One of New England's steeper combined rates, and a real workaround.
Maine's top income tax bracket applies to capital gains the same way it applies to a paycheck, and at 7.15% it's one of the higher state rates an investor will run into. Add the federal 20% and the 3.8% NIIT and the combined total on a property sale reaches 31.0%.
The 31.0% figure comes from three layers stacking on top of each other: 20% federal, 3.8% NIIT, and 7.15% Maine state tax. None of those pieces move for an individual seller; they're set by statute, not negotiation.
Take a hypothetical $250,000 gain, purely for illustration, nothing to do with an actual transaction. At Maine's combined 31.0% rate, that works out to roughly $77,500 owed across federal, NIIT, and state. Run your real numbers, with depreciation recapture factored in, through the capital gains tax calculator instead of doing the arithmetic by hand.
None of that $77,500 is unavoidable if the property gets replaced rather than cashed out. A 1031 exchange defers the entire combined rate by rolling proceeds into a new investment property. Map the exchange in the 1031 exchange calculator and track your deadlines in the timeline calculator.