Refinance Break-Even Calculator

Read the calculator result

This calculator compares an existing fixed-rate mortgage with a proposed fixed-rate replacement. It estimates the payment change, the time needed for monthly payment savings to recover cash closing costs, and borrowing costs over the holding period you choose. These are different measures, and considering them together makes the comparison more useful.

A smaller payment doesn’t automatically mean a cheaper loan. Restarting a longer term can lower the monthly amount while leaving more debt outstanding later. The CFPB’s refinancing handout explains that different goals, such as shortening the term or lowering payments, can lead to different choices.

The calculator assumes no cash-out, unchanged interest rates, scheduled monthly payments, and closing costs paid in cash. It doesn’t include tax effects, changes in mortgage insurance, property-value forecasts, or investment returns on cash you might keep. Example rates are hypothetical and aren’t current offers.

Refinance break-even: gather comparable numbers for both loans

Current balance: enter the remaining principal, not the original amount borrowed. A lender’s payoff quote may also include accrued interest or fees. Use the quote when reviewing an actual transaction and identify anything outside principal.

Current rate and remaining months: enter the existing contract interest rate and time remaining. A loan originally written for 30 years may have only 25 years left. Entering a fresh 30-year term for both loans would hide the effect of restarting repayment.

Proposed rate and term: enter the new contract interest rate and proposed number of monthly payments. This payment model uses interest rate, while APR also incorporates certain borrowing charges. The CFPB explains the distinction. Keep the actual fees visible rather than inserting an APR and adding the same fees again.

Cash closing costs: enter the nonrefundable transaction costs you expect to pay after applicable lender credits. Distinguish fees from escrow deposits and prepaid amounts that may represent timing differences rather than entirely new expenses. Review the written disclosures to determine what belongs in your comparison.

Holding period: choose how long you expect to keep the new loan before selling, refinancing again, or paying it off. This is an assumption, not a prediction. Compare several horizons if the timing is uncertain.

How the calculator works

Simple break-even equals cash closing costs divided by monthly principal-and-interest savings. If closing costs are $5,000 and payment savings are $200 monthly, the simple break-even point is 25 months. It measures recovery of the upfront cash through lower required payments.

The calculation requires positive monthly payment savings. If the new payment is unchanged or higher, there’s no simple payment-savings break-even. That doesn’t automatically rule out a refinance with a shorter term: higher payments can still reduce interest. It means this particular cash-recovery measure isn’t applicable.

Simple break-even doesn’t compare principal balances at the end of the holding period. Because a payment contains both principal and interest, two loans with different amortization schedules can have different remaining balances even if their cash payments look similar.

Refinance break-even calculator example: 7% to 6% with the same remaining term

Consider a hypothetical $300,000 balance with 25 years, or 300 months, remaining at a 7% fixed contract rate. Compare a new $300,000 loan at 6% for the same 300 months, with $5,000 closing costs paid in cash and no cash-out.

The monthly principal-and-interest saving is approximately $187.43. Dividing $5,000 by the unrounded monthly saving gives about 26.68 months. In whole scheduled payments, the cash outlay is recovered during the 27th payment period under the model.

This result doesn’t say that all aspects of the refinance become equally favorable in month 27. It answers a narrower question about cash closing costs and lower required payments. The balance-aware comparison below shows why another cost measure can produce a different perspective.

Refinance break-even: compare interest, fees, and balances over five years

For a 60-month holding period, the existing loan produces approximately $100,706.71 of interest. The new loan produces approximately $85,770.51 of interest. Adding $5,000 in cash closing costs gives $90,770.51 in modeled new-loan financing costs over the same period, a reduction of approximately $9,936.20.

The new loan’s balance is approximately $3,690.20 lower after five years. Its cumulative payment savings, after the $5,000 cash cost, are approximately $6,246.00. Adding that cash-flow advantage to the balance advantage gives the same $9,936.20 difference in modeled interest and fees.

This reconciliation helps avoid counting principal repayment as a financing expense. Principal payments reduce what you owe; interest and transaction fees are borrowing costs. The analysis doesn’t include the value of investing payment savings or the opportunity cost of using $5,000 at closing.

