Annual property tax calculator

Enter the rate as either mills or a percentage, and the calculator converts it to an effective decimal rate before multiplying it by the assessment. The result is rounded to cents and shows the original inputs alongside the normalized rate, making the calculation easy to check, explain, or reuse in an automated workflow. This is an estimate, not an official tax bill.

Start with the assessed value, not the sale price

Property tax is generally calculated from an assessed value supplied by a local assessing authority, which may differ substantially from a home's purchase price, listing price, replacement cost, or informal market estimate. Use the assessment that applies to the tax period you want to estimate. If a notice separates land and improvements but the local rate applies to both, add those assessed amounts before entering the value. The calculator requires the assessed value to be greater than zero because a zero or negative assessment cannot produce a meaningful estimate under this contract. It does not apply exemptions, assessment ratios, caps, credits, special district charges, delinquency penalties, or prorated ownership periods automatically. If any of those affect the property, adjust the assessment or rate only when local guidance explicitly tells you to do so. Keeping the source assessment beside the result makes later comparisons much easier when a new assessment notice or proposed budget changes the taxable amount.

Choose mills or percent carefully

Local authorities commonly publish property tax rates in one of two forms. A mill represents one currency unit of tax for every thousand currency units of assessed value, so 18.5 mills becomes 0.0185 as a decimal rate. A percentage represents tax per hundred units of value, so 1.85 percent also becomes 0.0185. Select the form that matches the source instead of converting it before entry; this reduces the chance of a tenfold error. The calculator divides a mill rate by 1,000 and a percentage rate by 100, then multiplies the result by the assessed value. A rate of zero is allowed and produces a zero estimate, while negative rates are rejected. When several taxing bodies publish separate rates that all apply to the same assessment, add rates expressed in the same unit first. If the authorities use different assessment bases or exemptions, calculate those portions separately rather than combining rates that do not share the same taxable value.

Interpret the annual estimate in context

The returned annual property tax is a straightforward arithmetic estimate rounded to two decimal places. It is useful for budgeting, comparing locations, checking an escrow projection, or testing the effect of a proposed rate, but it is not a promise of the amount a tax collector will bill. Actual bills may include exemptions, abatements, supplemental assessments, voter-approved levies, fixed fees, special assessments, rounding rules, and different effective dates. They may also split the annual liability into installments without changing the annual total. For a rough monthly housing budget, divide the annual estimate by twelve, while remembering that escrow providers can add cushions or recover shortages. Preserve the returned assessed value, entered rate, rate type, and effective rate with the estimate so another person can reproduce it. The browser calculation is free, while an API request is $0.002; both use the same deterministic formula and make no network requests. Confirm decisions involving a purchase, appeal, or payment against current records from the relevant local authority.