If your employer offers a 401(k) plan and you are not contributing to it, you may be leaving thousands of dollars on the table every year. The 401(k) is America's most popular retirement savings vehicle — yet many workers do not understand how it works or how to get the most out of it.
What Is a 401(k)?
A 401(k) is a tax-advantaged retirement savings account offered by employers. The name comes from the section of the IRS tax code that governs it. You contribute pre-tax dollars directly from your paycheck, which lowers your taxable income today. Your money then grows tax-deferred — you only pay taxes when you withdraw funds in retirement.
The Employer Match: Free Money
Many employers offer a matching contribution — typically 50% to 100% of your contributions up to a certain percentage of your salary. If you earn $60,000 and contribute 5% ($3,000), your employer adds another $3,000. That is an instant 100% return before any market gains. Never leave this match on the table — it is the best guaranteed return you will ever find.
Contribution Limits for 2025
For 2025, the IRS allows you to contribute up to $23,500 to your 401(k) per year. If you are age 50 or older, you can make an additional catch-up contribution of $7,500, for a total of $31,000.
Traditional 401(k) vs. Roth 401(k)
- Traditional 401(k): Contributions are pre-tax. You pay taxes upon withdrawal in retirement. Best if you expect to be in a lower tax bracket in retirement.
- Roth 401(k): Contributions are after-tax. Withdrawals in retirement are completely tax-free. Best if you expect to be in a higher tax bracket later.
How to Invest Your 401(k)
Most 401(k) plans offer a menu of mutual funds and target-date funds. Target-date funds are the simplest choice — you pick the fund closest to your expected retirement year and it automatically adjusts its stock and bond mix as you age. For DIY investors, a mix of low-cost index funds tracking the US market, international markets, and bonds is a proven strategy.
What Happens If You Leave Your Job?
When you leave an employer, you can roll your 401(k) over to an Individual Retirement Account (IRA), which often gives you more investment choices and lower fees. Avoid cashing out early — you will owe income tax plus a 10% early withdrawal penalty.
Final Thoughts
The 401(k) is one of the greatest wealth-building tools available to American workers. Contribute at least enough to capture the full employer match, increase your contributions over time, and invest in low-cost diversified funds. These simple habits, maintained consistently, can build a million-dollar retirement nest egg for ordinary workers.
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