Refinance when the math works: lower rate, lower payment, and you’ll stay long enough to break even on closing costs. The old “1% rule” is outdated — even a 0.5-0.75% reduction can save thousands if your balance is large enough.
Quick Decision Calculator
| Current Rate | New Rate | Rate Drop | Monthly Savings ($300K Loan) | Break-Even (est.) |
|---|---|---|---|---|
| 8.0% | 7.0% | 1.0% | $200 | 2-3 years |
| 7.5% | 6.5% | 1.0% | $197 | 2-3 years |
| 7.0% | 6.5% | 0.5% | $98 | 4-5 years |
| 7.0% | 6.0% | 1.0% | $193 | 2-3 years |
| 6.5% | 5.5% | 1.0% | $189 | 2-3 years |
| 5.0% | 4.0% | 1.0% | $171 | 3 years |
Break-even = closing costs ÷ monthly savings. Closing costs assumed at $6,000-$8,000.
Reasons to Refinance
| Reason | When It Makes Sense |
|---|---|
| Lower rate | New rate is 0.75%+ lower and you’ll stay 3+ years |
| Drop PMI | Home value has increased to 80%+ LTV |
| ARM to fixed | Lock in a fixed rate before your ARM adjusts higher |
| Shorten term | 30-year to 15-year: higher payment but save massively on interest |
| Cash-out | Need funds for high-ROI renovation or debt consolidation |
| Remove co-borrower | Divorce or partner separation |
Reasons NOT to Refinance
| Reason | Why |
|---|---|
| Rate drop is less than 0.5% | Savings won’t cover closing costs for years |
| You’re 15+ years into a 30-year mortgage | Most payments are principal now; restarting adds interest |
| Moving within 2-3 years | Won’t break even on closing costs |
| You’d roll closing costs into loan | Increases balance and total interest paid |
| Your credit has dropped significantly | Higher rate than current; not worth it |
| You’d extend from 15-year to 30-year | Lower payment but much more total interest |
Break-Even Analysis
$300,000 loan, refinancing from 7.5% to 6.5%:
| Item | Amount |
|---|---|
| Current monthly payment | $2,098 |
| New monthly payment | $1,896 |
| Monthly savings | $202 |
| Closing costs | $7,500 |
| Break-even point | 37 months (3.1 years) |
If you stay 5+ years: save $4,620 after recouping costs. If you stay 10 years: save $16,740.
Shortening Your Loan Term
| Refinance From | Refinance To | Monthly Change ($300K, 6.5%) | Total Interest Saved |
|---|---|---|---|
| 30-year at 7.0% | 30-year at 6.5% | -$98/month | $35,000 |
| 30-year at 7.0% | 15-year at 6.0% | +$531/month | $190,000 |
| 30-year at 7.0% | 20-year at 6.25% | +$198/month | $130,000 |
Shortening your term increases payments but saves enormous amounts in total interest.
Cash-Out Refinance: When It Makes Sense
| Use of Cash-Out Funds | Good Idea? |
|---|---|
| Home renovation that adds value | ✅ Yes |
| Pay off 20%+ credit card debt | ✅ Probably (if you won’t re-accumulate) |
| Emergency medical expenses | ⚠️ Only if no better option |
| Vacation or lifestyle spending | ❌ No |
| Investing in stocks | ❌ Risky — borrowing against your home to invest |
The Bottom Line
Refinance when the rate drop is at least 0.5-0.75%, you’ll stay past the break-even point, and the monthly savings improve your financial situation. Don’t refinance just because rates dropped slightly, and be cautious about extending your term or doing a cash-out refinance for non-essential purposes.
Related: Can You Refinance with Bad Credit? | Should I Pay Off My Mortgage Early?
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