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On a typical Boston mortgage — $584,911 at 20% down — extra payments can dramatically shorten your loan term and save tens of thousands in interest. Property taxes in Boston run $7,750/year, so understanding your full payment picture is essential. In high-cost cities like Boston (COL: 162), paying down principal faster builds equity in an appreciating market.
✓ Calculator below is pre-filled with Boston local data
Data as of · Sources: Zillow, Census ACS, Tax Foundation, Freddie Mac
Loading Extra Mortgage Payment Calculator for Boston…
Home value, monthly carrying cost, property tax, and insurance are the four levers for the extra mortgage payment calculator in Massachusetts. Every row cites a primary public dataset. Numbers reflect the most recent vintage available; refresh cadence is documented in the methodology.
Every real-estate number on this page runs through the same core identity: the monthly principal-and-interest payment on a fully amortizing fixed-rate loan is M = P · r / (1 − (1+r)^(−n)), where P is the loan principal, r is the monthly rate (annual rate / 12), and n is the term in months. For a typical Massachusetts buyer in 2026, P starts from an $620,000 median home value (Zillow ZHVI)[1], minus a standard 20% down payment.
On top of P&I the calculator adds the two Massachusetts-specific carrying costs: property tax at the state effective rate of 1.14%[2] and homeowners insurance at roughly $1,830/year (NAIC state average)[3]. The Freddie Mac PMMS national average 30-year fixed rate (6.30% (Freddie Mac PMMS · week of ))[4] drives the payment curve — Massachusetts rate quotes can move a few basis points around that number depending on lender, loan size, and credit band.
Housing economics in Boston, MA. The median home value runs 104.2% above the U.S. baseline for Boston, MA is $731,139 per Zillow's home-value index. Median rent runs $3,148 a month per Zillow ZORI, a premium over the national $1,850 baseline. Effective property tax sits at 1.06% of assessed value, meaningfully higher than the 0.99% national average tracked by the Tax Foundation. Lenders in Boston, MA have quoted 6.30% on the 30-year fixed product over the trailing four-week window per Freddie Mac PMMS — the prevailing posted rate before any borrower-specific lock-ins.
Income and tax climate. Massachusetts's top marginal state income tax bracket lands at 5.00% — compared to the volume-weighted national average around 4-5%. BEA's Regional Price Parity scores Boston, MA at 162.0 (national = 100), meaning a dollar in Boston, MA buys 62¢ of national purchasing power.
How Boston, MA's numbers shape the calculator. The mortgage payment, refinance, PMI, and home-affordability calculators all run on three local inputs that swing the answer materially: the prevailing 30-year fixed rate, the effective property tax rate as a share of home value, and the homeowners-insurance premium that the average policyholder is paying for the same coverage envelope. Boston, MA-specific values for each of those are pre-loaded above so the calculator's default scenario reflects what an actual buyer would see at closing, not a national average that smooths over the differences. Override any field to test a different scenario; the math reruns instantly in your browser without sending the inputs anywhere.
Local context as of 2026-05-28. Live data sources are listed in the Sources section below; each metric carries its own retrieval date.
How does Boston, MA stack up against the national average on the metrics that drive the calculators on this page? The table below pairs the Boston, MA-specific reading against the U.S. baseline so you can see at a glance whether your local scenario runs above or below typical. Three to five percentage points of difference on most of these inputs translates into meaningful changes in calculator output — for example, a 50-basis-point difference in mortgage rate moves the monthly payment on a $400,000 30-year loan by roughly $130.
| Metric | Boston, MA | U.S. baseline | Difference |
|---|---|---|---|
| Median home value[zillow] | $731,139 | $358,000 | 104.2% |
| Median monthly rent[zillow] | $3,148 | $1,850 | 70.2% |
| Property tax (effective)[tax-foundation] | 1.06% | 0.99% | 7.1% |
| State top marginal income tax[tax-foundation] | 5.00% | ~4.08% (volume-weighted) | 0.9 pp |
| State cost-of-living index[bea-rpp] | 162.0 | 100.0 | 62.0 pts |
Walk through using the Extra Mortgage Payment Calculator with Boston, MA-specific defaults pre-loaded from primary sources.
Moving one state over changes the extra mortgage payment numbers. Compare median home value (Zillow ZHVI), top marginal income tax rate, effective property tax rate, and the BEA all-items Regional Price Parity across Massachusetts and its border states.
| State | Median home | Top inc tax | Prop tax rate | RPP (US=100) |
|---|---|---|---|---|
| Massachusetts (this page) | $620,000 | 9.00% | 1.14% | 107.7 |
| Connecticut side-by-side | $395,000 | 6.99% | 1.96% | 104.2 |
| check New Hampshire | $475,000 | None | 1.93% | 105.4 |
| check New York | $470,000 | 10.90% | 1.72% | 107.8 |
| see Rhode Island | $440,000 | 5.99% | 1.53% | 102.1 |
Sources: Zillow ZHVI[1], state Departments of Revenue / Tax Foundation[2], Tax Foundation property taxes[3], BEA Regional Price Parities[4].
These calculators share inputs with the extra mortgage payment formula, so pair them to pressure-test your answer from multiple angles.
Understanding how Boston stacks up helps you calibrate your financial planning.
| Metric | Boston, MA | US Average | Difference |
|---|---|---|---|
| Median Home Price | $731,139 | $420,800 | +73.7% |
| Median Monthly Rent | $3,148 | $1,713 | +83.8% |
| Median Household Income | $112,484 | $74,580 | +50.8% |
| Property Tax Rate | 1.06% | 1.10% | -3.6% |
| Cost of Living Index | 162 | 100 | +62.0% |
Sources: U.S. Census Bureau, BLS, Zillow, NAR (2024–2025). Green = favorable for residents; red = less favorable.
The median home price in Boston is $731,139 as of 2025–2026. This is above the national median of $420,800.
Median monthly rent in Boston is $3,148. That works out to $37,776/year, or 34% of the median household income — above the recommended 30% threshold.
Boston's cost of living index is 162 vs. the national average of 100. With a median household income of $112,484/year and a median home price of $731,139, the price-to-income ratio is 6.5x. This makes homeownership a significant stretch for the typical Boston household.
The effective property tax rate in Boston is 1.06% of assessed value. On the median home of $731,139, that's roughly $7,750/year ($646/month).
Massachusetts median home price of $585,000 is 39% above the national average — driven by Greater Boston demand.
MassHousing offers down payment assistance up to $50,000 in high-cost areas (ONE Mortgage Program).
Massachusetts' property tax rate of 1.23% is moderate, but high home values mean large absolute tax bills.
Massachusetts has a "super lien" for condo associations — unpaid condo fees take priority over first mortgages for up to 6 months of arrears.
Statewide Massachusetts figures apply broadly across Boston. County- and city-level variation can be significant — verify against local sources before closing a transaction. [3]
The Boston page uses local median home price ($731,139), median rent ($3,148/mo), and property tax rate (1.06%) alongside the calculator's client-side formula. Calculations run in your browser — no inputs are sent to a server.
Refresh cadence:home price (Zillow ZHVI) and rent (Zillow ZORI) are reviewed monthly when the source publishes. Property tax and cost-of-living figures refresh annually. The page's dateModified reflects the most recent retrievedAt across every sourced value rendered above.
Known limits: ZIP-level variance within Boston can be substantial — the figures shown are city-wide medians. For a precise property tax quote, consult your county assessor.
src/data/state-financial-context.ts.Spot an error? Email hello@calcfi.app with the URL and the correct figure.