What happens if you invest $200 a month
Investing $200 a month at an 8% average annual return grows to about $298,072 after 30 years, from just $72,000 of your own money. Here is the full picture.
Growth table: $200 a month
| Time | You put in | At 6% | At 8% | At 10% |
|---|---|---|---|---|
| 5 years | $12,000 | $13,954 | $14,695 | $15,487 |
| 10 years | $24,000 | $32,776 | $36,589 | $40,969 |
| 15 years | $36,000 | $58,164 | $69,208 | $82,894 |
| 20 years | $48,000 | $92,408 | $117,804 | $151,874 |
| 25 years | $60,000 | $138,599 | $190,205 | $265,367 |
| 30 years | $72,000 | $200,903 | $298,072 | $452,098 |
| 35 years | $84,000 | $284,942 | $458,776 | $759,328 |
| 40 years | $96,000 | $398,298 | $698,202 | $1,264,816 |
Monthly contributions at month end, returns compounded monthly, no taxes or fees. Starting balance $0.
How long until you're a millionaire?
Investing $200 a month from scratch, you would reach $1,000,000 in about 54.5 years at 6%, 44.4 years at 8%, or 37.8 years at 10%.
Why the last decade matters most
Look at the 8% column. Going from 30 to 40 years adds more than the first 20 years combined. That's compounding: in later years, growth on your existing balance far exceeds your contributions. Starting earlier beats investing more later.
Want to add a starting balance or raise your contribution each year? Try the compound interest calculator with $200/month pre-filled.
Where to invest $200 a month
For most people, a low-cost, broadly diversified index fund (a total US market or S&P 500 fund, often paired with an international fund) inside a tax-advantaged account is the simplest place to start. Many brokers let you schedule automatic monthly investments, including fractional shares.
Common questions
How much will $200 a month be worth in 20 years?
About $117,804 at an 8% annual return, $92,408 at 6%, or $151,874 at 10%. You would have contributed $48,000.
Is an 8% return realistic?
The US stock market has returned about 10% a year nominally over the long run, but with big swings and decade-long flat stretches. 6–8% is a common planning assumption for a stock-heavy portfolio.