Property Tax

Property tax assessment follows a multi-step process beginning with the local tax assessor determining the market value of each real estate parcel. Assessors use three primary valuation methods: the sales-comparison approach (analyzing recent sales of comparable properties), the cost approach (estimating replacement cost minus accrued depreciation), and the income approach (capitalizing net operating income for income-producing properties). Most jurisdictions reassess properties at regular intervals — commonly every one to five years — though some states, like California under Proposition 13, limit annual assessment increases to 2% regardless of market appreciation and reassess only upon change of ownership. The assessed value may equal 100% of market value or a fractional percentage specified by state law. For example, Georgia assesses property at 40% of fair market value, meaning a $300,000 home has a taxable assessed value of $120,000 before exemptions. The assessment ratio varies widely across states and is a critical factor in comparing property tax burdens across jurisdictions.

The tax rate, or millage rate, represents the sum of rates from multiple overlapping taxing authorities within the property's location. A typical suburban homeowner pays separate millage rates to the county, the city or township, the school district, and often several special districts (fire protection, water management, library district, community college district, or transit authority). The combined rate is expressed in mills, where one mill equals $0.001 per dollar of assessed value. A total millage rate of 28.5 mills means the owner pays $28.50 per $1,000 of taxable value, or 2.85% of assessed value. Property tax bills are typically due in two installments — most commonly in November and April — though schedules vary by state. Delinquent taxes accrue interest and penalties, typically 1% to 1.5% per month. If taxes remain unpaid for a statutory period (usually 1 to 3 years), the local government may place a tax lien on the property and eventually conduct a tax sale or tax foreclosure proceeding. Under RESPA, lenders require mortgage borrowers to fund an escrow account for property taxes, ensuring timely payment. RESPA mandates that escrow accounts cannot hold more than a two-month cushion above expected disbursements, preventing lenders from collecting excessive reserves from borrowers.

Property tax represents a significant and often underestimated component of total housing cost. According to the U.S. Census Bureau's 2024 American Community Survey, the average effective property tax rate across all U.S. counties is approximately 0.99% of home value, but this masks extreme variation. Homeowners in New Jersey pay an average effective rate of 2.23%, while those in Hawaii pay just 0.28%. On a $400,000 home, this difference is $8,920 versus $1,120 annually — a $650 per month difference in housing costs. Two borrowers with identical mortgage payments can have dramatically different total monthly obligations purely based on location. Lenders include property taxes in the monthly debt calculation when qualifying borrowers, specifically within the housing expense ratio (front-end DTI). Conventional underwriting guidelines from Fannie Mae and Freddie Mac typically cap the front-end ratio at 28% to 31% of gross monthly income. Higher property taxes reduce the mortgage payment a borrower can qualify for, as the tax component consumes a larger share of the allowable ratio. For example, a borrower earning $8,000 monthly with a 28% front-end limit has $2,240 available for PITI. In a low-tax area with $200 monthly taxes, they can afford a $1,730 principal and interest payment (approximately $288,000 mortgage at 6.5%). In a high-tax area with $700 monthly taxes, they can only afford a $1,540 P&I payment (approximately $243,000 mortgage at 6.5%) — a $45,000 reduction in purchasing power.

Property taxes also significantly impact refinancing decisions and escrow account management. When property taxes increase, lenders must perform an escrow analysis to determine if the current monthly escrow payment is sufficient to cover the upcoming tax bill. If a shortage exists, the lender offers the borrower two options: pay the shortage as a lump sum or spread it over the next 12 months through increased monthly payments. An escrow shortage can create an unwelcome increase in monthly housing costs, sometimes catching borrowers off guard. The Tax Cuts and Jobs Act of 2017 added complexity by capping the state and local tax (SALT) deduction at $10,000 for federal income tax purposes. This limitation disproportionately affects homeowners in high-tax states such as California, New York, New Jersey, Illinois, and Connecticut, where annual property taxes alone can exceed the $10,000 cap. For these homeowners, the effective after-tax cost of property taxes is higher than in previous tax regimes. Borrowers should research the property tax history of any home they consider purchasing, including recent assessment trends, upcoming bond measures, and available exemptions. Most counties provide online property tax search tools where you can look up a specific address to see current assessed value, tax amount, and payment history — valuable due diligence data for any home purchase decision.