What is a mortgage escrow account?

The definition

A mortgage escrow account (also called an impound account) is an account your loan servicer uses to collect and hold money for recurring property costs — mainly property taxes and homeowners insurance — and to pay those bills on your behalf when they come due. Each month you pay roughly one-twelfth of the annual total alongside your principal-and-interest payment.

What it covers

The monthly mechanic

The servicer estimates your annual taxes and insurance, divides by 12, and adds a small cushion (federal RESPA rules cap the cushion at about two months of escrow payments). That escrow amount is bundled into your monthly mortgage payment. So a "mortgage payment" is often PITI — Principal, Interest, Taxes, and Insurance — not just principal and interest.

Annual escrow analysis (why your payment changes)

Once a year the servicer runs an *escrow analysis*, comparing what it collected against what the bills actually cost. Because tax assessments and insurance premiums drift upward, the result is usually:

• a shortage → your monthly escrow rises to refill the account (and you may owe a lump sum), or
• a surplus → you get a refund and the monthly amount may drop.

This is why a fixed-rate mortgage payment can still change year to year — the principal-and-interest part is fixed, but the taxes-and-insurance part is not.

A shortage example

Say your escrow collected for $4,800 of annual taxes and insurance ($400/month), but a reassessment pushed the real total to $5,400 — the account is now $600 short for the year. The annual analysis splits that into two adjustments: the monthly escrow rises ~$50 ($600 ÷ 12) to cover the new ongoing cost, plus a temporary catch-up to refill the under-collected amount (or you pay a one-time lump sum). That is how a "fixed" mortgage payment can climb several hundred dollars a year even when the interest rate never moved.

Why lenders require it

Unpaid property taxes can become a lien that outranks the mortgage, and a lapsed insurance policy leaves the lender's collateral unprotected. Escrow guarantees those bills get paid, protecting the lender — and sparing the borrower from large, irregular bills. Escrow is typically required when the down payment is small (high loan-to-value); some loans allow you to waive escrow and pay taxes and insurance yourself, sometimes for a fee.

A note on the word "escrow"

"Escrow" has a second, separate meaning: at closing, a neutral third party holds funds and documents until the sale conditions are met. That closing escrow is a one-time process; the *escrow account* described here is the ongoing monthly one tied to your mortgage.

This explains the mechanics, not financial advice. It describes how the math works — it does not recommend a loan, lender, or whether to borrow, buy, or refinance. Terms, rates, and rules vary by lender and jurisdiction; verify current figures with the lender and, for your own situation, a HUD-approved housing counselor or a fee-only fiduciary advisor (e.g. via NAPFA).

Cross-reference: see /pages/what-is/amortization for the principal-and-interest part of the payment + /pages/what-is/compound-interest for how the underlying loan interest accrues.