Pennsylvania counties reassess on their own schedules, some every few years and some decades apart. A reassessment resets your assessed value toward current market, which can raise or lower your tax bill.
There Is No Single State Schedule
Pennsylvania does not reassess every property on a fixed statewide calendar. Each county runs its own assessment system and decides when to do a county-wide reassessment. Some counties reassess every few years, while others have gone decades between updates. That uneven schedule is exactly why two similar homes in different counties can carry wildly different tax bills.
When a county reassesses, it resets every property's assessed value to a target that is supposed to reflect current market value. Before the reassessment, your assessed value may have been a fraction of what the home is worth. After it, the assessment moves closer to market, and the county typically adjusts millage rates so the total tax collected does not jump all at once.
What a Reassessment Means for Your Bill
A reassessment does not automatically mean higher taxes. Counties usually lower millage rates when they reassess, so the total bill for the average home stays roughly the same. But if your home has appreciated more than the average home in your county, your share can go up, and if it has appreciated less, your share can go down.
This is why homeowners sometimes see a confusing result: their assessed value jumps, yet their bill barely changes, or it rises even though the rate fell. The reassessment is really about redistributing the tax burden among properties based on current values, not about raising the county's total take.
How to Find Out If a Reassessment Is Coming
Reassessments are public processes, but they are announced well in advance. Your county's assessment office publishes reassessment schedules, and most counties hold public notices and hearings before a county-wide update. If you are considering a home in a county that is due for a reassessment, ask your agent and the county office about the timeline.
Buying right before a reassessment carries some risk, because your assessed value could be reset closer to the price you just paid. That is not always bad, the millage may adjust too, but it is worth knowing before you commit so a post-purchase tax jump does not catch you off guard.
Appeals Only Happen in a Window
If a reassessment produces a value you disagree with, you can appeal, but only within a limited window. Each county has a deadline for filing an assessment appeal, usually tied to the annual assessment roll or the reassessment notice. Miss the deadline and you generally have to wait until the next appeal period.
An appeal is not about arguing that taxes are too high in general. It is about showing that your specific assessed value is wrong, for example, because the county mis-measured the home, used incorrect data, or valued it out of line with comparable properties. A real estate attorney or a local tax professional who handles assessment appeals can guide you through the process in your county.
What This Means for Buyers
For buyers, the reassessment schedule is part of due diligence. Ask whether the county has recently reassessed and whether another update is planned, then factor the likely change into your budget. A home in a county that has not reassessed in years may be carrying a low assessment that is due to jump, and a home in a freshly reassessed county may already reflect current values.
Your agent can pull the property's current assessment and bill, and the county can tell you the reassessment timeline. Knowing both gives you a realistic picture of what your taxes will look like in your second and third year of ownership, not just the first.
Smarty's Advice
I have seen buyers fall in love with a low tax bill that was about to reset to market. Before you offer, ask two questions: when did this county last reassess, and is another one scheduled? The answer changes how much you should budget for year two.
If a reassessment is coming, run your numbers at the projected post-reassessment value, not just today's bill. And if you get a reassessment notice you think is wrong, file the appeal before the deadline, because the window closes fast.
Call 215-598-6848 or schedule a free consultation, and I will help you evaluate the tax outlook for any home across the six counties I serve.
Smarty's Advice Expert Insight
John Smart (Smarty) · Smarty Home Solutions / eXp Realty Agent, AI Certified Agent
A reassessment changes the math for both sides of a sale. For a seller, a reassessment can raise the assessed value before you list, which is a selling point if your taxes are now higher than the town average, or a drag if your bill is about to jump. For a buyer, the timing of a reassessment relative to your purchase decides whether your first full year of taxes looks like the number on the listing or something higher.
If a county reassesses shortly after you buy, your assessed value is often reset toward the price you just paid, because the sale itself is evidence of market value. That can mean your bill rises to match the purchase price, even if the previous owner benefited from a low, stale assessment. The millage is usually adjusted to soften the blow, but the redistribution can still move your share up.
This is one reason I encourage buyers to ask about the reassessment history of both the county and the specific property. A home that has not been reassessed in a decade may look like a bargain on taxes today, but those taxes are the most likely to jump after you buy. Pricing that possibility into your budget is the difference between a comfortable purchase and a surprise in year two.