Escrow shortage calculator.

How the numbers work

Per 12 CFR 1024.17, the monthly escrow payment is one-twelfth of the yearly bills the servicer expects to pay, and a servicer may also keep a cushion of no more than one-sixth of those yearly bills. This calculator adds one month of payment (1/12 of the total) at the start of each month, subtracts each bill in the month you enter, and finds the lowest balance in the year. The shortage is the cushion minus that low balance, if positive. Spreading it over 12 months adds shortage/12 to the base payment.

Worked example. Bills of $3,600 (April), $2,400 (June) and $3,600 (October) total $9,600, so the base payment is $800 and the cushion is $1,600. Starting from $1,500, the balance bottoms out at -$100 in October. Shortage: $1,600 - (-$100) = $1,700. That is more than one month of escrow, so it may be left or spread over 12+ payments: $800 + $1,700/12 = about $942 a month.

Shortage options: under one month of escrow, the servicer may leave it, collect it within 30 days, or spread it over at least 12 months; at one month or more, leave it or spread over at least 12 months. A deficiency (negative balance) may be spread over two or more payments. These apply when you are current on payments. Servicers must send an annual escrow statement within 30 days of the end of the computation year.

Sources, checked 2026-09-30: 12 CFR 1024.17, Escrow accounts. Which loans must have escrow: 12 CFR 1026.35.

Planning estimate, not legal or financial advice. Servicers apply the full Appendix E projection with their own timing, and your loan documents or state law may differ. Your servicer's statement controls. If a lump sum is due, compare it with the refinance break-even before making changes.

FAQ

What is an escrow shortage?

The projected low balance in your escrow account for the coming year falls below the target cushion. It usually follows a property tax or insurance premium increase.

How big can the cushion be?

No more than one-sixth of the estimated total annual escrow payments, roughly two months of bills.

Can my servicer demand the shortage all at once?

Only if it is less than one month of your escrow payment, and then it must give you the option to repay within 30 days or over at least 12 months. Larger shortages can be left alone or spread over at least 12 monthly payments.

What is a deficiency?

A negative balance, for example when the servicer advanced money to pay a bill. A deficiency may be spread over two or more equal monthly payments, or collected within 30 days if smaller than one month of escrow.

Why does my payment rise even with no shortage?

The base escrow payment is one-twelfth of projected annual bills, so any tax or insurance increase raises it.