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Kevin O’Leary has a favorite rule: invest 15% of every dollar you earn, and you’ll retire rich. He says a $68,000 earner who does it can end up a millionaire — his math lands somewhere north of $5 million by 65 (1).
Here’s the thing. As a CPA since 1981, I’ve run that calculation a thousand times, and O’Leary’s arithmetic is right. Fifteen percent of $68,000 is $10,200 a year. Invested from 25 to 65 at the stock market’s long-run average of about 10%, that really does snowball into millions.
So why isn’t everyone a millionaire? Because the rule collides with a wall.
The median 401(k) balance in America is just $44,115, according to Vanguard (2). And the national personal saving rate sits at 3% — one-fifth of what O’Leary is prescribing (3). Mr. Wonderful’s rule isn’t wrong. It just skips the hardest part: finding the 15% in the first place.
That’s not a discipline problem. It’s a cash-flow problem. So here’s how a real earner actually gets there.
1. Kill the debt that’s eating your 15%
You can’t invest at 10% while you’re paying 22% on a credit card. The math runs backward. Before you chase O’Leary’s returns, clear the high-interest debt stealing them.
If you’re carrying $15,000 or more in unsecured debt, National Debt Relief will review your situation for free and estimate when you could be debt-free — with no upfront fee.
Every dollar you stop sending the bank is a dollar you can finally send yourself.
2. Find the money you’re already losing
Most people don’t have a spare $850 a month lying around — but they’re often leaking a chunk of it without noticing.
Forgotten subscriptions, auto-renewing trials, and bills that creep up every year are the easiest money to reclaim. Rocket Money puts every recurring charge on one screen, cancels what you don’t want, and negotiates your cable, internet, and phone bills. That’s real cash you can redirect straight into the market.
Quick gut-check — if your money advice is coming from random online influencers, you’re playing a dangerous game. I’ve been a CPA since 1981 and writing about money since before the internet existed. Sign up for the free Money Talks Newsletter and get expert advice that’s been tested by time.
3. Start small — 15% doesn’t have to happen overnight
Here’s where O’Leary and I part ways on tone. Telling a stretched worker to save 15% tomorrow can be so discouraging they save nothing. The trick is to start where you are and climb.
Begin with whatever you can — even a few dollars — and raise it a percentage point every time you get a raise.
SoFi Active Invest lets you start with as little as $5, buy fractional shares, and trade with no commissions. Fund an account with $50 and you may get a stock award worth $5 to $1,000. You can learn more here.
4. Grow the income side, not just the savings side
There’s a ceiling to how much you can cut. There’s no ceiling on what you can earn. When 15% feels impossible on your current paycheck, the answer is sometimes a bigger paycheck.
A few hours of side income a week, funneled straight to investing, can close the gap faster than any budgeting trick.
Example? Freecash pays real cash for surveys, tasks, and games, with payouts as low as $5 — an easy way to turn spare time into seed money. See how it works here.
The bottom line
O’Leary is selling the destination. My job is to hand you the map. His 15% rule is genuinely powerful — compounding is the closest thing to magic in all of finance — but a rule you can’t follow is just a source of guilt.
Don’t measure yourself against $5 million on day one. Measure yourself against last month. Clear a little more debt, plug a few more leaks, nudge the percentage up, and let time do the heavy lifting.
The millionaire O’Leary describes isn’t a myth. She just didn’t get there in one leap. She got there one point at a time — and she started before she felt ready.
Sources
1. TheStreet; 2. Vanguard, How America Saves 2026; 3. U.S. Bureau of Economic Analysis