Refinance vs. purchase — which option makes more sense?

Updated April 2026.

Two different decisions, often confused. Refinancing replaces your existing mortgage with a new one — same house, new terms. Purchasing means selling your current home and buying a different one — new house, new mortgage. The math, the timing, and the lock-in effects are completely different.

To run the actual numbers on a specific refi scenario — break-even month, lifetime savings, term-reset cost — use the refinance calculator. The math here applies on top of whatever it tells you about closing costs vs monthly savings; the rate-and-term math is one input into the broader refinance-vs-sell decision. For the closer question of refinance vs. prepay (when staying in the same house), that's a separate decision tree.

When refinancing makes sense

Refinancing is usually worth running the numbers on when you want to keep the house and the neighborhood, but the financial terms have changed enough to potentially justify the closing costs. The common reasons people refinance:

Rate dropped meaningfully.A common rule of thumb is roughly 0.75 percentage points or more, and that you'll stay in the home long enough to break even on closing costs¹.
You hit 20% equity on an FHA loan.Refinancing into a conventional loan to drop FHA's lifetime mortgage insurance premium (MIP) can save meaningful money each year — the savings depend on your loan size and rate, but the math is often clear-cut².
Your credit score has improved 50+ points.Even if rates haven't moved, a better score can unlock a meaningfully better rate.
You need cash for renovations or another investment — a cash-out refi (rate ~0.25-0.5% higher than rate-and-term) can extract equity at lower rates than a personal loan or HELOC. Worth running the HELOC scenario through the HELOC payoff calculator first — a variable-rate draw period isn't always cheaper once the repayment phase kicks in.
You want to shorten the term. Refinancing a 30-year into a 15-year often nets a 0.5-0.75% lower rate, and forces faster payoff.

Of the five reasons above, the rate drop and the FHA-MIP escape are the two that consistently produce real savings net of closing costs. The other three — credit-score improvement, cash-out, term-shortening — can pencil out, but the math turns on inputs that vary widely loan to loan. If you're refinancing for any of the bottom three, double-check the total cost against the calculator before signing.

Run the refinance calculator with your numbers →

Or use the break-even calculator → to see exactly how many months until savings cover closing costs, plus whether the refi shape is a strict win or a term-extension trap.

When selling and buying makes sense

Selling and buying a different home is usually the right call when the home itself no longer fits your life — not when you just want better mortgage terms. The transaction introduces costs refinancing doesn't: realtor commissions (historically around 5-6% of sale price, though increasingly negotiable since the 2024 NAR settlement), moving costs, capital gains tax above the $250k single / $500k married primary-residence exclusion³, and the rate-lock-in cost if your current mortgage is meaningfully below market.

Reasons people decide to move anyway:

Family/space change.Marriage, kids, eldercare, divorce — life-stage changes where the current home physically doesn't work.
Geographic change.Job relocation, climate preference, school district. Refinancing doesn't move you.
Significant equity windfall. If your home has appreciated a lot and the gains exceed the rate-lock cost, cashing out via sale and buying smaller can free up capital.
Lifestyle downsize for retirement. Trading down to a smaller home, often in a different state, where the equity extracted improves retirement cash flow.

The rate lock-in effect (what most calculators ignore)

If you bought before 2022 with a sub-4% mortgage and current rates are 7%, selling and buying a new home effectively costs you the rate spread for the life of the new loan. On a $500k mortgage, that's roughly $1,000/month higher payment forever. That cost isn't a one-time closing fee — it compounds over years.

This is part of why the U.S. resale market has been thin since 2022 — homeowners with low rates have a strong financial disincentive to move, even when the home no longer fits their life. Federal housing researchers have documented this dynamic explicitly⁴. If you're in this position, run both scenarios: (a) refinance + stay vs (b) sell + buy + new mortgage at current rates. The math usually favors staying — sometimes by a lot.

How to think through it

Does the house and location still fit your life? If yes, refinance is your tool. If no, purchase is your tool.
If refinance: do the math — closing costs ÷ monthly savings = break-even. If you'll stay longer, refi.
If purchase: do the math including rate-lock cost. If the life-fit benefit exceeds the long-term financial cost, sell. If not, find another way to make the current house work.

FAQ

Are refinance rates and purchase rates the same?

Almost — but not quite. Cash-out refinance rates are usually 0.25-0.5 percentage points higher than purchase rates. Standard rate-and-term refinance rates are typically within 0.1% of purchase rates. The lender risk profile is different (cash-out refi extracts equity), so cash-out is priced higher.

Why would I sell instead of refinance if I love my house?

Three reasons it can make sense: (1) you've outgrown the home and need more space, (2) the location no longer fits your life (job change, family change), (3) market conditions have given you significant home equity that funds a much better next home. If none of those apply and you just want a lower payment, refinancing almost always beats selling.

Does the rate-lock-in effect change the math?

Yes, significantly. If you bought before 2022 with a 3% mortgage and current rates are 7%, selling means you give up that low rate forever. The 'cost' of moving is the difference in your future monthly payment on the new home — often $1,000+ per month — for the life of the new loan. Many people stay in homes that no longer fit their life because of this lock-in.

Can I do both — refinance and then sell?

You can, but it's usually not a good idea unless you'll stay long enough to break even on the refi closing costs. Refinancing 6 months before selling means the closing costs (~$8-15k) come out of your sale proceeds with no rate-savings benefit.

Where this leads

Once you've decided refinancing beats selling, the closer question is whether to refinance or just send extra at principal — covered in new loan or extra payments?
For the math on a specific refi quote, run it through the refinance calculator and check how long until the refinance pays for itself.
If you're sitting on an FHA loan and the rate has dropped, the refinance exit that drops lifetime MIP is in the FHA loan guide.

Sources

1. Consumer Financial Protection Bureau, Refinancing your mortgage: when it makes sense — break-even framing. ↩
2. HUD, FHA 203(b) program details — including MIP rules. ↩
3. IRS, Publication 523, Selling Your Home — primary-residence capital-gains exclusion. ↩
4. Federal Housing Finance Agency, Working Paper 24-07: The Mortgage Rate Lock-In Effect. ↩

Written by James L. Wu. The refinance-vs-sell decision has bigger dollar consequences than almost anything else most homeowners ever decide; please run the math on your specific loan and talk to a licensed mortgage advisor before doing either. Read the editorial policy for sources.