Own Luxury Homes®
How to Read Your Property Tax Bill
Tax formula: (assessed value − exemptions) × millage ÷ 1,000. Year-two surprise: county reassesses to purchase price after sale. Multiple taxing authorities: county + school district (largest) + city + special districts. Caps: CA Prop 13 (2%/yr reset at sale), FL Save Our Homes (3%/yr + portable), TX (10% taxable cap). Appeal: 30–90 day deadline; comparables + error documentation; file homestead exemption first. Own Luxury Homes® 12-Point Agent Integrity Audit™ — file homestead exemption within 30 days.
How to Read Your Property Tax Bill: Assessed Value, Millage Rates, and the Math Behind What You Owe
"My mortgage payment went up $300 and I have a fixed rate." This is the most common call new homeowners make in February. The answer is almost always on the property tax bill: the county reassessed the property to the purchase price, raising the tax, raising the escrow, raising the payment. Understanding how property taxes are calculated — and how to read the bill that drives your escrow payment — prevents this surprise and reveals whether you're paying too much.
The Anatomy of a Property Tax Bill
| Line Item | What It Means | What to Check |
|---|---|---|
| Parcel / property ID | Unique identifier in county records | Keep this number for exemption applications and appeals |
| Assessed value | County's value assigned for tax purposes; may be 80–100% of market or less depending on state assessment ratio | Compare to what you paid; if higher than purchase price, research an appeal |
| Exemptions | Homestead, senior, veteran, disability deductions applied to assessed value | Verify your homestead exemption appears; if missing, file immediately |
| Taxable / net assessed value | Assessed value minus all exemptions; the actual base the rate is applied to | This is the number that drives your tax calculation |
| Millage rates by authority | Each jurisdiction's rate listed separately (county, school district, city, special districts) | The school district millage is typically the highest single line |
| Tax by authority | Taxable value × millage rate ÷ 1,000 for each jurisdiction | Add them yourself as a spot-check |
| Total annual tax | Sum of all jurisdiction taxes; what your escrow pays | Divide by 12 to see your monthly escrow portion |
| Discount / early payment dates | Many counties offer 2–4% discount for early payment | Your escrow servicer may or may not capture this savings |
The Tax Calculation: The Math
The Formula
Property tax = (Assessed value − Exemptions) × Combined millage rate ÷ 1,000. Example: assessed value $320,000. Homestead exemption: $50,000. Taxable value: $270,000. Combined millage: 18.5 mills (county 7 + school 8 + city 3.5). Tax = $270,000 × 18.5 ÷ 1,000 = $4,995/year. Monthly escrow: $4,995 ÷ 12 = $416/month.
Why Taxes Rise After You Buy
| Trigger | Impact | States Most Affected | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Sale triggers reassessment to purchase price | Assessed value jumps to what you paid; tax rises proportionally | Most states; biggest jump in states with prior caps (long-held properties) | |||||||
| Annual market-based assessment increase | County updates all values annually based on market data | States without caps; CA/FL/TX have protection mechanisms | |||||||
| Homestead exemption not yet applied | Buyer paid taxes without exemption in year one; exemption reduces bill in year two | All states; filing window varies — typically March 1–April 1 | |||||||
| Millage rate increase | School levies, bond issues, new special districts add to the rate | Any jurisdiction that passed a levy or bond measure | |||||||
| Permitted improvement completed | Addition, pool, ADU increases assessed value | Any state; effect appears after permit closeout | |||||||
| The most common new-buyer surprise: county reassessment to purchase price inflates the tax bill, which increases the escrow payment, which raises the total monthly mortgage payment in year two — even on a fixed-rate loan. | |||||||||
Assessment Caps: States That Protect Long-Term Owners
| State / Program | Cap | How It Works | |||||||
|---|---|---|---|---|---|---|---|---|---|
| California — Prop 13 | 2% maximum annual increase | Resets to market value at sale; prior owner had protected low assessment; new buyer starts fresh | |||||||
| Florida — Save Our Homes | Lesser of 3% or CPI annually | Applies after homestead; compounds over years; portability lets you bring accumulated savings to a new home | |||||||
| Texas — Homestead cap | 10% cap on taxable value increase per year for homesteads | Assessment can rise faster; taxable value capped at 10%/yr | |||||||
| New York — STAR program | School Tax Relief credit ($340–$700) | Not a cap but reduces school tax; Basic and Enhanced (seniors) versions | |||||||
| Florida's Save Our Homes is among the most powerful long-term homeowner protections. A buyer who purchased in 2015 at $400K pays on ~$550K assessed in 2026 while their market value may be $750K+ — a $200K+ protected assessment gap that is lost when they sell and the new buyer starts at market. | |||||||||
What to Do If Your Assessment Is Too High
| Step | How |
|---|---|
| 1. Pull comparable recent sales | Find 3–5 sales of similar properties for less than your assessed value; the county assessor's website often has this data |
| 2. Check for factual errors | Wrong square footage, wrong bedroom count, wrong year built — common assessor errors that reduce value when corrected |
| 3. File before the deadline | Most counties: 30–90 days after the assessment notice; this is a hard deadline; missing it forfeits the year |
| 4. Present your evidence at the hearing | Comparable sales + any independent appraisal + error documentation; most informal hearings result in reduction if evidence is strong |
“File your homestead exemption within the first 30 days of ownership. In most states, filing after the deadline means you wait a full year. The savings on a $400,000 home with a $50,000 exemption at a 20-mill rate is $1,000/year. Missing the deadline is $1,000 gone. After that, watch your assessment notice in year two. If the county reassessed to your purchase price and that number is higher than what comparable properties are selling for, file an appeal. It takes two hours and costs nothing.”
— Ryan Brown, Principal Broker & CEO, Own Luxury Homes®
What is assessed value vs market value?
Market value: what buyers would pay today. Assessed value: the county's figure for tax purposes. May equal market value, or may be a percentage of it (state assessment ratios vary). States with caps (CA, FL, TX): assessed value can be far below market for long-term owners. Tax is always calculated on assessed value, not market value.
Why did my property taxes go up after I bought?
Most common cause: county reassessed the property to your purchase price. If the prior owner had held for 15 years with a capped assessment of $250K and you bought for $500K, the county resets to $500K when the deed transfers. Other causes: annual market-based increases, millage rate changes, permitted improvements. Check your bill line-by-line vs the prior year's bill to find the source.
What is a millage rate?
1 mill = $1 per $1,000 of taxable assessed value. Your total rate is the sum of every jurisdiction's mill: county + school district + city + special districts. A combined rate of 18.5 mills on $270,000 taxable value = $4,995/year. School district is usually the largest single component, often 7–12 mills.
How do I appeal my property tax assessment?
Step 1: find 3–5 comparable recent sales below your assessed value. Step 2: check your property record for factual errors (wrong square footage, bedroom count). Step 3: file before the deadline (30–90 days after the assessment notice — varies by county). Step 4: attend the hearing with your comparables. Most successful appeals produce 5–15% assessment reductions. See our dedicated guide: How to Dispute Your Property Tax Assessment.
Own Luxury Homes® — file homestead exemption immediately after closing. 12-Point Agent Integrity Audit™. Talk to a specialist ›
"The introduction Own Luxury Homes® makes is to a specialist with documented closing history in your specific market — not the county, not the metro, the submarket you're actually selling or buying in. That's the standard we verify before your name goes anywhere."
— Ryan Brown, Principal Broker & CEO, Own Luxury Homes® (FL License BK3626873)