Buyer Guide
How Do Property Taxes Work in Lehigh vs. Northampton County?
CT
Chris Troxell Team
If you are browsing Lehigh Valley homes for sale, you have likely noticed that two identical houses can have wildly different tax bills. In Pennsylvania, property taxes are not a single flat fee. They are a "Triple Tax" composed of County, Municipal, and School District Levies.
As we navigate the 2026 market, understanding the exact differences between Lehigh and Northampton counties is essential for calculating your true long-term carrying costs.
The biggest point of confusion for buyers is that tax bills are not based on your purchase price. They are based on an assessed value set by the county.
Uses a base year of 2012. This means your "assessed value" on paper will look significantly lower than today's actual market value.
Has maintained a remarkably stable tax environment, passing its 2026 budget with no tax increase for the eighth consecutive year. Their county millage rate remains fixed at 10.8 mills.
A unique challenge in our region is the City of Bethlehem, which physically sits in both counties. In 2026, the millage rates for the City portion of the bill are drastically different to account for the varying county assessment ratios.
City millage rate for Bethlehem residents on the Lehigh County side
City millage rate for Bethlehem residents on the Northampton County side
While the upfront numbers look completely different, the actual dollar amount often balances out because of how each county assesses the baseline property value.
In both counties, the School District tax typically makes up 70 to 80 percent of your total bill. For the 2025 to 2026 fiscal year, districts like Allentown and Bethlehem Area have specific rates that buyers must factor directly into their monthly mortgage planning.
Remains a primary driver of the tax bill for city residents
of total tax bill
To estimate your taxes, you use a millage rate (one mill equals $1 for every $1,000 of assessed value).
(Assessed Value x Total Millage) / 1,000 = Annual Tax
If a home in Northampton County is assessed at $100,000 and the total combined millage (County + City + School) is 85 mills, your annual tax would be:
($100,000 x 85) / 1,000 = $8,500
Annual Property Tax
In many Lehigh Valley municipalities, paying your bill in full by March 31st earns you a 2 percent discount.
Payments made by May 29th are at the standard "face" value.
Any payments made after spring deadlines typically incur a 10 percent penalty.
Taxes in the Lehigh Valley are hyper-local. A house on one side of a street in Salisbury Township might pay thousands less than a house across the street in Allentown, even if they share a backyard.
Before you make an offer, the Chris Troxell Team provides a full Tax Liability Lookup to ensure you know exactly what your "all-in" monthly payment will be.
Request Your Tax LookupProperty taxes are just one piece of the puzzle. Let us walk you through the complete financial picture before you buy in the Lehigh Valley.