Michigan’s 2025 Tax Changes:
What Michigan Manufacturers
Need to Know
Michigan decouples from federal OBBB tax benefits — including bonus depreciation, R&D expensing, and interest deductions. If your business operates in Michigan, your state tax liability may be significantly higher than your federal calculations suggest.
Michigan’s new tax rules, enacted through H.B. 4961 and effective January 1, 2025, create significant departures — or “decouplings” — from federal tax benefits that the One Big Beautiful Bill recently expanded. For manufacturers doing business in Michigan, this decoupling means higher state taxable income, higher state taxes, and a dramatically more complex compliance burden of maintaining separate federal and Michigan calculations for depreciation, R&D expenses, and interest deductions. At Kal Onomato, our state and local tax advisory team helps Michigan manufacturers and multi-state businesses navigate every dimension of these changes with financial precision.
Three Areas Where Michigan Departs from Federal Tax Code
Michigan’s decoupling from the federal One Big Beautiful Bill concentrates in three specific areas that matter most to manufacturers: how capital equipment purchases are depreciated, how research and development expenses are treated, and how interest expense deductions are limited. In each area, Michigan’s rules are more restrictive than federal rules — meaning your state taxable income will be higher than your federal taxable income in the years you make capital investments, launch R&D projects, or carry significant debt.
Bonus Depreciation & Section 179
Michigan disallows all federal bonus depreciation for C-Corps. Pass-throughs get 40% in 2025, 20% in 2026, and zero from 2027. Section 179 limits also remain below federal levels.
Research & Development Amortization
Federal rules allow immediate R&D deductions. Michigan requires amortization over 5 years for U.S. R&D and 15 years for international R&D — dramatically slowing cash recovery.
Business Interest Limitations
Michigan caps interest deductions at 30% of EBIT — tighter than the restored federal EBITDA-based limit under OBBB — hitting capital-intensive manufacturers particularly hard.
Bonus Depreciation — The Biggest Hit for Capital-Intensive Manufacturers
Federal bonus depreciation was restored to 100% under the One Big Beautiful Bill — meaning manufacturers can deduct the full cost of qualifying equipment purchases in the year of purchase on their federal return. Michigan’s treatment is dramatically different, and the gap between federal and state treatment creates a significant cash flow disparity that plan sponsors and CFOs must account for in investment timing and cash flow projections.
- C-Corporations: Michigan continues to disallow all federal bonus depreciation entirely. C-corps must add back any federal bonus depreciation amount to Michigan taxable income — reducing immediate deduction benefits to zero on the state return.
- Pass-Through Entities & Individuals: Bonus depreciation is available but reduced — 40% of cost is allowed in tax year 2025, declining to 20% in 2026, and eliminated entirely for 2027 and beyond.
- Section 179 Expensing: Michigan’s expensing limits remain below the federal level. Any expense exceeding Michigan’s cap must be depreciated over time rather than deducted all at once in the year of purchase.
- Qualified Production Property: Michigan will not recognize special federal depreciation under Section 168(n) for “qualified production property.” Federal deductions in this category must be added back and depreciated over time on the Michigan return.
An S-corporation purchases new machinery in 2025 for $500,000 and claims 100% bonus depreciation on its federal return — deducting the entire $500,000 in year one. Michigan allows only 40% ($200,000) in 2025. The remaining $300,000 must be depreciated over subsequent years, increasing Michigan taxable income by $300,000 in the year of purchase. At a 6% Michigan CIT rate, that’s approximately $18,000 in additional state tax due in 2025 alone — tax that would not exist if Michigan conformed to federal rules.
R&D Expenses — Slower Recovery, Delayed Innovation
Federal tax law, strengthened under the One Big Beautiful Bill, now allows immediate expensing of research and experimental costs — meaning manufacturers can deduct R&D investments in the year they are incurred on their federal return. Michigan does not conform to this provision. The state requires all R&D expenses to be amortized over multi-year schedules — significantly slowing the cash recovery from innovation investments and affecting the ROI calculations that determine whether and when manufacturers can afford to invest in new product development.
- U.S.-Based R&D Expenses: Must be amortized over 5 years on the Michigan return — rather than deducted in full in the year incurred as allowed under federal rules.
- International R&D Expenses: Subject to an even longer 15-year amortization schedule on the Michigan return — creating a much more extended cash recovery timeline for manufacturers with global R&D operations.
- Record-Keeping Impact: Manufacturers must maintain separate Michigan R&D amortization schedules entirely distinct from their federal expensing records — adding a substantial record-keeping and compliance burden for finance teams.
