Analysis of the Major Portion of a Separate Unit Within the Minnesota Research and Development Tax Credit Framework

In Minnesota tax law, a “major portion of a separate unit” is a distinct business division or functional component transferred between taxpayers, necessitating the reallocation of its historical R&D data to the acquirer’s base amount calculation. This adjustment maintains the credit’s incremental nature by ensuring the successor’s spending is measured against the predecessor’s established research benchmarks.1

The statutory mechanism governing the transfer of research and development (R&D) attributes is a critical component of the Minnesota Credit for Increasing Research Activities. By requiring the adjustment of qualified research expenses (QREs) and gross receipts when a major portion of a trade or business—or a separate unit thereof—is acquired or disposed of, the law prevents the artificial inflation of research credits through corporate acquisitions. This ensures that the state’s fiscal incentives are directed toward genuine innovation and the expansion of technological capabilities within Minnesota, rather than merely subsidizing the consolidation of existing research departments.4 Understanding the nuance of what constitutes a “separate unit” and a “major portion” requires a deep dive into the intersection of Minnesota Statutes Section 290.068 and federal Internal Revenue Code (IRC) Section 41(f)(3).

The Statutory Architecture of the Minnesota Research Credit

The foundation of the Minnesota R&D tax credit is established in Minnesota Statutes Section 290.068. The credit is designed to reward corporations, partners in partnerships, and shareholders in S corporations for increasing their research efforts within the state.1 To maintain a framework that is both rigorous and familiar to taxpayers, Minnesota largely conforms to the definitions of qualified research found in federal law, specifically IRC Section 41.2

Historical Evolution and Policy Objectives

Since its enactment in 1981, the credit has undergone several transformations to reflect the state’s changing economic priorities. Originally patterned after the federal credit, the Minnesota version has fluctuated between refundable and nonrefundable status, and its tiered rates have been adjusted to focus on small-to-mid-sized innovation.5

The primary objectives of the credit are to create or retain high-quality jobs, increase state-wide research activity, and attract or retain businesses in the manufacturing and technology sectors.5 Statistics from the Minnesota Department of Revenue indicate that the manufacturing industry consistently claims the largest share—approximately 65 percent—of the credit.9 This concentration highlights why the rules regarding business acquisitions are so prominent; in the manufacturing sector, growth often occurs through the acquisition of specialized divisions or localized facilities.5

Conformity with IRC Section 41(f)(3)

Minnesota Statutes Section 290.068, Subdivision 4, explicitly states that if a taxpayer acquires or disposes of the major portion of a trade or business or the major portion of a separate unit of a trade or business in a transaction with another taxpayer, the taxpayer’s qualified research expenses and base amount are adjusted in the same manner provided by IRC Section 41(f)(3).1 This cross-reference is the “hook” that pulls federal regulatory definitions into the Minnesota state tax environment.

The federal rule in Section 41(f)(3) is often called the “consistency rule.” Its purpose is to ensure that the “base amount”—the benchmark used to measure an increase in research—is calculated using a set of business components that is consistent with the business as it exists in the current tax year.3 If a company buys a research lab in 2024, its “base amount” for 2024 must include the historical spending of that lab from previous years. Without this rule, the company would appear to have an enormous increase in R&D spending simply because it added the lab’s expenses to its own, even if the lab’s actual research activity remained stagnant.3

Defining the Core Concepts: Trade, Business, and Separate Unit

To apply the law, one must first determine if the transaction involves a “major portion” of a “separate unit.” Neither the Minnesota statute nor IRC Section 41 provides an exhaustive definition of these terms within the R&D section itself. Instead, tax professionals and revenue offices look to Treasury Regulation Section 1.52-2(b), which provides definitions for the Work Opportunity Tax Credit that are applied by extension to the R&D credit.3

The “Separate Unit” Definition

A separate unit is generally understood to be a component of a trade or business that is capable of being operated as a self-sustaining entity.3 It does not necessarily have to be a separate legal entity like a subsidiary; it can be a functional division within a larger corporation. Examples of separate units include:

• A distinct manufacturing plant or facility.3
• A specific regional branch of a service business.3
• A defined product line or division with its own management and accounting records.3
• A disregarded entity, such as a single-member LLC, that operates a specific part of the business.12

