Estimate your annual and monthly property tax based on your home's value, assessment ratio, and local tax rate.
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This calculator estimates property tax by first applying an assessment ratio to the property's market value to determine its assessed value — the figure tax authorities actually use for calculating tax, which in many jurisdictions is lower than full market value — then multiplying that assessed value by the local tax rate. The monthly figure shown is useful for anyone whose mortgage lender collects property tax through an escrow account, since it represents roughly how much of each monthly mortgage payment goes toward covering the annual tax bill. Both assessment ratios and tax rates vary substantially by location, sometimes even between neighboring municipalities, so checking your specific local tax assessor's published rate or your most recent tax bill will always give a more accurate figure than a generic estimate. Property tax bills can also change year to year even without a change in tax rate, simply because local governments periodically reassess property values, which is worth checking for whenever a notable jump appears on an annual bill.
Homeowners often assume their property tax bill is calculated directly from what their home would sell for on the open market, but in most tax jurisdictions, that's not quite right — the number that actually determines your tax bill is assessed value, a figure that's related to market value but frequently isn't the same thing at all.
Assessment ratio is the mechanism that creates this gap: many jurisdictions deliberately tax only a percentage of a property's estimated market value, rather than the full amount. A jurisdiction with a 50% assessment ratio taxing a home valued at $400,000 on the open market would calculate tax based on an assessed value of just $200,000, even though the two figures describe the exact same physical property. This isn't an error or a loophole — it's a deliberate policy choice baked into how the local tax rate itself gets set, since jurisdictions set rates knowing what assessment ratio they'll apply.
Some jurisdictions add another layer of complexity: assessment value caps that limit how quickly a property's assessed value can rise from year to year, even during periods when market values are climbing much faster. This is particularly relevant for long-term homeowners in rapidly appreciating markets, where the gap between capped assessed value and true current market value can grow substantial over years of ownership, effectively insulating existing owners from tax increases that new buyers (whose assessed value typically resets closer to actual purchase price) don't benefit from.
The monthly figure this calculator shows serves a specific practical purpose beyond simple curiosity: many mortgage lenders require borrowers to pay an estimated monthly share of their annual property tax into an escrow account, alongside principal and interest, then the lender pays the full annual tax bill on the homeowner's behalf when it's due. Understanding roughly what that monthly escrow contribution should be helps homeowners sanity-check their mortgage statement and anticipate how a tax reassessment might change their total monthly housing payment going forward.
Because both assessment ratios and tax rates are set locally and can differ meaningfully even between adjacent towns or counties, there's no substitute for checking your specific jurisdiction's current, published figures — a generic estimate is useful for budgeting and planning purposes, but your actual tax bill or local assessor's office will always have the authoritative numbers that apply specifically to your property.
Many tax jurisdictions apply an assessment ratio below 100% specifically to keep assessed values (and resulting tax bills) lower than full market value, and some jurisdictions also cap how quickly assessed value can increase year over year even if market value rises faster.
Many mortgage lenders collect an estimated monthly share of your annual property tax bill through an escrow account, then pay the full tax bill on your behalf when it's due, which is exactly what the monthly figure in this calculator estimates.
Check your local county or municipal tax assessor's website, or refer to your most recent property tax bill, which typically states both figures explicitly for your specific property.