Is Appealing Your Property Taxes Worth It? Do the Math

Whether an appeal is worth your time comes down to one number: the gap between your assessed value and what your home would actually have sold for on January 1, multiplied by your local tax rate. If that gap is under 5 percent, the dollars at stake usually do not cover the hours an appeal takes. If it is over 10 percent, the math almost always favors filing. You can work out which side of that line you are on in about five minutes with your notice, a few recent nearby sales, and last year's tax bill.

Step 1: Find your assessed value and the value you're actually taxed on

Start with your notice. In each state the number you appeal is not always the same as the number your bill is calculated from; the complete appeal guide covers where to find each figure and how to file once you have decided it is worth doing.

In California, your assessed value is usually your Proposition 13 base year value, grown by no more than 2 percent a year, codified at section 51(a)(2). If the market has fallen below that base, the assessor applies a lower Proposition 8 value instead, at least for that year. Either way, the assessed value is what you are billed on, before exemptions.

In Georgia, the assessor estimates fair market value as of January 1 and assesses 40 percent of it under O.C.G.A. section 48-5-7. A standard $2,000 homestead exemption (section 48-5-44) reduces what is actually taxed, and under the newer floating homestead exemption in O.C.G.A. section 48-5-44.2, a homestead may also be exempt from the amount by which its current assessed value exceeds an adjusted base year value, unless your county, city, or school district opted out. You appeal the assessed value, not the exemption.

In Florida, the property appraiser sets "just value," an estimate of market value. If you have a homestead, the taxable value is capped separately under the Save Our Homes limit, so your just value and your actual taxable value can differ substantially the longer you have owned the home. You appeal the just value; whether a reduction changes your bill depends on where your capped value already sits, which is exactly why Step 5 below matters.

Step 2: Estimate market value on January 1

All three states value property as of January 1 of the tax year. Pull three to five sales of homes similar to yours in size, age, and condition, sold as close to that date as practical. California's decline-in-value guidance uses a similar window, capping usable comparable sales at no later than ninety days after the January 1 lien date for that kind of case. Adjust roughly for obvious differences (an extra bathroom, a bigger lot) using what similar features actually add in your market, then land on a number you would defend to a stranger.

This does not need to be precise to the dollar. You are checking whether your assessed value is in the neighborhood of what the comps say, not building a courtroom exhibit yet.

Step 3: Compute the gap

Subtract your estimated market value from your assessed value, then divide by the market value to get a percentage.

An illustrative example, using the comparable-sales method from Publication 30: if your assessed value is $550,000 and your comparable sales point to $480,000, the gap is $70,000, or about 14.6 percent. That is a large enough gap to justify moving to the next step.

Step 4: Multiply by your effective tax rate

Your effective tax rate is your total tax bill divided by your assessed (or taxable) value from last year. Do this with your own numbers; it varies by county, school district, and any special assessments layered onto your bill.

For an illustrative example only, assume an effective tax rate of 1.0 to 1.2 percent, a range typical of many California and Georgia homeowners, though yours may run higher or lower. On the $70,000 gap above, at an assumed 1.1 percent rate, a full correction would save roughly $770 in the first year (70,000 times 0.011). Recalculate with your actual rate before you decide anything, and remember that in California a Prop 8 reduction is reviewed every year, so the saving is for as long as the market stays below your factored base year value.

Step 5: Weigh how long the win lasts, and what it costs to try

A one-year savings and a multi-year savings are not the same decision, and the filing fee to get there is usually small next to either one.

Georgia: if your appeal reduces your value, the county cannot raise that value again for the following successive tax years, under O.C.G.A. section 48-5-299(c). Chatham County's Board of Assessors describes this, after the 2024 and 2025 legislation, as a three-year freeze, conditional on the value actually being reduced and on you or your representative attending the hearing. Filing a new appeal while a freeze is active can also remove it, so a win here tends to compound for several years, not one.

California: a Proposition 8 reduction for market decline is reviewed every year and can rise back toward your factored base year value as the market recovers, so that kind of win may only hold for the year you file. A correction to a factual error in your base year value, by contrast, lasts as long as you own the home. Either way, for an owner-occupied home, section 167(a) gives you a rebuttable presumption in your favor once you have supplied the information the assessor requires, which is a meaningful advantage most homeowners do not realize they have.

Florida: reducing your just value also resets the base your Save Our Homes cap grows from under section 193.155(1), which limits future annual increases to the lower of 3 percent or the change in the Consumer Price Index. A win here effectively compounds for as long as you keep the homestead, because every future year's 3 percent ceiling applies to a smaller starting number.

The filing fee itself is rarely the deciding factor. It runs from $0 in Georgia to a few hundred dollars in a handful of California counties; the cost guide has the full table by county. Weigh it in, but it is usually small next to even a one-year win, let alone one that holds for two or three.

The five-minute decision table

When not to appeal

Not every gap points toward filing.

Your assessment is already below market. If your comps come in at or above your assessed value, there is nothing to appeal; you are already paying tax on a number lower than what the county could justify.

Your capped value is already far under market in Florida or California. A longtime Florida homestead owner's Save Our Homes-capped taxable value is often well below the current just value, sometimes by a wide margin, because the cap limits growth to 3 percent a year while the market moved faster. Winning a reduction in just value does nothing to your bill if your taxable value is already sitting below where a reduced just value would land. The same logic applies to a California home still comfortably under its factored Proposition 13 base; if the market has not fallen below that base, there is no Proposition 8 relief to seek in the first place. In both cases, check which number you are actually taxed on (Step 1) before you spend the afternoon on comps.

If you found a record-card error rather than a valuation gap, the calculation above still applies once you correct the error and see how much it moves your number; common record errors is worth reading alongside this if you have not checked your county's facts about your home yet.

If you decide the numbers work, Drop Property Tax's free review will check your county record and comps against your notice for you at no cost, and there is no fee unless the appeal wins.

Common questions

What effective tax rate should I actually use?

Divide your total tax bill from last year by your assessed or taxable value from that same year. That gives you your own rate. The 1.0 to 1.2 percent range in this article's example is illustrative only and will not match every homeowner.

Does a win always last more than one year?

No. A California Proposition 8 reduction is reviewed annually and can rise again as the market recovers. A Georgia reduction under section 48-5-299(c) can freeze the value for successive years, and a Florida reduction lowers the base your Save Our Homes cap grows from going forward. Can appealing backfire? covers the flip side of this same question.

What if my gap is small but I found an error in the county's record of my home?

Correct the error first and see how much it moves your assessed value; a wrong square footage figure or an extra bathroom that does not exist can produce a bigger swing than a market-value argument alone. Property record errors covers what to check.

Is it ever worth appealing a gap under 5 percent?

Occasionally, if your time cost is genuinely low or your county's filing fee is $0, as it is in Georgia and in Orange and San Diego counties in California. For most homeowners in most counties, the cost guide will help you decide whether the arithmetic still works at that size.