How Ordinary Investors Become 401(k) Millionaires

The Millionaire Maker You Probably Already Have

The investment that creates more everyday millionaires than almost any other doesn't require a hedge fund, a hot stock tip, or a financial genius.

You probably already have one. It's your 401(k).

But most people aren't using it to its full potential.

The classic "millionaire next door" isn't day trading or reading stock charts. They aren't chasing tips on internet forums either.

What they're doing is much less exciting. And it works.

In this article, I'll walk through the three habits that turn an ordinary 401(k) into a seven-figure account, plus a few ways to get even more out of yours.

401(k) Millionaires by the Numbers

Becoming a 401(k) millionaire isn't as rare as it might sound.

In mid-2025, Fidelity counted a record 595,000 people with $1 million or more in their 401(k) accounts. That's just at one company. (Fidelity)

Fidelity's data also shows what typical savers are doing. The average total 401(k) savings rate was 14.2%, made up of 9.5% from employees and 4.8% from employers.

And during a turbulent stretch in the market that quarter, only 5.5% of savers changed how their 401(k) was invested.

That last number says a lot. Most of the people building real wealth in their 401(k) aren't doing anything clever. They're saving steadily and staying put.

Habit 1: Invest Consistently Over a Long Period of Time

The single biggest driver of a large 401(k) balance is time.

Compound growth needs years to do its work. In the early years, your balance grows mostly from your own contributions. Later on, investment growth starts to do more of the heavy lifting than your paycheck does.

What Consistency Looks Like

Let's say you earn $100,000 and save 14.3% of your pay between your contributions and your employer's. That's about $14,300 a year.

Assuming a hypothetical 7% average annual return, here's how that grows over time:

20 years: about $586,000.

25 years: about $904,000.

30 years: about $1.35 million.

35 years: about $1.98 million.

This example assumes no raises, no change in contributions, and a steady return every year. Real markets move up and down, and actual results will differ.

These figures are hypothetical illustrations, not guaranteed returns or results from a specific investment. They assume contributions made at the end of each year and exclude taxes, fees, and inflation. Investments can lose value, and past performance does not guarantee future results.

Still, the pattern is what matters. The difference between saving for 25 years and 35 years is more than $1 million.

Why Starting Early Matters So Much

You can't buy back time. A dollar invested in your 20s has decades longer to compound than a dollar invested in your 40s.

If you're starting later, that's okay. It simply means the other two habits become even more important.

Habit 2: Contribute Enough to Get the Full Employer Match (and Then Some)

If your employer offers a 401(k) match, it's one of the best deals available to you.

A match is money your employer adds to your account when you contribute. A common formula is a 100% match on the first 3% to 6% of your pay that you put in.

That's an immediate return on your contribution before your investments do anything at all.

What Missing the Match Costs You

Say you earn $100,000 and your employer matches 100% of the first 4% you contribute. If you skip the match, you're leaving $4,000 a year on the table.

Invested for 30 years at a hypothetical 7% return, that missed money could have grown to roughly $378,000.

This hypothetical match example also assumes annual contributions at the end of each year and excludes taxes, fees, and inflation. Your actual employer match, vesting rules, and investment returns will determine your results.

That's why the match should be the floor, not the goal.

Going Beyond the Match

The people who reach seven figures usually contribute more than the minimum needed for the match.

Many financial professionals suggest saving around 15% of your income for retirement, including your employer's contribution. If that feels like too big a jump, increase your contribution by 1% each year until you get there.

One quick thing to check: some matches come with a vesting schedule. That means you may need to stay with the company for a certain number of years before the employer money is fully yours.

Habit 3: Dollar-Cost Average Through Up and Down Markets

Dollar-cost averaging means investing a set amount on a regular schedule, no matter what the market is doing.

If you contribute to a 401(k) through payroll, you're already doing it. A slice of every paycheck goes into your investments automatically.

Why It Works

When prices are high, your contribution buys fewer shares. When prices drop, the same contribution buys more shares.

Over time, that can lower your average cost per share. More importantly, it takes the guesswork and emotion out of investing.

