State Guide

How to Appeal Your Property Taxes in Maine (2026 Guide)

Published July 27, 2026

Maine doesn't run property tax appeals on a statewide calendar, and it doesn't assess every town the same way. Both facts change how you read your notice. If you think your Maine home is over-assessed, the thing to file is an abatement application with your town's assessor — and the clock that matters started when your town committed its tax list, not on some date in the statute book.

The Maine deadline: 185 days from commitment

You must file a written abatement application with your assessor within 185 days from commitment, stating the grounds — 36 M.R.S. §841(1). "Commitment" is the day your assessor officially hands the list of taxpayers and amounts due to the municipal tax collector. Maine Revenue Services puts it plainly in Property Tax Bulletin No. 10: the commitment date "usually occurs about the time that tax bills are first mailed for the tax year."

That's why there's no honest single Maine deadline. Every town commits on its own schedule, so your 185 days start on your town's date — check your tax bill or call the assessing office and ask for the commitment date directly. (Separately, the assessor keeps discretionary authority to abate within one year of commitment even after your 185 days lapse, and genuinely illegal assessments or clerical errors — not valuation disagreements — can go to the municipal officers up to three years out.)

What "over-assessed" means in Maine: the certified ratio

Maine towns are not required to assess at 100% of market value. Each one declares a certified ratio — its assessed value as a percentage of just (market) value — on its annual return under 36 M.R.S. §383. That single number decides whether your assessment is high or perfectly normal.

Maine Revenue Services works the arithmetic in Bulletin No. 10: if your home's just value is $250,000 but it's assessed at $275,000, it is not necessarily over-assessed — in a town with a 110% certified ratio, $250,000 × 110% = $275,000 is exactly right. Run it the other way and the same logic finds a real case: if your property is assessed at 110% of just value while everything else in town is assessed at 90%, you have an argument.

The spread is wide and worth knowing before you file. In the 2024 Municipal Valuation Return Statistical Summary — the most recent MRS has published — 234 of the 482 municipalities listed declared a 100% certified ratio, and the rest ran from 50% to 112%. Maine's minimum assessing standards say a town's ratio should be at least 70% and not more than 110% of just value (36 M.R.S. §327), but the published returns show real towns on both sides of that band. Pull your town's number before you compare your assessment to anything.

Category	Maine
Assessment basis	Assessed value ÷ just (market) value = your town's certified ratio (§383); no single statewide percentage
Statutory standard	Ratio of at least 70%, not more than 110% of just value (§327)
Appeal deadline	185 days from your town's commitment date (§841(1))
Where you file	Written abatement application to the municipal assessor
If the assessor is silent	No written decision within 60 days = deemed denied (Bulletin No. 10)
First appeal	60 days to the local Board of Assessment Review — or the county commissioners if your town hasn't adopted a board (§843(1))
Next rung	Superior Court, Rule 80B, within 30 days — either party may appeal (§843(1))
Assessment cap	None — Maine's relief programs are exemptions, credits, and deferrals, not growth caps

The trap that ends appeals before they start

Under 36 M.R.S. §706-A, an assessor may require you to furnish a true and perfect list of your property and to answer written inquiries about it, and you have 30 days to respond. Ignore that request and the consequences are severe: if the notice came by mail, you "may not apply to the assessor for an abatement or appeal" unless you furnish the list and answers with your application. Refusing or neglecting to answer bars an appeal. If anything from your assessor is sitting unopened, open it first.

What actually wins

The burden is on you, and Bulletin No. 10 is blunt that the threshold is high: the assessment is presumed valid, and you must show it is "manifestly wrong" — that the property was substantially overvalued and an injustice resulted, that there was unjust discrimination in the valuation, or that the assessment was fraudulent, dishonest, or illegal. Maine's constitution is the backstop for all three: taxes must be "apportioned and assessed equally according to the just value thereof" (Me. Const. Art. IX, §8).

In practice that means two things. First, check your property record card for plain errors — Bulletin No. 10's own examples are a build year recorded as 1994 instead of 1949, or a bill that says 12 acres when you own 1.2. Those are the cheapest wins in property tax. Second, if the number itself is wrong, bring recent, nearby comparable sales of homes genuinely like yours, converted to your town's certified ratio before you compare. An assessed-vs-market comparison that skips the ratio step is the single most common way a Maine homeowner talks themselves into an appeal they can't win — or out of one they could.

One more figure that runs on the same ratio: the Homestead Exemption takes $25,000 off your value, but the exemption is multiplied by your town's certified ratio first — MRS's own example is $25,000 × .80 = $20,000 in a town assessing at 80%. Applications are due April 1.

Get your case built

PROppeal pulls licensed comparable sales for your Maine address, applies your town's certified ratio instead of assuming 100%, and tells you straight whether your assessment is genuinely out of line — before your 185 days from commitment run out.

Property tax rules and deadlines vary by jurisdiction and can change — verify with your county before relying on this.