Maine Mortgage Calculator (with Maine Property Taxes & Insurance)

Maine has one of the higher effective property tax rates in New England, and this calculator models that with a baked-in 1.28% effective rate applied to the home's purchase price. Because Maine funds a large share of municipal and school budgets through local property taxes, the tax component of a Maine mortgage payment is often larger, relative to the loan itself, than it would be for a similarly priced home in a lower-tax state.

This calculator combines a standard 30-year fixed-rate amortization schedule with a Maine-specific property tax estimate and a flat monthly insurance placeholder to produce a full PITI (principal, interest, taxes, insurance) monthly payment rather than just the loan-only figure a bare-bones mortgage calculator would show.

1. Down payment and loan principal. The down payment percentage is applied to the home price, and the remainder becomes the loan principal: $\text{Principal} = \text{Price} \times (1 - \text{Down\%})$.
2. Principal and interest. The loan principal is amortized over a fixed 360-month (30-year) term using $A = P \times \frac{i(1+i)^n}{(1+i)^n - 1}$, where $i$ is the monthly rate (annual APR divided by 12) and $n = 360$.
3. Property tax estimate. Maine's statewide effective property tax rate is modeled at 1.28% of the home's purchase price, applied annually and divided by 12: $\text{Monthly Tax} = \text{Price} \times 0.0128 / 12$.
4. Insurance estimate. A flat $125 monthly placeholder represents a typical homeowners insurance premium.
5. Total monthly PITI. Principal and interest, monthly property tax, and monthly insurance are summed for the full housing payment.

The amortization schedule is calculated period by period using decimal-precision math across all 360 monthly payments, so cumulative interest and principal figures reconcile exactly against the reported totals rather than drifting from rounding error over the 30-year horizon.

Using the default scenario: a $380,000 home, 20% down, and a 6.5% APR 30-year fixed loan.

1. Down payment: $380,000 \times 20\% = \$76,000$.
2. Loan principal: $380,000 - \$76,000 = \$304,000$.
3. Principal and interest: amortizing $304,000 at 6.5% over 360 months yields a monthly payment of approximately $1,921.48.
4. Property tax: $380,000 \times 1.28\% / 12 = \$405.33$ per month.
5. Insurance: a flat $125 per month.
6. Total PITI: $1,921.48 + \$405.33 + \$125 = \$2,451.82$ per month.
7. Total interest over 30 years: amortizing $304,000 at 6.5% for 360 months produces roughly $387,700 in cumulative interest over the full term.

Compare this to the same loan amount and rate modeled with Louisiana's much lower 0.55% effective property tax rate: the property tax line there would be under $175 a month, versus over $405 a month here. That roughly $230 monthly gap illustrates how much effective property tax rates alone can swing a Maine buyer's real housing cost relative to a lower-tax state, even with an identical mortgage.

• Municipal mil rate variation. Maine property tax is set by each municipality's mil rate (tax per $1,000 of assessed value), and these rates vary substantially between towns, from resort and coastal communities with lower rates to inland towns with higher rates needed to fund schools and services. The 1.28% figure here is a statewide effective-rate approximation, not a town-specific number.
• The Maine Homestead Exemption. Maine offers a Homestead Exemption that reduces the taxable assessed value of an owner-occupied primary residence by $25,000, which lowers many homeowners' actual tax bills below what a flat percentage-of-price estimate suggests.
• Maine's Property Tax Fairness Credit. Some Maine homeowners qualify for a state income tax credit that offsets a portion of property tax paid, based on income; this is not reflected in the monthly PITI figure shown here.
• PMI (private mortgage insurance). Down payments below 20% typically require PMI, which is not included in this calculator's output.
• HOA dues, heating costs, and closing costs. Maine winters can mean significant heating expenses that are part of true homeownership cost but are outside the scope of a PITI mortgage calculator.

• Treating 1.28% as the rate for every Maine town. Actual mil rates vary widely; a home in a low-mil-rate coastal town can have a meaningfully lower tax bill than the same-priced home in a higher-mil-rate inland municipality.
• Forgetting the Homestead Exemption when comparing an estimate to an actual tax bill. Owner-occupied residences that have held the exemption for the required period see $25,000 shaved off assessed value before the mil rate is applied, which this calculator's flat estimate does not replicate.
• Ignoring PMI on lower down payments, which adds real monthly cost not reflected in the base PITI figure whenever down payment falls below 20%.
• Underbudgeting for heating and utility costs, which in Maine can rival or exceed the insurance line item in the PITI estimate during winter months.
• Comparing this Maine estimate directly to a lower-property-tax state without adjusting the tax assumption, since Maine's effective rate sits well above the national median.

• Maine Revenue Services: Municipal mil rate data and statewide property tax statistics.
• Maine Homestead Exemption Program (36 M.R.S. § 683): Assessed value reduction rules for qualifying owner-occupied residences.
• Consumer Financial Protection Bureau: PITI and mortgage disclosure guidance under Regulation Z and RESPA.
• Tax Foundation: Comparative state and local effective property tax rate rankings.