An electronics manufacturer invests $100,000 in U.S.-based product development in 2025. Federally, the entire $100,000 is deductible in 2025. On the Michigan return, only $20,000 (1/5th of the total) is deductible in 2025 — with the remaining $80,000 spread over the next four years. The cash recovery timeline for the investment extends dramatically, potentially delaying the manufacturer’s decision to fund the next R&D project.
Interest Expense Limitations — Higher Costs for Manufacturers Financing Growth
Under the One Big Beautiful Bill, the federal business interest deduction limitation was restored to an EBITDA-based calculation — a more generous standard that allows manufacturers to deduct more interest expense when financing capital equipment, facility improvements, or operational expansion. Michigan departs from this federal improvement and retains a tighter EBIT-based limitation, capping interest deductions at 30% of Earnings Before Interest and Taxes. For capital-intensive manufacturers that rely on financing for modernization and growth, this difference can translate into meaningful additional state tax liability.
📌 The Michigan EBIT cap catches many manufacturers by surprise. A manufacturer borrowing $2,000,000 at 6% to finance a facility expansion carries $120,000 in annual interest expense. If Michigan EBIT is $300,000, only $90,000 (30%) is deductible — leaving $30,000 of interest expense non-deductible on the Michigan return. At the 6% CIT rate, that is approximately $1,800 in additional annual state tax from interest deductions alone. Our tax advisory team helps manufacturers model the interest deduction limitation against their specific financing structure and identify planning strategies to minimize the impact.
Why This Matters for Michigan Manufacturers
The decoupling from federal tax benefits creates three compounding pressures that affect Michigan manufacturers’ competitive position, cash flow, and ability to reinvest in their operations. Understanding these pressures clearly is the first step to addressing them strategically. Our financial advisory team models all three dimensions for every Michigan manufacturer client we serve.
Real-World Examples of the Michigan Decoupling Impact
These scenarios illustrate how the Michigan decoupling directly affects the tax position and cash flow of manufacturers in common business situations.
Purchasing New Equipment — Grand Rapids Auto Supplier
A pass-through auto supplier purchases $500,000 in robotics in 2025. Under OBBB, 100% is deductible federally. Michigan allows only 40% ($200,000) — increasing Michigan taxable income by $300,000 and generating approximately $18,000 in additional state tax in year one alone.
Launching R&D — Electronics Manufacturer
An electronics manufacturer invests $100,000 in product development. Federally, all $100,000 is deductible immediately. In Michigan, only $20,000 is deductible in year one — slowing cash recovery across five years and potentially delaying the decision to fund the next innovation cycle.
Financing Facilities — Capital-Intensive Manufacturer
A manufacturer relying on loans for modernization finds that Michigan’s tighter EBIT-based interest cap — rather than the restored EBITDA federal standard — limits their interest deduction, increasing state tax liability at the exact moment they are investing in future capacity.
Federal vs. Michigan Treatment — Side-by-Side Comparison
The following table summarizes the key decoupling differences that Michigan manufacturers must track separately for state vs. federal compliance. Every row represents a point at which your Michigan taxable income may be higher than your federal taxable income — and a point at which separate record-keeping is required. Our SALT advisory team builds complete Michigan vs. federal reconciliation schedules for every manufacturer client we serve.
| Tax Provision | Federal (OBBB) | Michigan (H.B. 4961) | Michigan Impact |
|---|---|---|---|
| Bonus Depreciation — C-Corps | 100% immediate deduction | 0% — full add-back required | Highest Risk |
| Bonus Depreciation — Pass-Throughs | 100% immediate (2025) | 40% (2025) → 20% (2026) → 0% (2027+) | High Risk |
| Section 179 Expensing | Higher federal limit | Lower Michigan cap; excess depreciated | Moderate |
| Qualified Production Property (§168(n)) | Special federal depreciation allowed | Not recognized — add-back required | High Risk |
| U.S. R&D Expenses | Immediate full deduction | 5-year amortization required | Moderate |
| International R&D Expenses | Immediate full deduction | 15-year amortization required | High Risk |
| Business Interest Deduction Limit | 30% of EBITDA (restored under OBBB) | 30% of EBIT (tighter) | Moderate |
Six Actions Michigan Manufacturers Should Take Right Now
The following six steps provide a structured approach to managing the Michigan decoupling proactively — protecting your cash flow, maintaining compliance, and preserving your competitive position. Our financial advisory team and tax planning team manage all six steps for Michigan manufacturer clients under active engagement. Explore advisory outcomes at kal-onomato.com/client-stories.
