An appeal board is not persuaded by how strongly you feel. It is persuaded by evidence that looks like the evidence an appraiser would bring. Understanding what that is, and what it is not, is the difference between a reduction and a polite denial.
Comparable sales are the backbone
Almost every successful over-valuation appeal rests on comparable sales, or comps: recent sales of homes similar to yours, near you, that sold for less than the value the assessor assigned. Boards think in comps because that is how the whole appraisal profession estimates value. Bring good ones and you are speaking the board's language.
What makes a comp strong:
| Attribute | Strong comp | Weak comp |
|---|---|---|
| Recency | Sold within about 6 to 12 months of your assessment date | Sold two or more years ago, in a different market |
| Proximity | Same neighborhood or subdivision, similar street | Across town, or a different school district |
| Similarity | Close in size, age, style, bed and bath count, lot | Much larger, newer, or a different property type |
| Sale type | Arm's-length open-market sale | Foreclosure, estate sale, or family transfer |
Three to five strong comps beat a dozen weak ones. A board that sees one clearly cherry-picked foreclosure will discount your whole packet, so lead with quality.
Adjust your comps honestly
No two homes are identical, and appraisers handle that by adjusting. If a comp has one more bathroom, or 200 more square feet, or a finished basement yours lacks, its sale price should be nudged down before you compare it to your home, and vice versa. You do not need appraiser-grade precision, but showing that you accounted for differences makes your comps far more credible than dropping five raw sale prices on the table.
A professional appraisal, when the stakes justify it
A recent appraisal from a licensed appraiser is among the strongest evidence you can bring, because it is exactly the kind of analysis the board would otherwise have to do itself. It costs money, often a few hundred dollars, so it makes sense when the potential tax savings clearly exceed the cost, or when your case is close and you want to remove any doubt. Some boards give a formal appraisal more weight than an automated estimate, so if your appeal reaches a formal hearing on a valuable property, it can be worth it.
Your own recent purchase price
If you bought the home recently in an ordinary open-market transaction for less than the assessed value, that sale price is powerful evidence, arguably the single best comp available, because it is your actual home selling in the actual market. Bring the closing statement. The main caveat is timing: a purchase from several years ago in a different market carries much less weight.
Condition problems the assessor never saw
Assessors value from records and formulas, not from walking through your home. If your property has real condition issues that reduce its value, document them:
- A roof, foundation, or major system at the end of its life, with photos and, ideally, a contractor's estimate.
- Water damage, structural cracks, or deferred maintenance.
- Functional problems: an awkward layout, no garage where the record assumes one, a busy road or other external nuisance.
Dated photos and third-party estimates turn a subjective complaint into documented evidence.
Errors in your property record
Sometimes the strongest evidence is the simplest: the assessor's record is factually wrong. Pull your property record card and check the square footage, bed and bath count, lot size, and whether a basement or attic is counted as finished living space. If any of it is overstated, you are not arguing opinion, you are correcting a fact, and corrections are among the easiest wins because the board does not have to weigh anything.
What does not win
Just as important is knowing what to leave out, because weak arguments dilute strong ones:
- Your taxes went up a lot. A large increase is not evidence the value is wrong; the board rules on value, not on the size of the change.
- You cannot afford the bill. Hardship is real, but the appeal board is not the venue for it; look into separate exemption or relief programs instead.
- A neighbor pays less, with no comps. Uniformity can be a valid argument, but only if you bring the assessment data to prove it, and only where your state credits it.
- Improvements you have not made. Telling the board what you plan to fix does not lower today's value.
Assemble it like a case, not a pile
Put your evidence in order before the hearing: a one-page summary stating the value you believe is correct and why, the comps table, then the supporting documents (photos, appraisal, purchase docs, corrected record). Bring copies for each board member. A tidy, one-argument packet reads as credible; a disorganized stack invites skepticism.
The short version
Win on value, and prove value with three to five strong, recent, nearby, genuinely similar comps, adjusted honestly. Reinforce with a purchase price, an appraisal, documented condition problems, or a corrected record where those apply. Leave out the bill increase and the affordability argument. Hand the board a clean, ordered packet that reaches the conclusion for them.
Get the comps pulled for your address.
The report gathers recent comparable sales for your home, alongside your assessed value, the estimated gap, and the appeal steps for your area, so your evidence packet starts half-built.
Get your Property Tax Appeal Report · $29