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Property Tax Abatement Deadlines by Town in Greater Portland, Maine

Published August 14, 2026 · 8 min read

Your tax bill arrives in the fall, the number is bigger than last year, and you decide to do something about it. Almost everyone does that something in January, when the second half payment lands and the annoyance comes back. In three towns in this region, January is already too late, or nearly.

Maine gives you 185 days to ask your assessor to lower your assessment. Not 185 days from the bill, not from the due date, and not a calendar date the state sets. It is 185 days from your town's commitment date, the day your assessor formally hands the tax roll to the tax collector. Commitment happens weeks before the bill reaches your mailbox, and in Greater Portland it happens on eleven different days spread across nearly three months.

So the most useful fact about appealing your property tax in Maine sits on a town page you have probably never opened. Some towns publish the deadline. Some publish only the formula. One publishes neither.

The 185 days, and where the number comes from

36 M.R.S. section 841(1) is one sentence long on this point. The assessors, on written application filed within 185 days from commitment stating the grounds for an abatement, may make such reasonable abatement as they consider proper to correct any illegality, error or irregularity in assessment, if the taxpayer has complied with section 706-A.

Maine Revenue Services says the same in Property Tax Bulletin No. 10, revised May 1, 2026. That bulletin is current, accurate and free. It also does not tell you your town's commitment date, and no state page does, because there is no statewide list. Twelve town websites hold twelve separate answers.

Commitment dates and deadlines, town by town

Every row below was read on the town's own site or on the Cumberland County Regional Assessing site on August 14, 2026.

Read the second column before the third. Nine of these twelve have not committed for 2026-27 yet, so the dates they show you today belong to last year and every one has already passed. Portland's assessor page still leads with a February 26, 2026 deadline and a line saying current bills will be mailed in September 2025. Nothing flags either as stale.

Three towns have committed. If you own in Westbrook, South Portland or Windham, your clock is running right now.

The weekend problem, and it is real in Westbrook

Add 185 days to Westbrook's July 9, 2026 commitment and you land on January 10, 2027. That is exactly what Westbrook publishes, and it is arithmetically correct. January 10, 2027 is a Sunday. The city publishes it with an end of business day cutoff of 4:00 PM.

South Portland committed a week later, on July 16, 2026. Its 185th day is Sunday, January 17, 2027, and the next day is Martin Luther King Jr. Day. South Portland publishes January 19, a Tuesday, and its appeals page says in writing that the application must be filed within 185 days after the commitment date, or the first business day thereafter.

Three other towns did the same rollover silently last year. Cape Elizabeth's 185th day was Sunday March 1, 2026 and it published March 2. Yarmouth's was Sunday March 29 and it published March 30. Falmouth's was Saturday April 4 and it published April 6.

Here is what we can and cannot tell you. Section 841 says 185 days and says nothing about weekends. Maine's general rollover rule at 1 M.R.S. section 71(13) covers a report required by legislation or another legislative instrument to be filed by a date certain, and a taxpayer's abatement application is not a report required by legislation. We found no provision in Title 36 that extends the 185 days and no Maine appellate decision on the point. Four towns here publish a deadline later than the 185th day, and one publishes a deadline that falls on a Sunday. That is a divergence, not a holding, and we will not write it as one.

The safe answer is unglamorous. Treat the 185th day as the deadline. If you need the extra day, call your assessor and get it in writing first.

Four ways to lose before you start

You ignored a letter from the assessor. Section 706-A gives you 30 days to answer a request for a true and perfect list or for information about your property, extendable by 30 more in writing. If the assessor mailed the request and you never answered, you may not apply for an abatement or appeal one. This is the least written about trap in Maine property tax and it disqualifies you before any argument about value.

Your house is worth $500,000 or more and you have not paid. Sections 843(4) and 844(4) suspend your appeal until you have paid the greater of the undisputed taxes or last year's taxes, capped at this year's amount. That threshold was written for commercial property and now catches ordinary single family homes across this region.

You brought a disagreement instead of evidence. The assessment is presumed valid. Bulletin No. 10 puts the standard at manifestly wrong, citing Roque Island Gardner Homestead Corp. v. Town of Jonesport, 2017 ME 152. Ask the assessor for your property record card and check it for plain errors in acreage, square footage or year built. That is where most successful abatements come from.

