"Rates dropped — should I refinance?" The old rule of thumb said to refinance when rates fall a full percentage point. That rule is outdated. The real question is simpler: how fast do the monthly savings repay the closing costs?

The breakeven math

Take a $350,000 balance refinanced from 7.25% to 6.00% on a new 30-year term:

| | Old loan | New loan | |---|---|---| | Monthly P&I | $2,388 | $2,098 | | Monthly savings | — | $289 |

With $7,000 in closing costs, breakeven is $7,000 ÷ $289 ≈ 24 months. If you will stay in the home longer than 2 years, refinancing wins. Sell or move before month 24, and you paid $7,000 to lose money.

The breakeven rule: refinance when (monthly savings × months you will stay) comfortably exceeds closing costs. Everything else is commentary.

When refinancing makes sense

  • Rate drop with a short breakeven. Even a 0.5% drop can work if closing costs are low and you are staying put.
  • Dropping PMI. If appreciation pushed you past 20% equity, a refinance (or even just a reappraisal — see how PMI drops off) can kill a $200+/month PMI charge.
  • Switching loan types. Moving from an ARM to a fixed rate before the adjustment period buys certainty. Or refinancing a 30-year into a 15-year — see 30 vs 15-year math.
  • Your credit improved. A score jump from 680 to 760 can unlock meaningfully better pricing on the same market rates.

The traps

  • Resetting the clock. Refinancing a loan you have paid for 8 years into a new 30-year term restarts amortization — early payments are almost all interest again. Ask for a term matching your remaining years, or keep paying the old amount.
  • Cash-out temptation. Rolling credit card debt into the mortgage converts unsecured debt into debt secured by your home, often with closing costs on top. Sometimes it is the least-bad option; usually it papers over a spending problem.
  • The "no-cost" illusion. No-closing-cost refinances exist — the costs are baked into a higher rate instead. Fine if the math still works, but compare honestly.
  • Refinancing serially. Every refinance has costs. Refinancing every 18 months for marginal gains is a treadmill.

Run your numbers

Enter your current balance, rate and the offered terms in our refinance calculator for your exact breakeven month and lifetime savings. Then sanity-check the new payment against what you can afford — a lower rate is not a license for a bigger house.

Estimates for planning only, not financial advice. Closing costs and rates vary by lender, loan size and market.