That letter from your mortgage servicer is not a scam, even though it looks like one.
It usually arrives in February or March, right after your annual escrow analysis, and it says you owe anywhere from a few hundred to several thousand dollars.
The cause is almost never mysterious, but it is almost always annoying.
Escrow is the account your lender uses to collect and pay your property taxes and homeowners insurance.
Your monthly payment includes an escrow portion, and the servicer is only allowed to collect what it expects you to owe.
When the estimate misses, you cover the difference—plus a cushion the lender builds in to avoid repeating the mistake. **Your property tax bill went up.** This is the single biggest driver.
Counties reassess on their own schedules, and many homeowners got a double hit: assessments rose sharply during the 2021–2022 buying frenzy, then tax rates followed.
If your home's assessed value jumped 15% but your servicer was still collecting based on the old number, you owe the gap in one lump. **Your insurance premium climbed.** Home insurance rates have been rising fast in states like Florida, Texas, Louisiana, and California, where insurers have pulled back or raised prices after heavy storm losses.
A premium that went from $1,800 to $3,200 creates a shortage all by itself.
Lenders often pay the new bill first and bill you later, which is why the shortage feels sudden. **The servicer guessed wrong last year.** Escrow analysis is a projection, not a fact.
If the company underestimated your taxes or missed a new assessment, the shortfall rolls forward.
Servicers are allowed to collect a cushion of up to one-sixth of your annual escrow charges, so even a modest miss can push your payment up by $100 or more. **A new tax exemption or a lost one can cut either way.** If you had a homestead exemption and it was removed—or if you bought recently and the seller's old exemption was still baked into the estimate—your number will be off.
New construction is a common trap: the first year's tax bill often reflects unimproved land value, then jumps once the house is assessed. **What you can actually do.** First, read the escrow analysis statement carefully and check the math against your actual tax bill and insurance declarations page.
Errors happen, and servicers do correct them.
Second, ask whether you can spread the shortage over 12 months instead of paying it in a lump sum; many servicers allow this, though it keeps your payment higher for a year.
Third, shop your homeowners insurance at renewal—switching carriers is often the fastest way to shrink next year's escrow number.
Fourth, make sure every exemption you qualify for is actually filed with your county.
One more thing worth knowing: a shortage is not the same as a missed payment, and it should not be reported as a late payment.
If your servicer is threatening collections over a shortage you weren't told about, ask for the escrow account history in writing.
The frustrating truth is that escrow shortages are less a sign you did something wrong and more a sign that your servicer's estimates lag reality by a year.
Check the math, ask for a payment spread, and shop that insurance policy before renewal season.
Final Thoughts
A few phone calls now can keep next spring's letter from being worse.