Property Tax Calculator

About the Property Tax Calculator

Property tax is the largest single tax most homeowners pay. It funds local schools, roads, fire and police. Rates vary wildly by state and by jurisdiction within a state — the same house can have a $4,000 or $14,000 annual bill depending on the zip code. This page explains how the calculation works and how to challenge an assessment that seems wrong.

The Formula

Annual property tax = Assessed value × Mill rate (or tax rate as a percentage). Mill rate is 'per $1,000 of assessed value' so 20 mills = 2.0%. Most jurisdictions assess at 80-100% of market value.

Worked Example

Home market value $400,000, assessed at 90% ($360,000). Local mill rate 25 mills = 2.5%. Annual tax = $360,000 × 0.025 = $9,000, or $750/month. If a state caps tax growth at 3%/year (e.g. California's Prop 13), future years rise predictably regardless of market value.

How assessments work

Assessors set a 'taxable value' periodically — annually in some states, every 3-5 years in others. The taxable value is supposed to reflect market value but often lags by months or years. In hot markets your assessed value catches up after a 1-2 year delay; in falling markets you may overpay until reassessment.

How to challenge your assessment

Most jurisdictions allow appeals within 30-60 days of receiving your annual assessment notice. The strongest evidence: 3-5 recent comparable sales of similar homes nearby that sold for less than your assessed value. Photos of structural issues (foundation, roof) also help. Success rates are 30-50% when comps are clearly in your favour.

Escrow accounts and tax bills

Most lenders escrow property taxes — collecting 1/12 of the annual bill with each mortgage payment, holding it, and paying the tax bill when due. This is convenient but creates 'escrow shortage' surprises when taxes rise faster than the lender projected. You can request to pay taxes yourself if you have 20%+ equity.

Common Mistakes

• Assuming the listed property tax in a real-estate listing applies to you. New owners are often reassessed at the sale price, raising the tax bill.
• Missing the appeal deadline. Most jurisdictions give 30-60 days from the notice date — set a calendar reminder.
• Not factoring property tax into the buy decision. A 2% tax rate on a $500,000 home is $10,000/year — more than the mortgage interest in later years.

Frequently Asked Questions

Are property taxes deductible?
Yes, but capped at $10,000 combined with state income tax under the SALT cap (federal, 2018-2025).

What if my taxes triple after I buy?
Many states reassess on sale to the purchase price. Always check whether the listed taxes are based on the prior owner's assessed value.

This calculator is for informational purposes only and does not constitute financial, tax, or legal advice. Consult a licensed professional before making significant financial decisions.