I love modeling how small sums invested regularly can snowball into huge sums over time. Why? Because it’s so true — it can really happen to you.
Let’s review some scenarios. The table below shows what happens if you invest just $1,200 per year (that’s $100 per month) in an IRA. While the stock market has averaged annual returns of close to 10% over many decades, we’ll be a little conservative and assume 8% average annual growth.
Where to invest $1,000 right now? Our analyst team just revealed what they believe are the 10 best stocks to buy right now. Learn More »

Image source: Getty Images.
$1,200 Invested Annually and Growing For: |
Growing at 8% |
---|---|
10 years |
$18,775 |
15 years |
$35,189 |
20 years |
$59,308 |
25 years |
$94,745 |
30 years |
$146,815 |
35 years |
$223,323 |
40 years |
$335,737 |
Data source: Calculations by author.
Impressive, right? And that’s just with $100 per month. But truth be told, amassing $35,189 or even $335,737 isn’t going to get you very far in retirement. For some people, even a million dollars may not be enough. This table reflects bigger annual investments:
Growing at 8% For |
$7,500 Invested Annually |
$15,000 Invested Annually |
---|---|---|
Five years |
$47,519 |
$95,039 |
10 years |
$117,341 |
$234,682 |
15 years |
$219,932 |
$439,864 |
20 years |
$370,672 |
$741,344 |
25 years |
$592,158 |
$1,184,316 |
30 years |
$917,594 |
$1,835,188 |
35 years |
$1,395,766 |
$2,791,532 |
40 years |
$2,098,358 |
$4,196,716 |
Data source: Calculations by author.
If you can’t swing socking away $7,500 annually ($625 per month, on average) or $15,000 annually ($1,250), do what you can. Remember that your earliest invested dollars have the most time in which to grow for you. And if you’re using a Roth IRA, all you amass might be yours without taxes!
Retirement planning is very important, so take some time to think through issues such as how much income you’ll need to retire with and how you’ll amass it. Come up with a plan, and then stick with it. Don’t be afraid to consult a financial advisor, either.
The $22,924 Social Security bonus most retirees completely overlook
If you’re like most Americans, you’re a few years (or more) behind on your retirement savings. But a handful of little-known “Social Security secrets” could help ensure a boost in your retirement income. For example: one easy trick could pay you as much as $22,924 more… each year! Once you learn how to maximize your Social Security benefits, we think you could retire confidently with the peace of mind we’re all after. Simply click here to discover how to learn more about these strategies.
View the “Social Security secrets” »
The Motley Fool has a disclosure policy.