Extra principal is the cheapest return most homeowners can find: paying down a 6.5% mortgage saves interest at 6.5%, tax-free, with no market risk. The catch is that the benefit is invisible on a monthly statement, because the reward arrives years later as a shorter loan.
Time saved
6 years
Paying $200.00 extra each month clears the loan in Aug 2048 instead of Aug 2054.
| Year | Balance without extra | Balance with extra | Interest saved that year |
|---|---|---|---|
| Year 1 | $296,092 | $293,620 | $73 |
| Year 2 | $291,923 | $286,812 | $238 |
| Year 3 | $287,474 | $279,548 | $415 |
| Year 4 | $282,728 | $271,798 | $604 |
| Year 5 | $277,664 | $263,529 | $805 |
| Year 6 | $272,260 | $254,706 | $1,019 |
| Year 7 | $266,495 | $245,292 | $1,248 |
| Year 8 | $260,343 | $235,248 | $1,493 |
| Year 9 | $253,780 | $224,531 | $1,754 |
| Year 10 | $246,776 | $213,096 | $2,032 |
| Year 11 | $239,304 | $200,895 | $2,328 |
| Year 12 | $231,332 | $187,878 | $2,645 |
| Year 13 | $222,825 | $173,988 | $2,983 |
| Year 14 | $213,749 | $159,168 | $3,344 |
| Year 15 | $204,065 | $143,356 | $3,728 |
| Year 16 | $193,733 | $126,485 | $4,139 |
| Year 17 | $182,708 | $108,484 | $4,577 |
| Year 18 | $170,945 | $89,277 | $5,044 |
| Year 19 | $158,395 | $68,785 | $5,542 |
| Year 20 | $145,003 | $46,919 | $6,074 |
| Year 21 | $130,715 | $23,589 | $6,642 |
| Year 22 | $115,470 | $0 | $7,247 |
| Year 23 | $99,204 | $0.00 | $7,027 |
| Year 24 | $81,849 | $0.00 | $5,937 |
| Year 25 | $63,332 | $0.00 | $4,775 |
| Year 26 | $43,574 | $0.00 | $3,535 |
| Year 27 | $22,493 | $0.00 | $2,212 |
| Year 28 | $0 | $0.00 | $800 |
| Year | Balance without extra | Balance with extra | Interest saved that year | ||
|---|---|---|---|---|---|
| 1 | Sep 2026 | $2,141.05 | $1,625.00 | $316.05 | $299,483.95 |
| 2 | Oct 2026 | $2,141.05 | $1,622.20 | $318.84 | $298,965.11 |
| 3 | Nov 2026 | $2,141.05 | $1,619.39 | $321.65 | $298,443.45 |
| 4 | Dec 2026 | $2,141.05 | $1,616.57 | $324.48 | $297,918.97 |
| 5 | Jan 2027 | $2,141.05 | $1,613.73 | $327.32 | $297,391.65 |
| 6 | Feb 2027 | $2,141.05 | $1,610.87 | $330.18 | $296,861.48 |
| 7 | Mar 2027 | $2,141.05 | $1,608.00 | $333.05 | $296,328.43 |
| 8 | Apr 2027 | $2,141.05 | $1,605.11 | $335.94 | $295,792.49 |
| 9 | May 2027 | $2,141.05 | $1,602.21 | $338.84 | $295,253.65 |
| 10 | Jun 2027 | $2,141.05 | $1,599.29 | $341.76 | $294,711.90 |
| 11 | Jul 2027 | $2,141.05 | $1,596.36 | $344.69 | $294,167.20 |
| 12 | Aug 2027 | $2,141.05 | $1,593.41 | $347.64 | $293,619.56 |
| 13 | Sep 2027 | $2,141.05 | $1,590.44 | $350.61 | $293,068.95 |
| 14 | Oct 2027 | $2,141.05 | $1,587.46 | $353.59 | $292,515.36 |
| 15 | Nov 2027 | $2,141.05 | $1,584.46 | $356.59 | $291,958.77 |
| 16 | Dec 2027 | $2,141.05 | $1,581.44 | $359.60 | $291,399.17 |
| 17 | Jan 2028 | $2,141.05 | $1,578.41 | $362.64 | $290,836.53 |
| 18 | Feb 2028 | $2,141.05 | $1,575.36 | $365.68 | $290,270.85 |
