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Union County Property Tax Appeal — Deadline and How to File

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The deadline

Filing deadline

September 1

per the Union County Board of Assessment Appeals' Tax Appeal Procedure Handbook, checked 2026-09-11 — source

Union County is reassessing every property for the 2028 tax year. Final notices of the new assessments are mailed in summer 2027, and a change of assessment appeal must be filed by 4:30 PM within 40 days of the date of the notice.

Who hears it, and where it goes

Your appeal is decided by the Union County Board of Assessment Appeals.

Where to file

Union County Assessment Office
103 South 2nd Street
Lewisburg, PA 17837

The form: Residential Assessment Appeal form.

per the Union County Assessment Office's Tax Appeal Procedure Handbook, checked 2026-09-11 — source

Nearby counties

More: the county index and the Pennsylvania guide.

What your assessed value means here

Pennsylvania — assessed at a base-year value; the STEB Common Level Ratio for your county is about 42.92% of current market. Confirm the ratio on your notice (53 Pa.C.S. §8854).

Union County's common level ratio is drawn from the 2025 CLR (2024 sales data; effective 7/1/2026–6/30/2027) table — the same figure the app uses to compare your assessment to current market value.

Can the board raise your assessment?

Yes. The Union County Board of Assessment Appeals can raise your assessment on your own appeal, not only lower it. That is the risk you take by filing, and it is why the case has to be worth making before you file it.

What a board actually weighs

The Union County Board of Assessment Appeals decides what your property was worth on the valuation date, so recent comparable sales carry the case, not the size of the bill. The Pennsylvania guide covers the evidence.

Common questions

When is the deadline to appeal my property assessment in Union County?
The deadline is September 1 — per the Union County Board of Assessment Appeals' Tax Appeal Procedure Handbook, checked 2026-09-11. Union County is reassessing every property for the 2028 tax year. Final notices of the new assessments are mailed in summer 2027, and a change of assessment appeal must be filed by 4:30 PM within 40 days of the date of the notice.
Who decides my appeal in Union County?
The Union County Board of Assessment Appeals.
Where do I send my appeal in Union County?
To the Union County Assessment Office, 103 South 2nd Street, Lewisburg, PA 17837 — per the Union County Assessment Office's Tax Appeal Procedure Handbook, checked 2026-09-11. The form is the Residential Assessment Appeal form.

Sources

Property tax rules and deadlines vary by jurisdiction and can change — verify with your county before relying on this.

PROppeal is coming soon for Union County

When it launches, PROppeal will check your case against real, recent comparable sales and give you an honest verdict — then build the board-ready letter to file — $29.99, no percentage of your savings.

Want a heads-up when it’s live? Email [email protected].