In the Minnesota context, the functional independence of the unit is paramount. If a company sells its “St. Paul Research Lab” to a competitor, that lab is a separate unit because it has its own location, employees, and discrete research mission.7

The “Major Portion” Qualitative Test

The determination of whether an acquisition involves a “major portion” of a unit is a qualitative and quantitative test based on the facts and circumstances of the transaction. It is not strictly defined by a percentage of assets.3 Rather, the question is whether the taxpayer acquired the assets necessary to continue the operation of the predecessor’s trade or business or unit.13

A significant ruling from the Minnesota Department of Revenue emphasizes that the transfer of intellectual property (IP) alone does not constitute the transfer of a separate unit. In a case where a taxpayer assigned all IP pertaining to an affiliate’s business but did not transfer the employees or facilities required to conduct the research, the court ruled that an “acquisition” and “disposition” had not occurred for purposes of the credit.13 Because the transferee did not acquire a viable, operating business, the transferor was not permitted to remove those historical R&D expenses from its own base amount calculation.13

Mechanics of Base Amount Adjustments

When a transaction meets the “major portion of a separate unit” criteria, both the acquirer and the seller must perform specific mathematical adjustments to their R&D credit calculations.1 These adjustments affect both the numerator and the denominator of the fixed-base percentage, as well as the prior years’ gross receipts used in the base amount formula.

The Incremental Nature of the Credit

The Minnesota R&D credit is calculated as follows:

$$Credit = Rate \times (Current\ Year\ QREs – Base\ Amount)$$

The “Base Amount” is generally the product of the taxpayer’s “fixed-base percentage” and its average annual gross receipts for the four preceding years.5 For most Minnesota taxpayers, the fixed-base percentage is determined by the ratio of research spending to gross receipts during the 1984–1988 period.5

Adjustments for the Acquirer (Successor)

For any taxable year ending after the acquisition, the acquirer must treat itself as having incurred the QREs and gross receipts of the acquired unit for all prior periods.3

1. Fixed-Base Percentage Adjustment: The acquirer must add the predecessor’s Minnesota QREs from 1984–1988 (attributable to the unit) to its own 1984–1988 QREs. Similarly, it must add the predecessor’s Minnesota gross receipts from that same period to its own.14
2. Average Gross Receipts Adjustment: For the four years preceding the current credit year, the acquirer must add the gross receipts of the acquired unit to its own gross receipts for each respective year.3

This process ensures that the acquirer’s “base” is large enough to account for the research history of the newly added unit.

Adjustments for the Seller (Predecessor)

The seller is permitted to “dispose” of its historical R&D attributes, effectively lowering its base amount for future years.2 This prevents the seller from being penalized for having a high historical base that was built by a division it no longer owns.10

However, the seller can only take this deduction if it provides the acquirer with the information necessary to make the corresponding increases in the acquirer’s calculation.10 This creates a legal and practical requirement for information sharing during the due diligence phase of a business sale.3

Local State Revenue Office Guidance and Application

The Minnesota Department of Revenue (MDOR) provides guidance through formal instructions for Schedule RD, administrative rules, and specific online updates.6

Schedule RD and Form M4

Taxpayers claiming the credit must file Schedule RD, Credit for Increasing Research Activities, along with their corporate franchise tax return (Form M4) or individual income tax return (Form M1).6 The instructions for Schedule RD reiterate the requirement for acquisition adjustments but place the burden of proof squarely on the taxpayer.7

For a unitary business—a group of corporations under common control—the credit is calculated at the combined level.4 This is particularly relevant for acquisitions, as the acquisition of a separate unit by one member of the group may affect the base amount calculation for the entire unitary group.4

The 2020 Guidance on Unitary Group Sharing

A pivotal piece of revenue office guidance was issued on June 18, 2020. The MDOR clarified that R&D credit carryovers must be applied to other members of a combined group.6 This update corrected a prior interpretation that had restricted the use of carryover credits only to the specific entity that generated them.6

Under this guidance, the hierarchy of credit application for a unitary group is:

