NookLocal data
Chester County Common Level Ratio
The 2025 Common Level Ratio for Chester County is 30.6%, and the CLR factor is 3.27. The State Tax Equalization Board certified it for use from 2026-07-01 to 2027-06-30. Assessments in Chester County average 30.6% of market value, the 31st lowest ratio of Pennsylvania's 67 counties.
| County | CLR (assessed ÷ market) | CLR factor | In effect |
|---|---|---|---|
| Chester | 30.6% | 3.27 | 2026-07-01 to 2027-06-30 |
What the ratio means in Chester County
Multiply a price by the ratio and you get what a home's assessment "should" be at typical Chester County ratios: a $400,000 home works out to an assessment around $122,320. If the actual assessment sits far below that, a sale can invite a school-district assessment appeal that raises the bill; far above, and the owner may be over-paying and have a case to appeal down.
The factor runs the same math in reverse. Multiply an assessed value by 3.27 to estimate market value: a $150,000 assessment in Chester County suggests a market value around $490,500. The factor is also what the state uses to compute realty transfer tax on non-arm's-length transfers, where the price on the deed doesn't reflect an arm's-length market value.
See the full 67-county CLR table to compare counties, the Chester County property tax guide for millage rates, or the property tax calculator, which uses these ratios for purchase estimates.
Chester County CLR questions
What is the Common Level Ratio in Chester County?
The 2025 STEB-certified Common Level Ratio for Chester County is 30.6%, and the CLR factor is 3.27. It applies from 2026-07-01 to 2027-06-30.
How do I estimate market value from an assessment?
Multiply the assessed value by the CLR factor. In Chester County, a $150,000 assessment times 3.27 suggests a market value around $490,500.
When does the CLR change?
STEB certifies a new ratio for every county each year, and it takes effect on July 1. The current Chester County ratio applies 2026-07-01 to 2027-06-30.
Where is the CLR used?
Two main places: assessment appeals, where the ratio converts a market value into what the assessment should be, and realty transfer tax on non-arm's-length transfers, where the factor converts an assessed value into a taxable value.
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Source: PA Department of Community & Economic Development, State Tax Equalization Board. Last verified 2026-07-04. Ratios change every July. This page tracks the current Chester County ratio.