Calculate the exact month your monthly interest savings recover upfront closing fees, and evaluate whether refinancing your home loan delivers true net profit.
| Metric | Current Loan | Refinanced |
|---|---|---|
| Monthly P&I | $2,328.63 | $1,987.26 |
| Interest Rate | 7.00% | 5.50% |
| Total Lifetime Interest | $404,475 | $365,414 |
| Closing Costs | $0 | $5,000 |
Mortgage refinancing profitability hinges on mathematical closing-cost amortization. When you refinance, you exchange your existing promissory note for a new mortgage with updated interest rates and term lengths. The monthly Principal and Interest (P&I) payment for both notes is calculated using the standard fixed annuity amortization formula:
Where P is the remaining loan principal, r is the monthly interest rate (annual interest rate ÷ 12), and n is the total number of monthly payments.
Worked Example: Consider an existing mortgage balance of $350,000 with 27 years remaining at 7.00% APR. The current monthly P&I payment is $2,328.63. Refinancing into a brand-new 30-year loan at 5.50% APR yields a new monthly payment of $1,987.26, generating a net monthly cash flow reduction of $341.37. If total lender, appraisal, and title fees equal $5,000:
By Month 15, the homeowner has fully recovered all closing expenses. By Month 60 (5 years), the cumulative net cash savings equal $15,482 ($20,482 saved minus $5,000 closing costs).
* Disclaimer: This calculator is provided for educational and illustrative purposes only and does not constitute mortgage lending, underwriting, legal, or financial advice. Actual loan terms, APR, and closing costs depend on your credit score, loan-to-value ratio, and lender underwriting criteria.
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