Mortgage refinancing โ€” replacing your current loan with a new one at a lower rate โ€” can reduce your monthly payment by $100โ€“$500 and save $30,000โ€“$100,000 in total interest over the life of the loan. The calculation is straightforward; the decision is not always obvious.

The Break-Even Calculation

Refinancing costs money upfront (closing costs: 2โ€“5% of loan amount, typically $4,000โ€“$8,000). To know if it’s worth it: divide closing costs by monthly savings. Example: $6,000 closing costs รท $250/month savings = 24 months to break even. If you’ll stay in the home more than 24 months, refinancing makes sense.

When to Refinance

Rates dropped 0.75โ€“1% or more since your last loan. Your credit score improved significantly (720+ qualifies for best rates). You want to switch from 30-year to 15-year to pay off faster. You want to tap equity (cash-out refinance) for renovations or debt consolidation. You’re eliminating PMI (private mortgage insurance) by reaching 20% equity.

How to Get the Best Rate

Check rates from at least 3โ€“5 lenders. Use a mortgage broker who shops multiple lenders on your behalf. Improve your credit score before applying (pay down credit cards, don’t open new accounts for 6 months). Consider points (paying upfront to lower your rate) if you plan to stay long-term.

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15-Year vs. 30-Year on Refinance
Earn: $100K+ difference
If you have 20 years left on a 30-year mortgage and refinance into a 15-year loan at a lower rate, you could save $50,000โ€“$150,000 in total interest and build equity faster. Run the numbers with any mortgage calculator โ€” the savings are often stunning.