1. Direct Use: The member that generated the credit uses it against its own tax liability first.6
2. Immediate Sharing: Any remaining current-year credit is shared among other members of the unitary group to offset their liabilities.6
3. Carryover Sharing: If unused credits remain, they are carried forward for up to 15 years by the earning member but can be shared with the group in those future years.6

This guidance is vital for companies that acquire a separate unit and bring it into their unitary group. The acquired unit’s legacy research credits (if any) and its future credits become part of the group’s collective tax planning strategy.6

MDOR Fact Sheet 14 and Audit Standards

The MDOR emphasizes documentation through Fact Sheet 14 and similar publications.7 To survive an audit regarding an acquisition adjustment, the taxpayer must maintain records that include:

• Project-level descriptions of the research performed by the acquired unit.7
• Payroll records, including the specific time spent by each employee on qualified research.7
• Documentation of the supplies used and the location of the research (must be in Minnesota).2
• Invoices and contracts for any third-party research conducted by the acquired unit.7

MDOR auditors often use specialized “Technical Advisers” or “Subject Matter Experts” (SMEs) from the Business Credit Practice Group to evaluate these claims.11 These specialists look for evidence of the “Four-Part Test” and verify that the “major portion” criteria were met in the transaction documents.7

Comprehensive Example: Acquisition of the “Gopher Lab” Division

To clarify the application of the “major portion of a separate unit” rule, consider a detailed scenario involving two manufacturing companies in Minnesota.

Background and Pre-Transaction Data

The Seller (Predecessor): Vulcan Manufacturing, a diversified industrial firm. Vulcan has a “Gopher Lab” division located in Duluth that specializes in testing new alloy compositions.

The Buyer (Successor): Iron Range Tech, a smaller company looking to expand its materials science capabilities.

On January 1, 2024, Iron Range Tech buys the Gopher Lab division from Vulcan for $15 million. The sale includes the lab’s facility, all specialized testing equipment, and the employment contracts of 25 research scientists. This is clearly the acquisition of a “major portion of a separate unit”.3

Historical Data for Gopher Lab (Minnesota Only):

• 1984–1988 Average QREs: $500,000
• 1984–1988 Average Gross Receipts: $5,000,000
• 2020–2023 Average Gross Receipts: $12,000,000

Pre-Acquisition Data for Iron Range Tech:

• 1984–1988 Average QREs: $1,000,000
• 1984–1988 Average Gross Receipts: $20,000,000
• Current Year (2024) QREs (excluding Gopher Lab): $2,500,000
• Pre-Acquisition 2020–2023 Average Gross Receipts: $30,000,000

Step 1: Recalculating the Fixed-Base Percentage

Iron Range Tech must now integrate Gopher Lab’s 1980s history into its own base calculation to maintain consistency.3

$$Original\ Fixed\text{-}Base\ \% = \frac{\$1,000,000}{\$20,000,000} = 5\%$$

$$Adjusted\ Fixed\text{-}Base\ \% = \frac{\$1,000,000 + \$500,000}{\$20,000,000 + \$5,000,000} = \frac{\$1,500,000}{\$25,000,000} = 6\%$$

The acquisition increased the buyer’s fixed-base percentage from 5% to 6%, which will result in a higher (and more accurate) base amount.10

Step 2: Adjusting the Average Annual Gross Receipts

Iron Range Tech must also add Gopher Lab’s recent revenue history to its own 4-year average.3

$$Adjusted\ Avg.\ Gross\ Receipts = \$30,000,000 + \$12,000,000 = \$42,000,000$$

Step 3: Calculating the 2024 Base Amount

The base amount is the higher of the historical calculation or 50% of current-year QREs.10

Total 2024 QREs for Iron Range (including Gopher Lab):

$$QREs_{Total} = \$2,500,000 + \$1,200,000 = \$3,700,000$$

Historical Base Calculation:

$$Base_{Hist} = 6\% \times \$42,000,000 = \$2,520,000$$

50% Floor Calculation:

$$Base_{Floor} = 50\% \times \$3,700,000 = \$1,850,000$$

Since $Base_{Hist} (\$2,520,000)$ is higher, it is used as the base amount.10

Step 4: Final Credit Calculation

Iron Range Tech applies the Minnesota tiered rates: 10% on the first $2,000,000 of excess QREs and 4% on the rest.2

Excess QREs:

$$Excess = \$3,700,000 – \$2,520,000 = \$1,180,000$$

Credit Amount:

$$Credit = 10\% \times \$1,180,000 = \$118,000$$

If Iron Range Tech had ignored the acquisition adjustment, it would have used its lower 5% rate and lower $30M gross receipts, resulting in a significantly different (and legally incorrect) credit amount.