Watch the effect of extending the term

If you replace a loan with 20 or 25 years remaining with a fresh 30-year loan, the lower payment may reflect both the new rate and the longer repayment period. Compare each loan over the same holding period and inspect remaining principal, not just the monthly saving.

Also compare total interest over each full schedule, while recognizing that different terms span different numbers of years. A useful second scenario keeps the new term close to the current remaining term. That isolates more of the rate effect and makes the consequences of term extension easier to understand.

If you plan to keep paying the old monthly amount on a new lower-rate loan, that’s an extra-payment strategy and requires its own schedule. Don’t assume extra payments are included in a result that uses only the new required payment. Check the new loan’s terms and how principal-only payments are applied.

Handle closing costs and financed fees consistently

Costs paid in cash reduce available savings immediately. Costs financed into the mortgage increase principal and can also generate interest. This calculator’s standard comparison treats the entered closing costs as cash-paid. A proposal that rolls fees into the new balance needs a model that explicitly uses that higher balance.

Don’t assume a “no closing cost” offer has no economic cost. Compare the written rate, credits, principal, and fees. A lender credit can offset cash expenses while changing the pricing of the loan. The CFPB Closing Disclosure explainer helps identify payment, closing-cost, and cash-to-close figures.

Separate continuing homeownership costs from refinancing costs. Property taxes and homeowners insurance generally remain expenses after a refinance, although their payment timing or escrow treatment may change. Mortgage insurance may also change and should be modeled separately when it differs materially between the two loans.

Use several holding periods before making a decision

Try a shorter holding period, your central expectation, and a longer period. A refinance with meaningful upfront costs can look very different if you sell sooner than expected. Keep the assumed date visible rather than treating a precise break-even result as a promise that you’ll stay in the property.

Compare liquidity as well. Paying closing costs may reduce the cash available for essential repairs or emergencies. The emergency fund calculator can describe how much coverage remains after an upfront payment. This doesn’t decide the refinance for you; it adds a cash-reserve consideration to the cost comparison.

Use a written Loan Estimate for a real comparison, and update the model if the quote changes. Check rate-lock terms, prepayment provisions, and any other charges that could affect the transaction. The current lender or servicer can provide a payoff amount for the proposed closing date.

Check the comparison after receiving final documents

Before relying on an earlier estimate, replace tentative inputs with the actual proposed principal, rate, term, and cash costs. A changed credit, fee, or financed amount can move the break-even point. Preserve the earlier scenario so you can identify which input changed rather than simply accepting a different result.

Also confirm that the current-loan payment used by the model matches the relevant principal-and-interest obligation. Escrow collections aren’t the same as loan repayment. If a statement includes an escrow shortage, comparing its total directly with a new principal-and-interest payment would exaggerate apparent savings. Separate the components before drawing a conclusion.

Refinance break-even calculator questions

Is a one-percentage-point rate reduction enough?

There’s no universal rate-drop threshold that determines whether refinancing is worthwhile. Balance, costs, remaining term, proposed term, mortgage insurance, and holding period all matter. Enter the actual proposal and compare cash flow, interest, and remaining principal under consistent assumptions.

Should I use the original loan balance?

No. Use current remaining principal for this estimate and confirm the actual payoff quote before closing. Using the original balance can overstate both the payment and savings when you have already repaid part of the debt.

Why are interest savings different from payment savings?

Payments include principal as well as interest. Two loans can repay principal at different speeds. Comparing interest plus fees measures modeled financing cost, while payment savings measure cash flow. Remaining balances explain much of the difference between those perspectives.

Can I use this for a cash-out refinance?

The standard comparison assumes no cash-out. Receiving additional cash changes the principal and what the transaction provides, so it needs a separate comparison that tracks the extra proceeds, their purpose, and their borrowing cost. Don’t label a larger new loan as directly equivalent to the old balance.

Does this include taxes or future home appreciation?

No. The calculation excludes tax effects, changes in property value, and investment returns on cash. Those factors can matter to a wider decision, but adding an unsupported assumption would make the estimate appear more precise without making it more reliable.