How US property tax changes your monthly mortgage payment — by state

When American buyers shop for a mortgage, almost everyone focuses on two numbers: the loan amount and the interest rate. But the payment that actually leaves your bank account each month is bigger than principal and interest — and the part most people underestimate is property tax. Depending on where you buy, it can add anywhere from $100 to $800+ a month to the exact same house.

PITI: the four parts of a US mortgage payment

Lenders think in terms of PITI — Principal, Interest, Taxes, and Insurance. Principal and interest are the loan itself. Taxes and insurance are the extras your lender collects on top and pays out on your behalf:

P & I — what repays the loan. Set by the loan amount, rate and term.
T — annual property tax, charged by your local county, city and school district.
I — homeowners insurance, plus PMI if your down payment is under 20%.

Two of those four — taxes and insurance — have nothing to do with your lender or your rate, and they're exactly the parts buyers forget when they eyeball "I can afford $2,000 a month."

How the escrow account works

Most US lenders don't trust borrowers to save up a once-a-year tax bill, so they collect it monthly. They divide your estimated annual property tax and insurance by twelve, add it to your principal-and-interest payment, and hold it in an escrow (impound) account. When the tax bill and insurance premium come due, the lender pays them from escrow.

That's why your "mortgage payment" is really a bundle. It also means that when your county reassesses your home or raises its rate, your monthly payment goes up — even though your loan and interest rate never changed.

"By state" is really "by county"

One important caveat: property tax in the US isn't set at the state level. It's levied locally — by counties, municipalities and school districts — so two homes in the same state can carry very different bills. When people talk about a state's property tax, they mean the average effective rate: total property tax paid divided by total home value across that state. It's a useful planning benchmark, but always check the actual rate for the specific county and city you're buying in.

The states where property tax hurts most — and least

The spread across the country is dramatic. As a rough guide to average effective rates:

Highest (roughly 1.9%–2.2%): New Jersey, Illinois, Connecticut, New Hampshire and Texas tend to sit at the top. Texas is the classic trade-off — no state income tax, but some of the highest property taxes in the country to make up for it.

Lowest (roughly 0.3%–0.6%): Hawaii is the lowest in the nation, followed by states like Alabama, Colorado, Nevada and Utah.

National average: somewhere around 1.0%–1.1% of home value per year.

Those percentages sound small until you put them against a real purchase price.

Worked example: the same $400,000 home in two states

Imagine an identical $400,000 home, same loan, same rate. Only the location changes:

New Jersey at ~2.2%: about $8,800 a year in property tax — roughly $733 a month added to your payment, before you've covered a cent of insurance.

Alabama at ~0.4%: about $1,600 a year — roughly $133 a month.

That's a $600-a-month difference on the same house, the same loan, the same rate — purely because of where it sits. Over a 30-year term, that gap is more than $200,000. Property tax isn't a rounding error; for many buyers it's the single biggest factor separating "affordable" from "stretched."

Common mistakes

Budgeting on principal and interest alone. A mortgage calculator that stops at P&I will flatter every high-tax state. Always add taxes and insurance before you decide what you can afford.

Assuming the rate won't change once you've locked. Your interest rate may be fixed, but your escrow isn't. Reassessments and rising insurance premiums push the monthly payment up over time.

Comparing list prices across states without comparing tax rates. A cheaper home in a high-tax county can cost more per month than a pricier home in a low-tax one. Compare the full PITI payment, not the sticker price.

Forgetting PMI under 20% down. Put down less than 20% and most conventional loans add private mortgage insurance on top of everything above — another line in the monthly bundle until you build enough equity.