A county reassessment notice rarely feels urgent when it arrives. Then a few months later, your mortgage payment jumps, and the connection isn't obvious unless you know how escrow works.
The chain reaction, step by step
Your county reassesses your home's value periodically (the schedule varies by state and county, from annually to once every several years). If the assessed value rises, and your local tax rate stays flat or also rises, your annual property tax bill increases. Because your servicer collects property tax through your escrow account, a higher tax bill means your servicer needs to collect more each month, which raises your total mortgage payment, even though your principal & interest never changed.
A fixed-rate mortgage locks your principal and interest, not your total payment. The escrow portion, taxes and insurance, is re-projected every year regardless of your rate, which is why a "fixed" payment can still rise.
A worked example
Say your home was assessed at $380,000 and your local effective tax rate is 1.2%, putting your annual bill at $4,560, or $380/month through escrow. If a reassessment raises your assessed value to $420,000 at the same rate, your new bill is $5,040/year, or $420/month. That is a $40/month payment increase, entirely from the tax line, with your rate and principal untouched.
"A 'fixed-rate' mortgage locks your principal and interest, not the escrow portion that funds your tax and insurance bills."
What you can actually do about it
- Appeal your assessment. Most counties allow an annual appeal, typically requiring recent comparable sales that don't support your new assessed value. Success rates are higher than most homeowners expect, and a successful appeal lowers both your tax bill and your escrow requirement.
- Check for exemptions. Homestead, senior, veteran, and disability exemptions can meaningfully reduce your taxable assessed value. Many homeowners never apply because they don't know they qualify.
- Confirm the timeline. A reassessment doesn't hit your payment immediately. It flows through at your next annual escrow analysis, so you may have a few months' notice before the new payment takes effect.
Model the payment impact yourself with our free escrow shortage calculator. Enter your new tax figure and see the monthly difference before your servicer's statement arrives.
Most homeowners find out about a tax increase from the mortgage payment change itself, months after the reassessment happened. CasaCrow tracks local tax trends and your escrow balance year-round, so you see it coming.
See a tax increase before your servicer's statement does
CasaCrow tracks local tax trends and your escrow balance year-round.
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