| 19 | Mar 2028 | $2,141.05 | $1,572.30 | $368.75 | $289,702.10 |
| 20 | Apr 2028 | $2,141.05 | $1,569.22 | $371.83 | $289,130.27 |
| 21 | May 2028 | $2,141.05 | $1,566.12 | $374.93 | $288,555.34 |
| 22 | Jun 2028 | $2,141.05 | $1,563.01 | $378.04 | $287,977.30 |
| 23 | Jul 2028 | $2,141.05 | $1,559.88 | $381.17 | $287,396.13 |
| 24 | Aug 2028 | $2,141.05 | $1,556.73 | $384.32 | $286,811.81 |
| 25 | Sep 2028 | $2,141.05 | $1,553.56 | $387.48 | $286,224.33 |
| 26 | Oct 2028 | $2,141.05 | $1,550.38 | $390.67 | $285,633.66 |
| 27 | Nov 2028 | $2,141.05 | $1,547.18 | $393.87 | $285,039.80 |
| 28 | Dec 2028 | $2,141.05 | $1,543.97 | $397.08 | $284,442.71 |
| 29 | Jan 2029 | $2,141.05 | $1,540.73 | $400.32 | $283,842.40 |
| 30 | Feb 2029 | $2,141.05 | $1,537.48 | $403.57 | $283,238.83 |
| 31 | Mar 2029 | $2,141.05 | $1,534.21 | $406.84 | $282,631.99 |
| 32 | Apr 2029 | $2,141.05 | $1,530.92 | $410.12 | $282,021.87 |
| 33 | May 2029 | $2,141.05 | $1,527.62 | $413.43 | $281,408.44 |
| 34 | Jun 2029 | $2,141.05 | $1,524.30 | $416.75 | $280,791.68 |
| 35 | Jul 2029 | $2,141.05 | $1,520.95 | $420.09 | $280,171.59 |
| 36 | Aug 2029 | $2,141.05 | $1,517.60 | $423.45 | $279,548.14 |
| 37 | Sep 2029 | $2,141.05 | $1,514.22 | $426.83 | $278,921.31 |
| 38 | Oct 2029 | $2,141.05 | $1,510.82 | $430.22 | $278,291.08 |
| 39 | Nov 2029 | $2,141.05 | $1,507.41 | $433.64 | $277,657.45 |
| 40 | Dec 2029 | $2,141.05 | $1,503.98 | $437.07 | $277,020.38 |
| 41 | Jan 2030 | $2,141.05 | $1,500.53 | $440.52 | $276,379.86 |
| 42 | Feb 2030 | $2,141.05 | $1,497.06 | $443.99 | $275,735.86 |
| 43 | Mar 2030 | $2,141.05 | $1,493.57 | $447.48 | $275,088.39 |
| 44 | Apr 2030 | $2,141.05 | $1,490.06 | $450.99 | $274,437.40 |
| 45 | May 2030 | $2,141.05 | $1,486.54 | $454.51 | $273,782.89 |
| 46 | Jun 2030 | $2,141.05 | $1,482.99 | $458.06 | $273,124.83 |
| 47 | Jul 2030 | $2,141.05 | $1,479.43 | $461.62 | $272,463.21 |
| 48 | Aug 2030 | $2,141.05 | $1,475.84 | $465.21 | $271,798.00 |
| 49 | Sep 2030 | $2,141.05 | $1,472.24 | $468.81 | $271,129.19 |
| 50 | Oct 2030 | $2,141.05 | $1,468.62 | $472.43 | $270,456.76 |
| 51 | Nov 2030 | $2,141.05 | $1,464.97 | $476.07 | $269,780.69 |
| 52 | Dec 2030 | $2,141.05 | $1,461.31 | $479.74 | $269,100.95 |
| 53 | Jan 2031 | $2,141.05 | $1,457.63 | $483.42 | $268,417.53 |
| 54 | Feb 2031 | $2,141.05 | $1,453.93 | $487.12 | $267,730.41 |
| 55 | Mar 2031 | $2,141.05 | $1,450.21 | $490.84 | $267,039.57 |
| 56 | Apr 2031 | $2,141.05 | $1,446.46 | $494.58 | $266,344.99 |
| 57 | May 2031 | $2,141.05 | $1,442.70 | $498.35 | $265,646.64 |
| 58 | Jun 2031 | $2,141.05 | $1,438.92 | $502.13 | $264,944.51 |
| 59 | Jul 2031 | $2,141.05 | $1,435.12 | $505.93 | $264,238.58 |
| 60 | Aug 2031 | $2,141.05 | $1,431.29 | $509.76 | $263,528.82 |
The yearly view compares the two schedules side by side. The monthly view follows the accelerated schedule.
