The Complete Guide to Paying Off Your Mortgage Early
By Arshi Khan, Founder of Just4Marketing · Last reviewed October 2026
Every extra dollar you put toward your mortgage principal stops earning interest for the lender — and keeps saving you money every month for the rest of the loan. Even small extra payments can take years off a 30-year mortgage. This guide shows how extra payments work, how much they save, and what to check before you start.
How extra payments work
Each regular payment covers that month's interest first, and the rest reduces the balance. Any extra payment goes straight to the balance, so next month's interest is calculated on a smaller amount. That effect repeats every month, which is why the savings grow far larger than the extra payments themselves.
The calculator runs the loan month by month twice — once with your regular payment only and once with your extras — and compares the payoff date and total interest.
What different extra payments save
A $300,000 balance at 6.5% with 30 years left has a regular payment of $1,896.20.
| Extra payment | Paid off in | Time saved | Interest saved |
|---|---|---|---|
| None | 30 years | — | — |
| $100 a month | 26 years | 4 years | About $61,000 |
| $200 a month | 23 yr 1 mo | 6 yr 11 mo | About $103,400 |
| $500 a month | 17 yr 6 mo | 12 yr 6 mo | About $179,800 |
| $10,000 once, now | 27 yr 3 mo | 2 yr 9 mo | About $53,900 |
| $200 a month + $10,000 now | 21 yr 5 mo | 8 yr 7 mo | About $135,700 |
Easy ways to pay extra
Round up your payment
Paying $2,000 instead of $1,896 adds about $100 a month without much thought.
Make one extra payment a year
Paying 1/12 of your payment extra each month, or half your payment every two weeks, adds up to one extra payment a year.
Use windfalls
Tax refunds, bonuses and gifts applied to principal work like a lump sum.
Keep an emergency fund first
Money paid into your mortgage is hard to get back out, so keep a cash buffer before paying extra.
Frequently asked questions
How much do extra mortgage payments save?
On a $300,000 loan at 6.5% over 30 years, paying an extra $200 a month saves about $103,000 in interest and pays the loan off almost 7 years early. The earlier in the loan you start, the more you save, because more of each early payment goes to interest.
Is it better to pay extra monthly or make a lump sum?
Both reduce the principal. A lump sum early in the loan saves the most per dollar because it stops interest on that amount straight away. Regular monthly extras are easier to keep up and, over time, usually add up to more. Many people do both — a set amount each month plus windfalls such as a bonus or tax refund.
Does an extra payment lower my monthly payment?
Usually not. On most fixed-rate mortgages, extra payments shorten the loan rather than lowering the required payment. Some lenders offer a recast — re-calculating the payment after a large lump sum — often for a small fee.
How do I make sure extra money goes to principal?
Tell your lender to apply it to principal. Most online payment portals have a separate 'additional principal' field. Check your next statement to confirm the balance dropped by the full extra amount.
Should I pay off my mortgage early or invest?
Paying extra gives a guaranteed return equal to your mortgage rate. Investing may earn more over time but isn't guaranteed. Many people first clear higher-rate debt, build an emergency fund and capture any employer retirement match, then decide based on their rate and comfort with risk.