Maine Property Tax Rates by Town: Portland, Lewiston, and Beyond

Maine's property tax is set entirely at the municipal level — the state sets no uniform tax rate. This means the effective property tax on a home in Lewiston can be more than double the rate on an equivalent home in a low-rate rural town. For a first-time buyer comparing two properties across town lines, the mill rate difference can represent several thousand dollars per year.

Understanding how the system works, what the rates look like across Maine's major cities, and what the homestead exemption does to your actual bill is essential before you make an offer.

How Maine Property Taxes Are Calculated

Maine assessors value property at 100% of "just value" — defined by state law as market value. The tax bill is then calculated as:

Annual property tax = Assessed value × Mill rate

A mill rate of 20 means $20 per $1,000 of assessed value, or equivalently 2% of the assessed value.

In practice, many towns assess at something other than full market value — the gap between local assessed values and actual market values is captured in the certified ratio. If a town has a certified ratio of 87%, it means the local assessed values are, on average, 87% of market value. This is worth understanding because the homestead exemption interacts with the certified ratio.

Property Tax Rates in Maine's Major Cities

Mill rates change annually as municipalities set budgets. The figures below reflect recent rates and should be verified with current year data from the local assessor before closing.

Portland Portland's mill rate has hovered around 18 to 20 mills in recent cycles — approximately $18 to $20 per $1,000 of assessed value. On a $550,000 Portland home assessed near market value, the annual property tax before the homestead exemption runs roughly $9,900 to $11,000.

After applying the Maine Homestead Exemption ($25,000 reduction in assessed value), the savings at a 19-mill rate would be approximately $475 per year.

Portland's assessed values have historically been somewhat below market value, with certified ratios in the range of 70% to 90% depending on the most recent revaluation cycle. Buyers should check the current certified ratio with the Portland Assessor's office.

Lewiston Lewiston has one of the higher property tax rates in Maine — approximately $19 to $21 mills in recent years. On a $340,000 home at 20 mills and a certified ratio near 100%, annual property taxes would run approximately $6,800.

The higher mill rate reflects Lewiston's urban service demands relative to its tax base. Buyers moving from suburban Massachusetts to Lewiston for affordability sometimes underestimate the property tax burden, which is comparable to — or higher than — many Massachusetts suburbs on a rate basis, though the lower absolute prices mean the dollar amount is still lower.

Bangor Bangor's mill rate has typically run in the range of 16 to 18 mills. On a median-priced home of approximately $279,000 at 17 mills, annual property taxes run roughly $4,750.

Augusta Augusta, as the state capital, carries a mill rate in a similar range to Bangor — typically 16 to 20 mills depending on the year. Property values in Augusta are somewhat lower than Bangor, which translates to moderate total tax bills even at higher rates.

Rural Towns Mill rates in rural Maine vary considerably. Towns with low service demands and stable tax bases sometimes run 10 to 14 mills. However, low mill rates can coexist with assessments far below market value — meaning the effective tax rate as a percentage of actual home value may be more comparable to cities than the nominal mill rate suggests.

Why Your Assessed Value Matters

A frequently misunderstood aspect of Maine property taxes is that your assessed value does not automatically reset to the purchase price when you buy. Maine towns reassess all properties on their own schedules — some towns complete full revaluations every 8 to 12 years, others on longer cycles. Individual sales do not trigger reassessment.

This cuts both ways. If a town's assessed values are running well below market value (a common situation after rapid price appreciation), your tax bill for the first several years may be lower than the mill rate applied to your purchase price would suggest. But when the revaluation eventually happens, assessed values jump to market value and tax bills increase substantially — often surprising buyers who had budgeted on the old rate.

Before closing, check with the local assessor:

• What is the current certified ratio for this town?
• When was the last full revaluation?
• Is a revaluation currently underway or scheduled?

The answers tell you whether your first-year tax bill is representative of what you will pay long-term.

The Homestead Exemption's Effect by Town

The Maine Homestead Exemption reduces your assessed value by $25,000. The actual annual savings depend on your town's mill rate and certified ratio.

Approximate annual savings at various mill rates:

These savings are not transformative, but they are automatic and perpetual once you qualify. Apply by April 1 of the tax year in which you want the reduction to take effect.

The Property Tax Fairness Credit

Maine offers a refundable state income tax credit — the Property Tax Fairness Credit — for residents whose property tax payments exceed a defined percentage of household income. The credit is claimed on Form 1040ME and can return up to $1,000 (or $2,000 for residents aged 65 or older or those with disabilities).

This credit is separate from the homestead exemption and available to both homeowners and renters (renters calculate their credit based on an assumed portion of rent that covers property taxes). For moderate-income buyers in high-mill-rate towns, the Fairness Credit can represent meaningful annual savings on top of the homestead exemption.

A Note on Comparing Towns

When comparing properties across towns, the relevant number is the effective tax rate — what you will actually pay annually as a percentage of your purchase price — not the nominal mill rate alone. To calculate:

Effective rate = (Mill rate × Certified ratio) ÷ 1,000

If a town has a 20-mill rate but a 75% certified ratio (meaning assessed values are 25% below market), the effective rate on a purchase at market price is actually:

20 × 0.75 / 1,000 = 1.5% of purchase price

A town with a 14-mill rate and a 95% certified ratio has an effective rate of:

14 × 0.95 / 1,000 = 1.33% of purchase price

The town with the "lower" nominal mill rate is not necessarily cheaper on an effective basis.

The Maine First-Time Home Buyer Guide includes guidance on reading assessor data, interpreting certified ratios, and factoring property taxes into your total cost of ownership calculation before making an offer.

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