This calculator makes the trade visible. Enter your remaining balance, rate and the extra amount you could pay, and see the new payoff date, the interest saved and the effect on each remaining year of the loan.
Every month, interest is charged on the outstanding balance. Paying extra reduces that balance immediately, so every future month charges interest on a smaller number.
That is why an extra payment in year two is worth much more than the same payment in year twenty: the earlier payment removes interest for more months.
A recurring extra payment keeps working for the whole life of the loan and is easy to set up. A lump sum, such as an annual bonus or a tax refund, produces a similar effect concentrated at one point in time.
Use both fields to model a realistic plan: a modest monthly amount plus whatever you can add once a year. The tool applies the annual amount on every twelfth payment, which is how lenders usually process anniversary payments.
Confirm there is no prepayment penalty on your loan, that the extra money is applied to principal rather than to next month’s payment, and that you are not giving up an employer retirement match or a higher-yield savings account to do it.
Each example below was run through the calculator on this page when the site was built, so the numbers match what you see when you enter the same inputs.
Time saved
6 years
Paying $200.00 extra each month clears the loan in Aug 2048 instead of Aug 2054.
A recurring extra payment shortens the loan by several years and removes four figures of interest.
Time saved
5 years
Paying $0.00 extra each month plus $2,000.00 once a year clears the loan in Aug 2049 instead of Aug 2054.
One extra payment a year behaves much like a thirteenth monthly payment.
Time saved
11 years 5 months
Paying $500.00 extra each month plus $1,000.00 once a year clears the loan in Mar 2037 instead of Aug 2048.
On a smaller balance the same discipline can cut close to a decade.
Not always. Some servicers treat an extra amount as an early instalment for next month unless you tell them otherwise. Write on the payment or in the online form that the extra is “principal only”, and check the next statement to confirm the balance fell.
Paying extra produces a guaranteed return equal to your mortgage rate, and the saving is not taxed. Investing may earn more over long periods but can also lose money. Many households split the difference: capture any employer match first, hold an emergency fund, then send the remainder to whichever gives the better guaranteed return.
It depends on the rate, the balance and how early you start. As a rough guide, paying an extra 10% of the monthly payment from the first year of a 30-year loan typically saves about four to five years and a five-figure interest amount on a $300,000 balance.
Monthly is usually better if the money would otherwise sit idle, because every month the balance stays high costs interest. Save for a lump sum only when the cash is earning more than the mortgage rate, or when you need liquidity for emergencies.
No. A standard extra principal payment shortens the term rather than reducing the scheduled instalment. Your required payment stays the same until the loan is recalculated or refinanced.
Paying down principal sooner can end PMI earlier, because PMI typically stops once the balance reaches 80% of the home value. Property tax and insurance escrow are unaffected by the loan balance and continue to be collected as before.
Last reviewed 2026-09-13. This page is an estimate tool, not financial, tax or legal advice.Read the full disclaimer.