Is Appealing Property Taxes Worth It?

The National Taxpayers Union Foundation has tracked residential assessment accuracy for years and consistently finds that between 30% and 60% of U.S. properties carry assessed values higher than their market value supports. That's not a fringe result — it's the documented byproduct of how mass appraisal works. County assessors value hundreds of thousands of parcels at once using statistical models. Those models are accurate on average but systematically miss street-level conditions: the arterial road behind your fence, the water intrusion issue in the basement, the distressed sale two doors down that pulled neighborhood comps below your appraisal.

The striking gap is on the filing side: fewer than 5% of homeowners appeal in any given year. That means the overwhelming majority of people who are likely over-assessed simply pay the inflated bill — usually because they assume the county's number must be defensible, or because appealing sounds harder than it is. If you've received an assessment notice and haven't verified whether your value holds up against recent sales, the base rate alone says it's worth an hour to find out.

A typical residential appeal takes three to five hours of real work: pulling your property record card, locating comparable sales, and completing a one-page filing form. In nearly every jurisdiction, filing costs nothing.

The savings depend on your local millage rate and the size of the over-assessment. A common pattern: if your home is appraised $40,000 above what recent comparable sales support, and your combined local rate is 25 mills (dollars per $1,000 of assessed value), the annual overpayment is $1,000. In states that assess at 40% of market value — as Georgia does — removing $40,000 from appraised value reduces your taxable base by $16,000 and saves around $400 per year at that same rate. Even $200–$400 annually puts the hourly return on five hours of appeal prep well above most people's time cost. And unlike a one-time refund, a successful appeal compounds: each year you hold the lower value is another year you aren't paying the premium.

The full appeal walkthrough covers how to pull comps and complete the form from start to finish — most of the work is research, not argument.

The NTUF puts the success rate for taxpayers who appeal with organized evidence at 40–60%. That range reflects a real spread: appeals backed by targeted, well-sourced evidence win at substantially higher rates than appeals that rely on a general sense that the value feels high.

The evidence that actually moves appeal boards is narrow and concrete:

• Comparable sales. Three to five homes near yours, similar in size, age, and condition, that sold for less than your appraised value in the period before the assessment date. This is the backbone of nearly every successful residential appeal.
• Property record errors. Pull your record card and verify square footage, bedroom and bathroom count, basement finish status, and lot size. A 250-square-foot error is not uncommon and is the fastest category of win — the county's own data supports the correction.
• Condition documentation. Photos and written estimates for anything the mass model can't see: structural issues, an unusable outbuilding, deferred maintenance that buyers would discount from the price.

The guide to gathering and presenting appeal evidence covers sourcing for each category, including where to find public sales data and how to format a comp sheet that makes the board's decision easy. The difference between the low and high end of the 40–60% range is mostly preparation quality, not the force of your argument.

A successful appeal doesn't correct just one year's bill. Most jurisdictions either formally freeze the lower assessed value for one to three years or treat the resolved appeal as the new baseline until the next reassessment cycle. Georgia's 299(c) freeze, for example, holds the settled value for the following two years in most residential cases. Other states work similarly, though the mechanics vary.

That multiplier reshapes the cost-benefit calculation considerably. A $350 annual saving held for three years is over $1,000 returned on the same five hours of prep. A $600 saving held for three years is $1,800. This is why appeals filed even late in an assessment cycle are often worth pursuing — the freeze extends the benefit well past the notice that prompted it. When you're deciding whether to appeal, run the numbers on two or three years of expected savings, not just the current year.

An honest cost-benefit analysis has a short side too. Three situations where appealing doesn't make sense:

• Your assessment is below market. If comparable sales suggest your home is worth more than the county says, filing an appeal invites scrutiny that could result in a higher value. Read your comps carefully before deciding.
• The potential savings are minimal. If you're a few thousand dollars over-assessed in a low-millage jurisdiction, the annual savings might be $40–$70. That's not nothing, but if your time is genuinely constrained, it may not clear the bar.
• A sale or refinance is imminent. An active appeal can complicate timing with lenders and buyers in some jurisdictions. Check with your closing agent before filing if a transaction is close.

Outside those three scenarios, the cost-benefit almost always favors filing. The DIY appeal guide includes a one-page worksheet for running your own numbers before you commit the time.

Tax appeal firms do real work, and for commercial properties or multi-parcel portfolios they can be the right call. For a standard residential appeal, the contingency math is harder to justify: firms typically charge 25–50% of the first year's savings, and the work they do — finding comps, checking record cards, completing the form — is exactly what a prepared homeowner can do in a Saturday morning.

If your potential first-year saving is $400 and a firm takes 30%, you net $280 while they keep $120 for paperwork you could have done yourself. If the freeze holds for two more years, you've paid the firm for three years of benefit based on one year of savings. The board hearing itself is almost always a 10-to-20-minute conversation — not a proceeding that requires professional representation.

The full how-to-appeal guide walks through the process end to end: requesting your property record, sourcing comps, completing the filing form, and what to expect at the hearing. For most homeowners, that's the complete picture — and it doesn't cost a third of the win.