King of Prussia, PA Property Taxes & Tax Break Programs

How the millage works

Combined 2025 Montgomery County + Upper Merion Township + UMASD millage per the county Board of Assessment. You pay three separate bills: county (Montgomery), municipal (Upper Merion Township), and school district (Upper Merion Area School District). School district millage is usually the largest of the three.

Applicable tax breaks for this town

1. PA Homestead / Farmstead Exclusion (Act 50) 2. PA Property Tax/Rent Rebate Program (age 65+ / disabled) 3. Upper Merion senior discount programs 4. PA Clean & Green Act 319 (open-space assessed lower)

How to apply

Homestead / Farmstead Exclusion: file once with the Montgomery County Board of Assessment (deadline March 1). PA Property Tax/Rent Rebate: file annually with the PA Department of Revenue (Form PA-1000). LERTA / KOZ programs: coordinate with the municipality's economic development office before closing on a rehab or new-construction property.

• Montgomery County Assessment
• PA Property Tax/Rent Rebate Program
• PA Act 50 Homestead Exclusion
• Upper Merion Township Township

Estimating your bill

To estimate: multiply the parcel's assessed value (not market value) by the combined millage per $1,000. In Montgomery County, assessments are usually a fraction of market value — the "Common Level Ratio" (CLR) published annually by the PA State Tax Equalization Board reconciles the two.

• PA STEB Common Level Ratios