The full explanation
When you start, the principal is the loan amount; with every payment a part goes toward reducing it, and what remains is called the balance. Interest is computed on that balance, so the less principal you owe, the less interest you pay. On your monthly payment you will see P&I: principal and interest, the part of the payment that goes to the loan, separate from taxes and insurance.
An example
Marta's payment has four parts: principal, interest, taxes and insurance. Only the first two pay the loan; the other two go into an escrow account.
With real numbers
Computed with official data for the whole U.S. In your county the numbers may differ.
- Principal and interest payment
- $1,803
- First payment, to interest
- $1,593
- First payment, to your debt
- $211
On a $266,160 loan over 30 years at the average rate of November 5, 2026 (7.18%), principal and interest come to $1,803 a month. In the first payment, $1,593 goes to interest and only $211 lowers your debt. Over the years, the part that lowers your debt grows.
Computed with: American Community Survey (ACS) 5-year estimates (2020–2024) · Freddie Mac Primary Mortgage Market Survey (PMMS) (November 5, 2026) · Fannie Mae Selling Guide B7-1-01 — Provision of Mortgage Insurance (October 17, 2026)
You will see it in…
- The Loan Estimate (“Loan Amount” and “Principal & Interest”)
- Monthly statements (“principal balance”)
- Our mortgage calculator, in the payment breakdown
