These three accounts solve the same problem — saving for retirement with a tax advantage — but the advantage shows up at a different point in time for each one. Understanding that timing difference is really the entire decision.
The Core Difference in One Sentence Each
- Traditional IRA: You may get a tax deduction now; you pay ordinary income tax on withdrawals in retirement.
- Roth IRA: You get no deduction now; qualified withdrawals in retirement, including all investment growth, are completely tax-free.
- 401(k): An employer-sponsored plan (traditional or Roth version) with a much higher contribution limit, often paired with an employer match.
2026 Contribution Limits
| Account | Under 50 | 50 and older |
|---|---|---|
| Traditional IRA + Roth IRA (combined) | $7,500 | $8,600 |
| 401(k) employee contribution | $24,500 | $32,500 |
| 401(k) “super catch-up” (ages 60–63) | — | $35,750 |
The IRA limit is a single combined cap — you cannot contribute $7,500 to a Traditional IRA and another $7,500 to a Roth IRA in the same year. The 401(k) limit is separate and much higher, and applies per employer plan.
Traditional IRA: The Deduction Isn’t Always Automatic
This is the detail most comparisons oversimplify. Whether your Traditional IRA contribution is deductible depends on whether you (or your spouse) are covered by a workplace retirement plan:
- Not covered by any workplace plan: Your full contribution is deductible regardless of income.
- Covered by a workplace plan: For 2026, the deduction phases out between $81,000–$91,000 MAGI (single filers) or $129,000–$149,000 MAGI (married filing jointly).
- Not covered yourself, but your spouse is: A more generous phase-out applies — $242,000–$252,000 MAGI.
If your income is above the relevant threshold, you can still contribute to a Traditional IRA — it simply becomes a nondeductible contribution, reported on IRS Form 8606, and only the growth is taxed on withdrawal rather than the original contribution.
Roth IRA: No Deduction, But an Income Ceiling
Roth IRA eligibility has nothing to do with workplace plan coverage — it’s based purely on income. For 2026, you can make a full contribution if your MAGI is under $153,000 (single) or $242,000 (married filing jointly), with contributions phasing out completely at $168,000 and $252,000 respectively. Notice these thresholds are considerably higher than the Traditional IRA deduction limits — plenty of people earn too much to deduct a Traditional IRA contribution but still qualify for a full Roth contribution.
401(k): The Employer Match Changes the Math Entirely
A 401(k)’s biggest advantage isn’t the contribution limit — it’s the employer match, when offered. An employer match is, in effect, an immediate and guaranteed return on your contribution before any investment growth even happens. For that reason, the conventional order of operations most planners recommend is:
- Contribute enough to your 401(k) to capture the full employer match (leaving free money on the table otherwise makes little sense).
- Max out an IRA (Traditional or Roth, based on your tax situation) for the lower fees and wider investment selection IRAs typically offer compared to a workplace plan’s fund lineup.
- Return to the 401(k) and contribute up to its higher annual limit if you still want to save more.
Roth vs Traditional: How to Actually Decide
The simplified version most people hear — “Roth if you expect to be in a higher tax bracket in retirement, Traditional if you expect a lower one” — is directionally correct but incomplete. Also worth weighing:
- Roth IRAs have no Required Minimum Distributions (RMDs) during the original owner’s lifetime, which matters if you want flexibility on when you withdraw or want to leave the account to heirs.
- Tax diversification has value on its own. Holding both Roth and Traditional money gives you flexibility in retirement to control your taxable income year to year — withdrawing more from the Roth in a high-income year, more from the Traditional account in a low-income year.
- A high earner blocked from a direct Roth contribution can still use a backdoor Roth conversion strategy, though this involves additional tax reporting and is more complex if you already hold other pre-tax IRA balances (the pro-rata rule).
Which One Should You Prioritize?
If your employer offers a match, capture it first — that’s rarely a close call. Beyond that, a Roth IRA tends to make sense for younger earners or anyone in a lower tax bracket today who expects to earn more later, while a Traditional IRA’s deduction is most valuable for higher earners currently in a high tax bracket who expect a lower one in retirement. Since you can hold all three account types simultaneously and each has a distinct role, the more common real-world approach for someone with access to a 401(k) match isn’t choosing one — it’s sequencing all three in the order above and adjusting the Roth-versus-Traditional split as income changes from year to year.
Disclosure: This article is for educational purposes only and does not constitute financial or tax advice. We are not licensed financial advisors. Contribution limits and income thresholds reflect IRS guidance for the 2026 tax year and are subject to change — verify current figures directly with the IRS or a tax professional before making decisions. Some links on this page may be affiliate links.
Last reviewed: July 2026.