Understanding the Mortgage Refinance Break-Even Point
Deciding whether to refinance your mortgage involves more than just looking at a lower interest rate. To determine if a refinance is financially sound, you must calculate the break-even point. This is the moment in time where the monthly savings generated by the lower interest rate exceed the upfront costs of securing the new loan.
How the Break-Even Calculation Works
The math behind refinancing is straightforward but critical. To find your break-even point, we follow these steps:
Calculate Current Payment: Determine your monthly principal and interest payment based on your current balance and rate.
Calculate New Payment: Estimate the new payment using the lower interest rate and current loan balance.
Determine Monthly Savings: Subtract the new payment from the old payment.
Factor in Closing Costs: Refinancing typically costs 2% to 5% of the loan amount in origination fees, appraisals, and title insurance.
The Formula: Divide the Total Closing Costs by the Monthly Savings.
Refinance Example
Imagine you have a $300,000 balance on a mortgage with a 6.5% interest rate. Your monthly principal and interest payment is approximately $2,025. If you refinance to a 5.5% rate, your new payment drops to $1,842.
Monthly Savings: $183
Closing Costs: $5,000
Break-Even: $5,000 / $183 = 27.3 Months
In this scenario, if you plan to stay in the home for longer than 28 months, refinancing is a winning financial move. If you plan to sell the home in two years, the refinance would actually cost you money.
When Does Refinancing Make Sense?
Generally, experts suggest refinancing is worth considering if you can lower your interest rate by at least 0.75% to 1%. However, the break-even period is the ultimate metric. If your break-even point is under 36 months and you intend to keep the property long-term, you will maximize your net worth by reducing long-term interest expense.
function calculateRefinance() {
var balance = parseFloat(document.getElementById('loanBalance').value);
var oldRate = parseFloat(document.getElementById('currentRate').value) / 100 / 12;
var newRate = parseFloat(document.getElementById('newRate').value) / 100 / 12;
var termMonths = parseFloat(document.getElementById('loanTerm').value) * 12;
var costs = parseFloat(document.getElementById('closingCosts').value);
if (isNaN(balance) || isNaN(oldRate) || isNaN(newRate) || isNaN(termMonths) || isNaN(costs)) {
alert("Please enter valid numerical values.");
return;
}
// Payment Formula: P * [ r(1+r)^n ] / [ (1+r)^n – 1 ]
var paymentOld = balance * (oldRate * Math.pow(1 + oldRate, termMonths)) / (Math.pow(1 + oldRate, termMonths) – 1);
var paymentNew = balance * (newRate * Math.pow(1 + newRate, termMonths)) / (Math.pow(1 + newRate, termMonths) – 1);
var savings = paymentOld – paymentNew;
if (savings <= 0) {
document.getElementById('results').style.display = "block";
document.getElementById('results').innerHTML = "
No Savings Detected
Your new rate must be lower than your current rate to generate monthly savings. A refinance may not be beneficial in this scenario.";
return;
}
var breakEvenMonths = costs / savings;
var breakEvenYears = breakEvenMonths / 12;
document.getElementById('oldPayment').innerText = "$" + paymentOld.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('newPayment').innerText = "$" + paymentNew.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('monthlySavings').innerText = "$" + savings.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('breakEvenMonths').innerText = Math.ceil(breakEvenMonths);
document.getElementById('breakEvenYears').innerText = breakEvenYears.toFixed(1);
document.getElementById('results').style.display = "block";
}