The decision to refinance comes down to one calculation: will the monthly savings from a lower rate exceed the closing costs within a timeframe that makes sense for you? This is the break-even analysis, and it's the only math that matters.
Here's how to run it.
The Break-Even Formula
Take the total closing costs of the refinance and divide by the monthly savings the new rate creates. The result is your break-even point in months.
If refinancing costs $8,000 in closing costs and saves you $350/month, your break-even is 23 months. If you plan to stay in the home longer than 23 months, the refinance is a net win. Every month beyond the break-even point is pure savings.
If the break-even is 48 months but you plan to sell in 36 months, the refinance loses money. The costs exceed the savings within your holding period. This is why the break-even calculation — not the rate itself — is the decision driver.
Closing Costs to Factor In
Refinance closing costs typically run 1.5-3% of the loan amount. On a $500K loan, that's $7,500-$15,000. The specific costs include lender origination fees (0.5-1% of loan amount), appraisal ($500-$800), title insurance ($1,500-$3,000), escrow and recording fees ($500-$1,500), and prepaid items (property tax and insurance escrow adjustments).
Some lenders offer "no-cost" refinances where the closing costs are rolled into the loan balance or offset by a slightly higher rate. These aren't truly free — you're either increasing your loan balance or accepting a higher rate — but they eliminate the upfront cash outlay and change the break-even calculation.
For a true no-cost refinance, the break-even is day one — you start saving immediately because there are no upfront costs to recover. But the savings per month are smaller because your rate is slightly higher. Over a long holding period, a standard refinance with lower rate and out-of-pocket costs usually wins. Over a shorter period, no-cost refinances win because there's no break-even gap.
When the Rate Difference Justifies a Refinance
The old rule of thumb — "refinance when rates drop 1%" — is overly simplified. The right answer depends on your loan balance, closing costs, and holding period.
On a $500K loan, a 1% rate reduction saves approximately $330/month. With $10K in closing costs, the break-even is about 30 months. On a $300K loan, the same 1% rate reduction saves only $200/month. Same $10K in closing costs means a 50-month break-even. The higher your loan balance, the more impactful each rate reduction is.
In the current environment (late February 2026), 30-year fixed rates are near 6%. If your current rate is 6.75%, the savings on a $500K loan are approximately $250/month — a 40-month break-even with typical closing costs. If your rate is 7.5%, the savings jump to approximately $500/month — a 20-month break-even. That's compelling.
If your rate is 6.25%, the savings from refinancing to 6% are roughly $85/month on $500K. At that level, the break-even stretches to 8-10 years. Not worth it unless you're planning to stay in the home for a very long time.
The Rate-Preserving Alternative: HELOC
If your goal is accessing cash rather than reducing your rate, refinancing might not be the right move. A cash-out refinance replaces your entire mortgage with a new one. If your current rate is 3.5% (locked during 2020-2021), replacing it with a 6% refinance increases your cost on the entire balance — not just the cash you're taking out.
A HELOC lets you access equity without touching your first mortgage rate. You keep the 3.5% on your existing balance and take a HELOC at 6.75%-8.5% only on the amount you need. For homeowners with sub-4% rates, this is almost always the better math.
The breakpoint: if your current rate is above 6-6.25%, a cash-out refinance starts to make sense because you're replacing a rate that's close to (or above) current market rates. Below that, preserve your rate and use a HELOC for equity access.
Rate-and-Term Refinance vs. Cash-Out Refinance
These are two different products with different break-even calculations.
Rate-and-term refinance reduces your rate and/or changes your loan term without pulling additional cash. The break-even is purely the rate savings vs. closing costs. This makes sense when your current rate is meaningfully above market and you don't need cash.
Cash-out refinance pulls equity while refinancing. The break-even is more complex because you're comparing the all-in cost of the cash-out refi against alternative ways to access that cash (HELOC, personal loan, etc.). If you need $100K in cash, compare the total cost of getting it through a cash-out refi versus a HELOC over your expected holding period.
Other Reasons to Refinance Beyond Rate
Rate reduction is the most common reason, but it's not the only one. Removing PMI when you've reached 80% LTV through appreciation can save $200-$500/month with no break-even gap if the refinance costs are low. Shortening your term from 30 to 15 years accelerates equity building and reduces total interest paid — though monthly payments increase. Removing a co-borrower after a divorce or partnership change requires a refinance. Switching from adjustable to fixed rate provides payment certainty if you're in an ARM that's adjusting upward.
The Bottom Line Decision Framework
Run the break-even calculation. If the break-even is under 24 months and you plan to stay in the home 5+ years, the refinance is almost certainly worth it. If the break-even is 24-48 months, it depends on your confidence in your holding period. If the break-even is over 48 months, look carefully at whether a HELOC or no-action is the better choice.
And remember: rates don't need to hit a magic number. The only number that matters is your specific break-even on your specific loan.
→ Compare HELOC vs. cash-out refinance side by side: HELOC vs Cash-Out Refinance
→ Run your equity numbers to see all your options: Check your equity
→ Not sure what move to make? The Strategy Engine will guide you: Find your strategy