Maine mill rates explained: what your town's rate means for your tax bill

Last updated 2026-07-09

What is a mill rate and how does Maine use it?

A mill rate is the tax per $1,000 of assessed property value. The word "mill" comes from the Latin "millesimum," one-thousandth. A mill rate of 10.00 means you owe $10 for every $1,000 your property is assessed at.

Maine runs this at the local level. Each municipality, not the state, sets its own mill rate every year after the town votes a budget and the assessor certifies the total taxable valuation. The state's job is oversight and equalization, handled by Maine Revenue Services ^[1].

The math is short. Assessed value $350,000, mill rate 14.50: ($350,000 / 1,000) x 14.50 = $5,075. No county multiplier stacked on top in most cases.

Maine has county government, but counties don't levy property tax directly on homeowners the way some states do. County costs get folded into municipal budgets through county assessments, so your bill shows one combined mill rate, not separate state, county, and town lines ^[1].

What are the current mill rates for Maine towns?

Maine Revenue Services publishes mill rate data for every municipality each year through its Property Tax Division. The most recent complete dataset covers fiscal year 2022-2023, with 2023-2024 figures posted for most towns ^[1].

Here is a sample of real reported rates to show the range:

Municipality	County	Mill Rate (2022-2023)
Portland	Cumberland	18.00
Bangor	Penobscot	23.00
Augusta	Kennebec	19.30
Lewiston	Androscoggin	21.80
Biddeford	York	18.90
South Portland	Cumberland	18.00
Brunswick	Cumberland	17.30
Scarborough	Cumberland	15.10
Falmouth	Cumberland	9.90
Cape Elizabeth	Cumberland	12.90
Yarmouth	Cumberland	13.20
Kennebunkport	York	7.30
Carrabassett Valley	Franklin	6.95

These figures come from the Maine Revenue Services annual compilation ^[1]. Verify your own town's current rate with the local assessor or the MRS municipal rate table, because rates reset every fiscal year.

The pattern holds up town to town. Urban service centers with large school budgets and lower per-capita property values (Bangor, Lewiston, Augusta) carry high mill rates. Wealthy coastal and suburban towns spread a similar levy over a much larger tax base, which pushes the rate down. Carrabassett Valley, home to Sugarloaf, has heavy commercial value, so its residential rate sits near 7 mills.

For towns not listed here, the MRS Property Tax Division page lets you download the full municipal rate table ^[1].

What is the mill rate for Portland, Maine specifically?

Portland's mill rate for fiscal year 2022-2023 was 18.00 mills, per Maine Revenue Services data ^[1]. The city ran a townwide revaluation effective in fiscal year 2021-2022, which reset assessed values closer to market. That reset raised most assessed values sharply, so even with the rate steady, plenty of homeowners saw bigger bills.

Portland's assessor posts the current mill rate and assessment ratio on the city's main website ^[2]. Start there when you're doing the math on a specific parcel, because the city sometimes adjusts the presented rate as the final budget certifies.

Portland homeowners also get the state Homestead Exemption. As of 2024, Maine's state-funded Homestead Exemption removes $25,000 from the just value of a primary residence before the mill rate applies ^[3]. At 18.00 mills, that exemption alone saves $450 a year. If you qualify and haven't filed, file now. It applies going forward, and some cases pick up a retroactive credit.

Searches for the Portland mill rate spike in late spring, when the city certifies its new budget. The rate for the coming fiscal year usually locks in around June ^[2].

How does Maine calculate the mill rate each year?

The formula is short: mill rate = (total municipal levy / total taxable assessed value) x 1,000 ^[4].

Each side of that fraction has its own drivers. The levy is the amount the municipality has to raise from property taxes after it subtracts state aid, excise taxes, fees, and other revenue. The town meeting or city council votes the budget, then the assessor figures how much property taxes must cover.

The denominator is total taxable assessed valuation, which the assessor certifies each year. Maine law requires assessment at "just value," which the state reads as 100% of fair market value ^[4]. In practice, the state measures each town's assessment ratio (assessed value as a percentage of market value) through its certified ratio program. A certified ratio of 80% means assessments run about 20% below market.

