Refinance Break-Even Calculator

The Break-Even Formula

The core calculation is straightforward:

Break-Even Months = Closing Costs ÷ Monthly Savings

Where monthly savings = current payment minus new payment. This tells you the exact month your accumulated savings fully reimburse the upfront cost. After that month, every payment is net savings.

The Cumulative Cost Comparison

The chart shows something more nuanced than just the break-even month. It plots cumulative costs for each path:

• Keep current loan: cumulative interest paid year by year (no upfront cost)
• Refinance: closing costs (paid immediately on day 1) plus cumulative interest paid on the new loan

The refi line starts above the current loan line because of that upfront cost. As monthly savings accumulate, the refi line bends down faster. The exact year the lines cross is the break-even year — visible directly on the chart.

If you sell before the crossover, keeping the current loan cost less in total. If you stay past the crossover, refinancing was the right call.

Why Term Length Matters

Refinancing to a longer term lowers your monthly payment but increases total interest because you're paying for more months. The calculator's cumulative comparison accounts for this — if you extend from a 25-year remaining loan to a new 30-year, the refi line may cross back above the current loan line later in the chart even after an initial period of savings.

Refinancing to a shorter term (15 years) does the opposite: higher monthly payment but significantly less total interest. The break-even is typically longer (higher monthly payment means less monthly savings), but the long-run net savings can be dramatic.

1. Any Time Rates Drop Meaningfully

As a rule of thumb, refinancing is worth exploring when you can reduce your rate by at least 0.5–1%. Run this calculator with your actual loan balance, your lender's quoted rate, and realistic closing cost estimates to see the exact break-even for your situation — not a generic rule.

2. Before Accepting a "No-Closing-Cost" Refi

Lenders market no-closing-cost refinances aggressively, but there's no free lunch — you pay through a higher rate instead. Model both options: (a) your current loan vs. a standard refi with closing costs, and (b) your current loan vs. the no-closing-cost refi at the higher rate. The winner depends on how long you stay.

3. Deciding Between 15-Year and 30-Year on a Refi

Run the calculator twice with the same closing costs, once with each term. A 15-year refi typically has a lower rate and dramatically less total interest, but a higher monthly payment. Compare the break-even and net savings for your planned stay to see which term is actually cheaper for your time horizon.

4. Refinancing Out of an ARM Before It Adjusts

If you have an ARM approaching its adjustment date and rates have risen, the calculator shows whether locking into a fixed rate at today's levels saves money relative to staying in the ARM at its expected adjusted rate. Enter the ARM's current balance as your current balance, the expected adjusted rate as your current rate, and today's fixed rate as the new rate.

5. Evaluating Cash-Out Refinancing

A cash-out refi increases your balance. Enter the higher balance as the new loan amount (current balance plus cash taken out) and compare the higher new payment against your current payment. If the cash-out makes your monthly payment go up, the break-even in this calculator will be negative (no monthly savings) — the decision then hinges on what you do with the cash, not the payment comparison.