RSU tax rate in Michigan: state, federal, and FICA on vest income

Searches for an RSU tax rate in Michigan usually mean you want one percentage to plan cash for a vest. Michigan applies a flat state income tax rate to taxable income including RSU vest wages per Michigan Treasury guidance for your filing year — simpler than progressive states like California or New York, but still stacked on top of federal tax and FICA.

Federal progressive income tax and FICA apply separately on vest FMV. FICA runs nationwide on vest wages with Social Security stopping at the annual wage base and Medicare applying to the full amount. Employer supplemental withholding on equity often uses flat federal methods that can under-withhold compared with your true stacked marginal rate on salary plus vest.

Detroit auto, tech, and healthcare RSU vests are the most common Michigan planning scenario. Michigan residents working in Detroit may face Detroit city income tax on wages including RSU vest FMV in addition to the flat state rate. Ann Arbor and suburban employees outside Detroit follow Michigan state tax without the city layer — but federal marginal tax and FICA still apply everywhere.

Moving from Michigan to Florida or Texas mid-year triggers a part-year Michigan return on pre-move connected income. Remote MI residents working for out-of-state employers still typically owe Michigan tax on vest wages as resident income. Estimated federal tax may be needed even when Michigan flat state withholding is accurate at the state layer.

The practical planning number is a combined estimate: Michigan flat state rate per current Treasury publications times estimated taxable income, plus any Detroit city tax if applicable, plus federal marginal rate plus remaining FICA on the vest FMV. Use the Michigan RSU tax guide for mechanism detail and the RSU tax calculator with Michigan selected for a stacked-income estimate.

• ✓MI state withholding on vest pay stub.
• ✓Detroit city withholding if applicable.
• ✓W-2 MI wage and tax boxes.
• ✓Federal Box 1 and withholding.
• ✓MI tax estimate with total income for filing year.
• ✓Federal withholding gap vs marginal rate.
• ✓Move date if part-year MI.

• ✓MI vest pay stub.
• ✓W-2 MI boxes.
• ✓Vest confirmation.
• ✓MI estimated tax if made.
• ✓Move docs if part-year.

• ✓Detroit city tax on large vest.
• ✓Part-year MI resident with large equity income.
• ✓Employer withheld wrong state on MI resident vest.
• ✓Multi-state remote work allocation.