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Property-tax change calculator

See how an annual property-tax change may translate into a monthly escrow change before any separate shortage repayment.

Page updated August 14, 2026 · Educational information

Tax impact

Property-tax payment change

Estimated monthly escrow change

+$100.00/month

Previous monthly
$500.00
Projected monthly
$600.00
Annual change
+$1,200.00

This converts the annual difference to a monthly amount. It does not determine whether an assessment is correct, whether you qualify for an exemption, or how a local appeal process works.

Why taxes can change the mortgage payment

A servicer generally collects one-twelfth of reasonably anticipated annual escrow disbursements each month. When the projected property-tax bill changes, the base monthly escrow amount changes with it.

What to verify locally

  • The parcel and property description
  • Assessed value and applicable tax rate
  • Homestead, senior, veteran, disability, or other exemptions
  • Whether the bill covers land only, partial construction, or the completed home
  • Appeal rights, evidence requirements, and filing deadline

If the increase comes from a higher assessment, use the private property-tax assessment review to compare official values, exemptions, property facts, valuation evidence, and comparable assessments.

New-construction warning

An early tax bill can be based on vacant land or an incomplete improvement. A later assessment may reflect the finished home, increasing both the ongoing escrow need and the chance of a shortage. Use the completed-home estimate when planning, if the local tax authority provides one.

After a correction or successful appeal

Ask the servicer what final documentation it requires and whether it can perform a new analysis. A reduced assessment does not always appear in the mortgage payment immediately.

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