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Calculator Methodology

How the Tax Proration Calculator estimate works

Tax proration is timing math. Get the direction right before treating it as seller proceeds.

This estimate is for planning. Actual results may change based on local pricing, contracts, title practice, lender disclosures, insurance documents, inspection findings, hidden conditions, timing, and professional review.

Use the calculator Build decision packet

Inputs used

Defaults are planning placeholders, not recommendations.

Annual property taxes
Default: 8200 $
Seller-owned days this tax year
Default: 210 days
Local proration custom
Default: seller-credit
Escrow/timing buffer
Default: 350 $

What is included

  • The visible inputs listed on the calculator page.
  • The assumptions shown below the calculator.
  • A planning estimate based on the calculator family, not a binding quote, contract, appraisal, insurance settlement, title statement, or lender disclosure.
  • Input: Annual property taxes.
  • Input: Seller-owned days this tax year.
  • Input: Local proration custom.
  • Input: Escrow/timing buffer.

What is excluded

  • Final contractor pricing, local permit interpretation, lender underwriting, title-company settlement, insurance claim approval, tax advice, legal advice, or property-specific professional judgment.
  • Every local custom, contract term, hidden condition, inspection finding, market shift, and timing issue.
  • Guaranteed savings, resale value, coverage, approval, or final cash due.
  • Full title commitment review, purchase contract interpretation, settlement statement preparation, payoff quote, tax bill reconciliation, HOA resale package, or brokerage advice.

What can make the estimate too low

  • Title, tax proration, association fees, payoff timing, seller credits, concessions, prepaids, escrow setup, repair credits, or contract-specific terms are missing.
  • The estimate uses optimistic sale price, low fee assumptions, or stale payoff data.
  • Local custom shifts a cost to the side that did not budget for it.

What can make the estimate too high

  • Seller credits, lender credits, negotiated fees, lower concessions, lower association charges, or better payoff timing apply.
  • A title company or lender fee sheet replaces broad percentage assumptions.
  • A conservative scenario was used for planning but the final contract is cleaner.

Assumptions

  • Some places tax in arrears, some contracts prorate differently, and escrow/tax bills can change the final figure.
  • Confirm with the title company and contract.

When to verify before acting

  • Before signing a contractor quote, purchase contract, listing agreement, loan document, title document, insurance claim document, or association document.
  • When a result depends on local custom, contract language, code, warranty, hidden conditions, eligibility, or professional judgment.
  • When the result changes whether you repair, replace, sell, buy, claim, finance, or walk away.