Property Tax Assessment Too High? Check These 7 Record Errors

Before you argue that your home is worth less than the county says, check whether the county even has the facts right. Assessors value tens of thousands of homes at once, often from a record card that nobody re-measures after it is created. A wrong entry on that card, too many square feet, a bathroom that does not exist, a condition grade that ignores real damage, inflates your assessment before anyone compares your home to a single sale. Below are the seven errors that show up most often, how to check each one against your own home, and what proof to bring when you ask for a fix.

Why the record card matters

Your county did not walk through your house this year. Its assessor's office (in Florida, the property appraiser) maintains a record for every parcel: square footage, room counts, condition, year built, lot size, and any special features like a pool or a finished basement. A computer model turns those facts into a value, then adjusts it for the neighborhood and the market. If the facts are wrong, the output is wrong before the model ever gets to comparing your home with anyone else's.

That is worth checking before you build a comparable-sales case, covered in how to find comparable sales, because a factual correction is usually faster to get and does not depend on the market at all.

Seven record-card errors to check

1. Square footage

Square footage drives more of a model-based value than almost anything else. Measure your home's finished, heated living area yourself, or pull the number from the appraisal you got when you bought the home or from your original floor plan. Compare it to the figure on the record card. A difference of even a couple hundred square feet on an average home is a meaningful percentage error.

2. Bedroom and bathroom count

Record cards sometimes count a den as a bedroom, or credit a half bath that was removed in a renovation, or miss that a bathroom was never actually finished. Walk your card room by room against your actual floor plan.

3. Condition or quality grade

Every record card carries a condition or quality grade, and that grade assumes an average, well-maintained home. If your roof is failing, your foundation has settled, or you simply have not kept up with maintenance, the card may still show "average" or "good." This is one of the easiest errors to miss, because nothing on the card is factually wrong about size or count, only about condition.

4. Year built or effective age

Older homes are sometimes assessed on an "effective age" that assumes updates that were never made (a remodeled kitchen, a new roof, a rebuilt HVAC system). If the county's model assumes renovations you never did, the grade and the value both run high. Check the year built and, if the record shows one, the effective age.

5. Features you do not have

Pools, finished basements, attached garages, and outbuildings all add value in an assessment model, and all are common to see on a card for a home that never had them, or that had them removed. Check every feature line against your property.

6. Lot size or usable land

Lot size errors are common where a parcel has been split, where a portion of the lot is unbuildable, or where slope, an easement, or a flood zone limits what you can actually use. A ten-acre parcel where six acres are wetlands is not worth the same as ten usable acres, even if the record card treats the whole parcel as equal.

7. Wrong property class or use, or a dropped exemption

A record card also carries a property class or land use code, and an exemption status. A home coded as a duplex when it is a single-family residence, or a parcel still coded for a use that changed years ago, can be assessed on the wrong basis entirely. So can a homestead or other exemption that was removed in error, whether from a change-of-ownership record, a clerical mistake, or a renewal that was never processed. Georgia's Department of Revenue lists denial of an exemption as one of the recognized grounds for an appeal, alongside value, uniformity, and taxability.

How to get your record card

Every county publishes its property records online. Search for your county assessor (or, in Florida, your county property appraiser) and your address; most sites let you look up a parcel by owner name, address, or parcel number and will show the record card, and often a sketch of the structure, for free. Print or save it before you call anyone, so you have your own copy to mark up.

Ask for an informal correction first

All three states point homeowners toward talking to the assessor before filing a formal appeal, and a factual record error is exactly the kind of thing that conversation is built for. California's Board of Equalization, in Publication 30, tells homeowners: "Before filing an application, you should first meet informally with the assessor to discuss the assessment." Florida law goes further and puts an obligation on the office: under Fla. Stat. section 194.011(2), a taxpayer "may request the property appraiser to informally confer with the taxpayer," and the appraiser or staff "shall confer with the taxpayer regarding the correctness of the assessment."

Bring your own copy of the record card, marked up, and your proof for each line. If the county's model relies on that fact for surrounding comparisons or a condition-based adjustment, ask specifically how the correction will change your value, not only whether the fact will be fixed on paper.

When an error alone is enough, and when you also need comps

A pure factual error, extra square footage, a bathroom that does not exist, a feature you never had, is usually enough by itself. Correct the fact, and the same model that produced your original value should produce a lower one, because the input changed. You do not need comparable sales to make that case; you need a measurement, a photo, an appraisal, or a permit record that shows what is actually true.

A condition-based argument is a little different. Saying your home is in worse condition than the card shows is a factual claim, but boards weigh it more like a value argument. Photos, a contractor's repair estimate, and an inspection report carry it. If the real claim is that your California home's market value has fallen below its assessed value, that is a decline-in-value argument, not a record error, and it runs on its own timeline: comparable sales should be no later than 90 days after the January 1 lien date.

Once you move past "the county has the wrong facts" into "even with the right facts, my home is worth less than this," you need comparable sales, because that is a market claim, not a factual one. Is an appeal worth it? walks through a quick way to check whether the gap is large enough to be worth the time before you build that case, and how to find comparable sales covers what counts as comparable.

One more point in your favor in California: under Cal. Rev. & Tax. Code section 167(a), a rebuttable presumption favors the owner-occupant who has supplied the assessor with all required information, meaning the assessor carries the burden of proving the assessment right. That does not excuse you from bringing proof, but it changes who has to win the argument if the evidence is close.

Checklist: errors, where to check, and what to bring

Common questions

Will fixing a record error automatically lower my tax bill?

Usually, because the value model uses that fact as an input, but the office still has to recalculate and apply the change. Confirm the corrected value in writing and check your next bill.

What if the assessor will not fix an obvious error informally?

File the formal appeal by your state's deadline and bring the same documentation you brought to the informal conversation. The complete appeal guide covers each state's form and process.

Do I need a professional to measure my home?

No. A tape measure and a calculator are enough for a straightforward single-story home. For an irregular layout, a printed floor plan or the appraisal from your purchase is usually more reliable than a quick measurement.

Can a record correction affect other homes on my street?

No. A correction to your parcel's record only affects your parcel. It does not change your neighbors' assessments, even if their cards show the same error.

Where do I find my valuation date?

All three states value property as of January 1. Your notice should also state it. How to read your assessment notice explains every line, including this one.

If a record error is not the whole story, Drop Property Tax reviews the county record, compares it with recent sales, and handles the filing and hearing at no cost unless the appeal wins.