Michigan brokerage account growth calculator

What a taxable index-fund account is actually worth after expense-ratio drag and after Michigan takes its share of the gain — which, in most states, is not at the federal preferential rate.

Michigan taxes your gains as ordinary income

There is no state equivalent of the federal preferential rate here — a long-term gain is charged at Michigan's normal income brackets, exactly like wages. This is the common case, and it surprises people who assume the federal 15% carries over. No preferential rate. MCL 206.30(1) defines Michigan taxable income as federal AGI subject to a closed, enumerated list of adjustments, and no subdivision provides any capital-gains exclusion, preferential rate, or holding-period distinction; MCL 206.51 contains no capital-gains rate at all. Long-term and short-term gains are taxed identically at the flat 4.25%. Form MI-1040D exists only for narrow basis adjustments — the MCL 206.271 election for property acquired before 1972, and Michigan/federal basis differences — not for rate treatment. ONE NARROW EXCEPTION: MCL 206.30(1)(p) gives filers born before 1946 a combined dividend, interest and capital-gains subtraction, which was $14,688 single / $29,376 joint for 2025, reduced by military, railroad, and retirement subtractions. The 2026 amount is not yet published and is deliberately not estimated here.