Property tax is the local tax on owning real property, and it is computed in five steps: valuation, assessment, levy, rate, and bill. This guide works through each step, explains why the rate absorbs a rising assessment when the levy is held, sets out the exemptions and circuit-breaker relief that reduce the burden, and shows how to appeal an assessment on evidence and budget the bill through escrow.

What property tax is, and who levies it

Property tax is an annual tax on the ownership of real property — land and the buildings on it — levied by local government: the county, the city, the school district, and the special districts that provide water, fire protection, libraries, and other local services. It is the oldest major tax in the United States, and it remains the largest single source of revenue for most local governments, which is why it is also the tax most directly connected to the services the taxpayer sees: the roads, the schools, the police and fire departments, and the parks are funded, in large part, by the property tax bills of the people who live near them. The tax is not a federal tax and it is not a state income tax; it is local, it is annual, and it is charged on the value of the property, whether or not the property produces income, and whether or not the owner can afford it from current earnings — a feature that makes it both stable for the government and burdensome for owners on fixed incomes, and that drives most of the relief programmes described later in this guide.

The tax is levied by overlapping jurisdictions, each with its own rate, and the bill is the sum of the levies: the county’s rate plus the city’s rate plus the school district’s rate plus each special district’s rate, all applied to the same assessed value. A homeowner’s bill therefore has several lines, each from a different body, and the total rate — the sum of the overlapping rates — is the figure that matters for the calculation, even though no single body sets it. The assessment, the rates, and the collection are usually administered by the county: the assessor values the property, the governing bodies set the rates, and the treasurer or collector issues the bill and collects it, often in two instalments a year. The property owner deals with the county for the value, with each jurisdiction for the rate, and with the collector for the payment — three relationships, one bill.

Assessment: how the value is decided

Assessment is the process of deciding the taxable value of a property, and it is the most consequential step in the calculation, because the tax is a rate times a value, and the value is the larger and more contestable of the two. The assessor values property at its market value — what it would sell for between a willing buyer and a willing seller — as of a valuation date set by law, using one of three approaches: the sales comparison approach, which values the property by comparison with recent sales of similar properties; the cost approach, which values the land plus the cost of replacing the building, less depreciation; and the income approach, which values income-producing property by capitalising its rental income. Residential property is usually valued by sales comparison; commercial property by income or cost; and unique properties by cost, because there are no comparable sales to compare with.

Assessment is not continuous: properties are reassessed on a cycle — annually in some jurisdictions, every few years in others — and between reassessments the assessed value may be trended, capped, or held, under rules that vary by state. Some states cap the annual increase in assessed value, so that a property’s assessed value lags its market value in a rising market and the lag accumulates over years; some reassess on sale, so that a new buyer’s assessed value jumps to the purchase price while a long-held neighbour’s stays low; and some assess at a fraction of market value — an assessment ratio — so that a property with a market value of $300,000 and a ratio of 80% has an assessed value of $240,000, and the rate is applied to the $240,000. The assessment notice, sent before the bill, is the document to check: it states the assessed value, the basis of the valuation, and the appeal deadline, and the appeal is the owner’s remedy where the value is wrong, not the bill, which merely applies the rate to the value.

Rates and levies: how the rate is set

The rate — usually expressed in mills, where one mill is one dollar per thousand dollars of assessed value, or as a percentage — is set by each taxing jurisdiction through its budget process. The jurisdiction decides how much revenue it needs from property tax — the levy — and divides the levy by the total assessed value of all taxable property in the jurisdiction to get the rate. The rate therefore falls when values rise and the levy is held, and rises when values fall and the levy is held: the levy is the decision, the rate is the arithmetic, and a rising assessment does not necessarily mean a rising bill, because the rate adjusts to the total base. A homeowner whose assessment rises faster than the jurisdiction’s average will pay a larger share of a levy that may be unchanged; a homeowner whose assessment rises slower will pay a smaller share. The bill is a share of a total, not a price per property, and the comparison that matters is the property’s assessment against the jurisdiction’s average, not the assessment alone.

Rate limits constrain the process in many states: caps on the total rate, caps on the annual increase in the levy, and voter-approval requirements for increases above a threshold all limit what a jurisdiction can levy, and they shift the burden between classes of property — residential, commercial, agricultural — where the limits apply differently. The effective rate — the tax actually paid divided by the market value — is the figure for comparing jurisdictions, because the nominal rate, the assessment ratio, and the exemptions all intervene between the market value and the bill. A jurisdiction with a high nominal rate and a low assessment ratio may levy less than a jurisdiction with a low nominal rate and full-value assessment, and a comparison that uses only the nominal rate misleads in either direction. The effective rate, computed from the bill and the market value, is the honest comparison, and it is the figure this guide uses whenever jurisdictions are compared.

