How this page is reviewed
See methodology, assumptions & sources
| Risk tier | YMYL |
|---|---|
| Author | Calculover Editorial Team Finance education |
| Editorial owner | Calculover Investing & Retirement Desk Retirement methodology owner |
| Reviewer | Calculover Editorial Review Source and limitation review |
| Last reviewed | 2026-06-21 |
| Last verified | 2026-06-21 |
| Data effective date | 2026-06-21 |
Methodology
Roth IRA vs 401(k): Which to Fund First compares Roth IRA and 401(k) using the figures you enter — including 2026 contribution limit, employer match, tax treatment, 2026 income limit to contribute — to show which option costs less, when each one is the better choice, and the break-even between them. The embedded calculators run your own numbers so the comparison reflects your situation, not a generic example.
Assumptions
- All rates, balances, contributions, and timelines are user-supplied; defaults are illustrative round numbers, not quotes.
- Regulatory figures cited (2026 IRS limits, tax brackets, and similar) reflect published federal values for the stated year.
- Results assume the inputs hold over the chosen horizon and do not model every individual circumstance.
Limitations
- This page does not predict future interest rates, returns, tax law, or prices, and is not a substitute for personalized professional advice.
- Fees, credit-tier pricing, eligibility rules, and state-specific differences can materially change the outcome for your situation.
Sources
- Retirement Plans, Internal Revenue Service
- Retirement Topics — IRA & 401(k) Limits, Internal Revenue Service
- Saving and Investing, Investor.gov (U.S. SEC)
Professional guidance: This page is for retirement-planning education only and is not investment, tax, or fiduciary advice. Confirm contribution limits, income rules, and tax treatment with a licensed financial professional.
The funding order that actually builds wealth
The smartest answer to "Roth IRA or 401(k)?" is usually both, in a specific order. Personal-finance planners call it the contribution waterfall, and it puts free money first:
- 401(k) up to the full employer match. If your company matches 50% of contributions up to 6% of pay, that's an instant 50% return — nothing else in investing comes close.
- Max a Roth IRA ($7,500 in 2026). Tax-free growth, no required withdrawals, and you can pull your contributions out penalty-free.
- Back to the 401(k) until you hit the $24,500 limit, or as much as your budget allows.
On an $80,000 salary, a 50% match on a 6% contribution is $2,400 of free money every single year. Skip the match to fund a Roth IRA first and you leave that $2,400 on the table — the one mistake this order is designed to prevent.
Roth IRA vs 401(k): the tax trade-off
A traditional 401(k) gives you the deduction now and taxes the withdrawals later. A Roth IRA does the reverse: you pay tax on the contribution today and never again. If your tax rate were identical in both years, the two would produce the same after-tax dollars on an equal contribution — the math is symmetric.
The edge comes from where the rates differ. A Roth wins if you'll be in a higher bracket in retirement (or think rates will rise). A traditional 401(k) wins if you're in your peak earning years now and expect a lower bracket later. Because nobody knows future tax law, holding both gives you a tax hedge — the ability to draw from whichever bucket is cheaper each year.
2026 contribution limits and income rules
For 2026 the IRS set the 401(k)/403(b)/457 employee limit at $24,500, with an $8,000 catch-up at age 50+ (and a higher $11,250 catch-up for ages 60–63). The Roth and traditional IRA limit is $7,500, plus a $1,100 catch-up at 50+.
Roth IRAs have an income ceiling: in 2026 the ability to contribute phases out between $153,000 and $168,000 for single filers and $242,000 and $252,000 for married couples filing jointly. Above those ranges, high earners use a "backdoor Roth" — a nondeductible traditional IRA contribution converted to Roth. A 401(k) has no income limit at all.
A real example: $80,000 salary, 25 years
Say you earn $80,000, your employer matches 50% up to 6%, and you also max a Roth IRA. You contribute 6% ($4,800), the match adds $2,400, and the Roth IRA adds $7,500 — $14,700 a year in total.
At a 7% average return, that grows to roughly $930,000 over 25 years. About $152,000 of that balance is pure employer match — money you'd forfeit entirely by funding the Roth IRA first and skipping the 401(k) match. Run your own salary, match formula, and timeline in the calculators below.