401k vs IRA Comparison Guide: Pick the Right Account for 2026
Quick Answer
If your employer offers a 401(k) match, start there — it's a 50% to 100% return on day one. After capturing the full match, funnel extra savings into a Roth IRA when your income allows, then return to the 401(k) for tax-deferred catch-up contributions. Most savers end up using both, and that's usually the winning move.
The Basics
A 401(k) is a workplace retirement plan. You contribute pre-tax dollars (or Roth dollars, if the plan allows), reducing your taxable income today. Your money grows tax-deferred, and you pay ordinary income tax on withdrawals in retirement. Many employers sweeten the deal with matching contributions, which is part of why these plans dominate retirement savings.
An IRA — Individual Retirement Arrangement — is something you open on your own through a brokerage. The traditional version uses pre-tax contributions with tax-deferred growth. The Roth version uses after-tax contributions now, but qualified withdrawals come out completely tax-free. You own the account, not your employer, so it follows you between jobs.
The 2026 contribution limit for a 401(k) is $24,500 for those under 50, plus a $8,000 catch-up for age 50 and older. The IRA limit is $7,500 for under 50, with a ];,100 catch-up for 50-plus. The IRA ceiling is shared across all your IRAs combined, but 401(k) and IRA limits are separate — you can max both.
Income phaseouts matter for Roth IRAs. Single filers see their contribution ability shrink between ];53,000 and ];68,000 of modified adjusted gross income in 2026, and disappear entirely above ];68,000. Married filing jointly runs from $242,000 to $257,000. Traditional IRA deductibility also phases out at higher incomes if you're covered by a workplace plan.
Investment menus differ too. A 401(k) typically offers a curated list of mutual funds and target-date funds — solid, but limited. An IRA opened at a brokerage gives you access to thousands of mutual funds, ETFs, and individual securities. More choice, more responsibility.
The big strategic question isn't 401(k) or IRA — it's how to use both. Layering accounts gives you tax diversification: some money taxed now, some taxed later, some never taxed again.
The Math
Imagine Sarah, 32, earning $85,000. She puts ];,000 into a Roth IRA at a 7% average annual return and leaves it for 33 years until age 65.
Future value: ];,000 × (1.07)^33 = ];0,676.
Now imagine she skips the IRA and stuffs the same ];,000 into a taxable brokerage account instead. At the same 7% return, but with a 15% annual drag from taxes on dividends and realized gains, the balance grows to roughly $5,500. Same starting money, same time horizon, dramatically different outcome.
Why the gap compounds. Years of tax efficiency snowball into decades of tax efficiency. That $5,176 difference isn't one year's return — it's the result of letting every dollar keep working instead of losing chunks to the IRS each year. Multiply that across decades of contributions and you're looking at six-figure swings in your final balance. Our Retirement Calculator runs this for your exact numbers.
| Feature | 401(k) | Roth IRA | Traditional IRA |
|---|---|---|---|
| 2026 Contribution Limit (under 50) | $24,500 | $7,500 | $7,500 |
| Catch-up (50+) | $8,000 | ];,100 | ];,100 |
| Employer Match | Yes (typical) | No | No |
| Tax Treatment | Pre-tax (or Roth) | After-tax in, tax-free out | Pre-tax in, taxed out |
| Income Limits (2026) | None | ];68K single / $257K MFJ | Deductibility phases out |
| Withdrawal Age | 59½ (no penalty) | 59½ (qualified) | 59½ (no penalty) |
| Required Distributions | Yes (RMDs) | No (during owner lifetime) | Yes (RMDs) |
Step-by-Step
- Capture the full match. Contribute at least enough to your 401(k) to get every dollar of employer match. Skipping the match is leaving free money on the table. If your employer matches 100% up to 3% of salary, that's an instant 100% return on your contribution.
- Open a Roth IRA next. Once the match is locked in, open a Roth IRA and contribute up to $7,500 for 2026. Use it for long-term investments you expect to grow significantly, since the tax-free withdrawal is most valuable on big gains.
- Go back and finish maxing the 401(k). With your IRA funded, return to the 401(k) and work toward the $24,500 limit. Pre-tax contributions lower your current tax bill, which can improve your cash flow today.
- Mind the income phaseouts. If your salary pushes you above the Roth IRA threshold, consider a "backdoor Roth" — contribute to a nondeductible traditional IRA, then convert to Roth. It works in most cases, though watch the pro-rata rule if you have other IRA money. Our Roth IRA Calculator shows your after-tax retirement balance.
Common Mistakes
Ignoring the match. Plenty of workers contribute below the match threshold because they'd rather invest the difference in an IRA. The math almost never supports this. A 50% employer match beats almost any tax benefit you can find elsewhere. Always, always get the full match first.
Cashing out a 401(k) when changing jobs. Rolling a $25,000 401(k) into a new employer's plan or an IRA preserves the full balance. Cashing out triggers federal tax, a 10% early-withdrawal penalty if you're under 59½, and state taxes. On $25,000, you could lose $8,000 or more to penalties and taxes alone.
Forgetting about RMDs. Traditional 401(k)s and traditional IRAs require minimum withdrawals starting at age 75 (under SECURE Act 2.0 rules). Miss an RMD and the penalty is 25% of the amount you should have withdrawn. Roth IRAs have no RMDs during your lifetime — another point in their column for estate planning.
Frequently Asked Questions
What is the difference between a 401(k) and an IRA?
A 401(k) is an employer-sponsored plan with higher annual limits ($24,500 in 2026) and often an employer match. An IRA is an account you open yourself with lower limits ($7,500) but broader investment choices and no employer involvement.
How does a Roth IRA differ from a traditional IRA?
A Roth IRA is funded with after-tax dollars, so qualified withdrawals after 59½ are completely tax-free. A traditional IRA uses pre-tax dollars now, but withdrawals are taxed as ordinary income. Roth IRAs have income limits; traditional IRAs have deductibility limits for high earners with workplace plans.
When should I choose a 401(k) over an IRA?
Choose the 401(k) first if your employer offers a match, since that's immediate return on your money. The 401(k) also wins when you want higher contribution limits, pre-tax tax breaks now, or you're above the Roth IRA income phaseout range.
Is it smart to have both a 401(k) and an IRA?
Yes, and most retirement planners recommend it. Combining accounts gives you tax diversification — some money taxed now, some taxed later, some never taxed again. Use the 401(k) Calculator and our IRA Calculator to model your combined trajectory, and the Retirement Calculator to see your full picture.
Run the numbers yourself: Retirement Calculator