Calculation details
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What does this calculator estimate?
Property tax is a local tax on your property's assessed value, calculated at a local millage/rate. This calculator estimates the annual and monthly property tax from your assessed value and rate. Enter the assessed value, rate, and any exemptions to see it.
- Tax = taxable assessed value × rate
- Exemptions reduce the taxable value
- Annual tax ÷ 12 = monthly amount
How property tax works
Property tax is charged by local governments (county, city, school district) on your property's taxable assessed value. The assessed value is often a percentage of market value, and a tax rate (or millage) is applied. Exemptions (like a primary-residence credit) reduce the taxable amount.
Limitations to watch for
The assessed value is set by the local assessor and can differ from market value. Rates vary widely by locality and typically change yearly, so the estimate is only for the figures you enter. There may be additional charges (school, village, bonds) not captured by a single rate.
How to use it in practice
Use the estimate to budget the real monthly cost of a home (taxes are often escrowed into your mortgage payment). Know that a reassessment or a tax-rate hike can raise the bill, so leave room. Check your local assessor's exact rate and exemptions.
- Enter the assessed value.
- Enter the tax rate (percent).
- Optionally add exemptions/deductions; tax = taxable × rate ÷ 100.
How this calculator works
Formula
Property tax = (assessed value − exemptions − deductions) × tax rate ÷ 100, computed annually and divided by 12 for the monthly amount.
Worked example
An assessed value of $300,000 with a $25,000 exemption and a 1.25% rate: taxable = $275,000, annual tax = $275,000 × 0.0125 = $3,437.50, or about $286/month.
Assumptions to verify
- Assessed value and rate are entered by the user.
- Exemptions/deductions reduce the taxable value.
- The estimate is annual tax, divided by 12 for monthly.
Frequently asked questions
How is property tax calculated?
Property tax = (assessed value − exemptions) × tax rate ÷ 100, usually annual then divided by 12 for monthly.
What is the assessed value?
The value a local assessor assigns for tax purposes, which may be a percentage of market value. It can differ from what you paid or the current appraisal.
How do exemptions affect it?
Exemptions (like a homestead or primary-residence credit) reduce the taxable value before the rate is applied, lowering your bill.
Does property tax change every year?
Yes. Assessed values are recalculated periodically and local tax rates are set annually, so your bill can rise or fall. Budget for possible increases.
Why is my property tax higher than the estimate?
The assessor's valuation, the actual rate, or additional local levies (school, village, bond) can push it up beyond a single-rate estimate.
Is property tax included in my mortgage payment?
Often yes — many lenders escrow the property tax and insurance into your monthly payment, so it's paid alongside the mortgage. Check your escrow statement.
What is a millage rate?
A tax rate expressed in 'mills' per $1,000 of taxable value. A 12.5-mill rate equals 1.25%. It's the local government's way of stating the rate.
Cite this tool
BoringToolsKit. “Property Tax Calculator.” boringtoolskit.com/property-tax-calculator/ (reviewed 2026-08-25). Free to reference in articles, syllabi, and answer posts with a link.
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