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Home / Compound interest / $500 a month, 20 years

$500 a Month for 20 Years

Regular deposits of $500 grow faster than the deposits alone because of interest. This page shows it over 20 years at 6 percent.

The final balance on the starting figures is $231,020. You would deposit $120,000 yourself.

$
$
%
years
%
Final balance
$231,020
Total you put in
$120,000
Interest earned
$111,020
Year by year
YearTotal put inBalance
1$6,000$6,168
2$12,000$12,716
3$18,000$19,668
4$24,000$27,049
5$30,000$34,885
6$36,000$43,204
7$42,000$52,037
8$48,000$61,414
9$54,000$71,370
10$60,000$81,940
11$66,000$93,161
12$72,000$105,075
13$78,000$117,724
14$84,000$131,152
15$90,000$145,409
16$96,000$160,546
17$102,000$176,616
18$108,000$193,677
19$114,000$211,790
20$120,000$231,020
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How the growth is worked out

Each deposit earns interest from the month it arrives until the end. An early deposit grows for many months while a late one grows for few. The calculator adds up all 240 deposits of $500 at the monthly rate of 0.5 percent to get the final balance.

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Worked example

Deposit $500 each month for 20 years at 6 percent. The balance reaches $231,020.

Without interest the same deposits would reach only $120,000. Interest adds $111,020 on top.

Questions about this calculator

What would it take to match $231,020 over 20 years if you started 5 years later at 6 percent?

You would need $794.38 a month for 15 years instead of $500 for 20. Starting early does much of the work.

How much would $1,000 a month reach over 20 years at 6 percent?

$462,041 at 6 percent. That is 2 times the balance from $500 a month.

What if the return on $500 a month over 20 years were 5 percent instead of 6?

The balance would be $205,517 instead of $231,020. A return one point higher gives $260,463.

What if you stopped the $500 deposits halfway through 20 years at 6 percent?

After 10 years the balance is $81,940. Left alone for the second half, it would grow to $149,081 instead of $231,020.

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This page is for education only and is not financial or tax advice.