Statistical Trends in the Minnesota R&D Credit

Data from tax expenditure reports and legislative analyses provide a window into the fiscal impact of these rules and the types of entities that rely on them.5

Fiscal Impact Projections (2024–2027)

The credit represents a major state investment in corporate innovation. The following table summarizes the projected fiscal impact on the State General Fund.8

These estimates reflect the state’s anticipation of continued industrial growth and the impact of the new partial refundability rules starting in 2025.8

Industry Concentration

A breakdown of credit claimants by industry reveals where the R&D activity is most robust in Minnesota. The following data is based on historical claimant patterns recorded by the MDOR.9

The dominance of the manufacturing sector explains why the “major portion of a separate unit” concept is so critical. Manufacturers frequently undergo reorganization, facility sales, and product line acquisitions, all of which trigger the need for base amount adjustments.5

The Shift to Partial Refundability in 2025

The most dramatic change to the Minnesota R&D tax credit in recent years was enacted in the 2025 omnibus tax legislation (House File 9).19 For tax years beginning after December 31, 2024, the credit transitioned from a strictly nonrefundable carryover model to a partially refundable model.7

Refundability Rates and Mechanics

The new law allows taxpayers to make an irrevocable election on their timely filed tax return to receive a refund of their unused current-year credit.7 This is designed to provide immediate cash flow to startups and research-intensive firms that may not yet have a tax liability.20

The refund is calculated after the current-year credit has reduced the taxpayer’s liability to zero. The “refundability rate” is then applied to the remaining unused credit.7

Starting in 2028, the Commissioner of Revenue will adjust the refundability rate annually based on revenue forecasts, ensuring that the total amount of refunds paid by the state does not exceed $25 million per year.19

Implications for Business Acquisitions

The introduction of refundability adds a significant layer of strategic importance to the “major portion of a separate unit” rules. In the past, an error in the acquisition adjustment might have only affected a carryover balance that would not be used for years. Now, an error in the calculation can directly affect the amount of cash a taxpayer receives in a refund check from the state treasury.20

For companies acquiring a research-heavy separate unit, the ability to claim a refundable credit makes the acquisition more valuable from a cash-flow perspective. Conversely, failure to properly adjust the base amount for the acquired unit’s history could lead to an overstatement of the credit, triggering an audit and potentially requiring the taxpayer to pay back the refund along with penalties and interest.6

Detailed Audit and Compliance Guidance

The Minnesota Department of Revenue is known for its rigorous examination of R&D credit claims, particularly regarding the nexus of the research activity and the documentation of employee time.6

Geographic Compliance: The Minnesota-Only Rule

The single most common audit adjustment in Minnesota is the removal of expenses for research conducted outside the state.2 When a taxpayer acquires a separate unit, it must perform a “geographic scrub” of the predecessor’s records. If the acquired unit had researchers in both Minnesota and another state (e.g., North Dakota), the acquirer must ensure that only the Minnesota-sourced QREs and receipts are brought into the base amount adjustment.1

Substantiating the “Major Portion”

Auditors will closely examine the purchase agreement of any acquisition reported as a separate unit. They look for evidence that the buyer acquired the “infrastructure of innovation”.3 This includes:

• Asset Lists: Verification that the lab equipment, specialized tools, and IP were transferred.7
• Employee Lists: Proof that the key personnel who performed the research moved to the new employer.7
• Operational Continuity: Evidence that the buyer continued the research projects of the predecessor unit without significant interruption.7

The Information Sharing Challenge

A unique hurdle in R&D credit compliance for acquisitions is the requirement that the seller must provide the buyer with historical data.3 If a seller refuses to provide its 1984–1988 Minnesota revenue and R&D data, the buyer may be unable to legally claim the credit for the acquired unit.10 Tax professionals recommend including specific “tax attribute sharing” clauses in M&A contracts to mandate the transfer of this data.

