Property tax calculator: estimate annual tax from assessed value, rate, and homestead exemptions to budget your yearly housing cost. Free, private, no signup.
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$300k assessed, $25k exemption
What this means for your numbers: The $25,000 exemption in the worked example saves $312.50/year. Each 0.1% rate increase on the taxable base adds $275/year: reassessment, not the rate, is usually the bigger mover.
Illustrative breakdown using the worked example above. The calculator computes your own numbers with the same formula.
A worked example, step by step
Say your home's assessed value is $350,000, the local rate is 1.2%, you qualify for a $25,000 homestead exemption, and you deduct a $5,000 veteran exemption. The calculator first finds taxable value: 350,000 minus 25,000 minus 5,000 equals $320,000. It floors at zero, so if your exemptions ($30,000 combined here) ever exceeded the assessed value, no negative tax would appear.
Next it applies the rate. $320,000 times 1.2 percent equals $3,840 per year. Dividing by 12 gives a monthly equivalent of $320.00. Both figures print with US currency formatting, and the annual figure is the one most lenders use when they split your tax into escrow payments. Note the order matters less than you might think: because both exemptions subtract before the rate applies, every $1,000 of exemption you qualify for saves exactly $12 per year at this rate, not $1,000.
Where estimates diverge from the bill
Real tax bills often differ from this estimate in three measurable ways. First, assessment ratios: many states assess only a fraction of market value, so a $400,000 house might carry a $160,000 assessed value at a 40 percent ratio. If you enter market value instead of assessed value, the error is enormous; check the assessed figure on your latest notice, not the Zestimate.
Second, millage quirks. A 'mill' is $1 of tax per $1,000 of value, so a 12-mill rate equals 1.2 percent and converts directly into this calculator. But some jurisdictions set separate millages for school, county, and fire districts that each round differently, and special assessments for sidewalks or stormwater are flat fees that never scale with the rate. Third, exemption phase-outs: a homestead exemption worth $25,000 on a primary residence can drop to zero for rentals or second homes. In one real pattern, Florida's Save Our Homes cap limited assessed growth to 3 percent while market values rose 15 percent in a year, so a buyer who paid $500,000 could face taxes based on a much higher reassessed value than the $380,000 the prior owner's bill showed. Recalculate after your first notice each year.
