What Is a 401(k)
A 401(k) is an employer-sponsored retirement savings plan, named after the section of the U.S. tax code that created it, that allows employees to contribute a portion of their salary into an investment account with tax advantages. Contributions are typically invested in a menu of mutual funds or target-date funds selected by the plan administrator.
Annual contribution limits are set by the IRS and adjusted periodically for inflation, with additional ‘catch-up’ contributions allowed for employees above a certain age.
Traditional vs. Roth 401(k)
Traditional 401(k): tax break now
Contributions to a traditional 401(k) are made with pre-tax dollars, reducing taxable income in the contribution year, but withdrawals in retirement are taxed as ordinary income.
Roth 401(k): tax break later
Roth 401(k) contributions are made with after-tax dollars, so there’s no upfront tax deduction, but qualified withdrawals in retirement — including all investment growth — are entirely tax-free.
Why Employer Matching Matters
Many employers match a portion of employee contributions, commonly a percentage of salary up to a certain contribution level. Failing to contribute enough to capture the full employer match is often described as leaving free money on the table, since it represents an immediate, guaranteed return unmatched by most other investments.
Traditional 401(k) vs. Roth 401(k)
| Aspect | Traditional 401(k) | Roth 401(k) |
|---|---|---|
| Contribution tax treatment | Pre-tax (reduces current taxable income) | After-tax (no current deduction) |
| Withdrawal tax treatment | Taxed as ordinary income | Tax-free if qualified |
| Best suited for | Expecting lower tax bracket in retirement | Expecting higher tax bracket in retirement |
Frequently Asked Questions
What happens to my 401(k) if I change jobs?
You can typically leave the funds in the former employer’s plan (if allowed), roll them over into an IRA, or roll them into a new employer’s 401(k) plan, each with different implications for fees and investment options.
Is there a penalty for withdrawing from a 401(k) early?
Generally, withdrawals before age 59½ are subject to a 10% early withdrawal penalty in addition to ordinary income tax, though certain exceptions like hardship withdrawals or specific life events may apply.
How much should I contribute to get the full employer match?
This depends entirely on your employer’s specific matching formula, but a common approach is to contribute at least enough to capture the maximum match percentage offered, since it functions as an immediate return on that portion of savings.
Can I have both a traditional and Roth 401(k)?
Yes, many employer plans allow employees to split contributions between traditional and Roth accounts, subject to the same combined annual contribution limit.
Key Takeaways
A 401(k) is an employer-sponsored retirement plan offering tax-advantaged growth through either traditional (pre-tax) or Roth (after-tax) contributions, with many employers adding a matching contribution as an extra incentive to save. Understanding the tax tradeoffs and capturing the full employer match are key to making the most of the plan. This article is for informational purposes only and does not constitute investment advice.
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