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Home / Compound interest / $1,000 a month, 20 years

$1,000 a Month for 20 Years

Saving $1,000 every month for 20 years is a steady habit. See what 6 percent a year does to it. The page starts with an empty account.

The final balance on the starting figures is $462,041. You would deposit $240,000 yourself.

$
$
%
years
%
Final balance
$462,041
Total you put in
$240,000
Interest earned
$222,041
Year by year
YearTotal put inBalance
1$12,000$12,336
2$24,000$25,432
3$36,000$39,336
4$48,000$54,098
5$60,000$69,770
6$72,000$86,409
7$84,000$104,074
8$96,000$122,829
9$108,000$142,740
10$120,000$163,879
11$132,000$186,323
12$144,000$210,150
13$156,000$235,447
14$168,000$262,305
15$180,000$290,819
16$192,000$321,091
17$204,000$353,231
18$216,000$387,353
19$228,000$423,580
20$240,000$462,041
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How the growth is worked out

Picture a loop that repeats 240 times. Inside the loop the balance is multiplied by one plus the monthly rate of 0.5 percent. Then the monthly deposit of $1,000 is added. When the loop ends the balance is your result.

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Worked example

A monthly deposit of $1,000 for 20 years comes to $240,000 of your own money. The ending balance is $462,041.

Interest accounts for $222,041. That is 48 percent of the final balance.

Questions about this calculator

What if the return on $1,000 a month over 20 years were 5 percent instead of 6?

The balance would be $411,034 instead of $462,041. A return one point higher gives $520,927.

What if you stopped the $1,000 deposits halfway through 20 years at 6 percent?

After 10 years the balance is $163,879. Left alone for the second half, it would grow to $298,162 instead of $462,041.

What would it take to match $462,041 over 20 years if you started 5 years later at 6 percent?

You would need $1,588.76 a month for 15 years instead of $1,000 for 20. Starting early does much of the work.

How much would $2,000 a month reach over 20 years at 6 percent?

$924,082 at 6 percent. That is 2 times the balance from $1,000 a month.

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