Rates & interest

Principal

The amount you borrow, separate from interest. Each payment reduces principal a little more as the loan amortizes.

Sources

What does principal mean?

Principal is the sum you actually borrowed, distinct from the interest charged to borrow it. Every mortgage payment splits between the two, and as the loan amortizes a steadily larger share goes to principal — which is why extra payments, applied straight to principal, shorten the loan and cut total interest so effectively. Your remaining principal is the payoff balance.

Principal vs. interest, month by month

On a $300,000, 30-year loan at 7%, the payment is about $1,996. In the first month $1,750 of that is interest and only about $246 reduces the principal. Ten years in, the balance is still about $257,400; it takes roughly 20 years to get it below $172,000.

That slow early paydown is why the principal balance — not the monthly payment — is the number to watch when you think about refinancing, selling, or the equity you have built.

What extra principal does

Every extra dollar sent to principal stops interest from accruing on that dollar for the rest of the loan. Adding $200 a month to the loan above pays it off in about 23 years instead of 30 and saves roughly $116,600 in interest. Mark extra payments as “principal only” so the servicer does not hold them as an early regular payment.

Frequently asked

How do extra principal payments work?

Any amount you pay above your scheduled payment, applied to principal, immediately lowers the balance interest is charged on. That cuts total interest and shortens the loan — often by years — without changing your required monthly payment.

What is the difference between principal and interest?

Principal is the money you actually borrowed; interest is the fee charged to borrow it. Each payment covers the interest due first, and whatever remains reduces the principal — a split that shifts toward principal as the loan amortizes.