Property Taxes

Property tax assessment and collection follows a multi-step process that begins with the local tax assessor determining the market value of each parcel of real estate within their jurisdiction. Assessment methods vary by state and locality. The most common approach is the sales-comparison method, where the assessor analyzes recent sales of comparable properties to estimate fair market value. Some jurisdictions use the cost method (estimating replacement cost minus depreciation) or the income method (capitalizing net operating income for rental properties). Most states require reassessment at regular intervals — commonly every one to five years — though some jurisdictions reassess only upon a change of ownership (as in California under Proposition 13, which limits annual assessment increases to 2% regardless of market appreciation). The assessed value may equal 100% of market value or a fractional percentage specified by state law. For example, in Georgia, property is assessed at 40% of fair market value, so a $300,000 home would have a taxable assessed value of $120,000 before exemptions.

The tax rate is expressed in mills, where one mill equals $0.001 per dollar of assessed value. A combined tax rate of 25.5 mills means the owner pays $25.50 per $1,000 of taxable value. The total millage rate is the sum of rates from multiple overlapping taxing authorities: the county, city or township, school district, and special districts (such as fire protection, water management, or community college districts). Property tax bills are typically due in two installments (many states use November and April due dates), and delinquent taxes accrue interest and penalties — often 1% to 1.5% per month. If taxes remain unpaid, the local government may place a tax lien on the property and eventually foreclose through a tax sale proceeding. Lenders protect their interest by requiring borrowers to maintain escrow accounts for property taxes, which ensures taxes are paid from the escrowed funds when due. RESPA mandates that escrow accounts cannot hold more than a two-month cushion in addition to expected disbursements, protecting borrowers from excessive escrow balances.

Property taxes represent a significant and recurring homeownership cost that can substantially affect housing affordability. According to the U.S. Census Bureau, the average effective property tax rate across all U.S. counties is approximately 0.99% of home value, but this varies dramatically by location. 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, the difference between these extremes is $8,920 versus $1,120 annually — a $650 per month difference in housing costs. This means two borrowers with identical mortgage payments can have vastly different total monthly housing obligations depending on where they live. When qualifying for a mortgage, lenders include property taxes in the monthly debt calculation — specifically in the housing expense ratio (front-end DTI). Higher property taxes reduce the mortgage payment you can qualify for, as the tax portion counts toward the 28% to 31% front-end ratio limit typically used in conventional underwriting guidelines published by Fannie Mae and Freddie Mac.

Property taxes also affect refinancing considerations. A borrower whose property taxes have increased significantly since purchase may find that their tax escrow shortage requires a larger upfront payment at refinancing closing. Additionally, property tax increases can cause escrow shortages even without refinancing — when taxes rise, the lender recalculates the monthly escrow payment and may require the borrower to pay the shortage over a specified period (typically 12 months) or as a lump sum. The Tax Cuts and Jobs Act of 2017 created additional complexity by capping the state and local tax (SALT) deduction at $10,000 for federal income tax purposes, meaning borrowers in high-tax states like California, New York, and Illinois may no longer receive a full tax benefit from their property tax payments. Understanding your local assessment cycle, exemption eligibility, and appeal rights is crucial for managing this ongoing cost effectively.