In lending, principal is the amount you originally borrowed. Each monthly payment splits between interest and principal reduction. Over time, a larger share goes toward principal.
Principal in Investing
In investing, principal is the original sum you put to work. Your returns (interest, dividends, capital gains) are calculated on top of this base amount. Preserving principal is a primary goal of conservative strategies.
Making Extra Principal Payments
Any payment beyond your required monthly amount, if directed specifically to principal, reduces the balance that future interest is calculated on. Most lenders let you designate extra payments as "principal only" — check your statement or loan servicer's portal to confirm the extra amount isn't just being applied to next month's payment instead.
Principal Balance vs. Payoff Amount
Your current principal balance isn't the same as your full payoff amount, which also includes accrued interest since your last payment and may include a prepayment or discharge fee on certain loan types. Always request an official payoff quote before closing out a loan.