You used the form on the website. Scarborough's linked abatement application still says fiscal year 2025 valuations were committed on August 21, 2024 and that the appeal period ended February 24, 2025. Brunswick's application link returns a 404. Both checked August 14, 2026. Ask the office for the current form.

Where the appeal goes if the assessor says no

You have 60 days from the notice of denial. If the assessor gives you no written decision within 60 days of your filing, section 842 deems your application denied and your 60 days runs from there.

All twelve towns here have adopted a board of assessment review, so none routes appeals to the Cumberland County commissioners. One wrinkle: Gorham's own page describes its board's purpose as reviewing applications on behalf of the assessor and making recommendations to the assessor, and cites Title 30-A rather than 36 M.R.S. section 843, which describes a board that grants abatements itself. We are not saying Gorham's board lacks that power, and no other page compares the two. If you are appealing in Gorham, ask which body issues the decision.

Three of these towns have no town assessor at all. Falmouth, Gorham and Yarmouth, along with Baldwin, Casco and North Yarmouth, are served by Cumberland County Regional Assessing at 27 Northport Drive in Portland, 207-699-2475, open weekdays 8:00 to 4:00. You file with the county office, not your town hall.

If you miss the 185 days

It is not necessarily over, but you lose the part that matters. Section 841(1) lets the assessor abate on their own initiative within one year of commitment. That is discretion, not a right, and there is nothing to appeal if they decline. After one year and within three you can go to the municipal officers for an illegality, error or irregularity, but that route explicitly cannot correct an error in valuation, which is what almost everyone is complaining about.

What to do in the next two weeks

Find your town's commitment date, not its due date. If your town has not committed yet, this is the good half of the year: pull your property record card now, check the acreage and the square footage and the finished basement that is not finished, and collect three recent sales of comparable houses near you. If your town has committed, write the 185th day on a calendar today.

Two other pages here are worth reading alongside this one. Property taxes by town in Greater Portland explains why comparing mill rates across these towns is close to meaningless without the certified ratio, which runs from 57 percent in Cumberland to 100 percent in seven of the twelve. And the Maine homestead exemption has its own April 1 deadline, and a denial of it is appealed through this same abatement process.

FAQ

What is the deadline to file a property tax abatement in Maine?

185 days from your municipality's commitment date, under 36 M.R.S. section 841(1). There is no statewide calendar date. Across twelve Greater Portland towns, commitment dates ranged from July 9 to October 1, which puts the deadlines anywhere from January to April.

When is Portland Maine's property tax abatement deadline?

Portland's last published deadline was February 26, 2026, exactly 185 days from its August 25, 2025 commitment. Portland had not published a 2026-27 commitment date as of August 14, 2026, and its assessor page still displays the expired 2026 deadline with no notice that it has passed.

What is a commitment date and why does it matter?

It is the day the assessor formally commits the tax roll to the tax collector. Everything about your appeal is counted from it: your 185 days to apply, and the assessor's own one year window to abate. It usually falls a few weeks before bills are mailed.

Do I have to pay my tax bill before appealing in Maine?

If your property is valued at $500,000 or more, yes. Sections 843(4) and 844(4) suspend the appeal until you have paid the greater of the taxes not in dispute or the prior year's taxes, capped at the current year's amount. Below $500,000 that requirement does not apply, though interest still accrues on anything unpaid.

What happens if the assessor never answers my abatement application?

After 60 days from filing, section 842 treats it as denied and you may appeal as though you had received a written denial. Failure to send you a decision does not cost you the right to appeal.

Can I still get an abatement after the 185 days?

Sometimes, but not as a right. The assessor may abate on their own initiative within one year of commitment. After one year and within three years, the municipal officers may correct an illegality, error or irregularity, but they are barred from correcting an error in valuation.

Every town figure here was read on the municipality's own site or on the Cumberland County Regional Assessing site on August 14, 2026. Nine of the twelve had not published a 2026-27 commitment date that day. We will re-read all twelve after the autumn commitment season and replace the prior year rows.