How to Calculate Arizona Taxes When Selling Your Home

Gain is not what the house sold for; it is sale price, minus selling costs (which include any concessions and fees you paid), minus your adjusted basis: what you originally paid plus capital improvements over the years (the new roof, the AC replacement, the remodel, with receipts). A $500,000 sale of a home bought for $320,000 with $40,000 of documented improvements and $15,000 of selling costs is a $125,000 gain, not a $500,000 anything. Dig out the improvement receipts; every documented dollar of basis is a dollar never taxed.

If you owned the home and used it as your main residence for at least two of the five years before the sale, you can exclude up to $250,000 of gain filing single or $500,000 married filing jointly (IRS Topic 701), generally usable once every two years. That $125,000 gain from step one, on a qualifying primary residence: fully excluded, zero federal tax, zero Arizona tax, done. This is why most Arizona owner-occupants owe nothing, and the exclusion amounts remain unchanged by recent federal legislation, including the 2025 tax bill.

Gain above the exclusion (or on a non-qualifying home, like a rental or flip) is taxed. Federally: long-term capital gains rates if you held over a year (0%, 15%, or 20% by income), plus the 3.8% net investment income tax on gain above the exclusion if your income exceeds $200,000 single or $250,000 joint. Arizona: starts from federal numbers, so excluded gain never appears on your Arizona return at all; taxable long-term gain gets a 25% subtraction if you acquired the home after December 31, 2011 (A.R.S. § 43-1022), and the rest is taxed at the flat 2.5%. Net effect on post-2011 homes: about 1.875% to Arizona on the taxable portion, and the subtraction requires completing the return's worksheet lines, so do not let software skip them, and keep proof of your purchase date.

Arizona has no real estate transfer tax: the state constitution has banned taxing the sale or transfer of real property since 2008, so the line that costs sellers thousands in other states is $0 here, and recording the deed is a flat $30 statewide. Property taxes are billed in arrears with halves due October 1 and March 1, and escrow prorates them between you and the buyer at closing by custom, so expect a debit or credit for your ownership days, not a bill. And Arizona withholds nothing from sale proceeds, unlike California's 3.33% for some sellers; even nonresident sellers get their full proceeds and simply settle up at filing time.

At closing, the settlement agent may issue Form 1099-S reporting the sale; for a qualifying primary residence under the exclusion limits, you can sign a certification that usually means no 1099-S is filed at all. If you get one, report the sale even when the gain is fully excluded. Arizona filing: residents report through the normal return; part-year residents' Arizona taxability turns on whether they closed while an Arizona resident; nonresidents selling Arizona property file the nonresident return, since gain on Arizona real estate is Arizona-source income. Keep for your records: closing statements from purchase and sale, improvement receipts, and proof of your acquisition date for the 25% subtraction.