Both a 401(k) and an IRA are tax-advantaged retirement accounts, but they differ in who administers them, how much you can contribute, and what investments are available. A 401(k) is sponsored by your employer and offers higher contribution limits; an IRA is opened by you individually and typically offers more investment flexibility. Most savers should prioritize both — in the right order.
Employer-sponsored — administered by a plan provider (Fidelity, Vanguard, Schwab, etc.)
Higher limits and employer match — but limited to your employer's investment menu.
Pros
Individual-opened — at a brokerage, bank, or robo-advisor of your choice
Open-universe investment flexibility — Roth or traditional, at any brokerage.
Pros
| Spec | 401(k) Plan | IRA (Individual Retirement Account) |
|---|---|---|
| Best for | Employees with access to an employer 401(k), especially those with an employer match — always contribute at least enough to capture the full match. | Savers who have already captured their employer 401(k) match and want additional tax-advantaged retirement savings with maximum investment flexibility. |
◈ marks the stronger option for that row.
Pick 401(k) Plan if: Employees with access to an employer 401(k), especially those with an employer match — always contribute at least enough to capture the full match.
Pick IRA (Individual Retirement Account) if: Savers who have already captured their employer 401(k) match and want additional tax-advantaged retirement savings with maximum investment flexibility.
IRS 401(k) guidance →IRS IRA guidance →
The standard financial planning priority order: (1) Contribute to your 401(k) up to the full employer match — this is an instant 50–100% return; (2) Max your IRA (Roth if eligible, for tax-free growth); (3) Return to your 401(k) and contribute up to the annual limit if you have more to save. If your 401(k) has poor investment options or high fees, some advisors suggest stopping after the match and prioritizing IRA up to the limit before returning to the 401(k). Source: IRS contribution guidance at irs.gov.
In 2026, you can contribute up to $23,500 to a 401(k) ($31,000 if age 50+) and $7,000 to an IRA ($8,000 if age 50+). These limits are independent — you can max both in the same year for a combined $30,500 ($39,000 at 50+). The IRA limit is combined across all your IRAs (you can't contribute $7,000 to a Roth AND $7,000 to a traditional IRA in the same year). Source: IRS Rev. Proc. 2025-18 at irs.gov — verify annually.
Yes. There is no rule preventing you from contributing to both a 401(k) and an IRA in the same year, subject to each account's individual contribution limits and income rules. In fact, contributing to both (in the priority order above) is the recommended approach for most savers who can afford to do so. The deductibility of traditional IRA contributions phases out at higher incomes when you have access to a workplace plan, but Roth IRA contributions (and backdoor Roth conversions) remain available regardless. Source: IRS Publication 590-A at irs.gov.
A Roth 401(k) is a workplace retirement plan that accepts after-tax contributions — you pay income tax on the money going in, but qualified withdrawals in retirement (including earnings) are tax-free. A traditional 401(k) accepts pre-tax contributions, reducing your taxable income today, but withdrawals in retirement are taxed as ordinary income. Both types have the same contribution limits ($23,500 / $31,000 in 2026). Roth 401(k)s are now subject to no required minimum distributions during the owner's lifetime under the SECURE 2.0 Act (effective 2024). Source: IRS at irs.gov.
Yes. When you leave an employer, you can roll over your 401(k) balance into a traditional IRA (for traditional 401(k) funds) or a Roth IRA (for Roth 401(k) funds, with any pre-tax amounts subject to tax at conversion). A direct rollover — where funds transfer institution-to-institution — avoids the 20% mandatory withholding that applies to indirect rollovers. Rolling to an IRA gives you broader investment choices than most employer plans. Alternatively, you can roll into a new employer's 401(k) if that plan accepts rollovers. Source: IRS rollover guidance at irs.gov.
Withdrawals before age 59½ from a traditional 401(k) or traditional IRA are generally subject to ordinary income tax plus a 10% early withdrawal penalty. Roth IRA contributions (not earnings) can be withdrawn at any time without tax or penalty. Roth earnings withdrawn before 59½ or before the account has been open 5 years are subject to tax and the 10% penalty. Both account types have exceptions to the penalty for hardship withdrawals, disability, substantially equal periodic payments (SEPP/72(t)), first-time home purchase (IRA only, $10K lifetime), and qualifying higher education expenses (IRA only). Source: IRS Publication 590-B at irs.gov.
A backdoor Roth IRA is a two-step strategy for high-income earners who exceed the Roth IRA direct contribution income limits ($150K–$165K single / $236K–$246K MFJ phase-out in 2026): (1) make a non-deductible contribution to a traditional IRA (no income limit applies to contributions, only to deductibility), then (2) immediately convert that balance to a Roth IRA. The conversion is taxable only on any earnings between contribution and conversion — if done promptly, the tax is typically minimal. Caveat: if you have other pre-tax IRA balances (SEP-IRA, SIMPLE IRA, rollover IRA), the pro-rata rule applies and a portion of the conversion becomes taxable. Source: IRS Publication 590-A at irs.gov.
Required minimum distributions (RMDs) are mandatory annual withdrawals from tax-deferred retirement accounts starting at age 73 under SECURE 2.0 (effective 2023). Traditional 401(k) and traditional IRA accounts are both subject to RMDs. Roth IRAs have no RMDs during the owner's lifetime — a significant estate planning advantage, as Roth assets can compound tax-free indefinitely. Roth 401(k) accounts are also no longer subject to RMDs during the owner's lifetime under SECURE 2.0 (effective 2024). The RMD amount is calculated annually by dividing the prior year-end account balance by an IRS life expectancy factor. Failure to take RMDs triggers a 25% excise tax on the shortfall. Source: IRS Publication 590-B at irs.gov.
A SEP-IRA (Simplified Employee Pension) is a tax-deferred retirement account for self-employed individuals and small business owners. In 2026, SEP-IRA contributions can be up to 25% of net self-employment income, up to a maximum of approximately $70,000 — far exceeding the $23,500 employee-elective limit in a 401(k). SEP-IRAs require no plan documents or annual IRS filings, making them simple to open. Unlike a solo 401(k), a SEP-IRA has no employee-elective deferral component and no Roth option. If you have employees, SEP contributions must be made at the same percentage rate for all eligible employees. Source: IRS Publication 560 at irs.gov — verify current limits annually.
IRA contributions require earned income (wages, salary, self-employment income). You cannot contribute more than your earned income for the year, up to the annual limit ($7,000 / $8,000 at 50+ in 2026). If you have no earned income — for example, you are retired and living on Social Security, investment income, or RMDs — you cannot make new IRA contributions. Exception: a non-working spouse may contribute to a spousal IRA based on the working spouse's earned income, subject to the same annual limits, as long as you file a joint federal tax return. Source: IRS Publication 590-A at irs.gov.
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