When the certified ratio drops well under 100%, the state requires the town to commit to a revaluation plan. This touches you directly. A low ratio can hide whether your own assessment is fair next to your neighbors'.

Maine Revenue Services certifies each municipality's ratio annually and publishes it beside the mill rates ^[1]. If your town's ratio is 80% but your home got assessed as if the ratio were 100%, you're paying more than your neighbors in proportional terms. That's grounds for an appeal.

Why do mill rates vary so much between Maine towns?

Four things drive the spread. School budgets come first. Maine funds schools through a mix of state subsidy and local property taxes. Towns with fewer students, lower labor costs, or more state subsidy need less local revenue. Towns with big school systems and a high local share push their mill rate up hard.

The property value base is second. Kennebunkport has high average property values. A modest levy divided over a large total valuation lands at a low mill rate. Bangor has more properties at lower average value, so the same dollar levy produces a higher rate per $1,000.

Commercial and industrial property is third. Maine Revenue Services data consistently shows that towns with a strong commercial or industrial base fund services at a lower residential mill rate, because commercial property adds to the denominator ^[1]. Towns near major employers or resort developments often run low residential rates for exactly this reason.

Municipal debt service is fourth. Towns carrying large bonds for infrastructure, schools, or facilities add those annual payments to the levy. Older communities that built water systems and municipal buildings decades ago often have real debt service baked into their rates.

You can't change any of these. But they tell you whether your town's rate is structurally high (and likely to stay there) or briefly elevated by a one-time capital project.

How do you calculate your Maine property tax from the mill rate?

Three steps.

Step 1: Find your assessed value. It's on your tax bill or your municipality's online assessing database. Most Maine towns now run public GIS or assessing portals where you can pull up any parcel.

Step 2: Subtract exemptions. Maine's Homestead Exemption removes $25,000 from just value for qualifying primary residences ^[3]. Veterans may get more. The Blind Persons Exemption removes $4,000. Total the exemptions and subtract from assessed value.

Step 3: Apply the mill rate. Divide the remaining assessed value by 1,000, then multiply by the mill rate.

Example: assessed at $320,000, Homestead Exemption of $25,000, taxable value $295,000, mill rate 15.50. Tax = (295,000 / 1,000) x 15.50 = $4,572.50.

Here's what many homeowners miss. If your town's certified ratio is below 100%, the "just value" (market value) the state uses for equalization can differ from your assessed value. For the bill itself, only assessed value counts. For an appeal, you compare assessed value to what the property would actually sell for, adjusted for the certified ratio ^[4].

Some towns bill twice a year. Others bill once. Check your town's schedule. Late payment triggers interest at a rate the municipality sets, usually 7 to 8% a year in Maine ^[4].

What Maine property tax exemptions reduce the effective mill rate impact?

Exemptions don't touch the mill rate. They cut the assessed value the rate applies to, which lowers your bill just as effectively.

The Homestead Exemption is the big one for most homeowners. As of 2024, it exempts $25,000 of just value for Maine residents who own and occupy their primary residence as of April 1 each year ^[3]. The state reimburses municipalities for 70% of the cost, so local government doesn't eat the full amount. You apply once with your local assessor, and it renews automatically while you stay eligible.

The Veterans Exemption has tiers. Non-paraplegic veterans who served during a recognized war period get $6,000 off just value. Paraplegic and blind veterans get larger exemptions ^[3]. Spouses and widows or widowers of eligible veterans may also qualify.

Maine's Property Tax Fairness Credit is a refundable income tax credit for lower-income homeowners and renters. It's not an exemption, but it puts cash back in your pocket when your property tax (or rent-equivalent) tops a set share of household income ^[5]. The maximum credit for homeowners was $1,000 in recent years. Check current Maine Revenue Services guidance, because the legislature adjusts this from time to time ^[5].

Tree Growth, Farm and Open Space, and Working Waterfront Valuation all lower assessed value for qualifying land by valuing it at current use rather than market. They mean little to most residential homeowners but a lot to rural landowners.

If you haven't filed for the Homestead Exemption, your assessor can walk you through the one-page form. At 18 mills, a missed $25,000 exemption costs you $450 a year, every year.

