Determine how long it will take to recover your closing costs.
Time to Break Even:— Months
(approx — years)
Current Monthly Payment (P&I):$0.00
New Monthly Payment (P&I):$0.00
Monthly Savings:$0.00
Lifetime Net Savings:$0.00
function calculateBreakeven() {
// 1. Get Elements
var currentBalanceInput = document.getElementById("currentBalance");
var currentRateInput = document.getElementById("currentRate");
var newRateInput = document.getElementById("newRate");
var newTermInput = document.getElementById("newTerm");
var closingCostsInput = document.getElementById("closingCosts");
var resultContainer = document.getElementById("resultContainer");
var errorDisplay = document.getElementById("errorDisplay");
// 2. Parse Values
var balance = parseFloat(currentBalanceInput.value);
var currentRate = parseFloat(currentRateInput.value);
var newRate = parseFloat(newRateInput.value);
var newTermYears = parseFloat(newTermInput.value);
var closingCosts = parseFloat(closingCostsInput.value);
// 3. Validation
if (isNaN(balance) || isNaN(currentRate) || isNaN(newRate) || isNaN(newTermYears) || isNaN(closingCosts)) {
errorDisplay.style.display = "block";
errorDisplay.innerText = "Please fill in all fields with valid numbers.";
resultContainer.style.display = "none";
return;
}
if (balance <= 0 || newTermYears <= 0) {
errorDisplay.style.display = "block";
errorDisplay.innerText = "Loan balance and term must be greater than zero.";
resultContainer.style.display = "none";
return;
}
errorDisplay.style.display = "none";
// 4. Calculations
// Convert annual rates to monthly decimals
var monthlyRateOld = (currentRate / 100) / 12;
var monthlyRateNew = (newRate / 100) / 12;
var totalMonthsNew = newTermYears * 12;
// Calculate Old Payment (Estimation based on current balance as principal reset)
// Note: For a true refinance comparison, we compare the payment needed to service the *current balance*
// at the old rate vs the new rate, assuming the user would otherwise keep the loan.
// However, we don't know the *remaining* term of the old loan, so we usually compare
// the cash flow difference. Standard practice for simple calculators is to assume
// the old payment is based on re-amortizing the current balance over the SAME new term
// OR simply asking for the old payment amount.
// To keep this calculator robust without asking for "Original Loan Amount" and "Start Date",
// we will calculate the payment required to pay off the *current balance* at the *old rate*
// over the *new term* OR assume a standard remaining term (e.g. 30 years).
// BETTER APPROACH FOR ACCURACY: Calculate interest-only savings?
// STANDARD APPROACH: Calculate amortized payment of Balance at Old Rate vs Balance at New Rate over New Term.
// Why? Because refinancing resets the clock.
var oldPayment = 0;
if (monthlyRateOld === 0) {
oldPayment = balance / totalMonthsNew;
} else {
oldPayment = balance * (monthlyRateOld * Math.pow(1 + monthlyRateOld, totalMonthsNew)) / (Math.pow(1 + monthlyRateOld, totalMonthsNew) – 1);
}
var newPayment = 0;
// Refinance amount usually includes closing costs if rolled in, but here we treat costs as out of pocket
// to calculate true breakeven on the cost itself.
if (monthlyRateNew === 0) {
newPayment = balance / totalMonthsNew;
} else {
newPayment = balance * (monthlyRateNew * Math.pow(1 + monthlyRateNew, totalMonthsNew)) / (Math.pow(1 + monthlyRateNew, totalMonthsNew) – 1);
}
var monthlySavings = oldPayment – newPayment;
// 5. Breakeven Logic
var breakevenMonths = 0;
var isProfitable = true;
if (monthlySavings 0 ? "#27ae60" : "#e74c3c";
}
Understanding the Mortgage Refinance Breakeven Point
Deciding to refinance your mortgage is a significant financial move that hinges on one critical metric: the breakeven point. While lower interest rates are attractive, the upfront costs associated with securing a new loan can sometimes outweigh the monthly savings. This guide explains how to use our calculator to make an informed decision.
What is the Refinance Breakeven Point?
The breakeven point is the moment in time when the accumulated monthly savings from your new, lower interest rate equal the total costs you paid to close the new loan. Once you pass this point, every month you stay in the home represents pure profit in terms of interest savings.
For example, if your refinance costs $4,000 in closing fees and you save $200 per month:
$4,000 (Cost) รท $200 (Savings) = 20 Months.
In this scenario, it takes 20 months to "break even." If you plan to sell the home or refinance again in 12 months, you would actually lose money on the deal.
Key Inputs for the Calculator
To get the most accurate result from the Mortgage Refinance Breakeven Calculator above, ensure you have the following details:
Current Loan Balance: The exact principal amount remaining on your mortgage today, not the original loan amount.
Current vs. New Interest Rate: Even a difference of 0.5% can result in significant savings on large balances.
Closing Costs: These include appraisal fees, origination fees, title insurance, and application fees. On average, these range from 2% to 5% of the loan amount.
When Should You Refinance?
Financial experts generally suggest refinancing if:
You plan to stay in the home significantly longer than the breakeven period.
You can lower your interest rate by at least 0.75% to 1%.
You want to switch from an adjustable-rate mortgage (ARM) to a fixed-rate mortgage for stability.
Conversely, if you are nearing the end of your loan term, refinancing into a new 30-year term might lower your payments but drastically increase the total interest paid over the life of the loan.
Hidden Factors to Consider
While the math is straightforward, consider your long-term goals. Extending your loan term (e.g., refinancing a mortgage with 20 years left into a new 30-year loan) will lower monthly payments but may cost you more in the long run. Use the "Lifetime Net Savings" metric in our calculator to see the total financial impact.