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Mortgage Payoff Calculator
Calculate how much time and interest you can save by making extra monthly payments.
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How This Mortgage Payoff Calculator Works
Paying off your mortgage early is one of the most effective ways to build wealth and reduce financial stress. This calculator determines the impact of adding extra principal payments to your monthly mortgage bill. By applying extra funds directly to the principal balance, you reduce the amount of interest that accrues every month, leading to a compounding effect of savings.
The Math Behind Early Payoff
Mortgages are amortized, meaning that in the early years of your loan, most of your payment goes toward interest rather than the principal balance. When you make an extra payment:
- 100% goes to Principal: Unlike your regular payment, extra payments skip the interest portion and reduce the debt immediately.
- Interest Recalculation: Next month, the interest is calculated on a smaller balance, meaning more of your regular payment goes to principal.
- Reduced Duration: Because the balance hits zero faster, you eliminate the high-interest months at the end of the original schedule.
Strategic Examples of Extra Payments
Consider a $300,000 mortgage at 6.5% interest for 30 years. Your standard principal and interest payment would be roughly $1,896.20.
- Adding $100/month: You would save approximately $53,000 in interest and pay off the loan 3 years and 4 months early.
- Adding $500/month: You would save over $165,000 in interest and shave nearly 11 years off your mortgage.
Frequently Asked Questions
Should I pay off my mortgage or invest?
This depends on your mortgage interest rate and your risk tolerance. If your mortgage rate is 7%, paying it off is equivalent to a guaranteed 7% return on your money. If you can earn 10% in the stock market, investing might seem better, but mortgage payoff provides a “guaranteed” return without market volatility.
Are there penalties for paying off a mortgage early?
Most modern residential mortgages in the U.S. do not have prepayment penalties. However, always check your specific loan disclosure (Closing Disclosure) or contact your servicer to ensure you won’t be charged for paying ahead.
Does the extra payment have to be monthly?
No. You can make lump-sum payments annually (like using a tax refund) or increase your monthly amount. This calculator focuses on consistent monthly additions, which is the most common habit for early payoff.
function calculateMortgagePayoff() {
var balance = parseFloat(document.getElementById(“loanBalance”).value);
var annualRate = parseFloat(document.getElementById(“interestRate”).value);
var years = parseFloat(document.getElementById(“remainingYears”).value);
var extra = parseFloat(document.getElementById(“extraPayment”).value) || 0;
if (isNaN(balance) || isNaN(annualRate) || isNaN(years) || balance <= 0) {
alert("Please enter valid positive numbers for balance, rate, and years.");
return;
}
var monthlyRate = annualRate / 100 / 12;
var totalMonths = years * 12;
// Calculate Standard Monthly Payment (P & I)
var standardPayment = balance * (monthlyRate * Math.pow(1 + monthlyRate, totalMonths)) / (Math.pow(1 + monthlyRate, totalMonths) – 1);
// 1. Calculate Original Path
var originalTotalInterest = 0;
var tempBalanceOrig = balance;
for (var i = 0; i 0 && monthsToPayoff tempBalanceNew) {
tempBalanceNew = 0;
} else {
tempBalanceNew -= availableForPrincipal;
}
monthsToPayoff++;
}
// 3. Results Logic
var interestSaved = originalTotalInterest – newTotalInterest;
var timeSavedMonths = totalMonths – monthsToPayoff;
var timeSavedStr = “”;
if (timeSavedMonths >= 12) {
var ySaved = Math.floor(timeSavedMonths / 12);
var mSaved = timeSavedMonths % 12;
timeSavedStr = ySaved + ” years, ” + mSaved + ” months”;
} else {
timeSavedStr = timeSavedMonths + ” months”;
}
// Formatting
var formatter = new Intl.NumberFormat(‘en-US’, {
style: ‘currency’,
currency: ‘USD’,
});
document.getElementById(“standardMonthly”).innerText = formatter.format(standardPayment);
document.getElementById(“originalInterest”).innerText = formatter.format(originalTotalInterest);
document.getElementById(“newInterest”).innerText = formatter.format(newTotalInterest);
document.getElementById(“interestSaved”).innerText = formatter.format(interestSaved);
document.getElementById(“timeSaved”).innerText = timeSavedStr;
document.getElementById(“mortgageResults”).style.display = “block”;
}