Property Taxes Explained
Property Taxes Explained
Property taxes fund local schools, roads, and government services. They're calculated by multiplying your home's assessed value by the millage rate set by your county. While rates are consistent, assessments can spike dramatically—especially during reassessment cycles or when you purchase a home—creating shock bills and escrow adjustments.
Key takeaways
- Property tax is calculated as: assessed value × millage rate. A $400,000 home in a 1% millage area costs $4,000 annually; a 2% area costs $8,000.
- Assessments are reviewed annually, but most increases are capped by state law (e.g., California's Prop 13 limits increases to 2% annually unless there's a change of ownership).
- When you buy a home, the assessor reassesses the property to its market value (your purchase price), often resulting in a significant tax increase.
- Escrow accounts pool property taxes and homeowners insurance, allowing you to pay monthly rather than in large, unpredictable lump sums.
- Escrow adjustments occur when taxes or insurance rise; your monthly payment increases to ensure enough is accumulated by the tax billing date.
How property taxes are assessed and calculated
Property taxes are a local tax, varying dramatically by state and county. In 2024, effective property tax rates (taxes paid as a percentage of home value) ranged from under 0.5% in Hawaii and Louisiana to over 2% in New Jersey, Illinois, and Texas.
The calculation is straightforward:
Assessment × Millage rate = Annual tax bill
The assessment is the county assessor's estimate of the property's fair market value. The millage rate is the tax rate, expressed in mills per dollar ($1,000 of value). For example, a 10 mill rate means you pay $10 in taxes for every $1,000 of assessed value, or 1% of the assessed value.
A $400,000 home in a 10 mill area: $400,000 × 0.010 = $4,000 annually, or $333 monthly.
The same home in a 20 mill area: $400,000 × 0.020 = $8,000 annually, or $667 monthly.
That's a $4,000-per-year difference based on millage—a critical factor in your total cost of ownership and one reason property taxes are often the deciding factor between two homes in different counties.
Assessment cycles and reassessment
Assessors review home values annually, but most states limit how much assessed value can increase without a change of ownership. California's Prop 13, for example, caps increases at 2% annually even if the market value is much higher. In some states, assessments are frozen until the property sells, then reset to market value.
This creates a situation where:
- A home purchased in 2010 for $300,000 and never reassessed has an assessed value of $300,000.
- The same home, sold in 2024 for $500,000, is reassessed at $500,000 and the new owner pays $200,000 more (in assessed value) in taxes.
When you purchase a home, you inherit this bump. If the previous owner bought in 2010 and never moved, and you're paying $500,000 in 2024, expect your assessed value to jump to $500,000—and your tax bill to reflect it.
In states with frequent reassessments (like Texas), assessments reset every few years, and rising home values lead to predictable tax increases. In states with Prop 13–style caps, assessments are slowly disconnected from market value, but change-of-ownership reassessments are steep.
When and how you'll pay property taxes
Property taxes are typically billed once or twice annually, depending on the county. Billing dates vary: some counties bill in January, others in June or October. Taxes are often due 30–60 days after billing.
If you own a home outright (no mortgage), you receive a tax bill and pay it directly. If you have a mortgage, your lender likely requires an escrow account (also called an impound account).
An escrow account is a monthly payment that bundles property taxes and homeowners insurance. The lender collects a monthly amount, deposits it into an account held in your name, and pays taxes and insurance from that account on your behalf. You never write separate checks; it's all bundled into your mortgage payment.
Example: A home with $4,000 annual property taxes and $2,400 annual insurance ($200/month) costs $533.33 monthly in taxes and $200 in insurance, or $733.33 in the escrow portion of your mortgage payment. The balance of your payment goes to principal and interest.
Escrow adjustments: when your payment goes up
Every year (or every few years), the lender reviews your escrow account. If property taxes increased, insurance premiums increased, or you were slightly under-escrowed, they increase your monthly payment.
An escrow adjustment of $50–$100 per month is routine. But if property taxes spiked (e.g., from $4,000 to $6,000 due to reassessment) or homeowners insurance jumped 15%, your payment might increase $150–$200 or more monthly.
Example: You bought a home at $400,000 and locked in $4,000 annual property taxes and $2,400 annual insurance in your escrow. Year two, property taxes jumped to $5,200 (due to reassessment post-purchase), and insurance increased to $2,700. Your annual escrow need increased by $1,500. Your lender spreads this over 12 months: $1,500 ÷ 12 = $125 additional per month.
This is a shock for many homeowners. A mortgage payment that was stable suddenly rose; they didn't realize the bump was due to taxes and insurance, not interest-rate changes or a lender mistake.
Can you contest your assessment?
Yes. If you believe your assessment is too high, you can file an appeal with the county assessor's office or the county appraiser's board of appeals. The process varies by state but typically involves:
- Requesting a reassessment or informal review with the assessor.
- Providing evidence (recent sales of comparable homes, a current appraisal) that supports a lower value.
- Filing a formal appeal if the assessor disagrees.
Many appeals are successful if you can show the assessment is significantly above market value. However, appeals take time (3–6 months), and you'll need to gather evidence and possibly hire an appraiser ($300–$500).
If your home is assessed at $450,000 but comparable recent sales show it's worth $400,000, a successful appeal could reduce your annual tax bill by $1,000–$2,000 (depending on millage). Whether this justifies the time and cost depends on the gap and your patience.
Property taxes and investment properties
Investment properties (rentals) are often assessed at higher millage rates than owner-occupied homes. Some counties charge 15–50% higher rates for rentals, based on the principle that rental property is a business, not a primary residence.
This is a significant consideration for buy-to-rent strategies. A home purchased for $400,000 that would cost $4,000 annually in owner-occupied taxes might cost $5,000–$6,000 as a rental. Over 30 years, that extra $1,000–$2,000 annually compounds.
Property tax deduction (federal income tax)
The federal deduction for state and local taxes (SALT) is capped at $10,000 annually as of 2024. This means if you pay $8,000 in property taxes and $4,000 in state income tax, you can deduct $10,000 total (not $12,000). If you pay $12,000 in property taxes alone, you can deduct $10,000.
This cap, introduced in 2018, significantly reduced the federal tax benefit of homeownership for high-tax-state residents. A homeowner in New Jersey or California paying $12,000+ in property taxes annually hits the cap with taxes alone, losing deductions for state income tax and other local taxes.
For most homeowners, this means some or all of your property tax deduction is wasted. Plan accordingly in your financial model.
Timeline: property tax assessment and escrow
Related concepts
Next
Property taxes are a fixed, ongoing cost determined by your location. HOAs and condo fees are different—they're optional (based on choice of property) but often bundled with property taxes in your escrow account, making them a hidden surprise for buyers who don't read the disclosure documents.