Property Taxes: The Complete Guide

Property tax is the silent third of your mortgage payment — the part that is easy to forget when you are looking at listings and impossible to ignore once the bills arrive. It varies more than any other housing cost in America, from 0.28% of home value in Hawaii to 2.47% in New Jersey. On a $400,000 home, that is the difference between $93 a month and $823 a month — nearly $9,000 a year — for the exact same house in a different state. Understanding how property tax works, which states charge the most, and how it flows through your monthly payment is essential before you buy.

How property tax is calculated

Property tax is a local tax, set by your county, city, school district and other local bodies, not by the federal government. The system works like this: your local taxing authorities set a budget, your home is assigned an assessed value, and a tax rate — often expressed in mills, where one mill is $1 of tax per $1,000 of assessed value — is applied to that value to produce your annual bill.

The number that matters for comparing places is the effective tax rate: your annual tax divided by your home's market value. This is what lets you compare a home in New Jersey against one in Texas on a level field, because it accounts for differences in both tax rates and how homes are assessed.

There is also a crucial distinction between assessed value and market value. Assessors may value homes at a fraction of market value, or reassess only every few years, which is why the "mill rate" alone does not tell you the whole story. The effective rate — what you actually pay as a share of value — is the number to track.

The most expensive states

Tax burden is not just about the rate; it is the rate applied to real home prices. These states cost homeowners the most in absolute dollars.

New Jersey leads the nation with the highest effective rate, and combined with high home prices it produces some of the largest tax bills in the country. Texas has no state income tax, but it makes up for it with property tax — a reminder that every state funds services somehow, and the bill just shows up in a different place.

The most affordable states

These states have the lowest effective rates. Note that a low rate does not always mean a low bill — Hawaii has the lowest rate but also the highest prices, so its actual tax bills are still substantial.

The pattern to notice: the total tax bill is a product of rate and price. Alabama is cheap on both counts, so its bills are tiny. Hawaii is cheap on rate but expensive on price. Colorado sits in the middle. When you compare states, compare the actual dollar amount for the home you would buy, not just the headline rate.

Why tax goes into escrow

Most lenders require an escrow account for property tax and insurance. Here is how it works: instead of receiving one large tax bill each year and one insurance bill, you pay a slice of both every month as part of your mortgage payment. The lender holds that money in an escrow account and pays the county and the insurer when the bills come due.

Escrow exists primarily to protect the lender. Property tax liens take priority over mortgages in most states, meaning if you do not pay your taxes, the county can force a sale and the lender can lose its collateral. By collecting the tax monthly and paying it for you, the lender guarantees the tax is always paid on time. The side benefit for you is that it smooths a large annual bill into a predictable monthly payment, so you never face a surprise lump sum.

One quirk to know: lenders often require a "cushion" in escrow of up to two months of tax and insurance, held as a buffer. When your tax or insurance rises, the lender recalculates your escrow, and you either pay more each month or a one-time catch-up amount. This is why your total mortgage payment can rise even on a fixed-rate loan.

Watch for the reassessment after you buy

This is the property tax surprise that catches new buyers off guard. When a home is sold, the assessed value often resets to the sale price — especially in states that reassess on transfer. A home that was assessed low for years because the previous owner bought it long ago and benefited from assessment caps can jump dramatically in tax the year after you move in.

The practical lesson: budget for the property tax on what you actually paid, not on what the previous owner paid. If you check the listing and see the current owner's tax bill, that number may reflect an old, capped assessment that will not apply to you. The new bill is based on your purchase price and your local rate. A quick check of the county's current effective rate against your purchase price gives you the real number before you commit.

Frequently asked questions

Which state has the highest property tax?

New Jersey, with an effective rate around 2.47%. Illinois and Texas are also among the highest. Hawaii has the lowest rate at about 0.28%.

Is property tax included in my mortgage payment?

Usually, yes. Most lenders escrow your property tax and insurance and pay them for you, so they are included in your monthly payment. Some buyers choose to pay tax directly, but lenders often charge for that privilege.

Why did my mortgage payment go up on a fixed-rate loan?

Your principal and interest are fixed, but the escrow portion adjusts when property tax or insurance rises. That is why total payments can climb over time.

Can I lower my property tax?

Yes, by appealing the assessment if you believe your home is overvalued, or by claiming exemptions like the homestead exemption where available. Success rates vary by county.

See your state's real numbers

Every state and city page on our site pre-fills the local property tax rate, so your payment estimate reflects reality, not a national guess. Browse our state and city calculators to see exactly how much property tax adds to a mortgage in the place you are considering — it is often the difference between a payment that fits and one that does not.