Tax

Property Tax Proration Calculator

Estimate a buyer/seller tax adjustment for the closing date. Replace every default with figures that apply to your property and location.

What this calculator estimates

Estimate a buyer/seller tax adjustment for the closing date. It combines the inputs below to produce Estimated credit to seller. Every assumption remains editable so the estimate can reflect the property, financing and location being evaluated.

Worked example

Using the displayed sample assumptions, the calculator produces $2,622. This is an illustration, not a market quote. Change one input at a time to understand what drives the result.

Inputs and assumptions

• Annual property tax — sample input: 6600 currency units
• Days seller owns property in tax year — sample input: 220 days
• Tax already paid by seller — sample input: 6600 currency units
• Days in tax year — sample input: 365 days

How to interpret the result

Use the estimate for planning and confirm current jurisdiction rules. Compare a conservative case with an expected case and keep a record of the assumptions used.

Common mistake to avoid

Do not treat an estimated effective rate as a filed tax calculation. Local definitions, taxes, lending practices and measurement requirements can materially change the result.

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Reviewed 2026-09-08.