When you are ready to save for retirement, two of the most popular accounts are the 401(k) and the Roth IRA. Each offers valuable tax advantages, but they work differently, and the best choice depends on your income, your employer and your goals. This guide compares the two and shows a simple priority order that works for many savers.
What Is a 401(k)?
A 401(k) is an employer-sponsored retirement plan. You choose how much of your paycheck to contribute, and the money is invested in the plan’s menu of funds. Many employers offer a match, which is extra money added to your account when you contribute. There are two common versions:
- Traditional 401(k). Contributions are pre-tax, lowering your taxable income now. You pay income tax on withdrawals in retirement.
- Roth 401(k). Contributions are made with after-tax money, but qualified withdrawals in retirement are tax-free, if your plan offers this option.
For 2026, the employee contribution limit is $24,500, and savers age 50 and over can contribute extra catch-up amounts. Limits change annually, so check the IRS website at irs.gov.
What Is a Roth IRA?
A Roth IRA is an individual retirement account you open on your own with a brokerage or bank. You contribute after-tax dollars, the money grows tax-free and qualified withdrawals in retirement are tax-free. For 2026, the contribution limit is $7,500, with additional catch-up for those 50 and older. Eligibility phases out at higher incomes, so check the current thresholds.
You can withdraw your contributions, not earnings, at any time without tax or penalty, which makes a Roth IRA more flexible than a 401(k) in an emergency. Earnings may be taxed and penalized if withdrawn early, unless an exception applies.
Side-by-Side Comparison
| Feature | 401(k) | Roth IRA |
|---|---|---|
| Who sponsors it | Employer | You |
| Contribution limit (2026) | $24,500 plus catch-up | $7,500 plus catch-up |
| Tax treatment | Pre-tax (traditional) or after-tax (Roth 401(k)) | After-tax, tax-free withdrawals |
| Employer match | Often available | None |
| Income limits | No limit to contribute | Phase-out for high earners |
| Investment choices | Limited plan menu | Nearly any fund or stock at your brokerage |
| Required distributions | Yes for traditional, rules for Roth have changed | None for the original owner |
| Early access | Penalties and rules apply | Contributions can be withdrawn |
The Match Comes First
If your employer matches your contributions, start by contributing enough to receive the full match. It is an immediate, risk-free return on your money. Not capturing the match is leaving part of your compensation behind.
A Common Priority Order
Many planners suggest an order like this, though your situation may differ:
- Contribute to your 401(k) up to the full employer match.
- Pay off high-interest debt and build an emergency fund. See how to build an emergency fund.
- Max out a Roth IRA if you qualify, or an HSA if eligible. See the HSA guide.
- Return to the 401(k) and contribute more, up to the limit.
- Invest in a taxable account if you still have money to save. See how to start investing with little money.
Traditional or Roth: Which Tax Treatment?
The key question is whether your tax rate will be higher now or in retirement.
- If you expect a lower tax rate in retirement, traditional contributions may save more, since you deduct at a higher rate now.
- If you expect a higher rate later, or you are early in your career in a low bracket, Roth contributions may be better.
- If you are unsure, splitting contributions between traditional and Roth creates tax diversification.
Remember that withdrawals from traditional accounts count as taxable income, which can affect taxes on Social Security benefits and Medicare premiums. See when to claim Social Security for related planning.
Investment Choices and Fees
401(k) plans offer a limited menu, often including target-date funds and index funds. Check expense ratios and avoid high-fee options when cheaper ones exist. A Roth IRA gives you freedom to choose low-cost index funds or ETFs. Our comparison of index funds vs. ETFs can help you choose.
What If You Leave Your Job?
You can roll a 401(k) into an IRA or a new employer’s plan, or sometimes leave it where it is. Avoid cashing out, which can trigger taxes and a 10 percent penalty if you are under 59½. A direct rollover prevents withholding and keeps the tax advantage.
Roth Conversions and Backdoor Roths
High earners who cannot contribute directly to a Roth IRA sometimes use a backdoor Roth, contributing to a traditional IRA and converting it. The rules, including the pro-rata rule, are complex, so consider professional advice. Conversions are taxable in the year you convert.
Common Mistakes
- Not contributing enough to get the match.
- Cashing out a 401(k) when changing jobs.
- Choosing high-fee funds.
- Ignoring Roth options because of unfamiliarity.
- Withdrawing early and paying penalties.
- Leaving contributions uninvested in cash.
- Failing to increase contributions as income grows.
A Quick Example
Suppose you earn $70,000 and your employer matches 50 percent of contributions up to 6 percent of pay. Contributing $4,200 gets you a $2,100 match, an instant 50 percent return. You might then put another $7,500 into a Roth IRA for tax-free growth, and if you still have room in your budget, return to the 401(k) for additional contributions. This layered approach captures the match, adds flexibility and builds both tax-deferred and tax-free buckets.
Review Your Allocation
Whichever account you choose, what you invest in matters as much as where you hold it. Check that your 401(k) and Roth IRA are not both invested in the same overlapping funds without a plan. Decide on your overall mix of stocks and bonds across all accounts, and use target-date funds if you prefer a hands-off option. Revisit your contribution rate each year, ideally increasing it when you receive a raise.
Frequently Asked Questions
Can I have both a 401(k) and a Roth IRA?
Yes. Many people contribute to both, subject to each account’s limits and eligibility rules.
Is a Roth IRA better than a 401(k)?
Neither is universally better. Use the 401(k) for the match and high limits, and a Roth IRA for flexibility and tax-free growth.
What if my income is too high for a Roth IRA?
You may use a Roth 401(k) if available, or consider a backdoor Roth with professional guidance.
How much should I save?
Many experts suggest saving 10 to 15 percent of income for retirement, including any match. See how much to save for retirement.
Bottom Line
Use your 401(k) to capture the match and benefit from high limits, add a Roth IRA for flexibility and tax-free growth, and choose between traditional and Roth contributions based on your expected future tax rate. The most important step is to start and keep contributing.
Related guides
- Index Funds vs. ETFs: What’s the Difference?
- How Much Should You Save for Retirement at Every Age?
- Standard Deduction vs. Itemizing: Which Saves You More?
- Certificates of Deposit (CDs) Explained: Rates, Terms and Penalties
This article is for general education only and is not financial, tax, legal or insurance advice. Rates, limits and rules change, so confirm current details with the provider or a licensed professional before you decide.