Head-to-head
Refinance vs Paying Extra
Refinancing and overpaying are both ways of paying less interest, and they work on opposite sides of the same equation. A refinance changes the rate. An extra payment changes the balance. Neither is universally better, and the arithmetic is not close in every case — it depends on how far the new rate falls, what the closing costs are, and how long you intend to stay.
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A refinance has a fixed entry cost: appraisal, title, origination, recording, typically two to five percent of the balance. That money is spent the moment you sign, so the saving has to accumulate past it before the refinance is worth anything. The break-even is usually measured in months, and if you sell or refinance again before it, you lose.
An extra payment has no entry cost and no lock-in. It reduces the principal immediately, which cuts every future interest charge, and it shortens the term rather than restarting it. Its weakness is that it depends on you continuing to pay: the contract still says twenty-five years, and skipping months undoes the progress.
The example below is deliberately unflattering to the refinance — a full percentage point off, costs financed, and a borrower who could afford three hundred dollars a month either way. Paying extra wins on total interest, and the reason is structural: it shortens the term, while the refinance keeps the same twenty-five years and simply charges less for them.
Refinance
How To Calculate Refinance Savings
Refinancing replaces one loan with another, usually at a lower rate. The monthly saving is the obvious gain, but closing costs and a possibly longer term mean the break-even point and the lifetime interest matter just as much.
Extra payments
How To Calculate Mortgage Payoff
Every extra dollar paid against a mortgage removes principal that would otherwise be charged interest for the rest of the term. A modest extra payment can cut years off the loan and save tens of thousands.
How They Differ
| Attribute | Refinance | Extra payments |
|---|---|---|
| What changes | The interest rate, for the whole remaining term | The principal balance, faster |
| Upfront cost | Closing costs, sometimes rolled into the new balance | None |
| Monthly payment | Falls, because the rate fell | Rises by the amount you add |
| Term | Restarts — a fresh 25 years on the new loan | Shortens, and never extends |
| Total interest | Lower rate, same length | Same rate, shorter length |
| What it requires | Equity, income, credit and an appraisal | Spare cash and the discipline to keep paying |
| Reversibility | Another refinance, another set of costs | Stop any month with no penalty |
| Rate risk | Locks in the lower rate permanently | Keeps whatever rate you already have |
| If rates fall again | You refinance again and pay costs again | You are unaffected, and can still refinance later |
| Best when | The rate drop is large and you will stay past the break-even | You have spare cash and a rate you can live with |
The Same Numbers, Both Ways
A $320,000 balance with 25 years left at 6.5%. Option one refinances to 5.25% with $4,500 of costs rolled in. Option two keeps the loan and adds $300 a month.
- Balance
- $320,000
- Current rate
- 6.5%
- Remaining term
- 300 months
- Refinance rate
- 5.25%
- Closing costs
- $4,500
- Extra payment
- $300 a month
| Line | Refinance | Extra payments |
|---|---|---|
| Monthly payment | $1,944.56 | $2,460.66 |
| Total interest paid | $258,867.65 | $235,174.51 |
| Interest saved | $69,331.22 | $93,024.37 |
| Months to clear the balance | 300 | 226 |
| Upfront cash needed | $4,500.00 | $0.00 |
| Rate you are left with | 5.25% | 6.50% |
Refinancing drops the payment from $2,160.66 to $1,944.56 and lifetime interest to $258,867.65, a saving of $69,331.22. Paying $300.00 extra instead leaves the payment at $2,460.66 but clears the balance in 226 months and saves $93,024.37 — $23,693.14 more than the refinance, with no closing costs at all.
When To Use Each
Refinance
- The new rate is at least three quarters of a point lower and you expect to stay past the break-even.
- You are already planning to stay for a decade, so the closing costs have time to be absorbed.
- You want to shorten the term as well, moving from 25 years to 15 at the same time.
Extra payments
- You have spare cash each month and want the saving without an appraisal or a credit check.
- Your current rate is already competitive, so a refinance would barely clear its own costs.
- You may move within two years, where closing costs would never be recovered.
Common Questions
How long until a refinance pays for itself?
Divide the closing costs by the monthly saving. Here $4,500 against $216.10 is about 21 months. If you might move or refinance again inside that window, the refinance is a loss rather than a saving.
Does paying extra always beat refinancing?
No. When the rate drop is large the interest saved dwarfs anything an affordable extra payment can do, because the lower rate applies to the whole balance from day one. The two are not substitutes — the strongest position is usually a refinance and then extra payments on top.
Should I shorten the term when I refinance?
Only if the payment stays comfortable. Moving from 25 years to 15 cuts the rate further but raises the payment, and the point of the exercise is to pay less overall rather than to be forced into a higher monthly commitment.
Do extra payments go to principal?
Only if you tell the servicer. Many payment forms default to next month's instalment, which pays interest first and leaves the balance untouched. Mark the payment as principal-only, or the whole exercise is a prepayment rather than an overpayment.
Is the interest I avoid taxable?
No. Interest you do not pay is not income, so there is nothing to declare. The mortgage interest deduction shrinks as a result, which is a small offset if you itemise, but the saving is still a saving.
More Comparisons
- Car Lease vs Auto Loan
A $35,000 car with $3,000 down and a 55% residual leases for $418.23 a month; the same balance on a 6.5% three-year loan costs $980.77. The lease spends $18,056 and ends with nothing, the loan spends $38,308 and ends with a $19,250 car.
- Present Value vs Future Value
Present value discounts a future sum back to today; future value compounds today's money forward. At 6% over ten years, $10,000 promised later is $5,583.95 now, and $5,583.95 invested now is $10,000 later.
- Simple Interest vs Compound Interest
Simple interest charges the principal only; compound interest charges the balance. On $10,000 at 5% over 10 years that gap is $1,288.95 — here is where it comes from.
Sources
- Mortgages — refinancing and shopping for a loan — Consumer Financial Protection Bureau
- Primary Mortgage Market Survey — weekly rate benchmarks — Freddie Mac
- Amortisation and the effect of extra principal payments — Fannie Mae
Both methods sit in Finance.