Allegheny County property tax due dates

When property taxes are due in Allegheny County, PA — plus the official payment portal and what happens if you're late.

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…until discounted payment (2%) — March 31, 2027

Instalment	Due date	Notes
Discounted payment (2%)	March 31, 2027	Pay by this date to save 2%
Face amount	April 30, 2027	Full amount, no discount

Pay on the county site →

Source: www.alleghenycounty.us · verified October 17, 2026

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If you pay late

Penalty and extra fees apply starting May 1.

Single annual bill with a discount period. If a due date lands on a weekend or public holiday, most counties move it to the next business day — check the county's own notice before relying on the shift.

How to pay

Online: through www.alleghenycounty.us — the only portal this county operates.
By post: mail a cheque to the treasurer's office; the postmark date usually counts, not the arrival date.
In person: the treasurer's office during business hours; bring your bill or parcel number.
Mortgage escrow: if your taxes are escrowed, the servicer pays — you still owe the difference if your escrow is short.

Common questions

When are property taxes due in Allegheny County, PA?

Discounted payment (2%): March 31, 2027. Face amount: April 30, 2027.

What happens if I pay late in Allegheny County?

Penalty and extra fees apply starting May 1.

How do I pay Allegheny County property tax?

Pay online through www.alleghenycounty.us, the county's own payment portal, or by post or in person at the treasurer's office.

Is the Allegheny County deadline the same every year?

Single annual bill with a discount period. Counties shift dates when billing is delayed, so confirm against the county source linked on this page.

What if I can't pay in full?

Most counties offer instalment plans or partial payment — ask the treasurer before the due date, not after. Once the bill is delinquent the options shrink and the fees start.

Does a late payment affect my mortgage?

Unpaid property tax is a lien on the property in most states, which your servicer may pay and then bill you for, with fees. It does not disappear.

Other PA counties

Philadelphia County Next: Mar 31, 2027

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StacyApproved is an independent reference and is not a government agency. Deadlines change and exceptions apply — always confirm with your county treasurer using the official link on this page. Nothing here is tax, legal or financial advice.