Michigan Bonus Tax Calculator
Data compiled and maintained by Edmond Daher · Updated 2026-06-16
Wondering why your Michigan bonus shrank so much? It's withholding, a flat prepayment, not a higher rate on bonuses. Michigan has no separate bonus rate, so it withholds using the aggregate method (about 4.25%) on top of the 22% federal prepayment and FICA. Drop your figures in to watch the payday deduction sit next to the real filing cost, plus whatever you get back or owe. Everything runs in your browser.
Short version: in Michigan, a bonus paid on its own is withheld at the flat federal 22%, no separate Michigan rate — it's withheld as ordinary wages (about 4.25%), and 7.65% FICA. Those are withholding rates, not the tax itself; your bonus settles at your marginal rate on your return — the tool below shows by how much.
Estimate only, not tax advice — terms.
Breaking down the withholding on a Michigan bonus
Where the 22% comes from. Employers may withhold a flat 22% of a separately identified bonus for federal income tax (IRS Publication 15). It rises to a mandatory 37% on any bonus dollars past $1,000,000 in a year — the third bracket's rate as a default, not a bonus tax.
Michigan: the aggregate method. Michigan publishes no separate bonus rate, so a bonus is withheld as if it were ordinary wages. Because Michigan taxes income at a flat 4.25%, a separately paid bonus is effectively withheld near 4.25%.
FICA is the real tax. Social Security (6.2% to the wage base) and Medicare (1.45%, +0.9% above $200,000) are owed at the same rate they're withheld. That's why the calculator shows the same FICA under "withheld now" and "what it really costs" — there's nothing to refund; only the income-tax portion trues up.
For your regular salary rather than a bonus, use the Michigan paycheck calculator.
Michigan bonus withholding at $5,000, $25,000 and $100,000
What's held back from three bonus sizes in Michigan (single filer, $70,000 salary):
| Bonus | Federal | Michigan | FICA | Total | % of bonus |
|---|---|---|---|---|---|
| $5,000 | $1,100 | $213 | $383 | $1,695 | 33.9% |
| $25,000 | $5,500 | $1,063 | $1,913 | $8,475 | 33.9% |
| $100,000 | $22,000 | $4,250 | $7,650 | $33,900 | 33.9% |
That percentage moves once Social Security caps out at the wage base, and the income-tax slice still settles at filing.
The "Michigan bonus tax" myth, and what's really withheld
The flat 22% federal figure (and your state's rate) is a withholding default — not a tax that applies only to bonuses. A bonus is ordinary income, taxed at your true marginal rate when the year runs through the brackets. When 22% overshoots your rate you're refunded; when it undershoots, the balance is due. Worked out for the $18,000 bonus here, about $550 returns as a refund. Only FICA (7.65%) is a true tax that never returns.
Bonus withholding in Michigan next to Ohio, Indiana and Wisconsin
A single filer earning $70,000 who gets a $10,000 bonus, in Michigan and neighboring Ohio, Indiana and Wisconsin:
| State | Bonus method | State withheld | Total withheld |
|---|---|---|---|
| Michigan | aggregate (~4.25%) | $425 | $3,390 |
| Ohio | flat 2.75% | $275 | $3,240 |
| Indiana | aggregate (~2.95%) | $295 | $3,260 |
| Wisconsin | graduated 3.54–7.65% | $530 | $3,495 |
Totals stack federal 22%, state, and FICA for a single filer — the actual income tax lands when the return is filed.
$61,000 salary, $18,000 bonus: the Michigan withholding-vs.-tax breakdown
Say you earn $61,000 in Michigan and your employer cuts a separate $18,000 bonus check:
- Off the top: $6,102 disappears at payday — $3,960 federal, $765 Michigan, and $1,377 FICA — so roughly $11,898 actually reaches you, a 33.9% cut.
- What it actually costs: the true income tax on the bonus is about $4,175 (federal $3,410 + Michigan $765), plus the same $1,377 FICA.
- The gap: the flat 22% over-shoots your real rate by about $550, so that much is a refund later. Either way, the $1,377 FICA is final and won't come back.
Example single-filer numbers from the calculator above; your own refund or bill shifts with your total income and filing status.
Michigan bonus tax FAQ
Does Michigan tax bonuses more than regular pay?
No. There's no separate, higher tax on bonuses — a bonus is just withheld at a flat rate up front, then taxed like any income at your marginal rate.
Does Michigan have a separate bonus withholding rate?
No. Michigan has no separate supplemental rate, so a bonus is withheld with the aggregate method — as if it were part of your regular wages, effectively near 4.25%.
What rate does Michigan withhold on a bonus in 2026?
Michigan's supplemental withholding is about 4.25% (aggregate method), added to the flat 22% federal prepayment (37% on bonus pay over $1,000,000/yr) and 7.65% FICA. Only the income-tax portion is a prepayment; it trues up at your real rate.
Will I get some of my Michigan bonus withholding back?
Often, yes — if your true marginal rate is below the 22% withheld, the difference refunds at filing; above 22%, you owe it. FICA is a true tax and never refunds.
Bonus tax calculators near Michigan
Michigan paycheck calculator · all state bonus tax calculators →
Sources
- IRS Publication 15 (2026) — Supplemental Wages (flat 22% / 37% above $1M)
- Michigan income-tax status & rate: see the Michigan paycheck calculator sources (state DOR, verified 2026-06-16).