How do you appeal a Maine property assessment when the mill rate makes it too expensive to do nothing?

The mill rate turns every $10,000 of over-assessment into a real annual cost. At 20 mills, a $30,000 over-assessment costs $600 a year. Over five years before the next revaluation, that's $3,000. The appeal process is built to work without a professional.

Maine's appeal has two stages. First you appeal to the assessor directly. Maine law requires that first step ^[6]. The deadline is 185 days from the date the tax commitment is sent (the date taxes were committed by the municipality). Miss it and you lose appeal rights for that year.

Your written abatement application goes to the assessor. Bring your evidence: recent comparable sales in your neighborhood, a recent appraisal if you have one, documentation of condition problems (deferred maintenance, obsolete systems, flooding), and the assessed values of similar nearby properties from the public database. The assessor has up to six months to respond ^[6].

If the assessor denies your application or goes silent past six months, you have 60 days to appeal to the Maine Board of Assessment Review (for towns without a local board) or your municipality's local board ^[6]. The state Board of Assessment Review hears appeals from smaller municipalities. Larger cities like Portland run their own local boards.

If the board rules against you, the next step is Superior Court. That usually takes an attorney and rarely pays off unless the dollars are large.

Most homeowner cases settle at the assessor level. Bring real data, stay professional, and keep the focus on comparables. If you want a clean way to organize your evidence and write a convincing abatement letter without handing a contingency firm 30 to 40% of your savings, the TaxFightBack DIY appeal kit walks you through the whole process.

One common mistake: people argue the mill rate is unfair. The assessor cannot change the mill rate. Only the budget process does that. What the assessor can change is your assessed value. Keep your appeal on whether your assessed value reflects market value ^[4].

What are the deadlines to appeal a Maine property tax assessment?

Maine deadlines are strict, and missing one kills your appeal for that year.

Deadline	Event	Statute
April 1	Assessment date (ownership and condition as of this date)	36 M.R.S. § 502
Varies by town (typically Aug-Oct)	Tax commitment date (when bills are issued)	36 M.R.S. § 709
185 days after commitment	Deadline to file abatement application with assessor	36 M.R.S. § 841
60 days after assessor denial or 6-month non-response	Deadline to appeal to Board of Assessment Review or local board	36 M.R.S. § 843
Within 60 days of board decision	Deadline to appeal to Superior Court	36 M.R.S. § 844

The 185-day window is the one homeowners blow. People get a bill in August, set it aside, get busy through the fall, and realize in February that the assessment looks wrong. By then the window may be shut ^[6].

The April 1 assessment date matters for exemptions too. You must own and occupy your home as of April 1 to qualify for the Homestead Exemption that year. Close on a purchase April 2, and you wait until the next year ^[3].

Your assessor can tell you the exact commitment date for the current year. That date starts the 185-day clock. Write it down.

How does Maine's certified ratio affect what you actually owe?

Maine's certified ratio is the percentage of market value at which a town actually assesses property. Maine Revenue Services calculates it by comparing recent sale prices to assessed values in each municipality ^[1].

A certified ratio of 90% means the average assessed value equals 90% of market value. A home that sold for $400,000 would typically be assessed around $360,000. That's legal and common. Towns don't have to reassess constantly.

The ratio changes your appeal math. When you argue your home is over-assessed, the standard isn't 100% of market value. It's the town's certified ratio times market value. Maine courts and the Board of Assessment Review apply this rule ^[4].

Example: your town's certified ratio is 85%. Your home is assessed at $340,000. You think it's worth $350,000 on the market. At 85%, the correct assessment would be $297,500. Even if you agree the home is worth $350,000, you may still have a valid appeal, because $340,000 sits well above what the ratio says you should owe.

This ratio-adjusted argument is a real strategy that most homeowners never hear about. Find your town's certified ratio in the Maine Revenue Services annual municipal rate table ^[1], then run the numbers on your own assessment.

Are Maine mill rates likely to go up or down in the next few years?

Be honest about this: the structural pressure in most Maine towns points toward rates staying elevated or rising a bit. Here's why.

