When refinancing actually saves money
The break-even formula: closing costs ÷ monthly savings = months to break even. If you'll keep the loan past that horizon, refinancing wins. If not, the closing costs erase the gain.
On a mortgage, a 1% rate drop typically pays back closing costs in 24–36 months. On a student loan or auto loan, breakeven happens faster, often within 12 months, because closing costs are lower or zero.
Mortgage refinancing
Rate-and-term refi: lower the rate, keep the term roughly the same. The cleanest case, pure interest savings.
Cash-out refi: borrow against home equity. Useful for high-rate debt consolidation; dangerous for discretionary spending. Adds collateral risk to debt that previously had none.
Streamline refi (FHA, VA): no appraisal, simplified paperwork, lower closing costs. Worthwhile even for small rate drops.
Student loan refinancing
Federal → private refi cuts the rate but permanently gives up income-driven repayment plans, deferment options, and Public Service Loan Forgiveness eligibility. Almost never the right move for borrowers in public-sector or non-profit work.
Private → private refi can drop rates by 2–4% for borrowers with strong credit and high income. Lenders to compare: SoFi, Earnest, Splash Financial, Laurel Road.
Auto loan refinancing
Most beneficial in two scenarios: (1) credit improved significantly since the original loan, (2) original loan was via a dealer marking up the rate. Credit-union refis routinely save $30–$80/month.
Watch the term, extending a 48-month loan to 72 months lowers the payment but increases lifetime interest. Refinance to lower rate, not longer term.
When to NOT refinance
- Closing costs exceed the projected savings over your remaining ownership window.
- You're refinancing to lower the monthly payment by extending the term, usually a sign of cash-flow stress, not a smart move.
- Rates have risen since origination, wait for a future drop.
- You'll move or sell within 18 months and the closing costs won't pay back.
What to compare beyond rate
- APR (which includes fees), not just the headline rate.
- Origination fee, appraisal fee, title insurance, prepayment penalties.
- Term length, keep roughly the same to avoid hidden cost from reset.
- Lender reputation for servicing, bad servicers create payment problems even with great rates.
The mechanics
- Pull current loan terms, rate, balance, monthly payment, payoff amount, prepayment penalty.
- Get rate quotes from 3–4 lenders within a 14-day window (only one credit-score impact for rate shopping).
- Calculate breakeven for each offer.
- Pick the lowest APR that passes the breakeven test for your timeline.
- Close, then verify the old loan was paid in full and shows $0 balance on credit reports.
