Can AI help me appeal my property tax assessment?
Partly. It can run the comparable-sales math and draft your appeal letter, but you have to pull real sales and follow your county's own rules and deadline.
01Why half-bot
- Comparing price per square foot across recent sales is math AI does well.
- It drafts a clear, polite appeal letter from the facts you give it.
- It can't look up your county's records or sales, and each county's process is different.
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Book this spot →02The prompt
Replace everything in [BRACKETS] with your own details, then paste it into your AI app.
You are a property tax consultant who helps homeowners prepare informal reviews and formal appeals. This is not legal or tax advice. My home: [TYPE, SQUARE FEET, BEDROOMS AND BATHS, YEAR BUILT, CONDITION] Assessed value on my notice: [$ AMOUNT, TAX YEAR] Appeal deadline on my notice: [DATE] Recent sales of similar homes nearby: [PASTE 3-5 WITH ADDRESS, SALE PRICE, SALE DATE, SQUARE FEET] Errors in the county's record of my home: [WRONG SQUARE FEET, EXTRA BATHROOM, ETC., OR NONE] Your task: tell me whether I have a case and draft my appeal letter. Rules: - MUST compare my assessed value with the sales I pasted using price per square foot, and show the math. - MUST use only the sales and facts I gave; NEVER invent a sale, a law or a deadline. - MUST say plainly if the numbers do not support an appeal. - MUST remind me to check my county's rules and deadline, and say this is not legal or tax advice. - If anything is missing, ask me up to 3 short questions first. Give me, in this order: a table of the sales (address, price, square feet, $ per square foot), a one-sentence verdict (appeal or not), a letter under 250 words, and a checklist of documents to attach.
03Steps
- Find 3 to 5 recent sales of similar homes on your county's site or a listings site.
- Fill in the brackets and paste the prompt into your AI app.
- Check the deadline and filing method on your notice or the county assessor's website.
04What can go wrong
- Missing the county's deadline usually ends the appeal, whatever the numbers say.
- A weak appeal can waste a hearing; if the math doesn't support it, don't file.
05What to use
Any major AI chat app: ChatGPT, Claude or Gemini. The free tier works.
06Our test run
Llama 3.3 70B · graded by GPT-OSS 120BSep 30, 2026Passed
Sample input we used: A 2,200 sq ft 1998 home assessed at $350,000, compared against three nearby 2026 sales between $340,000 and $355,000.
- Compares the assessed value to the pasted sales using price per square foot with the math shown
- Uses only the sales and facts given; no invented sale, law or deadline
- States plainly whether the numbers support an appeal
- Reminds the user to check county rules and deadline and says it is not legal or tax advice
- The appeal letter is under 250 words
What came back (excerpt):
$350,000 / 2,200 sq ft = $159.09 per square foot.
Majority of 3 runs; word limits counted in code.
One run with an invented sample, checked against the prompt's own rules by a second AI model (word limits counted by code). Your results can differ; how we test.
Prompt packBills, Refunds & Disputes 10 step-by-step prompts that go further than this one, $15.
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