Property Tax Calculator

How to Use

Enter your property's assessed value (not necessarily its market value, check your local tax assessment notice), any exemption amount you qualify for, and your local property tax rate as a percentage. The calculator subtracts the exemption from the assessed value first, then applies the rate to that taxable amount. The Taxable Value result shows exactly what figure the rate was actually applied to, useful for confirming your exemption was correctly subtracted before tax before you compare the result against an official bill.

How Property Tax Is Actually Calculated

Property tax follows a simple two-step formula once you have the right inputs: subtract any exemption from the assessed value to get the taxable value, then multiply that taxable value by the local tax rate to get the annual bill. The part that trips people up isn't the math, it's sourcing the right assessed value and rate, since neither is something you calculate yourself, both come from your local tax assessor's office and can be found on an official assessment notice or your jurisdiction's public property records lookup.

Worked Example: Applying a Homestead Exemption

Take a property assessed at 5,000,000, in a jurisdiction with a 1% tax rate and no exemption applied. Taxable value equals the full assessed value, 5,000,000, so annual tax comes to 5,000,000 × 1% = 50,000, or about 4,166.67 per month if budgeted evenly. Now suppose the owner qualifies for a 500,000 homestead exemption on their primary residence: taxable value drops to 5,000,000 − 500,000 = 4,500,000, and annual tax falls to 4,500,000 × 1% = 45,000, a 5,000 annual saving purely from applying an exemption the owner was already entitled to but might otherwise forget to claim. This is exactly why the exemption field matters as its own separate input rather than being folded into a lower rate, it represents a specific, claimable reduction rather than a general discount.

Assessed Value vs Market Value: Why They Rarely Match Exactly

It's a common assumption that assessed value simply equals what a property would sell for, but most jurisdictions calculate assessed value as some fraction or formula-adjusted version of market value, updated on a periodic cycle (annually, every few years, or triggered by a sale) rather than continuously. This means assessed value can lag noticeably behind a fast-moving local market in either direction, running below current market value in a rising market between reassessment cycles, or occasionally above it if the market has recently cooled since the last assessment. Always use the actual assessed value from your official tax notice in this calculator, not your own market-value estimate, since that's the figure your local tax authority actually applies the rate to.

Common Mistakes When Estimating Property Tax

The most frequent mistake is using a home's purchase price or a recent appraisal as a stand-in for assessed value, these can differ substantially, especially in jurisdictions where assessed value updates infrequently or uses a formula-based fraction of market value rather than tracking it directly. A second mistake is forgetting to apply an exemption the owner already qualifies for, effectively overestimating the tax bill. A third is confusing the tax rate's units, some jurisdictions quote a percentage directly, others quote a "mill rate" (tax per 1,000 of assessed value), which needs converting to a percentage (divide the mill rate by 10) before it can be used correctly in a percentage-based calculator like this one.

Frequently Asked Questions

What's the difference between assessed value and market value?

Market value is roughly what a property would sell for today. Assessed value is a figure set by a local tax assessor for tax purposes, and it's often a percentage of market value rather than an exact match, the relationship varies by jurisdiction.

What counts as an exemption?

Many jurisdictions offer exemptions that reduce the taxable value of a property, common examples include a primary residence (homestead) exemption, senior citizen exemptions, or veteran exemptions. Enter the total amount of any exemption you qualify for, or leave it at zero if none applies.

Why does property tax get billed annually while this tool also shows a monthly figure?

Most local governments assess and bill property tax on an annual (or sometimes semi-annual) cycle, not monthly. The monthly figure here is purely a planning convenience, dividing the annual bill by 12, useful for budgeting a consistent monthly amount to set aside, which is exactly what a mortgage lender does when it collects property tax through an escrow account alongside your regular mortgage payment.

Why did my property tax bill go up even though the tax rate didn't change?

The most common reason is a reassessment, local assessors periodically re-evaluate properties, and if your assessed value rose (often reflecting a rising local real estate market), the resulting tax bill rises too even at an unchanged rate, since tax is calculated as rate times assessed value. Losing or failing to renew an exemption you previously qualified for can produce the same effect, a higher taxable value even with the rate and market value both unchanged.

Does a higher assessed value always mean a higher property tax bill?

Generally yes, since tax is calculated directly from assessed value, but not always proportionally. Some jurisdictions cap how much assessed value (or the resulting tax bill) can increase year over year regardless of market changes, and some adjust the tax rate itself when overall assessed values across an area rise, to keep total collected revenue relatively stable. Check your local assessor's rules if you want to understand exactly how your specific jurisdiction handles this.

Can I dispute my property's assessed value if I think it's too high?

Yes, most jurisdictions have a formal appeals process, typically involving submitting comparable recent sale prices for similar nearby properties as evidence within a specific filing window after receiving your assessment notice. This calculator doesn't determine whether an assessed value is fair, it simply calculates the resulting tax from whatever value you enter, checking the assessed value itself against recent comparable sales is a separate, worthwhile step if a bill looks unexpectedly high.