To appeal your property tax assessment, check the assessor’s record of your home for errors, compare your assessed value with recent sales of similar homes, and file an appeal with your local assessor or review board before the deadline printed on your assessment notice. Many disputes are settled in an informal review without a hearing. Deadlines are short and the rules differ by state and county, so the most important step is finding your local deadline the day your notice arrives.
Key takeaways
- Your tax is roughly market value × assessment ratio × tax rate, minus any exemptions. An appeal can only change the value (and sometimes exemptions), not the rate.
- The strongest cases are factual errors in the record and recent sales of comparable homes for less than your assessed value.
- Deadlines are short and set locally. In Georgia, for example, you have 45 days from the date the notice was mailed.
- In our example, cutting a $350,000 market value to $320,000 saves $360.00 a year in a Georgia-style system, and your escrow payment would eventually fall by $30.00 a month.
- Check that you receive every exemption you qualify for. It can be easier than an appeal.
How your property tax bill is calculated
Property tax is set locally, so the details vary, but nearly every system follows the same three steps. First, the assessor estimates your home’s market value. Second, an assessment ratio converts market value to assessed value. Some states assess at full value; others use a fraction. Georgia, for example, assesses property at 40% of fair market value. Third, local taxing bodies apply their rates to the assessed value after subtracting any exemptions.
Rates are often stated in mills. One mill is $1 of tax per $1,000 of assessed value, so 30 mills equals 3% of assessed value. The Georgia Department of Revenue’s own illustration uses a $100,000 house assessed at $40,000; at 25 mills, the tax is $1,000.
This matters for an appeal because the tax rate is set by elected bodies through budgets, not by the assessor. You cannot appeal the rate. What you can challenge is the value, the accuracy of the property record, whether your home is assessed uniformly with similar homes, and whether you received the exemptions you qualify for.
Step 1: Check the property record for errors
Most assessors publish a property record card online or provide one on request. Compare it line by line with reality: living area, lot size, number of bedrooms and bathrooms, finished versus unfinished basement, garage, year built, condition and features such as a pool or fireplace. A record that lists an extra bathroom or a few hundred extra square feet can push the value up on its own.
Errors are the easiest wins because they are factual. Gather proof such as a survey, an appraisal from your purchase, building plans or photos. Many assessors will correct a clear error without a formal appeal, but ask whether the correction protects your appeal rights or whether you still need to file by the deadline.
Step 2: Compare recent sales of similar homes
If the record is accurate, the question becomes whether the value is too high. Look for three to five sales of homes like yours, ideally in the same neighborhood, of similar size, age and condition, sold close to the assessment date your jurisdiction uses. Your assessor’s site, the county recorder or a real estate agent can help you find them.
Adjust for real differences. A comparable home with a renovated kitchen or an extra bedroom should have sold for more than yours. Also check uniformity: if similar homes on your street carry lower assessed values than yours, that can be a separate ground for appeal in many states. Present the evidence in a short, organized packet with addresses, sale dates, prices and your adjustments.
Step 3: Know your deadline and the appeal path
Your assessment notice usually states the deadline and where to file. If it does not, check your county assessor’s website or your state revenue department’s property tax pages. Missing the deadline usually means waiting a full year.
Most systems have two stages. An informal review is a conversation or written exchange with the assessor’s office, and many cases end there. A formal appeal goes to an independent body such as a board of review or equalization, with a hearing where you present evidence. Further appeals to a state board or court are possible but involve more time and cost.
Georgia shows how specific these rules can be. According to the Georgia Department of Revenue, appeals are filed with the county board of tax assessors, not the state, within 45 days of the date the notice was mailed. When you file, you choose a route: the county board of equalization, arbitration for value disputes (which requires a certified appraisal), or a hearing officer, which is limited to non-homestead property valued above $500,000. Allowed grounds include value, uniformity, taxability and denial of an exemption. Your state’s process may look quite different.
Worked example: what a successful appeal saves
Suppose your notice puts your home’s market value at $350,000. We ran two kinds of systems: a Georgia-style system that assesses at 40% with an assumed total rate of 30 mills, and a full-value system with an assumed total rate of 1.10%. Both rates are illustrative; yours depends on your county, city and school district. No exemptions are applied.
