Yes, paying off a personal loan early saves interest. The amount saved depends on your interest rate and how early you pay it off. A $10,000 loan at 12% APR with 36 months remaining saves about $1,400 in interest if paid off today. Most personal loans have no prepayment penalty (this used to be common but is rare now), so paying early is essentially free except for the lost benefit of investing or using the cash elsewhere.
How loan interest works. Personal loans use simple interest calculated on the remaining principal. Each monthly payment is allocated between interest (based on current balance times the periodic rate) and principal (the rest of the payment). Early in the loan, more of each payment goes to interest. As the balance shrinks, more goes to principal.
The interest-savings calculation. A $10,000 personal loan at 12% APR over 5 years has a monthly payment of $222. If you pay it off after 24 months (36 months remaining), the remaining balance is about $5,400 and you have already paid roughly $1,920 in interest. The remaining 36 months of payments would have included $1,580 in additional interest. Paying off now saves that $1,580.
Per-dollar interest savings. The savings per extra dollar paid increases as the loan ages. Early in the loan, much of the extra payment reduces principal but the long remaining timeline still produces significant future interest. Late in the loan, every extra dollar reduces principal that would have otherwise generated little additional interest.
No prepayment penalty (usually). Most major personal loan lenders (SoFi, Marcus, Discover, LightStream, most credit unions) do not charge prepayment penalties. The loan can be paid off at any time without additional cost. A few lenders (especially specialty or sub-prime lenders) still charge prepayment penalties; check your loan agreement.
Lump-sum payoff. Most lenders accept a final lump-sum payoff. Contact the lender for an exact payoff quote (the amount due includes principal, accrued interest through the payoff date, and any fees). Send the payoff amount via the lender's preferred method (electronic transfer or check). The loan account is closed once the payoff is processed.
Extra principal payments. If you cannot pay off the loan in full but can make extra principal payments, this also saves interest. Send extra payments specifically marked "apply to principal." Some lenders default to applying extra payments to next month's payment; specifying principal application ensures you reduce the balance.
Credit score impact. Paying off a personal loan and closing the account causes a small score drop (5-15 points typically) from the loss of an active installment account. The drop is temporary and is offset by the absence of the monthly payment in future DTI calculations. Net effect on lending capacity is usually positive.
Opportunity cost. Money used to pay off a personal loan is money not invested or held in savings. At 12% loan APR, paying off the loan is a guaranteed 12% return (the interest you avoid). Most investment options cannot guarantee that return; high-yield savings accounts pay 4-5%, the stock market averages 7% over long periods. Loan payoff is mathematically usually the best use of the cash.
When not to pay off early. If you have a low loan rate (under 6%) and could invest the cash for higher returns in a tax-advantaged account, the math may favor investing. If your loan has a balloon payment that would be cheaper than full early payoff, wait. If paying off the loan would deplete your emergency fund, build the emergency fund first.
Practical advice. If you have idle cash and a personal loan above 7% APR, paying off the loan is almost always the best use. Calculate the exact savings (use a payoff calculator with your remaining balance, rate, and term). Verify no prepayment penalty. Make the payoff payment. Use the freed-up monthly cash to rebuild savings or invest going forward.