Decision context
Compare the term reset with the rate change
A refinance can lower a payment for several reasons. This page puts those reasons on the same comparison instead of treating a lower payment as automatic savings.
The break-even figure is a simple timing estimate. Compare it with how long you expect to keep the new loan and with total repayment.
A new loan is a new transaction
Refinancing generally replaces an existing obligation with a new one, including new disclosures and terms.
Costs can be visible or financed
Closing costs paid upfront and costs added to principal both matter, but they affect cash flow and interest differently.
Illustrative scenario
A homeowner sees a lower rate but a new 30-year term. The calculator shows a lower payment; then the homeowner compares total interest and expected time in the home before deciding whether to seek disclosures.
What this calculator does
It estimates old and new payment paths, modeled interest, total cost, and an optional cash-cost break-even point. It separates costs paid in cash from costs financed into the new balance before lender disclosures, qualification rules, and tax effects are known.
When to use it
Use it when a lender advertises a lower rate, when considering a term change, or when deciding whether monthly savings may justify refinancing costs.
Inputs explained
- Current balance: the remaining loan balance being compared with a new refinance option.
- Current rate: the interest rate on the existing loan.
- Current term: the remaining repayment period on the existing loan.
- New rate: the interest rate assumption for the new refinanced loan.
- New term: the repayment period for the new refinanced loan.
- Closing costs: upfront refinance costs included in the break-even comparison.
- Closing-cost treatment: whether refinance closing costs are paid in cash or added to the new loan balance in the model.
Formula or method
The model calculates fixed payments for the existing and proposed balances. Cash closing costs are divided by modeled monthly payment reduction for a simple break-even estimate; financed costs are added to the proposed balance and therefore remain part of the new loan's modeled interest.
Worked example
A lower payment can come from a lower rate, a longer term, or both. Compare the remaining payoff period and total modeled interest before treating monthly savings as a net benefit.
How to interpret the result
Break-even is not guaranteed. A move, prepayment, cash-out balance, financed fees, changing rate, mortgage insurance, taxes, and lender conditions can make the actual comparison different.
Practical checks before using the result
- Use the current payoff balance and remaining term, not the original loan amount and original term.
- Separate costs paid in cash from costs rolled into the new balance because only cash costs have the simple payment-savings break-even shown here.
Common mistakes
- Refinancing solely to reduce a payment while resetting the term and increasing total interest.
- Ignoring how long the borrower expects to keep the loan.
Limitations and disclaimers
These results are general estimates only and are not financial, tax, or legal advice. They do not include live lender, payroll, tax-authority, market, contract, fee, insurance, or jurisdiction-specific data.
Related calculator context
Use Mortgage Calculator for a new purchase scenario and Amortization Calculator to inspect the remaining balance path before refinancing.
Related glossary terms
These plain-English definitions can help you check the terms used in this calculator before relying on the result.
Frequently Asked Questions
Why is a lower refinance payment not automatically a saving?
Refinancing generally replaces an existing obligation with a new one, including new disclosures and terms. Break-even is not guaranteed. A move, prepayment, cash-out balance, financed fees, changing rate, mortgage insurance, taxes, and lender conditions can make the actual comparison different.
How do cash-paid and financed closing costs differ?
Use the current payoff balance and remaining term, not the original loan amount and original term. Separate costs paid in cash from costs rolled into the new balance because only cash costs have the simple payment-savings break-even shown here.
Which refinance terms are outside this break-even estimate?
These results are general estimates only and are not financial, tax, or legal advice. They do not include live lender, payroll, tax-authority, market, contract, fee, insurance, or jurisdiction-specific data.