Pennsylvania property taxes, and what they do to your payment
Two houses at the same price, a block apart, can carry tax bills more than a thousand dollars a year apart. The tax rate you look up will not tell you that, and neither will comparing one county to the next.
Across the street
Take a single zip code outside Philadelphia. It covers three separate boroughs, and all three sit in the same school district. At a $365,000 purchase price, here is what the property tax line looks like in each one.
| Borough | Monthly property tax |
|---|---|
| Lansdowne | about $1,360 |
| Yeadon | about $1,470 |
| East Lansdowne | about $1,485 |
Same zip code, same school district, same price. Rates as published for 2026.
About $125 a month separates the first row from the last. Same house, same schools, different side of a boundary line.
Put that in rate terms. On a loan of roughly $347,000 at 6.625%, wiping out $125 of monthly cost would take an interest rate more than half a percent lower. Not an eighth, not a quarter — more than half a point.
Rate is worth shopping hard, and it is the number that gets shopped. The tax line here is the larger of the two, and it is settled before the rate conversation ever starts — by which side of a boundary the house happens to sit on. The listing will not tell you which side that is. All three boroughs share one zip code and one post office, so the address looks the same either way.
You are paying three separate bills
A Pennsylvania property tax bill is not one tax. It is three, levied by three different bodies:
- The county
- The municipality — your borough, city or township
- The school district
Each sets its own rate. They often bill on different calendars, which is why an escrow account can look strange in the first year — it has to fund all three, and they do not arrive together.
In the example above, the school district is roughly three-quarters of the entire bill. And it is identical across all three boroughs, because all three are in the same district. So the piece that creates the whole $125 spread is the municipal rate — the smallest of the three.
Why this catches people. The school district is what most buyers are actually shopping for, and it is the largest line on the bill. But within a district, the municipality still moves the number by real money. You can pick the schools you want and still land on the expensive side of a line you did not know was there.
A mill in Butler is not a mill in Allegheny
This is where comparing counties goes wrong, and it goes wrong in a way that is easy to miss.
Your tax bill is the rate multiplied by the assessed value — and assessed value is not what you paid. It is what the county says the property is worth, based on a valuation that in some counties is decades old. Counties are wildly inconsistent about this, so the rate alone tells you almost nothing.
Pennsylvania publishes a ratio for each county that translates between assessed value and market value. Run the same $400,000 house through three of them:
| County | Roughly what it would be assessed at |
|---|---|
| Butler | about $24,000 |
| Allegheny | about $197,000 |
| Delaware | about $219,000 |
Based on the state-published ratios in effect for 2026 to 2027. The same sale price, three counties.
Allegheny assesses that house at roughly eight times what Butler does. Which means Butler’s tax rate has to run about eight times higher to collect the same dollars. Comparing the two rates side by side produces a number that means nothing at all.
Butler County sits directly north of Allegheny County, and Pittsburgh’s northern suburbs run right across the line between them. So this is not an abstract comparison between distant places — it is a choice buyers in one metro area make regularly, usually for the schools, and usually with a price difference attached. That trade is worth pricing. It just cannot be priced by comparing tax rates.
One community, two counties
Treesdale, the golf course community north of Pittsburgh, sits on both sides of that county line. Homes on the Pine Township side are in Allegheny County and the Pine-Richland School District. Homes on the Adams Township side are in Butler County and the Mars Area School District.
One development. One entrance. One golf course. Two counties, two school districts, and two assessment systems that have nothing to do with each other. A buyer comparing two houses inside that community is comparing tax figures that are not built the same way — and the listings look like they are in the same place, because they are.
One more wrinkle. The rate a county publishes for a municipality is not always the rate that lands on the bill. The City of Pittsburgh is the example: the county list shows the general city levy, and the actual city bill adds a parks tax and a library tax on top of it. Small per mill, real in an escrow account, and it tends to turn up as a shortage in year two rather than at closing.
The assessment is an opinion, and it can move both ways
Because the assessment is the county’s estimate rather than your purchase price, the two can drift a long way apart — especially in a county that has not revalued in years.
That state ratio gives you a way to check where you stand. Divide the assessment by the ratio and you get the market value the county is implicitly claiming. Compare that to what you actually paid.
| If the implied value is… | It means | And |
|---|---|---|
| Below what you paid | You are assessed low | The school district may move to have it raised |
| Above what you paid | You are assessed high | You may have grounds to have it lowered |
Both directions happen, and the second one is worth a look, because it puts money back rather than taking it out. A buyer purchasing in a county whose valuations have fallen behind the market can find their new house assessed well above where the ratio says it should sit — and that is an appealable position, not a fixed cost.
An appeal is not the only lever, either. Pennsylvania has a homestead exclusion for your primary residence — a one-time application filed with the county, generally due March 1, that comes off the assessed value before the tax rate is applied. It is straightforward to file and easy to forget in the months after a closing. We walk through it in homestead exemptions after you buy.
A common half-answer. You will often hear that buying a house in Pennsylvania does not trigger a reassessment. That is broadly true — a sale by itself does not cause the county to revalue your property. But it does not follow that the number is frozen. Assessments can be challenged after a sale, by the owner and by the taxing bodies. Treat the figure on the listing as a starting point rather than a settled cost.
What this does to the loan, not just the payment
The tax line is not only a monthly number. It moves three things inside the file:
Your debt-to-income ratio
Taxes are part of the housing payment the underwriter measures when working out your debt-to-income ratio. In a high-tax municipality the tax line can be a third of the total payment, which means it is often the thing an approval actually turns on — not the rate. It bites hardest on a 2–4 unit purchase, where the payment is larger to begin with.
Your cash to close
Where reserves are required, they are counted in months of the full housing payment. A high tax line raises your monthly cost and then raises the reserve requirement built on top of it. It costs you twice.
How far seller help goes
If you are asking the seller to contribute toward closing costs, the escrow deposit counts against what they are allowed to give. A heavy tax bill means a large escrow deposit, which eats into that allowance before it reaches anything else. Our escrow and proration calculator will show you the deposit for a specific municipality.
Before you write the offer
- Find the municipality, not the mailing address. A zip code can cover several boroughs, and the post office boundary is not the tax boundary.
- Pull all three rates separately — county, municipality, school district. While you are there, check the transfer tax for that municipality, which is a separate local charge and also varies by town.
- Work from the assessment, not the price, then check it against the county ratio to see which way you are leaning.
I generally recommend checking the municipality before you shop the rate. The tax line is the larger number, and it is fixed the moment you choose the house.
General information about mortgage financing and Pennsylvania property taxation, not legal or tax advice. Millage rates and state-published assessment ratios change annually — figures reflect rates published for 2026 and ratios effective July 2026, and change without notice. Confirm the rate and assessment for a specific parcel with the county and municipality before relying on it. Forest Hills Mortgage LLC, NMLS #1982611. Matt Mergo, NMLS #563819. Licensed in Florida, Pennsylvania and Texas. Equal Housing Opportunity.
Not sure what the tax line looks like on a specific house?
Send me the address before you write the offer. I will run the actual municipality, school district and assessment, and show you what the real monthly payment comes to. It takes a few minutes, and it is a lot cheaper than finding out at the Loan Estimate.