State education funding through the Essential Programs and Services formula has grown in recent years, which should in theory help towns trim their local share. But municipal operating costs, especially public safety, roads, and wastewater treatment, have climbed with inflation. Construction costs for any capital project run well above five years ago. Personnel costs, driven by competitive wages and benefits, keep going up.

The towns most likely to get mill rate relief are the ones going through revaluations. When a town that hasn't revalued in 15 years finally updates assessments to current market, the total taxable valuation jumps. If the levy stays flat, the bigger denominator drops the mill rate. Portland saw this after its 2021-2022 revaluation. But the lower rate hit higher assessed values, so many homeowners still paid more even as the headline rate fell.

Nobody has a reliable statewide forecast for Maine mill rates, and any source claiming one is guessing. The closest proxy is the Maine Municipal Association's budget tracking, which follows municipal appropriations and revenue trends ^[7]. Their data shows most Maine towns raising budgets in the 3 to 6% range annually lately, which pushes rates up unless property values climb alongside.

Where can you find official Maine mill rate data for your town?

Maine Revenue Services is the authoritative source. Its Property Tax Division publishes an annual report with the certified mill rate for every Maine municipality ^[1]. The table usually updates each fall for the prior fiscal year, with a lag of roughly six to twelve months.

For the current rate, go straight to your local assessor. Every Maine municipality has one (some share an assessor through an interlocal agreement), and they are required to provide the current commitment rate. The Maine Municipal Association keeps a directory of town offices and their assessing contacts ^[7].

Portland's assessing office runs its lookup through the city website ^[2]. Bangor, Lewiston, Augusta, and South Portland all maintain online assessing databases where you can pull individual parcels and see the current rate applied.

For comparing towns, the Maine Revenue Services municipal rate table is the single best tool. It lists assessed value, certified ratio, and mill rate side by side for every municipality, so you can see at a glance whether your town taxes at a higher or lower effective rate than its neighbors ^[1].

One practical tip for buyers: look up both the current mill rate and the certified ratio before you commit to a town. A town at 7 mills with a 60% certified ratio actually taxes at a higher effective rate than a town at 12 mills with a 100% ratio, because the first town's assessments are artificially low and a revaluation is coming.

Frequently asked questions

What is the average mill rate in Maine?

No single average means much given the spread, but Maine Revenue Services data for 2022-2023 shows most municipalities between 9 and 22 mills. The population-weighted center sits around 14 to 17 mills, pulled up by the larger cities. Small rural towns often run 8 to 13 mills. Urban service centers like Bangor and Lewiston land at the high end, above 20 mills.

How often do Maine mill rates change?

Every year. Each municipality sets a new mill rate after its annual budget vote, usually in spring or early summer for towns on a July 1 fiscal year. The rate is certified when the assessor commits the tax list. Your 2024-2025 rate will differ from the prior year's, sometimes sharply, especially if the budget shifted or a revaluation updated assessed values.

Does Maine have a statewide property tax rate?

Not in the usual sense. Maine has a statewide property tax on certain high-value property through the school funding formula, but for most homeowners the relevant tax is set entirely at the municipal level. There is no single Maine state mill rate applied to all residential property. Your town's rate is the one that hits your bill.

How do I find my specific property's assessed value in Maine?

Start with your municipality's assessing office. Most Maine cities and many towns have online parcel lookup tools through their websites or a GIS portal. You can also call or visit the assessor directly. Your property tax bill shows the assessed value used that year. Maine Revenue Services does not keep individual parcel records; that's a local function.

Can I lower my Maine property taxes by challenging the mill rate?

No. The mill rate comes out of the municipal budget process, not the assessment process. You cannot appeal the rate itself to the assessor or the Board of Assessment Review. The only way to cut your bill through an appeal is to reduce your assessed value. A 10% reduction in assessed value cuts your bill by 10%, whatever the mill rate is.

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

185 days from the date the municipality commits (issues) the tax list, under 36 M.R.S. § 841. That date varies by town but usually falls in August, September, or October. Miss the window and you cannot appeal for that tax year. Call your assessor for the exact commitment date, count forward 185 days, and set a calendar reminder.

Does Maine have a homestead exemption, and how much does it save?

