When refinancing makes sense
Key takeaways
04 · ideas- Break-even = closing costs ÷ monthly savings
- A 1% rate drop on $300k saves ~$40,000 total
- Cash-out refinancing resets your loan — usually hurts long-term
- Short remaining term = almost never worth refinancing
Basic level
The essentials · 1 min
Refinancing means replacing your current mortgage with a new one — usually to get a lower interest rate, change the loan term, or access your home equity.
The core question is always the same: how long until the monthly savings repay the upfront costs?
This is your break-even point — the number of months until you're ahead:
Example: $5,000 in closing costs, new payment is $200/month lower → break-even is 25 months. If you'll stay in the home more than 25 months → refinance makes sense.
General rule: A rate reduction of at least 0.5–1% is typically needed to make refinancing worthwhile, depending on remaining loan size.
Intermediate level
How it applies · 2 min
What counts as closing costs
Refinancing costs 2–5% of the loan amount:- Loan origination fee: 0.5–1%
- Appraisal: $300–$600
- Title search and insurance: $500–$1,000
- Attorney fees (where required): $500–$1,500
- Credit report, recording fees: $100–$500
No-closing-cost refinancing: Some lenders offer this, but they recoup costs through a slightly higher rate (typically 0.125–0.25% higher). Do the math — sometimes it's worth it for short remaining time horizons.
When refinancing almost always makes sense
- Rates drop 1%+ and you have 10+ years remaining — the savings are large and the time horizon long enough
- You're converting from ARM to fixed — eliminates rate risk, especially valuable as rates rise
- You're shortening the term — refinancing a 30-year to 15-year at a lower rate can save enormous amounts in total interest
- You're eliminating PMI — if your home has appreciated to >20% equity, refinancing removes PMI even if the rate doesn't change much
When refinancing almost never makes sense
- Short remaining term — if you have 5 years left, you're mostly paying principal anyway. The interest savings are minimal.
- Planning to sell soon — won't stay past break-even
- Cash-out refinancing for consumption — taking equity to buy a car or vacation resets your loan and costs more long-term
- Break-even > 5 years — too uncertain
Advanced level
The math, step by step · 2 min
The full refinance analysis
Let P_0 = current balance, r_0 = current rate, n_0 = remaining months, r_1 = new rate, n_1 = new term, C = closing costs.
Current monthly payment:Break-even: t^* = C / (M_0 - M_1)
Net present value of refinancing at discount rate d:
Refinance if NPV > 0 given your expected tenure.
Extending the term problem: Refinancing $280,000 at 25 remaining years at 8% → new 30-year loan at 7%:- Monthly savings: ~$150/month
- But 5 extra years of payments
- Extra payments over 5 years: $M_1 \times 60 \approx \$108,000$
- This nearly always overwhelms the rate savings for loans with < 15 years remaining
True comparison: Compare total remaining cost (all future payments in present value terms) not just monthly payment.