🏠 Mortgage Payoff Calculator With Extra Payments

On a $300,000 mortgage at 6.8% over 30 years, the monthly payment for principal and interest is about $1,956. Adding $200 a month, paying about $2,156, moves your payoff from 30 years to roughly 23 years. That is about 7 years sooner, and it saves around $111,000 in interest. The savings are this large because each early payment lowers the balance that interest is figured on, so less interest builds up for the rest of the loan. Run your own balance, rate, and term in the calculator above to see your exact numbers.

On a standard mortgage, your regular payment first covers the interest owed since your last payment, and the rest lowers the balance. A mortgage is front-loaded with interest: on a $300,000 loan at 6.8%, about $1,700 of your first $1,956 payment is interest. An extra payment marked "principal only" skips the interest step and goes straight to lowering your balance, which is why it has such a big effect on your payoff date. It only works this way if you tell your servicer to apply the extra money to principal, otherwise some servicers hold it as your next payment instead.

The most reliable way is to make a separate payment, not combined with your regular payment, and mark it "principal only," either in a check memo or with your servicer's online principal-only option. Then check your next statement to confirm the balance dropped by the full extra amount, not just by the normal schedule. If the statement shows your extra money was applied to next month's payment instead of principal, call your servicer and ask them to correct it. This is a common default that quietly costs homeowners money.

Paying extra every month usually saves a bit more than one lump sum a year, because you lower the balance earlier, so less interest builds up in the months in between. The difference is small, though. On a $300,000 mortgage at 6.8%, one extra full payment a year (about $163 a month set aside) pays the loan off about 6 years sooner and saves roughly $96,000. If your money is lumpy, a bonus, a tax refund, or commission, a once-a-year extra payment is still very effective. Pick the schedule you can actually keep.

For most homeowners, no. Prepayment penalties are rare on modern mortgages, and federal rules limit them on many home loans, so extra payments usually cost you nothing beyond the payment itself. Still, it is worth confirming before you start: check your loan documents for a "prepayment" section, or call your servicer and ask directly. If your loan has no penalty, you are free to pay extra toward principal whenever you like and shorten your payoff. This is about your payoff math, it is not advice to refinance or change your loan.

On a $300,000 mortgage at 6.8% over 30 years, adding $100 a month to the roughly $1,956 payment moves your payoff from 30 years to about 26 years, around 4 years sooner, and saves roughly $66,000 in interest. The bigger your balance and rate, the more each extra dollar does, because there is more interest to remove. Even a small, steady extra amount adds up over the life of a home loan. Use the calculator above with your own balance, rate, and term to see your exact month and interest savings.

There is no single right answer, so weigh a few things. Paying down a 6.8% mortgage early is like earning a guaranteed 6.8% return with no risk, while investing the same money might earn more over time but can also lose value. Before paying extra on the mortgage, most people first build an emergency fund and capture any full employer 401(k) match, since those come first. After that it comes down to math and how much a paid-off home is worth to you personally. This is general information, not financial advice, run your own numbers in the calculator above to see the guaranteed interest savings from paying early.

Yes, and here is why. Biweekly means you pay half your monthly amount every two weeks, which adds up to 26 half-payments, 13 full payments, a year instead of 12, so you make one extra payment every year without really feeling it. On a $300,000 mortgage at 6.8%, that one extra payment a year pays the loan off about 6 years sooner and saves roughly $96,164 in interest. You can get the exact same result by adding one-twelfth of your payment to each monthly payment. Just confirm your servicer applies the extra straight to principal and does not charge a biweekly setup fee.

To cut a 30-year mortgage in half, you raise your monthly payment enough to reach a 15-year payoff. On a $300,000 loan at 6.8%, the 30-year payment is about $1,956, and a 15-year payoff needs about $2,663, roughly $707 more each month. In return you save about $224,730 in interest, because the balance falls far faster. If the full amount is too much, even a smaller steady extra payment still moves your payoff date up. Enter your balance, rate, and target date in the calculator above to see the exact extra payment you need.