statewide demand, the Consortium’s final credit would be $\$194,000 \times 0.90 = \$174,600$.11 This amount is then claimed on the 2025 Form 4891 and is fully refundable if it exceeds the group’s total tax liability.2

Conclusion: Strategic Outlook for Michigan Innovators

The 2025 Michigan Research and Development tax credit represents a significant effort by the state to remain competitive in the Midwestern technological landscape. For Unitary Business Groups, the credit offers a substantial financial reward for expanding research activities, provided they can manage the complexities of consolidated reporting. The shift from immediate federal expensing to Michigan’s five-year amortization mandate makes this refundable credit an essential component of corporate tax planning.

Success in claiming the credit requires a proactive approach: identifying all members of the UBG, meticulously separating Michigan-based expenses from global activities, and adhering to the strict deadlines of the tentative claim process. As the Michigan Department of Treasury releases more detailed instructions and finalizes its electronic filing portals, UBGs should ensure that their intercompany accounting and employee tracking systems are robust enough to withstand the scrutiny of a state audit. For large corporate groups, the ability to receive a multi-million dollar cash refund for innovation serves not just as a tax relief measure, but as a source of capital to fuel the next generation of Michigan-made technology.

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