Yes. Maine's Homestead Exemption removes $25,000 from the just (market) value of a qualifying primary residence before the mill rate applies. At 15 mills, that's $375 saved a year. At 20 mills, it's $500. You must own and occupy the property as of April 1, and you apply once with your local assessor. The state reimburses municipalities 70% of the tax impact.

Are commercial properties taxed at a different mill rate in Maine?

Maine has no formal split-rate system where commercial and residential properties face different mill rates. Both classes use the same rate within a municipality. But commercial property is assessed at just value without the Homestead Exemption, and large commercial properties may be assessed using the income approach rather than sales comparison, which can produce different effective rates in practice.

What happens if my Maine town hasn't done a revaluation in years?

Over time, individual assessments drift out of line with market values, and some properties get under-assessed relative to others. Maine Revenue Services tracks this through the certified ratio program. If your town's ratio falls too far below 100%, the state can require a revaluation plan. For you, a long gap since the last revaluation often means your assessment rests on outdated data, which is worth checking.

How does the Maine Property Tax Fairness Credit work?

It's a refundable credit on your Maine income tax return for homeowners and renters whose property taxes (or rent equivalent) top a set percentage of income. In recent years the maximum was $1,000 for homeowners. You claim it on Schedule PTFC with Maine Form 1040ME. Income limits apply. Maine Revenue Services publishes current thresholds each year, so check their individual income tax guidance.

If my neighbor's house is similar to mine but assessed lower, is that grounds for an appeal?

Yes, potentially. Maine's standard is that assessments must be equitable among similar properties within a town. Document that comparable homes carry lower assessed values and you have evidence of unequal treatment. Pull five to ten nearby comparable parcels from your town's public database, note their assessed values and features, and include the analysis in your abatement application. Assessors take equity arguments seriously.

Does Maine charge interest on unpaid property taxes, and how much?

Yes. Maine municipalities charge interest on overdue property taxes at a locally set rate, capped by state law. Recent practice puts rates at 7 to 8% a year, but verify your town's rate on your bill or with the town office. Interest accrues from the due date. Unpaid taxes can produce a lien, and after three years of nonpayment the municipality can foreclose.

How is Bangor's mill rate so much higher than nearby towns?

Bangor's rate near 23 mills reflects its role as a regional service center. It funds a full municipal service structure (fire, police, public works, parks, airport) plus a school system, on a property base that, while large, doesn't match the per-capita wealth of smaller surrounding towns. Towns like Orono or Hampden run lower rates partly because their residents use Bangor services without paying into Bangor's tax base.

Sources

1. Maine Revenue Services, Property Tax Division: Maine Revenue Services publishes annual mill rates, certified ratios, and total assessed valuations for every municipality in the state.
2. Maine Revenue Services, Property Tax Exemptions guidance: Maine's Homestead Exemption removes $25,000 of just value from qualifying primary residences; Veterans and other exemptions are administered locally under MRS guidance.
3. Maine Revised Statutes, Title 36 (Taxation): Maine law requires property to be assessed at just value (market value) under 36 M.R.S. § 701; abatement deadlines are set at 185 days under § 841 and appeal rights under §§ 843-844.
4. Maine Revenue Services, individual income tax and Property Tax Fairness Credit guidance: Maine's Property Tax Fairness Credit provides a refundable income tax credit for homeowners and renters whose property taxes exceed a percentage of their income, with a recent maximum of $1,000 for homeowners.
5. Maine Revised Statutes, Title 36, § 841: The 185-day abatement filing deadline and subsequent 60-day appeal windows to the Board of Assessment Review and Superior Court are established in 36 M.R.S. §§ 841-844.
6. Maine Municipal Association: The Maine Municipal Association tracks annual municipal budget appropriations and revenue trends and maintains a directory of Maine town offices and assessing contacts.
7. Maine Assessors Association: The Maine Assessors Association maintains a directory of municipal assessors across the state.
8. Maine Revenue Services, certified ratio and equalization program: Maine Revenue Services calculates each municipality's certified ratio annually by comparing recent sales prices to assessed values, and uses this to equalize assessments for state aid purposes.