Estimate annual property taxes from assessed value and local mill rates with homestead exemptions and appeal savings analysis.
A mill is one dollar of tax per thousand dollars of assessed value, so a 25-mill rate equals 2.5 percent of value, not 25 percent. This tool applies that conversion: you enter the property's assessed value, the mill rate your county and local taxing districts charge, and any homestead exemption you qualify for, and it estimates the annual tax bill. An appeal mode recomputes the bill at a lower assessed value so you can see what a successful challenge would save each year. The usual error is entering mills as a percentage, which inflates the estimate tenfold.
A concrete input and expected output from the current implementation.
Input
Assessed value $300,000; mill rate 25; homestead exemption $50,000; appeal target $275,000
Expected output
Annual tax $6,250 on a taxable value of $250,000. With the appealed assessment of $275,000, the tax falls to $5,625, saving $625 per year.
Taxable value is assessed value minus the exemption ($300,000 - $50,000 = $250,000). Dividing by 1,000 and multiplying by the mill rate gives 250 x 25 = $6,250; the same steps on the reduced assessment give 225 x 25 = $5,625, a difference of $625.
Tax is (assessed value minus homestead exemption) times the mill rate divided by 1,000. A mill is one dollar of tax per thousand dollars of taxable value, so the rate is entered as dollars per thousand, not as a percentage. The rate should be the combined total from every taxing authority that bills you: county, city or town, school district, and special districts like fire or sewer.
The appeal mode recomputes the annual bill at a lower assessed value and reports the difference as yearly savings. The mill rate and any exemption are held constant, so the saving is purely the assessment reduction applied to the same rate. Savings persist as long as the lower assessment holds, but filing fees, appraisals, and time should be weighed against the annual gain.
Convert first: mills are dollars per $1,000, so multiply a per-$100 rate by 10. A rate of $2.50 per $100 equals 25 mills, and a 1 percent rate equals 10 mills. If your statement lists separate rates for county, school, and special districts, add them together to get the combined mill rate the tool expects.
It estimates the base tax from the values you enter; escrow is roughly that annual figure divided by 12, plus a cushion the lender is allowed to hold, paid monthly and remitted by the lender. The actual bill can differ because rates or the assessment change during the year, or because charges such as special assessments or late fees are not part of this calculation.
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