Refinance or just pay extra?

Updated April 2026.

You have a loan. You have some extra cash. You've heard rates dropped. Two ways to use that cash: refinance to a lower rate, or throw it at principal. They look similar on paper. The math is different.

This is the crossover page between the two questions — they look alike, they aren't. If you already know you want a new loan, jump straight to the refinance calculator or the break-even calculator for how long it takes to recover closing costs. If you already know you want to send extra cash into the current loan, start with lump sum vs extra monthly or how extra payments move the payoff date. The rest of this page is for the comparison.

Which one usually wins

• Refinancingtends to come out ahead when the rate drop is meaningful (a common rule of thumb: ~0.75 points on a mortgage, ~1+ on smaller loans) and you'll keep the loan long enough to recover closing costs.
• Prepayingusually wins when the rate drop is small, closing costs are high relative to remaining balance, or you'll pay the loan off within 2-3 years anyway.
• Doing bothoften beats either alone. Refi to the new rate, then keep paying your old payment as “extra principal.” The savings stack.

If you read nothing else, the answer is almost always “both.” The trick is committing to the old payment amount BEFORE the new lower minimum starts feeling normal — see Option C below.

What the math looks like on a real loan

A worked example on a $250,000 mortgage with 20 years remaining at 7% APR (current monthly payment ~$1,938).

Option C is the move I'd take if it's available. It's also the move most people don't take, because the lower payment is too tempting to leave on the table. If you're going to refinance, write down the old payment amount and set autopay at that amount before the new lower minimum starts feeling like the new normal. The decision needs to happen at signing, not a year in.

Numbers above use the standard amortization formula and round to the nearest thousand. Plug your loan into the mortgage payoff calculator to get exact numbers.

When prepayment beats refinance outright

• Small remaining balance.Closing costs of $5,000-10,000 don't pencil out on a $50k personal loan. Just pay extra.
• Short remaining term.If you're 4 years into a 5-year loan, you're mostly paying principal already. Refi closing costs eat the rate savings.
• You'll pay off within 2-3 years.Break-even on closing costs typically runs 24-48 months. If you'll be done before that, refi is a loss.
• Federal student loans. Refinancing federal into private strips forgiveness eligibility, income-driven repayment, and discharge protections. Almost always wrong on federal loans. Prepay instead, if you prepay at all — punch your loan into the student-loan payoff calculator to see what an extra $50 or $100 a month actually saves.
• Loans with prepayment penalties. Some SBA, jumbo mortgage, and subprime auto loans charge for prepayment in the first few years. The penalty plus closing costs of a fresh refi is often larger than the rate savings. Read the prepayment-penalties guide before you decide either way.

The common thread across these: closing costs eat the win when there isn't enough term left for the rate cut to compound. Refi math quietly punishes short timelines.

When refinance beats prepayment

• Large remaining balance + meaningful rate drop. On a $400k mortgage with 25 years left, a 1.5-point rate cut saves $80k+ over the term — far more than any reasonable prepayment schedule would.
• Adjustable-rate loan moving to fixed. Refinancing an ARM to a fixed-rate locks in your rate. The risk-reduction is worth the closing costs even if the headline savings look small.
• Cash-out for higher-return use. Pulling equity via cash-out refi to invest in a business or a higher-return asset can pencil out — but only if the math actually works after tax. The invest-vs-prepay calculator shows the breakeven return rate you'd need; if your alternative asset can't clear that hurdle, the cash-out is just shifting debt around. Not a reflexive yes.
• Credit score has improved 50+ pointssince origination, even if rates haven't moved much. Better rate tier alone can justify a refi.

How to actually decide

1. Get a refi quote with actual closing costs (not just the advertised rate).
2. Calculate break-even: closing costs ÷ monthly savings — or use the refinance break-even calculator, which also flags the term-extension trap (lower monthly, higher total) so you don't pick the wrong refi shape. Stay longer than break-even = refi might win.
3. Run both scenarios on the calculator with the same total monthly outlay. Whichever ends sooner with less total interest wins. If it's close, the refi+keep-paying-old-amount combo usually edges them both.

Sources and references

• CFPB — Refinance walkthrough — consumer-protection guidance on refinance break-even decision-making.
• Federal Reserve G.19 Consumer Credit — APR trend data used to size “is this rate drop meaningful” thresholds.
• CFPB — Prepayment penalties on personal loans — authoritative source on whether prepay-vs-refi math is even available on a given loan.

FAQ

Go next

• If you're leaning toward a new loan, run the numbers on the refinance calculator or check the months-to-recover-costs on the break-even calculator.
• If you're leaning toward sending extra cash into the current loan, one big payment or smaller extra payments is the next call, and check the fee before you prepay if the loan is auto, SBA, or jumbo-mortgage.
• If the underlying question is whether to refinance at all (versus sell-and-buy or stay put), read refinance vs sell-and-buy.

Written by James L. Wu. The numbers above are illustrative — closing costs vary by lender, prepayment penalty schedules vary by loan, and the right answer for your loan depends on inputs you have to gather from your specific paperwork. See the editorial policy for sourcing.