Early Mortgage Payoff
For a mortgage you already have. It answers the question from either direction: if I pay more, when am I done — or if I want to be done by then, what do I need to pay.
Two modes
The calculator has a Duration mode and a Payment mode, and which one you want depends on which side of the question you're standing on.
Duration mode
You supply the payment; it tells you the timeline.
Inputs:
- ›Loan Amount — the original loan
- ›Amount Still Owed — your current balance
- ›Interest Rate
- ›Loan Term (Years) — the original term
- ›Remaining Term (Years) — what's left on the current schedule
- ›Additional Payment — what you'd add each month
Use this when you have a specific amount of spare money and want to know what it buys you.
Payment mode
You supply the target date; it tells you the payment.
Inputs are similar, but instead of an additional payment you give a Desired Term (Years) — how long you want to take — and it returns the Monthly Payment required.
Use this when the goal is fixed. Paying it off before retirement, before a child starts university, before you plan to move.
Why extra payments do so much here
Early in a mortgage, most of each payment is interest. Anything extra goes entirely against principal — and principal is what all future interest is calculated on.
So an extra payment doesn't just remove itself from the balance. It removes every future interest charge that balance would have generated. On a thirty-year loan the effect compounds hard, and modest extra payments routinely cut years off the term.
The effect is strongest early. The same extra payment made in year two is worth far more than in year twenty.
Whether you should
Running the numbers is the easy part. The judgment is harder, and this calculator can't make it for you.
Pay the mortgage down early when it's your only significant debt, you have an emergency fund, and the certainty is worth something to you.
Do something else first when you're carrying higher-interest debt. A mortgage is typically among the cheapest money you'll ever borrow. Credit card debt at 22% should be cleared long before you accelerate a mortgage at 6% — the arithmetic isn't close.
Be careful about putting every spare dollar into the house. Money in a mortgage is hard to get back out. An emergency fund you can actually reach is worth more than a slightly earlier payoff date.
Check it against your plan
If you're carrying other debts, build them into the Budget Builder and look at what it recommends. The algorithm sequences across everything you owe, and it may well put the mortgage last.
For a single-debt comparison, the Debt Payoff Calculator will show you the same extra payment applied elsewhere.
Note
This calculator doesn't have an Add To Budget button — a mortgage belongs in Housing rather than as a new debt. Enter the revised payment there and rebuild.