Property Tax Rate Calculator

Your property tax bill comes down to two numbers: what the assessor says your home is worth, and the rate your local government charges. This property tax rate calculator turns those into an annual bill, a monthly escrow figure, your effective tax rate, and the mill-rate equivalent, then grades your rate against the national picture. It also works in reverse: enter a tax bill to find the true rate you are paying.

Quick Answer

Assessed value is not market value

This is where most estimates go wrong. Your tax bill is assessed value x tax rate, and assessed value is market value times the local assessment ratio. Many states assess at 100% of market value, but Connecticut assesses residential property at 70%, and some jurisdictions reassess only every few years, so the assessed number can sit well below what the home would sell for. In the example, a 100% ratio makes assessed and market value the same $450,000, but at a 70% ratio the same home would be assessed at $315,000 and the bill would fall to $3,465 even with the same 1.1% rate. Always start from your assessment notice, not a listing site.

Because lenders collect property tax monthly through escrow, the monthly figure matters as much as the annual one. Our mortgage payment calculator shows how that $412.50 stacks onto principal and interest each month.

What your rate means: low, typical or high

The national median effective property tax rate sits near 1.1% of home value, but the spread is enormous:

The table below puts the same $450,000 home in several states so the gap is concrete rather than abstract.

The same $450,000 home costs $1,440 a year in Hawaii and $9,945 in New Jersey: a $8,505 annual gap driven entirely by local rates. The calculator’s verdict badge grades your effective rate against this scale: under 0.8% is low, 0.8 to 1.5% is typical, and above 1.5% is high.

Mill rates, percentages and the reverse calculation

Some towns quote the rate as a mill rate: dollars of tax per $1,000 of assessed value. One mill equals 0.1%, so a 1.1% rate is 11 mills and the example home pays $11 per $1,000 of assessed value. The calculator shows both, so whichever format your bill uses, you can enter it.

The reverse calculation is just as useful. If you know the bill but not the rate: rate = (tax bill / assessed value) x 100. A $6,000 bill on a $400,000 assessed value is a 1.5% rate. This is the number to compare when shopping neighborhoods, because two towns can quote similar-looking rates while assessing very differently. Note that income-tax style brackets do not apply here; property tax is a flat rate on value, unlike the marginal rates in our tax rate calculator.

Exemptions and credits: a dollar off the bill, not off the value

The exemptions field on this tool is a dollar-per-year credit, and that distinction is worth getting right because it changes the answer by hundreds of dollars. The tool’s formula is: tax = (assessed value x rate / 100) minus exemptions, with the result never below zero. Take the worked example and add a $500 yearly credit: $4,950 minus $500 is $4,450 a year, or $370.83 a month. That is the full $500 saved. Contrast that with a tool that subtracts the exemption from the value before applying the rate: on the same home, ($450,000 minus $500) x 1.1% is $4,944.50, a saving of only $5.50. Both methods are used by real calculators, so the right entry depends on what your jurisdiction actually grants. If your bill shows a homestead, senior or veteran amount as a credit against the tax itself, enter it here. If your jurisdiction instead reduces the taxable value, that reduction belongs in the assessed value, not in this field: use the assessment ratio and the value on your notice to arrive at the assessed figure, and leave this field at zero unless a separate yearly credit also applies. Property taxes are generally deductible for itemizers subject to the federal SALT cap, and how that deduction interacts with mortgage interest is covered by our mortgage interest deduction calculator; check the current IRS limits before planning around the deduction.

What rival calculators get wrong

The generic property tax calculators ranking today do the basic multiplication fine but leave the useful questions unanswered. Most take a home value and a rate and stop: no assessment ratio, no mill-rate conversion, no effective-rate framing, and nothing that tells you whether your rate is good or bad. This calculator adds the verdict badge against the national median, the state comparison table, the mill-rate equivalent, and the reverse-rate formula, so the result answers “what do I owe” and “is that normal” in one pass. One honest gap to note: some calculators let you enter a mill rate directly, while this tool takes a percentage rate and converts it to mills in the results. If your bill quotes mills only, divide by 10 first (11 mills becomes 1.1%) and enter that percentage.

The verdict badge deserves one caution of its own: it grades the effective rate, not the nominal rate on your bill, and the two can look very different in a low-ratio state. Take a town quoting 28.47 mills. As a percentage of assessed value that is 2.847%, which sounds high. On a home assessed at 70% of market value, however, the effective rate on the full market value is 2.847% times 70%, or about 1.99%: still above the typical band, but a full eight-tenths of a point below the nominal figure. That is exactly why the tool shows both numbers and why the reverse calculation matters: comparing nominal rates across towns with different assessment ratios compares different things, while comparing effective rates compares the same thing. If your town reassesses infrequently, the same caution applies in the other direction: an assessed value that lags a rising market will flatter your effective rate until the next reassessment catches up, so treat a low verdict as a snapshot of the current assessment, not a permanent rate.

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