Early Mortgage Payoff Calculator

The first $150 removes 76 payments. The last $200 — going from $400 to $600 — removes 34. Prepayment has sharply diminishing returns, which is worth knowing before you strain the budget chasing them.

Prepaying a mortgage is a guaranteed, risk-free return equal to your interest rate. At 6.25%, an extra dollar of principal reliably saves 6.25% a year, every year, until the loan ends. No market can promise that.

What it is not is a 6.25% return on a growing balance. The money is gone into an illiquid asset the moment it is paid, and you cannot get it back without selling the house or borrowing against it. The return is real; the liquidity is not.

Your emergency fund is not full. Three to six months of expenses in cash first, always. A paid-down mortgage does not fix a transmission, and borrowing the money back costs more than the interest you saved.

You have higher-rate debt. Credit cards at 22%, personal loans at 12%, car loans above your mortgage rate. Every one of those outranks a 6.25% mortgage, and it is not close.

You are leaving an employer match unclaimed. A 50% match is an immediate 50% return. No mortgage rate competes.

Your mortgage rate is low. Below roughly 4%, a fixed-rate mortgage is cheap long-term money and the case for tying up capital to retire it early weakens considerably. Tax-advantaged investing usually wins on expected value, though not on certainty.

This is the single most common misunderstanding, and it matters most in exactly the situation where the error hurts. Prepaying deletes payments from the end of the loan. It does not reduce the payment you owe in November.

So prepayment is not a hedge against losing your job. If anything it is the opposite: money you cannot reach, in exchange for an obligation that has not shrunk. If the goal is lower monthly cash flow rather than a shorter loan, you want a recast or a refinance, not extra principal.

An early mortgage payment is almost entirely interest, so early prepayment cancels far more compounding than the same dollars later.

On a $400,000 loan at 6.5%, a single $10,000 payment in month 13 saves $51,174 — over five times the amount paid — and ends the loan two years early. The same $10,000 in year twenty saves a small fraction of that. If you are going to do this, the best month to start is this one.

An extra payment only works if the servicer applies it to principal. Send an unlabelled overpayment and a common outcome is that it is held toward next month's payment, which changes nothing.

• Use the portal's dedicated additional principal or curtailment field.
• On a check or bill-pay, write “apply to principal only.”
• Verify on the next statement that the balance fell by your normal principal plus the full extra amount.

Most modern owner-occupied US mortgages have none, and Qualified Mortgages face restrictions on whether and how one may be charged — but it is a loan-level question and the answer is in your note. Read it before committing to a plan. The CFPB explains what a prepayment penalty is (consumerfinance.gov, read September 2026).

If your loan carries private mortgage insurance, early prepayment can be worth considerably more than the interest saving alone, because reaching the loan-to-value threshold lets the insurance be cancelled. On a conventional loan you can generally request cancellation at 80% loan-to-value, and it terminates automatically at 78% under federal rules.

A borrower paying $180 a month in PMI who can reach the threshold two years early captures $4,320 on top of the interest. Target the threshold deliberately rather than treating it as a side effect — the CFPB sets out when PMI can be removed (consumerfinance.gov, read September 2026). Note that FHA loans written since 2013 generally carry mortgage insurance for the life of the loan, and prepayment will not remove it.

When the mortgage is gone, the property taxes and homeowner's insurance are not. Your servicer stops collecting them, and the bills start arriving directly, often annually or semi-annually in amounts large enough to be startling if nothing was set aside.

Budget for this before the final payment, not after it. A monthly transfer into a separate account, sized at what your escrow portion used to be, keeps the habit and the cash flow intact.

An early mortgage payoff calculator is only accurate if you feed it the loan you actually have, so enter your current balance as the loan amount and the term closest to the years actually remaining — not the original loan. Using the original figures on a loan you are six years into will overstate the savings substantially.

Then run three extra amounts rather than one. A single answer tells you what $250 does; three answers tell you the shape of the curve, and the shape is what lets you pick a number you can sustain. Sustainability matters more than optimisation here: a $150 extra payment maintained for twenty years beats a $500 one abandoned in year two, and the calculator will show you exactly how much. Besides the extra monthly amount, it accepts an extra payment once a year (applied every twelfth payment) and a one-time lump sum in whichever payment number you expect a bonus or windfall, so you can test the plan you will actually follow.