Your escrow payment is one-twelfth of the property tax, homeowners insurance and other bills your servicer pays for you each year, plus a share of any shortage from last year. Once a year the servicer runs an escrow analysis to reset it. Federal rules (RESPA’s Regulation X, 12 CFR 1024.17) limit how much extra it can hold and say what it must do with a shortage or surplus.
Federal escrow rules
- Base monthly deposit
- 1/12 of yearly bills
- Maximum cushion
- 1/6 of yearly bills
- Two months of deposits
- Surplus refund
- $50 or more
- Within 30 days, if you are current
- Shortage repayment
- 12+ months
- Required option if the shortage ≥ 1 month’s deposit
How the analysis works
- Add up the bills. The servicer estimates every escrowed bill for the next 12 months: tax installments, insurance renewal, flood insurance and similar items.
- Run a trial balance. Starting from zero, it adds one-twelfth of the total each month and subtracts each bill in the month it is due. The lowest point of that running balance shows how much money must already be in the account so it never goes negative.
- Add the cushion. The servicer may require the low point to sit at a cushion of up to one-sixth of the yearly bills instead of zero. That gives the required starting balance.
- Compare with your balance. If you have less than the required starting balance, the difference is a shortage. If you have more, it is a surplus.
Worked example
Your escrow year starts in January. Taxes are $6,000 a year in two $3,000 installments due in June and December. Insurance is $2,400, renewing in August. You start the year with $1,200 in escrow and currently pay $650 a month into it.
| Step | Math | Result |
|---|---|---|
| Yearly bills | $6,000 + $2,400 | $8,400 |
| Base deposit | $8,400 ÷ 12 | $700 |
| Trial balance low point | After the December tax bill | $0 |
| Cushion (2 months) | $700 × 2 | $1,400 |
| Required starting balance | $1,400 − $0 low point | $1,400 |
| Shortage | $1,400 − $1,200 | $200 |
| New monthly escrow | $700 + $200 ÷ 12 | $716.67 |
Your escrow payment rises by about $67 a month: $50 because the bills went up, and about $17 to repay the shortage over 12 months. Because $200 is less than one month’s $700 deposit, the servicer could instead ask you to repay it within 30 days.
Edge cases
- The cushion is a ceiling, not a requirement. A servicer may hold less or none, and if your loan documents or state law set a lower cushion, the lower limit applies.
- Tax bills that change mid-year, or a new insurance policy, can create a shortage before the next annual analysis.
- Servicers apply exact payment dates, so their numbers can differ slightly from this estimate. Compare your annual escrow statement with this tool line by line.
What to do next
If the shortage came from a tax increase, check your assessment with the property tax calculator. If insurance drove it, review your coverage with the homeowners insurance coverage estimator and shop quotes. See your full payment with the mortgage calculator, and read how escrow accounts work.