Record Retention Requirements

Minnesota’s general statute of limitations for tax assessments is 3.5 years from the date the return was filed.20 However, because the R&D credit relies on historical data from the 1980s, taxpayers are effectively required to maintain those base-period records indefinitely, or at least for as long as they are claiming the credit.7 For acquired units, the buyer must obtain these records from the seller at the time of the transaction, as they will be impossible to recreate years later during an audit.20

The Impact of Federal Section 174 Amortization

While the Minnesota R&D credit is based on IRC Section 41, recent federal changes to IRC Section 174 have created a complex interaction for Minnesota taxpayers.4

The Shift from Expensing to Amortization

Under the Tax Cuts and Jobs Act (TCJA), businesses are no longer allowed to immediately deduct research and experimentation (R&E) expenditures in the year they are incurred. Instead, they must amortize these costs over five years for domestic research and 15 years for foreign research.4

Minnesota generally conforms to these amortization requirements for the purpose of determining taxable income.7 This shift has significant implications for the “separate unit” rule:

1. Valuation of Acquisitions: When a company acquires a separate unit, it is also acquiring the “unamortized” research expenses of that unit. The buyer must understand how these legacy amortization schedules will impact its Minnesota taxable income.11
2. Credit vs. Deduction: Taxpayers must ensure they are not “double-dipping.” On the Minnesota return (Form M4I), corporations may need to subtract research expenses that were disallowed federally due to the R&D credit, but only to the extent they exceed the Minnesota credit claimed on Schedule RD.24

This interplay requires a holistic view of the tax return, where the acquisition adjustment for the credit is coordinated with the amortization adjustments for taxable income.

Pass-Through Entities and Credit Allocation

For partnerships and S corporations, the R&D credit—and the acquisition adjustments associated with it—flow through to the individual owners.5

Pro-Rata Allocation

The credit is allocated to partners or shareholders in the same manner as provided by IRC Sections 41(f)(2) and 1366(a).6 This means that if a partnership acquires a separate unit, the adjusted base amount is calculated at the partnership level, and the resulting credit is then distributed to the partners based on their ownership interest.6

Individual owners receive their share of the credit on Schedule KPI (for partnerships) or Schedule KS (for S corporations).6 They then claim the credit on their personal Minnesota income tax return using Schedule M1C.6

Special Rule for Corporation Partners

If a corporation is a partner in a partnership that generates an R&D credit, the credit allowed for the taxable year is limited to the lesser of:

1. The corporation’s actual tax liability.1
2. An amount separately computed based on the corporation’s specific interest in that partnership’s trade or business.1

This “separate computation” rule prevents a corporation from using R&D credits from a minority partnership interest to offset the tax liability generated by its own unrelated primary business activities.

Conclusion: Navigating the Future of Minnesota Innovation

The Minnesota Credit for Increasing Research Activities remains one of the state’s most potent tools for economic development, but its complexity—particularly in the context of business acquisitions—requires careful management. The “major portion of a separate unit” rule is the gatekeeper of the credit’s integrity, ensuring that taxpayers are rewarded only for genuine growth in their research footprint.3

As Minnesota moves into an era of partial refundability, the importance of accurate acquisition adjustments will only increase. For businesses, the key to success lies in:

• Meticulous Due Diligence: Identifying the historical R&D attributes of any acquired unit before the deal closes.3
• Contractual Protections: Mandating the sharing of 1980s-era tax data in purchase agreements.3
• Robust Documentation: Maintaining project-level records that can withstand the scrutiny of MDOR technical advisers.7
• Strategic Unitary Planning: Utilizing the 2020 guidance to share credits and carryovers effectively across the entire business group.6

By mastering these rules, Minnesota companies can continue to push the boundaries of technology and manufacturing, confident that their investments in the state’s future will be recognized and rewarded by the tax code. The intersection of law, accounting, and innovation in the R&D credit reflects Minnesota’s commitment to being a premier destination for the high-tech industries of the 21st century.5

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