Kevin O'Leary Says This 401(k) Habit Separates Millionaires From Everyone Else

Kevin O'Leary has a theory about why some people retire millionaires, while others struggle to live comfortably. And it doesn't have anything to do with luck, a fat paycheck, or timing the market. The Shark Tank investor says the real difference is the ability to consistently contribute to a 401(k) year after year, for decades.

O'Leary has made this point repeatedly in media appearances, and his advice boils down to one blunt, repeatable habit. Here's the 401(k) habit he preaches and what to do to catch up if you're falling behind on your retirement readiness.

Aim to save at least 15% of your salary consistently

O'Leary recommends contributing 15% of your salary to your 401(k) and letting it compound over time. He believes that treating retirement contributions as any other mandatory bill takes emotion out of investing and lets you avoid trying to time the market.

According to O'Leary, an average American makes about $60,000 a year. Investing 15% of that would be $9,000 a year. Contributing consistently for 35 years, assuming an average return of 8% a year, those investments could grow to around $1.5 million by retirement.

Remember, O'Leary's projection is based on assumed returns, not a guarantee. Market returns fluctuate over time, and past performance is no guarantee of future results.

However, the lesson remains the same: consistently investing over decades and letting compounding do its work matters much more than trying to pick winning stocks or timing when to buy and sell.

Employer match is free money

If there is one piece of advice O'Leary has about retirement that's non-negotiable, it's contributing enough to get the full 401(k) match from your employer.

He describes matching contributions as an immediate return on your money. So, if your employer matches contributions dollar-for-dollar on the first 3% of your salary, contributing 3% could instantly double your investment before it earns any market return.

Matching formulas vary by employer, but many plans offer some sort of matching contribution that can go a long way toward building your retirement savings.

O'Leary recommends treating the match as a bonus, not a substitute. He suggests increasing contributions beyond the matching threshold whenever possible.

Trim spending and pay down debt

Saving 15% of your income may sound simple in theory, but O'Leary acknowledges that many households feel squeezed by rising living expenses.

His advice is to stop buying "all that crap you don't need" and put that money into a 401(k). Cut subscriptions you rarely use, consider cooking meals at home rather than ordering takeout, or delay your next device upgrade and direct that money toward your retirement accounts.

But if you have high-interest debt, that may slow down your progress. O'Leary says that carrying balances on credit cards or other high-interest debt crowds out investing for retirement, as every dollar that goes toward interest is a dollar not compounding in your favor. He says paying down high-interest debt may free up cash to fund your 401(k).

Don't rely on Social Security to fund retirement

Like many finance experts, O'Leary also says Social Security should be treated as a supplement, not a sole source of retirement income.

You've probably heard that Social Security will likely run out of reserves in 2032 and may only be able to pay about 78% of scheduled benefits — that's a 22% cut.

For this reason, having personal savings is crucial.

If 15% feels impossible, start smaller

Many workers can't afford to save 15% immediately, especially while managing high housing costs, childcare, and student loans.

If contributing 15% isn't possible today, O'Leary recommends building the habit by contributing enough to capture the full employer match. From there, you can increase your contributions by a percentage point or two every time you get a raise.

Those gradual increases may feel more manageable when they coincide with raises because you may still see your take-home pay increase.

Bottom line

O'Leary's core message for anyone wanting to retire a millionaire is that a few repeatable habits can make all the difference. Capture a full employer match, automate regular retirement contributions, and let consistency compound.

No investment approach can guarantee a seven-figure retirement portfolio, and future market returns can never be guaranteed. But investing consistently has been one of the most reliable ways to build wealth over decades.

For many people, this one habit can help you retire early and enjoy your golden years. However, this is only possible if you're consistent with your contributions and increasing them every time your income goes up.

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