Dollar-cost averaging does not guarantee a profit or protect against losses in declining markets. You need to be able to keep investing through market downturns for the approach to work as intended.

The Hard Part: Staying the Course

The real challenge isn't setting up automatic contributions. It's leaving them alone when the market falls.

When headlines get scary, many people are tempted to stop contributing or move everything to cash. But market downturns are often when your contributions buy the most shares at the lowest prices.

Selling during a drop can also lock in losses and cause you to miss the recovery. Some of the market's best days have historically come shortly after some of its worst.

The millionaire next door doesn't try to time the market. They keep contributing, month after month, through good markets and bad.

Is a 401(k) a Scam?

Every so often, someone online claims that 401(k) plans are a scam. If someone has told you that, I'd genuinely like to hear their reasons.

Most of the criticisms point to real trade-offs. But trade-offs aren't the same as a scam. Here are the most common objections and how I'd respond.

"The Fees Are Too High"

Some 401(k) plans do have high fees, especially at smaller companies. That's worth checking.

But many plans now offer low-cost index funds. And even in a plan with higher fees, the tax benefits and the employer match usually outweigh the cost, at least up to the match.

"My Money Is Locked Up"

Withdrawals before age 59 and a half generally come with a 10% penalty on top of income taxes. There are exceptions, but the rules are strict.

That's a feature as much as a limitation. It keeps retirement money working toward retirement instead of being spent along the way.

"I Don't Have Enough Investment Choices"

It's true that you're limited to the menu your plan offers. But most plans include a diversified mix of stock funds, bond funds, and target-date funds. That's more than enough to build a solid long-term portfolio.

"I'll Just Pay Taxes Later Anyway"

With traditional contributions, you do pay taxes when you withdraw. But you also got a tax break up front and decades of tax-deferred growth. Many plans also offer a Roth option if you'd rather pay taxes now and withdraw tax-free later.

When you add it all up, the 401(k) has created more everyday millionaires than any hot stock tip ever will.

How to Get More Out of Your 401(k)

Once the three core habits are in place, a few small moves can make your 401(k) work even harder.

Turn On Automatic Increases

Many plans let you raise your contribution rate automatically each year, often by 1%. If you time it with your annual raise, you'll barely notice the difference in your paycheck.

Choose Between Traditional and Roth

If your plan offers a Roth 401(k), you can choose whether to take your tax break now or in retirement. Many people split contributions between the two to build tax flexibility for later.

Keep Your Investments Simple

You don't need to pick a dozen funds. A target-date fund or a simple mix of low-cost stock and bond funds can do the job well. Check your allocation once or twice a year and rebalance if it has drifted.

Keep Track of Old Accounts

If you've changed jobs, you may have old 401(k)s scattered around. Consolidating them into your current plan or an IRA can make them easier to manage and help you avoid paying unnecessary fees.

Before rolling over an old account, compare fees, investment choices, creditor protections, withdrawal rules, and any employer-stock tax considerations. An IRA rollover can also affect backdoor Roth strategies; consolidation is not automatically the best choice.

For Business Owners: Consider a Solo 401(k) or Your Own Plan

If you're self-employed or own a small business, you can set up a 401(k) of your own. A Solo 401(k) lets you contribute both as the employee and as the employer, which can allow much larger contributions than an IRA.

A Solo 401(k) generally covers a business owner with no eligible common-law employees other than a spouse. If you hire eligible employees, different plan coverage and contribution requirements apply.

If you have employees, a company 401(k) with a match can also become a strong tool for hiring and keeping good people.

Boring Is a Feature, Not a Bug

The path to becoming a 401(k) millionaire isn't flashy. There's no secret strategy or perfectly timed trade.

It comes down to three habits: invest consistently over a long period, contribute more than enough to capture your employer match, and keep buying through both up and down markets.

The best part is that once those habits are on autopilot, you don't have to overthink your 401(k). That frees up your time and attention for literally anything else.

If you're not sure whether you're saving enough, or your 401(k) hasn't had a checkup in a while, now is a good time to take a fresh look.

Sources

• Fidelity Investments, Q2 2025 Retirement Analysis

• Empower, Becoming the 401(k) Millionaire Next Door