If you have a limited amount to invest for retirement, the order in which you fill these accounts matters more than which one is "better" in the abstract. Here's a clear priority sequence that works for most people in 2026.
If your employer matches 401(k) contributions, that match is an immediate, guaranteed 50–100% return — nothing else in investing comes close. Contribute at least enough to get the entire match before doing anything else. Leaving match on the table is turning down free salary.
The core difference is when you pay taxes:
A useful rule: if you're early in your career or in the 12–22% federal bracket, Roth is usually the smart choice — you're locking in a low tax rate now and never paying tax on decades of growth. High earners in the 32–37% bracket often prefer traditional to get the deduction today.
| Priority | Account |
|---|---|
| 1 | 401(k) up to the full employer match |
| 2 | Roth IRA (up to the annual limit) |
| 3 | Back to 401(k) up to the annual limit |
| 4 | Taxable brokerage account |
The Roth IRA sits second because it offers tax-free growth, more investment choices than most 401(k)s, and flexibility (you can withdraw your contributions — not earnings — penalty-free if truly needed).
Because of compounding, the dollars you invest in your 20s and 30s do far more work than dollars invested later. Even $200/month started early can outgrow much larger contributions started a decade later. The account type matters, but the habit of contributing consistently matters more.
See how much your contributions could grow with tax-advantaged compounding.
Compound Interest Calculator →Yes. They have separate contribution limits, so you can max both in the same year if your budget allows. Many savers use the 401(k) for the match and higher limit, and a Roth IRA for tax-free growth and flexibility.
Roth IRAs have income limits. High earners above the threshold can often use a 'backdoor Roth' (contributing to a traditional IRA and converting), or simply use a Roth 401(k) if their employer offers one, which has no income limit.
Yes. A Roth 401(k) is offered through your employer, has a much higher contribution limit, and can receive employer match (though the match itself is pre-tax). A Roth IRA is opened on your own with more investment freedom but a lower limit and income restrictions.