Re-Evaluate the Timing of Major Capital Investments
Time major equipment purchases and facility investments with both federal and Michigan depreciation treatment in mind. The gap between 100% federal bonus depreciation and Michigan’s phased or zero allowance creates a significant state tax cost in the year of purchase — and that cost will increase to 100% of the Michigan add-back by 2027 for pass-throughs. Understanding the tax cost of each investment before committing allows you to optimize timing and structure.
Forecast Cash Flow and Tax Liability Under the New Michigan Rules
Use Michigan’s new depreciation, R&D, and interest rules to project the impact on your annual tax payments and company liquidity for 2025, 2026, and beyond. For manufacturers making significant capital investments or R&D commitments, the multi-year cash impact of deferred deductions can be substantial. Our financial advisory team builds these projections for Michigan manufacturer clients as part of our integrated tax and financial planning service.
Upgrade Your Record-Keeping to Maintain Separate Michigan and Federal Schedules
Michigan manufacturers must now maintain entirely separate depreciation schedules, R&D amortization records, and interest expense limitation calculations for Michigan vs. federal purposes. These are not small adjustments to existing records — they are fundamentally different calculations that must be tracked in parallel. Finance teams that are not currently set up for this level of separation need to address the gap immediately to avoid errors and potential audits.
Review and Update Michigan Quarterly Estimated Tax Payments
Manufacturers who calculated their 2025 Michigan quarterly estimated payments based on federal calculations — without adjusting for the bonus depreciation add-backs, R&D amortization requirements, and interest expense limitations — may have significantly underpaid Michigan CIT. Review all four 2025 quarterly payments against the correct Michigan calculations and assess underpayment exposure. Note that the Michigan Treasury has announced a penalty and interest waiver for certain underpayments tied to the OBBB/H.B. 4961 decoupling — but the waiver requires a written request and full 2025 annual payment by April 30, 2026.
Engage a Manufacturing-Focused Multi-State Tax Advisor
The Michigan decoupling from OBBB benefits is not a simple adjustment that can be handled as a year-end add-back. It requires ongoing, proactive management of investment timing, depreciation scheduling, R&D tracking, and interest expense planning across both federal and state tax dimensions simultaneously. A manufacturing-focused tax advisor with multi-state expertise — who understands both the federal OBBB provisions and Michigan’s specific decoupling positions — is essential for navigating these rules correctly and minimizing their cost. Our SALT advisory team at Kal Onomato serves Michigan and multi-state manufacturers across all 50 states from our Florida base.
Communicate the Business Impact to Lawmakers, Industry Groups, and Lenders
Michigan’s decoupling from federal tax benefits has real consequences for job creation, capital investment, and regional competitiveness. Consider informing industry associations, legislative contacts, and lenders about the specific operational impacts on your business — from reduced reinvestment capacity to increased financing costs. Organized business advocacy has influenced Michigan’s approach to tax conformity before, and manufacturers who document and communicate their experience are well-positioned to contribute to future policy conversations.
🌟 Multi-state OBBB and decoupling strategy is where Kal Onomato adds the most value. For businesses operating in both Florida and Michigan — or across multiple states — the interaction between OBBB federal deductions and each state’s conformity or decoupling position creates a mosaic of state tax obligations that must be evaluated together, not jurisdiction by jurisdiction. Our financial advisory team coordinates this multi-state analysis for every client with cross-state filing obligations. Learn more on our advisory blog and explore our full suite of services at kal-onomato.com/services.
📜 Michigan’s Tax Changes Are Already In Effect — Every Quarter You Wait Compounds the Exposure
Manufacturers who have not yet modeled the Michigan decoupling impact on their 2025 tax position may be significantly underpaid — and the April 30, 2026 deadline to qualify for the penalty and interest waiver is fast approaching. Our SALT advisory team and financial advisory team are ready to help you quantify the exposure, correct the position, and build a forward-looking strategy that minimizes the ongoing cost of Michigan’s decoupling from federal rules. Schedule your free consultation today →
Frequently Asked Questions — Michigan Manufacturers
Is Your Michigan Manufacturing Business Ready for H.B. 4961?
Book a free 30-minute consultation with Kal. We will assess your 2025 Michigan tax position, quantify the bonus depreciation and R&D decoupling impact, identify any estimated payment underpayment exposure, and outline a clear, actionable strategy for minimizing the ongoing cost of Michigan’s departure from federal tax rules.
