That letter from your mortgage servicer is never fun to open.
One month your payment is $1,840, and the next it's $2,190.
In most cases, the culprit is an escrow shortage — and millions of homeowners get hit with one every year without warning.
Escrow is the account your servicer uses to pay your property taxes and homeowners insurance on your behalf.
You pay into it monthly as part of your mortgage.
The problem is that the servicer is guessing.
It estimates next year's tax bill and insurance premium, divides that by 12, and tacks it onto your payment.
When those guesses come in low, you owe the difference — and the servicer wants it back.
The biggest driver right now is property taxes.
Home values jumped sharply in many markets over the past few years, and county assessors have been catching up.
If your home was reassessed upward, your tax bill could climb 10%, 20%, or more in a single year.
Your servicer had no way to predict that when it set your payment twelve months earlier.
Insurance is the other half of the squeeze.
Homeowners premiums have been climbing fast, especially in states dealing with wildfire, hurricane, and hail damage.
In places like Florida, Louisiana, and parts of California and Texas, premiums have doubled in a few years.
Your escrow analysis from last year simply didn't account for it.
If your servicer paid your tax bill late and ate a penalty, that penalty lands in your escrow account.
If you bought a new build, the first year's tax bill was likely based on raw land value — the following year it gets reassessed with a house on it.
Same story if you dropped PMI or refinanced and the servicer reset your escrow cushion.
Here's the part that stings: you don't just repay the shortfall.
Federal rules let servicers keep a cushion of up to two months of escrow payments on hand.
So your new monthly payment often includes the shortage spread over 12 months plus a higher base escrow payment to rebuild that cushion.
That's why the increase feels so much bigger than the actual gap.
First, read the escrow analysis statement carefully — servicers are required to send one annually.
Check the projected tax and insurance figures against your actual bills.
Errors happen more often than you'd think, and disputing a wrong number is free.
Second, call and ask about spreading the shortage over a longer period.
Twelve months is standard, but many servicers will stretch it to 24 if you ask.
Third, shop your homeowners insurance at renewal.
Bundling auto and home, raising your deductible, or switching carriers can shave hundreds off the premium that feeds your escrow.
Fourth, if you have the cash, paying the shortage in a lump sum resets your payment immediately instead of over a year.
Finally, check whether your county offers a homestead exemption or assessment cap you're not using.
In states like Texas and Florida, these can meaningfully limit how fast your taxable value rises.
Your county appraisal district's website usually explains how to apply, and it's typically free.
The uncomfortable truth is that escrow shortages are becoming a routine part of homeownership, not a rare glitch.
Between rising assessments and insurance markets in turmoil, servicers are guessing at numbers that keep moving.
Final Thoughts
Budget for a possible increase each year, keep a small cushion in savings, and open that servicer letter the day it arrives — because the deadline to respond is often shorter than you'd expect.