Extra Mortgage Payment Chart
What each extra $25 a month does to a $420,000 loan at 6.125% over 30 years: the payoff date, the interest saved, and the months cut off the term. The first hundred dollars is worth more than the fourth, because a dollar of principal removes every future dollar of interest it would have carried.
Source data and formula checked · How we check
Extra Mortgage Payment Chart reads paid off in straight off extra principal each month, for 24 values from 0 to 1500. Every row is computed from the same formula the calculator uses, not measured or copied from another table, so a value between two rows can be worked out the same way. The formula is the one published by US Consumer Financial Protection Bureau.
Principal and interest only, on a $420,000 loan at 6.125% over 30 years. Confirm with your servicer that extra payments are applied to principal and not held as a prepaid instalment.
| Extra principal each month (usd) | Paid off in | Total interest | Months cut off the term |
|---|---|---|---|
| 0 | 30 yr | $498,707 | 0 months |
| 25 | 29 yr 2 mo | $482,555 | 9.76 months |
| 50 | 28 yr 5 mo | $467,572 | 18.88 months |
| 75 | 27 yr 9 mo | $453,623 | 27.44 months |
| 100 | 27 yr 1 mo | $440,595 | 35.49 months |
| 125 | 26 yr 5 mo | $428,393 | 43.08 months |
| 150 | 25 yr 10 mo | $416,932 | 50.25 months |
| 175 | 25 yr 3 mo | $406,142 | 57.05 months |
| 200 | 24 yr 9 mo | $395,961 | 63.5 months |
| 225 | 24 yr 2 mo | $386,335 | 69.63 months |
| 250 | 23 yr 9 mo | $377,216 | 75.48 months |
| 275 | 23 yr 3 mo | $368,562 | 81.06 months |
| 300 | 22 yr 10 mo | $360,336 | 86.39 months |
| 350 | 21 yr 12 mo | $345,038 | 96.37 months |
| 400 | 21 yr 2 mo | $331,097 | 105.56 months |
| 450 | 20 yr 6 mo | $318,328 | 114.05 months |
| 500 | 19 yr 10 mo | $306,582 | 121.93 months |
| 600 | 18 yr 8 mo | $285,681 | 136.11 months |
| 700 | 17 yr 7 mo | $267,614 | 148.55 months |
| 800 | 16 yr 8 mo | $251,819 | 159.57 months |
| 900 | 15 yr 11 mo | $237,877 | 169.42 months |
| 1000 | 15 yr 2 mo | $225,469 | 178.28 months |
| 1250 | 13 yr 7 mo | $199,656 | 197.02 months |
| 1500 | 12 yr 4 mo | $179,323 | 212.09 months |
Questions people actually ask
- How do I read the Extra Mortgage Payment Chart?
- Find your extra principal each month in the first column and read across. At 0 usd the paid off in is 30 yr; at 1500 usd it is 12 yr 4 mo. The table runs from 0 usd to 1500 usd in 24 rows.
- Can I read between two rows?
- Not by splitting the difference. The paid off in does not change by the same amount from row to row, so the midpoint of two rows is not the answer for the midpoint of two extra principal each month values. Put the exact figure into the calculator instead — it uses the same formula that produced every row here.
- What if my extra principal each month is outside the table?
- The chart covers 0 usd to 1500 usd, which is the range people actually look up. Anything above or below goes into the calculator, which takes any figure and shows each step of the working rather than only the result. Open the amortization calculator.
- Where do these numbers come from?
- Every row is computed at build time from the formula published by US Consumer Financial Protection Bureau, by the same code behind the calculator — not transcribed from another table, which is how a rounding error in one chart ends up in twenty.
Need a different number?
The chart covers the common values. For anything between the rows, the amortization calculator takes any figure and shows the working.
Source: US Consumer Financial Protection Bureau — how loan amortization works, US CFPB — biweekly mortgage payment programs