Michigan Tax Tribunal Income Tax Appeal

The situation

Linda, 67, is a retired GM assembly plant worker in Flint, MI. She receives three income streams: (1) GM pension: $58,000/year; (2) Social Security: $24,000/year; (3) IRA withdrawals: $32,000/year. Total income: $114,000.

Michigan Treasury issued a Final Assessment for 2023: $2,890 in additional Michigan income tax, the auditor's position: Linda's IRA withdrawals do not qualify for the full retirement income deduction available to taxpayers born before 1946 (Linda was born in 1956, placing her in the post-1952 birth-year tier under MCL 206.30). Under the post-1952 rules (as of 2023), Linda's retirement income deduction is more limited, she may deduct up to $20,000 as a single filer for qualifying retirement income rather than the unlimited deduction she claimed.

Linda has 60 days to either file Form 5713 (Treasury Informal Conference, NOT independent) or petition the Michigan Tax Tribunal (independent).

What Linda needs to understand: (a) Michigan's retirement income deduction is determined by birth year AND whether the taxpayer has reached age 67. Under the 2023 Michigan retirement income deduction rules: born 1946-1952 = graduated deduction; born after 1952 = limited deduction UNLESS the taxpayer has reached age 67, in which case different rules may apply (Michigan has been modifying these rules; H.B. 4001/4002, 2023, changed the retirement deduction structure effective for tax years 2023+). Linda needs to determine which deduction tier applies to her specific birth year and age. (b) Social Security income is NOT taxable in Michigan (unlike federal). The auditor may have incorrectly included Social Security in the income subject to Michigan tax. (c) The MTT is the better path than the Treasury Informal Conference. The Informal Conference is an internal Treasury review, not independent. The MTT provides genuinely independent review with qualified judges. Given that $2,890 is modest, the MTT Small Claims division (for disputes under $20,000) provides a simplified process. (d) The self-serve approach: Linda needs to determine her correct deduction tier, document her retirement income sources, and prepare the MTT petition.

Second portrait: Carlos, 46, owns a machining and fabrication shop in Grand Rapids, MI (Precision Parts Co. LLC). Michigan Treasury audited Carlos's 2022 Michigan income tax return and issued a Final Assessment for $11,400: the auditor disallowed $85,000 in business expense deductions that Carlos claimed on his Michigan Schedule C equivalent. Specifically: (a) $48,000 in equipment purchases, Michigan treats certain equipment differently from federal bonus depreciation (Michigan decoupled from federal bonus depreciation under MCL 206.30(b)); (b) $22,000 in subcontractor payments, Treasury claims insufficient documentation; (c) $15,000 in vehicle expenses, Treasury disputes the business-use percentage.

Carlos's defense: (a) Michigan equipment depreciation follows straight-line schedules for equipment not qualifying for federal bonus depreciation, Carlos needs to recalculate the allowable Michigan deduction using the Michigan depreciation schedule. (b) Subcontractor documentation: Carlos paid subcontractors via check with business expense categorization, he has bank records and work product but didn't issue all required 1099-NECs. (c) Vehicle expenses: Carlos used a vehicle log but it was partially reconstructed after the fact, he needs to provide contemporaneous trip records.

Who receives this

Michigan income tax filers who received a Michigan Treasury Final Assessment. Primary segments: (1) Retired auto industry workers and Michigan government/school employees with retirement income deduction tier disputes; (2) Self-employed Michigan workers with business deduction disputes (Michigan depreciation vs. federal bonus depreciation); (3) Detroit residents with city income tax disputes; (4) Part-year Michigan residents with income allocation questions. Scale: Michigan has 10M+ population; Detroit metro is home to the US auto industry's core workforce generating significant pension income.

Why the agency will not advise you

Michigan Treasury cannot advise taxpayers how to contest its own assessments. MTT is genuinely independent (MCL 205.701). Treasury Informal Conference = internal (not independent). 60-day MTT deadline. Michigan's unique retirement income deduction (birth-year tiers) creates a specific knowledge gap for Michigan retirees that a self-serve tool can address directly.

Key facts, with sources

• The Michigan Department of Treasury administers the Michigan Income Tax Act (MCL 206.1 et seq.). When a Treasury audit results in additional income tax, the Treasury issues a Notice of Intent to Assess and then a Final Assessment. The taxpayer has two paths: (1) File Form 5713 (Request for Hearing/Informal Conference) with the Treasury's Hearings Division within 60 days, the Hearings Division is an internal Treasury unit, NOT independent; OR (2) petition the Michigan Tax Tribunal within 60 days of the Final Assessment (or the Michigan Court of Claims within 90 days). The Michigan Tax Tribunal is an independent quasi-judicial administrative court established by MCL 205.701 et seq., it is separate from the Michigan Department of Treasury, the State Tax Commission, local units of government, and local boards of review. MTT judges are not Treasury employees; MTT decisions are reviewable by the Michigan Court of Appeals. Michigan's income tax structure: flat rate of 4.25% on taxable income. Michigan has several unique income provisions: (1) Retirement income deduction (MCL 206.30), Michigan's tiered retirement income deduction based on the taxpayer's birth year is among the most complex in the US: those born before 1946 may deduct ALL qualifying public/private pension income; those born 1946-1952 may deduct varying amounts based on age and whether they reached 67; those born after 1952 have different (more limited) deduction eligibility. Auditors frequently assess additional tax when they disagree with the taxpayer's deduction tier. (2) Michigan Business Income Tax, for self-employed individuals with Michigan business activity, there are specific Michigan income adjustments. (3) Detroit City Income Tax, Detroit residents pay an additional 2.4% city income tax (1.2% for nonresidents working in Detroit) with its own appeal process through the Detroit City Income Tax Hearings division. Source: Michigan Tax Tribunal · Michigan Treasury — Adjustment or Denial of Individual Income Tax Refund · Michigan Tribunal or Court of Claims — Michigan Treasury
• Michigan is the 10th most populous US state, with significant auto industry employment (Detroit metro), university employment (Ann Arbor/Lansing), and manufacturing (Grand Rapids, Flint). Michigan's retirement income deduction is a common audit issue because of the state's large retiree population (particularly former auto industry pensioners) and the complex tiered birth-year eligibility rules. A taxpayer claiming the wrong retirement income deduction tier can generate significant Michigan income tax deficiencies. epta.polterlaw.com provides Michigan property tax appeal tools, this is specifically for PROPERTY TAX (not income tax) and is not a competitor for income tax audit defense. Michigan income tax attorneys (Warner Norcross + Judd, Bodman PLC, Honigman) charge $3,000-$15,000 for MTT income tax proceedings. No self-serve Michigan income tax audit appeal preparation tool was found. Source: Michigan Tax Tribunal — Tribunal Operations FAQ · Direct Tax Relief — Michigan Tax Relief · Michigan Taxpayer Guide 2025 — Michigan Legislature

When to bring in a professional

Self-serve responses fit routine cases: clear facts, amounts a business can absorb, and a deadline still ahead of you. Bring in a licensed professional when the amount at stake is large relative to their fee, the facts are genuinely disputed, criminal exposure is possible, or the deadline has already passed. A short paid consultation to sanity-check your plan is often worth it even when you handle the filing yourself.

All sources for this guide

1. Michigan Tax Tribunal
2. Michigan Treasury — Adjustment or Denial of Individual Income Tax Refund
3. Michigan Tribunal or Court of Claims — Michigan Treasury
4. Michigan Tax Tribunal — Tribunal Operations FAQ
5. Direct Tax Relief — Michigan Tax Relief
6. Michigan Taxpayer Guide 2025 — Michigan Legislature