We tested two outcomes. In the first, comparable sales support a value of $320,000. In the second, the record lists 2,400 square feet but the home is 2,150. Scaling the assessor’s implied $145.83 per square foot to the true size gives $313,542.
| Scenario | Market value | Assessed value | Annual tax | Saving per year | Lower escrow per month |
|---|---|---|---|---|---|
| 40% ratio, 30 mills: original | $350,000 | $140,000 | $4,200.00 | — | — |
| 40% ratio, 30 mills: comparable sales | $320,000 | $128,000 | $3,840.00 | $360.00 | $30.00 |
| 40% ratio, 30 mills: square-footage fix | $313,542 | $125,417 | $3,762.50 | $437.50 | $36.46 |
| Full value, 1.10%: original | $350,000 | $350,000 | $3,850.00 | — | — |
| Full value, 1.10%: comparable sales | $320,000 | $320,000 | $3,520.00 | $330.00 | $27.50 |
| Full value, 1.10%: square-footage fix | $313,542 | $313,542 | $3,448.96 | $401.04 | $33.42 |
The savings look modest for one year, but they can repeat. If the lower value carries forward for three years, the comparable-sales win in the Georgia-style system is worth $1,080.00 and the square-footage fix $1,312.49. Whether a reduced value carries forward depends on your state’s reassessment cycle.
Weigh the cost. An informal review often costs nothing but your time. If you pay for an appraisal, assumed here at $500, the comparable-sales win in the Georgia-style system pays it back in 1.4 years, and the square-footage fix in 1.1 years. Some firms handle appeals for a share of the savings; read the contract and compare that share with doing it yourself.
Exemptions: the other way to lower your bill
Before you appeal, confirm you receive every exemption you qualify for. Most states offer a homestead exemption for an owner’s primary residence, and many add exemptions or credits for older homeowners, people with disabilities and veterans, especially those with service-connected disabilities. Some states also limit how fast the assessed value of a homestead can rise. Exemptions usually require an application by a set date, and they often do not transfer automatically when you buy a home. Your county assessor or tax commissioner lists the options and deadlines.
How a lower assessment affects your escrow account
If your lender pays your taxes from an escrow account, a lower bill does not cut your mortgage payment right away. Under federal rules (Regulation X), the servicer analyzes the account each year. If the analysis finds a surplus of $50 or more and you are current on payments, the servicer must refund it within 30 days; smaller surpluses may be refunded or credited. The new, lower tax then lowers the escrow part of your payment going forward. The servicer may also hold a cushion of up to one-sixth of the year’s estimated disbursements.
Send your servicer a copy of the revised bill or appeal decision so the next analysis uses the right number. If you pay your taxes directly, which you will once your mortgage is gone, the saving arrives with the next bill. Paying off the loan early changes how you handle these bills; see should you pay off your mortgage early.
When an appeal is not worth it
- Your value is already at or below market. Review boards can, in some places, raise a value they find too low. Ask about this before filing.
- The complaint is the tax rate. Higher bills caused by a rate increase are a matter for local budget hearings, not the assessor.
- The potential saving is small. If the evidence supports only a minor reduction, the time or appraisal cost may exceed the benefit.
- You just bought the home. A recent arm’s-length purchase price is strong evidence of value. If you paid more than the assessed value, an appeal is unlikely to help.
Property tax is one of the larger recurring costs of owning a home, alongside upkeep. Planning for both is easier with a dedicated line in your budget; our guide on budgeting for home maintenance covers the other half, and rent vs. buy shows how taxes fit into the cost of owning.
Frequently asked questions
How do I find my property tax appeal deadline?
Look first at your assessment notice, which usually states the deadline and where to file. If it does not, check your county assessor’s website or your state revenue department. Deadlines are often counted from the date the notice was mailed, not the date you received it.
Can my assessment go up if I appeal?
In some jurisdictions, yes. A review board may set a value based on all the evidence. Ask your assessor’s office about local rules and make sure your evidence supports a lower value before you file.
Do I need an appraiser or attorney?
Not usually for an informal review or a local board hearing, where organized comparable sales and record corrections are often enough. Some routes require more: Georgia’s arbitration option, for example, requires a certified appraisal.
Will my mortgage payment drop right away if I win?
Not usually. Your servicer adjusts escrow at its annual analysis. A surplus of $50 or more must be refunded if you are current, and the lower tax reduces future escrow payments.
Are property taxes deductible on my federal return?
Only if you itemize, and only within the federal cap on state and local tax deductions. Check the current Schedule A instructions from the IRS for the limit that applies to your tax year.
Sources
- Property Tax Millage Rates, Georgia Department of Revenue, accessed Oct 2026
- Filing a Property Tax Appeal, Georgia Department of Revenue, accessed Oct 2026
- 12 CFR 1024.17 Escrow accounts (Regulation X), CFPB, accessed Oct 2026
- Instructions for Schedule A (Form 1040), IRS, accessed Oct 2026
This article is general education, not individualized financial, tax or legal advice.