The five steps from market value to bill. The assessment and the levy are the two decisions; the rate and the bill are arithmetic consequences of them.

A worked example, end to end

Take a house with a market value of $350,000 in a jurisdiction with an assessment ratio of 90%, a homestead exemption of $25,000, and a total rate of 18 mills — $18 per $1,000 of assessed value. The assessed value is $350,000 × 90% = $315,000. The exemption removes $25,000, leaving a taxable value of $290,000. The tax is $290,000 × 0.018 = $5,220 a year, payable in two instalments of $2,610. The effective rate — the tax divided by the market value — is $5,220 ÷ $350,000 = 1.49%. Now suppose the market value rises 10% to $385,000, the assessment rises with it to $346,500, the exemption stays $25,000, and the levy is unchanged, so the total rate falls to 16.4 mills: the tax is $321,500 × 0.0164 = $5,273, a rise of $53, not the $522 the 10% rise in value would suggest. The rate absorbed the rise, because the levy, not the value, decides the total collected. And suppose instead the assessment is capped at a 3% annual increase while the market rises 10%: the assessed value is $324,450, the taxable value $299,450, and the tax at the unchanged 18 mills is $5,390 — higher than the levy-held case, because the cap protects the individual assessment but the rate is set from the capped total base, and the interaction of caps and rates is jurisdiction-specific in ways a single example cannot capture. The figures are illustrative; the structure — value, ratio, exemption, rate, bill — is the method, and the jurisdiction’s own figures must be substituted at each step.

Exemptions and relief: homestead, senior, and circuit-breakers

Most states provide exemptions that reduce the taxable value for certain owners or properties. The homestead exemption — a fixed amount removed from the assessed value for an owner-occupied primary residence — is the commonest, and it is worth a fixed saving equal to the exemption times the rate, whatever the property’s value. Senior and disability exemptions remove a further amount, or freeze the assessed value, for owners above an age or with a disability, subject to income limits that vary by jurisdiction. Veterans’ exemptions, agricultural exemptions, and exemptions for non-profit and religious properties each remove a class of property or owner from the base, and each shifts a share of the levy onto the remaining taxpayers, which is why exemptions are debated as policy: every exemption is a transfer, and the transfer’s size is the exemption times the rate, paid by everyone else.

Circuit-breaker programmes — named for the electrical device that trips when the load is too great — limit property tax to a percentage of the owner’s income, refunding or crediting the excess, and they are the principal relief for owners on fixed incomes whose property values have risen faster than their incomes. The relief is usually claimed on the income tax return, as a credit or a refund, rather than as a reduction in the bill, and it is means-tested, so that the relief goes to the owners whose tax burden is high relative to their ability to pay. A senior homeowner whose bill has doubled while their income stood still should check the circuit-breaker before appealing the assessment: the assessment may be correct, and the relief may be the remedy, because the problem is the burden, not the value.

Appealing an assessment

An assessment appeal is a valuation dispute, and it is won with evidence, not with argument about the tax. The evidence is comparable sales: recent sales of similar properties, in the same area, adjusted for differences in size, condition, age, and features, showing that the assessed value exceeds the market value. The assessor’s own comparable sales, stated on the assessment notice or available on request, should be checked first: a comparable that is not comparable — a renovated house compared with an unrenovated one, a larger lot compared with a smaller — is the commonest error, and it is corrected by presenting better comparables, not by complaining about the bill. The appeal is filed by the deadline on the notice, heard by the board of review or the equivalent body, and decided on the evidence presented; a further appeal to the courts is available, at greater cost, where the board’s decision is disputed. The appeal does not suspend the bill: the tax must be paid while the appeal is pending, and a successful appeal produces a refund or a credit, not a waiver of the payment.

The decision to appeal should be made on the arithmetic: the saving is the overvaluation times the rate, per year, for the years until the next reassessment, and the cost is the time and any fee for the appeal, plus the cost of evidence — an appraisal, where the amount justifies it. An overvaluation of $20,000 at 18 mills saves $360 a year; over a three-year cycle it saves $1,080, and an appraisal costing $400 pays for itself. An overvaluation of $5,000 saves $90 a year, and the appeal is worth making only if the evidence is already in hand. The assessment cycle matters too: an appeal filed just before a general reassessment may be overtaken by the reassessment, while an appeal filed just after one has the full cycle to run. Check the cycle, check the deadline, and appeal on comparables, not on the size of the bill.

