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Should I Refinance?

Compare your current mortgage to a new loan. See monthly savings, break-even timeline, and total cost comparison to make an informed decision.

Last updated October 18, 2026

How our math works

Assumptions
  • New loan: 6.25% fixed for 30 years; current loan: 7.5% with 27 years remaining
  • Closing costs of $8,000 as entered; both loans fully amortizing
  • Rates shown are interest rates used for estimation only — not APRs and not offers. APR reflects fees and other loan costs and may differ from the interest rate shown.
My scenario

Enter income, debts, price, and rate once. Every calculator pre-fills.

Current Loan

$

%

$

Principal & interest only

years

New Loan

%

$

Typically 2-5% of loan amount

Monthly Savings

$286

Break-even in 28 months (2.3 years)

Current Payment
$2,306
New Payment
$2,020
Closing Costs
$8,000
Total Savings
$20,105
You save over the life
Payment Comparison

Current vs new monthly payment breakdown

CURRENT LOAN

$2,306

7.5% for 27 more years

NEW LOAN

$2,020

6.25% for 30 years


Save $286/month
Break-Even Analysis

When your savings exceed closing costs

At close: Closing costs remaining $8,000; 12 mo: Savings recovered $3,437, Closing costs remaining $4,563; 24 mo: Savings recovered $6,875, Closing costs remaining $1,125; Break-even (28 mo): Savings recovered $8,000.

Closing costs (financed)

$8,000

Monthly savings

$286

Recovered after 12 months

$3,437

Remaining after 12 months

$4,563

Break-even

28 months


How break-even is calculated: closing costs ÷ monthly payment savings. This payment-only method doesn't account for resetting your loan term or the slower equity build that comes with it — if the new term is longer than your remaining term, check the lifetime cost comparison below before deciding.
Lifetime Cost Comparison

Total amount paid over the life of each loan

Current Loan Total

$747,144

New Loan Total

$727,039


TOTAL LIFETIME SAVINGS

$20,105

Interest savings: $28,105

Key Insights

What these numbers mean for you

Analysis

Closing costs of $8,000 are financed into the new loan, so your new balance starts at $328,000 — you're borrowing the costs (and paying interest on them) rather than paying them upfront.

Savings

You'll save $286/month, but it will take 28 months (2.3 years) of those savings to recoup the $8,000 closing costs.

Savings

Over the life of the loan, you'll save $20,105 total (including the financed closing costs).

Savings

You'll save $28,105 in interest charges alone.

Warning

Warning: You're extending your loan by 3 years. A lower payment from a term reset also means rebuilding equity more slowly — the break-even figure above only counts payment savings.

Refinancing Makes Sense

By refinancing from 7.5% to 6.25%, you'll save $286/month and $20,105 over the life of the loan. After 28 months of payment savings, you'll have recovered the $8,000 closing costs financed into your new loan.


Here are the exact formulas behind your numbers. No black boxes — just math.

Refinance Analysis

Current Scheduled P&I

$2,306
Balance × r × (1+r)ⁿ ÷ [(1+r)ⁿ − 1]Payment implied by your current balance, rate, and years remaining. If your entered payment differs materially, this computed value is used.

New Loan Amount

$328,000
Current Balance + Closing CostsClosing costs are financed — rolled into the new loan balance rather than paid upfront.

New Monthly Payment

$2,020
New Loan × r × (1+r)ⁿ ÷ [(1+r)ⁿ − 1]Payment at the new rate and term.

Monthly Savings

$286
Current Payment − New PaymentHow much less you pay each month. Negative means the refinance raises your payment.

Break-Even Months

28 months
Closing Costs ÷ Monthly SavingsMonths of payment savings needed to recoup the financed closing costs. This method ignores the term reset and slower equity build.

Total Interest Saved

$28,105
Old Total Interest − New Total InterestLifetime interest savings from the lower rate. Negative means you pay more interest overall.
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Frequently Asked Questions

A useful rule of thumb: refinancing is worth a close look when you can cut your rate by about 0.75-1 percentage point or more and you plan to stay past the break-even point — the month when accumulated payment savings exceed your closing costs.

Divide total closing costs by your monthly payment savings. For example, $6,000 in costs with $250/month savings breaks even at 24 months. If you might sell or refinance again before then, the refi likely loses money.

Refinancing into a new 30-year term re-extends your payoff date, which can lower the payment but raise lifetime interest even at a lower rate. This calculator compares total cost over your remaining horizon — not just the monthly payment — so the verdict accounts for the reset.

Methodology & Data Sources

Calculations use standard amortization formulas on the inputs you provide. Where available, the “Show Me the Math” section above walks through the exact formulas behind your result. Default interest rate (30-yr fixed: 6.75%) is based on national averages from the Freddie Mac Primary Mortgage Market Survey (PMMS), week of October 15, 2026. Replace defaults with your actual quote for precise results.Content reviewed by the Dett.io editorial team. Last updated: .
Important: This calculator provides estimates for educational purposes only. Results are not a loan offer, pre-qualification, pre-approval, or commitment to lend. Actual rates, terms, payments, and eligibility are determined by mortgage lenders based on your complete financial profile, credit history, property appraisal, and current market conditions. Dett.io is not a lender, broker, or financial advisor. Consult qualified professionals before making financial decisions. See our Terms of Use for full details.