Can starting earlier beat saving more?
Predict which of two savers finishes ahead, then test how time, deposits and interest change the result.
Preview · Editorial approval is still pending.
USD examples. Calculator settings do not convert this article’s amounts.
Imagine two people saving toward the same date, 20 years from now. Neither has any money saved at the start.
- Start now: put in $100 a month for all 20 years.
- Wait, then save more: put in nothing for the first 10 years, then $200 a month for the next 10.
Both put in $24,000 of their own money. The second person saves twice as much each month once they start.
Before looking at the result, make a prediction: does the larger monthly deposit catch up?
Make your prediction, then check it
For this experiment, both plans earn a hypothetical 5% annual rate with interest added every month. All deposits arrive at the end of the month. The rate stays constant.
See which plan finishes ahead
Start now · $41,103.37
Wait, then save more · $31,056.46
$0$45,000
Money deposited Modeled interest
| At the end of year 20 | Start now | Wait, then save more |
|---|---|---|
| Money deposited | $24,000.00 | $24,000.00 |
| Modeled interest | $17,103.37 | $7,056.46 |
| Final balance | $41,103.37 | $31,056.46 |
Starting earlier finishes $10,046.91 ahead, despite the identical total deposits. Doubling the later monthly deposit does not recover the missed time in this example.
The early saver’s first deposits have nearly 20 years to earn interest. The later saver’s first deposits have nearly 10. Interest already added can also earn interest: that is compound interest. The Consumer Financial Protection Bureau explains how this works.
The difference comes from when money enters the account and how long it grows. It does not come from the early saver putting in more money.
At 0% interest, both plans finish with exactly $24,000. Time alone does not create growth. A different rate or contribution changes the comparison; starting earlier is not a guarantee of a larger outcome in every situation.
Try to make the later plan catch up
Open the compound interest calculator and choose USD to reproduce this example.
- Enter Starting amount: 0, Monthly contribution: 100, Years: 20, Extra months: 0 and Annual rate: 5. Choose Compound interest and Every month. Under advanced options, choose End of each month and Annual rate. Note the final balance and money you add separately.
- Change Years to 10 and Monthly contribution to 200. This models only the saving years after the 10-year wait. Increase the contribution until the final balance catches the first plan. Watch how much more of your own money that requires.
Then repeat the original $100-for-20-years and $200-for-10-years plans at 0% to check the equal-deposit result yourself. The SEC’s educational calculator offers another way to explore estimated rates and monthly deposits.
This is a timing experiment, not a promised return or a reason to stretch an unaffordable budget. It uses equal-length months and a nominal annual rate divided by 12. It excludes fees, taxes, inflation, withdrawals and investment losses. Actual returns can vary or be negative, and account terms may use different timing rules. See How we calculate for the model details.