Appeal your property tax assessment with AI-picked comparables

Feed your assessment worksheet and comparable sales list to AI to find the strongest arguments, then file the written appeal yourself.

Part of: How to appeal your property tax assessment

Reported resultProperty tax $362.50 lowerAs reported by Wallet Hacks (Jim Wang). Results vary.

Cost Free option available Optional services take a cutYou can do this for $0. Some tools offer paid upgrades you don't need. Paid helpers listed below take a cut of savings.

Time (estimate)2–4 hrs

Difficulty (estimate)InvolvedSeveral steps or follow-ups over days or weeks.

{icon("alert", size=18)} Some services listed here take a percentage of your savings. Try the free DIY route first.

Interactive

Build my prompt

Fill in what you know and the text below updates as you type. Everything stays in your browser: nothing is saved, sent or tracked. Leave out account numbers and SSNs.

Your personalized prompt

I'm appealing my property tax assessment in [County and state]. Assessed value: $[Assessed (market) value]. I believe a fair value is about $[Value you believe is fair]. Deadline: [Appeal deadline]. Errors in my record: [Errors in your property record]. Comparable sales: [Comparable sales]. 1) Check my reasoning and any factual errors, 2) pick the 3–5 strongest comparables and explain why, 3) compute price per square foot for my home vs. the comps, 4) suggest a conservative and an aggressive requested value, and 5) tighten the appeal letter below (under 300 words) for [County and state]'s process. Flag anything I should verify, and tell me if my county's rules allow the assessment to go up on appeal.

Written appeal (starting draft)

Template, not legal or financial advice. Check every fact, date and amount, add your own details, and keep a copy of what you send.

[Your name]
[Property address / parcel ID]
[Date]

[County and state] Appraisal District / Board of Review

Re: Appeal of assessed value for [parcel ID]

I'm appealing the assessed value of $[Assessed (market) value] for the property above, and I request a value of $[Value you believe is fair].

1. Errors in the property record: [Errors in your property record]

2. Comparable sales:
[Comparable sales]

Based on these errors and comparable sales, the assessed value is higher than the property's market value. A one-page exhibit is enclosed.

I'm filing before the [Appeal deadline] deadline. Please confirm receipt and let me know the hearing date if one is scheduled.

Sincerely,
[Your name]

Follow these steps

Find your assessment notice and appeal deadline (often 30–60 days).
Request your property record card or worksheet and the comparable sales used.
Ask AI to compare them, flag errors (square footage, features, condition) and pick the best 3–5 comps.
File the written appeal with AI-drafted text and a one-page exhibit. Escalate to the appeals board if the first result is small.

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What to expect, and what to do if they say no

What to expect

Many appeals are settled informally before a hearing. Bring your comparable sales.
Results range from no change to a reduced value. Small wins still repeat every year until the next reassessment.

If they say no

Escalate to the next level (appeals board or state tax tribunal) before the deadline.
Check your eligibility for homestead or senior exemptions, which are separate from appeals.

What happened when people tried it

Reported He reports the county cut the structure value by $25,000, lowering his property taxes by $362.50. He called it modest and filed a second appeal.

What the AI did: A Maryland homeowner requested his Residential Worksheet and the Comparable Sales List, had ChatGPT analyze them, and pasted its suggested appeal text (with 3–5 comps) into the state's online form, taking about 15 minutes.

Source: Wallet Hacks (Jim Wang) · 2026-03-30 · First-person article

Why this works

The problem: Assessments can overstate your home's value, and most homeowners never appeal.

How AI helps: AI compares your property record with recent nearby sales, spots aggressive adjustments (quality factors, features), estimates a realistic target and writes the appeal text.

Tools & what they cost

Tool	Cost
ChatGPT	Free option available (Paid upgrades exist, but the free version works for this) Free tier; paid plans available
Ownwell	Takes a cut of savings: 25–35% of first-year savings (Charges a percentage of what it saves you) Contingency: 25% (Texas) to 35% (e.g., GA, CA, FL, NY, PA) of first-year savings; nothing if no savings

What do these labels mean?

Free No cost at all.
Free option available Paid upgrades exist, but the free version works for this.
Costs money You pay a set price or subscription.
Takes a cut of savings Charges a percentage of what it saves you.
Time · Difficulty Our estimates for a typical first try, not guarantees.
Reported What the linked source says happened, often self-reported. Your results will vary.

Watch out for

Deadlines are strict and vary by county.
Contingency services take 25%–35% of first-year savings. DIY is free.
Appeals can occasionally raise an assessment in some jurisdictions. Check your local rules.

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Sources

Last verified 2026-10-19. Not financial, legal, tax or medical advice. Disclaimer.