Escrow, budgeting, and the monthly cost

Most mortgaged homeowners pay property tax through escrow: the lender collects one-twelfth of the estimated annual tax with each monthly mortgage payment, holds it, and pays the tax bill when it falls due. The escrow amount is an estimate, reconciled annually, and a rise in the assessment or the rate produces an escrow shortage — a higher monthly payment, plus a catch-up for the shortfall — that surprises homeowners who think of the mortgage payment as fixed. The escrow statement, sent annually, is the document that explains the change: it shows the tax paid, the tax estimated, the balance held, and the new monthly amount, and it should be read when it arrives, not filed. A homeowner without a mortgage pays the bill directly, in the instalments the jurisdiction allows, and must budget the annual amount from monthly income — the monthly cost is the annual bill divided by twelve, held in a separate account, so that the instalment months do not produce a cash crisis.

Property tax is deductible for federal income tax purposes, as an itemised deduction, up to the cap on state and local tax deductions, and the deduction is claimed in the year the tax is paid, not the year it is assessed. A homeowner who itemises should therefore count the property tax, with the state income tax, against the cap, and compare the itemised total with the standard deduction before assuming the property tax saves tax. The saving, where the cap is not binding, is the tax times the marginal rate; where the cap binds, the additional property tax saves nothing, and the effective cost of the property tax is the full bill. The deduction is a feature of the income tax, not of the property tax, and it should not be counted in the property tax calculation itself, only in the after-tax cost of owning the property.

Renters, businesses, and the tax that is not on the bill

Renters do not receive a property tax bill, but they pay property tax indirectly: the landlord’s tax is a cost of the property, and it is recovered in the rent, together with the other costs of ownership. A renter’s rent therefore contains a property tax component, and a rise in the landlord’s tax is a pressure on the rent at the next renewal, mediated by the rental market and by any rent controls that apply. Some states recognise the incidence directly, with a renter’s credit on the income tax return — a circuit-breaker for renters, computed as a percentage of rent deemed to be property tax — and a renter in such a state should claim it, because it is the property tax relief designed for the taxpayer who pays the tax without receiving the bill.

Business property is assessed under the same system, usually at the same rate, but with the income approach to valuation and with the tax treated as a business expense, deductible in arriving at business profit. The burden of business property tax falls, in the end, on the customers, the employees, or the owners, depending on the market, and the incidence debate for business property is the local version of the national debate about corporation tax: the legal payer is the owner, and the economic payer is whoever cannot avoid the cost. The calculation, however, is the same five steps — value, assessment, levy, rate, bill — and a business owner who understands the steps can check the assessment, appeal it on comparables, and budget the bill, in exactly the way a homeowner does, with the same evidence and the same deadlines.

Frequently asked questions

How is property tax calculated?

Taxable value times the total rate. The assessor estimates market value, applies the assessment ratio to give assessed value, subtracts exemptions such as the homestead exemption to give taxable value, and each overlapping jurisdiction — county, city, school district, special districts — applies its rate to that value. The bill is the sum of the levies, usually payable in two instalments. The rate is set from each jurisdiction’s levy divided by its total assessed value, so a rising assessment does not necessarily mean a rising bill.

What is an assessment ratio?

The fraction of market value that is taxed. A property with a market value of $300,000 and an assessment ratio of 80% has an assessed value of $240,000, and the rate is applied to the $240,000. The ratio is set by state law, and it is why the nominal rate alone cannot be compared between jurisdictions: the effective rate — tax divided by market value — is the honest comparison.

What is a mill rate?

A mill is one dollar of tax per thousand dollars of assessed value, so a rate of 18 mills is $18 per $1,000, or 1.8%. The rate is set by dividing each jurisdiction’s levy — the revenue it needs from property tax — by the total assessed value of all taxable property in the jurisdiction. The total rate on a bill is the sum of the overlapping jurisdictions’ rates.

How can I appeal my property tax assessment?

File an appeal by the deadline on the assessment notice, with evidence: recent sales of comparable properties, adjusted for differences, showing the assessed value exceeds market value. The appeal is decided on the evidence by the board of review. The tax must still be paid while the appeal is pending; a successful appeal produces a refund or credit. The saving is the overvaluation times the rate, per year until the next reassessment, so weigh it against the cost of evidence such as an appraisal.

Are there exemptions that reduce property tax?

Yes. The homestead exemption removes a fixed amount from the assessed value for an owner-occupied primary residence. Senior and disability exemptions remove a further amount or freeze the value, subject to income limits. Circuit-breaker programmes limit property tax to a percentage of income, refunding or crediting the excess, usually claimed on the income tax return. Each exemption shifts a share of the levy onto the remaining taxpayers.

Do renters pay property tax?

Not directly — they receive no bill — but they pay it indirectly, because the landlord’s tax is a cost recovered in the rent. A rise in the tax is a pressure on rent at renewal. Some states provide a renter’s credit on the income tax return, computed as a percentage of rent deemed to be property tax, which a renter in such a state should claim.