1099 Quarterly Taxes in Michigan (2025-2026)
If you're self-employed in Michigan — freelancer, contractor, gig worker, or single-member LLC — you owe quarterly estimated taxes to two agencies: the IRS (federal) and Michigan Department of Treasury (state). Michigan uses a flat 4.25% income tax, which makes estimating your state burden simpler than progressive states. But you still need to send the money on time to avoid underpayment penalties.
Michigan state income tax (2025)
Michigan uses a flat income tax rate of 4.25% on all taxable income above the standard deduction. There are no brackets — every dollar of taxable income is taxed at the same rate.
How to pay Michigan estimated taxes
Federal estimated tax due dates (April 15, June 16, September 15, 2026, and January 15, 2027) apply to your Michigan state estimated payments as well — most states piggyback on the federal schedule. Pay Michigan taxes through the Michigan Department of Treasury's online portal: mto.treasury.michigan.gov. You can also mail Form MI-1040ES with a check.
Michigan-specific quirk freelancers miss
Michigan flat-tax rate is 4.25%. Several major Michigan cities (Detroit, Grand Rapids, Lansing) levy additional city income taxes — Detroit residents pay 2.4% on top of state, non-residents working in Detroit pay 1.2%.
Common deductions for Michigan freelancers
- Michigan allows the same business expenses (home office, mileage, software, etc.) as federal.
- Half of SE tax is deductible federally; check Michigan's rules for state conformity.
- MI conforms to federal QBI from federal AGI.
- SEP-IRA / Solo 401(k) contributions reduce both federal and Michigan taxable income.
- Self-employed health insurance premiums are deductible federally.