IRAs and 401(k)s are both tax-advantaged retirement accounts, and the tax benefits work similarly. The main differences come down to who sponsors them, how much you can contribute, and the level of control you have over your investment choices.
For most people, the right answer isn’t to choose between them — it’s to use both. They serve different purposes and complement each other well. The rest of this article walks through how each one works, where they overlap, where they differ, and how to use them together.
What a 401(k) is
A 401(k) is an employer-sponsored retirement plan. Contributions come directly out of your paycheck, before taxes are calculated (for traditional 401(k) contributions) — reducing your current taxable income. The money grows tax-deferred, and you pay ordinary income tax on withdrawals in retirement.
Most plans also offer a Roth 401(k) option, where contributions are made with after-tax dollars (no current deduction) but qualified withdrawals in retirement are entirely tax-free.
Key features:
- 2026 contribution limit: $24,000 per year, plus a $7,500 catch-up contribution if you’re 50 or older (totals subject to annual updates)
- Employer match: Many employers match a percentage of your contributions — commonly 3–6% of salary. This is essentially free money you should always claim if available
- Investment menu: Limited to whatever funds your employer’s plan offers. Most plans have 10–30 fund options — some excellent, some expensive
- Loans and hardship withdrawals: Some 401(k) plans allow you to borrow from your balance for specific purposes
- Vesting: Employer match contributions may have a vesting schedule — you have to stay employed for a set period before the matched money fully belongs to you. Your own contributions are always 100% yours
What an IRA is
An IRA — Individual Retirement Account — is a retirement account you open and control yourself, typically at a brokerage like Fidelity, Vanguard, or Schwab. There’s no employer involved.
You can hold almost any investment in an IRA: individual stocks, bonds, mutual funds, ETFs, even some alternative assets. The two main types are traditional and Roth, with the same general tax distinctions as 401(k)s.
Key features:
- 2026 contribution limit: $7,000 per year, plus a $1,000 catch-up if you’re 50 or older
- Investment freedom: Nearly any publicly available investment is available, not just a curated employer menu
- No employer match: What you put in is what gets invested
- Income limits for Roth IRAs: If your income exceeds certain thresholds, you can’t contribute directly to a Roth IRA — though a “backdoor Roth” conversion can still be available
- Income limits for traditional IRA deductibility: If you’re covered by a workplace retirement plan and earn above certain thresholds, your traditional IRA contributions may not be tax-deductible — you can still contribute, but the tax benefit is reduced
Traditional vs. Roth: same idea in both account types
Both 401(k)s and IRAs come in traditional and Roth flavors. The trade-off is when you pay taxes:
- Traditional: Tax break now (deductible contributions); pay ordinary income tax on withdrawals later. Better when your current tax rate is higher than your expected rate in retirement
- Roth: No tax break now; tax-free growth and tax-free withdrawals in retirement. Better when your current tax rate is lower than your expected rate in retirement — or when you want flexibility from having tax-free dollars available later
Many people use both: traditional contributions during high-earning years for the immediate deduction, Roth contributions during lower-earning years (early career, after a job loss, in semi-retirement) for the tax-free growth. The goal is tax diversification — having pre-tax and after-tax pools of retirement money to draw from strategically later.
Side-by-side comparison
- Contribution limit: 401(k) is much higher ($24,000 vs. $7,000) — the 401(k) is the heavyweight account for high-savers
- Employer match: Only available in 401(k)s — typically the most valuable feature
- Investment options: IRAs offer wider choice; 401(k)s are limited to plan menu
- Fees: Varies. Some 401(k)s have excellent low-cost funds; others have only expensive options. IRAs at major brokerages can hold very low-cost index funds
- Income limits: 401(k)s have no income limits for contribution. Roth IRAs have income phase-out limits; traditional IRA deductibility is also income-limited if you have a workplace plan
- Loans: Available from some 401(k)s, never from IRAs
- RMDs: Both traditional 401(k)s and traditional IRAs require minimum distributions starting at age 73. Roth IRAs do not require RMDs during the original owner’s lifetime; Roth 401(k)s no longer require RMDs as of 2024
How to use both
A workable order of operations for most savers:
- Step 1: Capture the full 401(k) match. Contribute at least enough to your 401(k) to get every dollar of employer match. This is the highest-return investment available to you — often a 100% return on the match
- Step 2: Fund a Roth IRA (or traditional IRA if you prefer the immediate deduction and aren’t over the deductibility limit). $7,000/year goes directly into low-cost investments of your choice. The IRA gives you tax diversification and broader investment options than most 401(k) plans
- Step 3: Continue contributing to the 401(k) up to the annual limit. $24,000/year is a substantial savings rate for most people, and the contributions reduce current-year taxable income (for traditional contributions)
- Step 4: Use a taxable brokerage account for any further savings. No tax benefits, but no contribution limits and full liquidity
This order maximizes the most valuable benefit (employer match), captures broad investment freedom (IRA), and only commits to the larger 401(k) limit after the IRA is funded. For people with high incomes who can’t deduct traditional IRA contributions or contribute directly to a Roth IRA, the order may shift — but the principle is the same: stack the tax-advantaged buckets you have access to.
When to roll over a 401(k) to an IRA
When you leave an employer, you typically have four options for your 401(k) balance:
- Leave it in the old plan (if the plan allows and the balance is large enough)
- Roll it to your new employer’s 401(k) (if the new plan accepts rollovers)
- Roll it to a traditional IRA at a brokerage of your choice
- Cash it out — almost always a bad idea due to taxes and the 10% early withdrawal penalty if under 59½
Rolling to an IRA gives you broader investment options and potentially lower fees, but you lose the “backdoor Roth” flexibility (the IRA balance complicates that strategy due to pro-rata rules). If your old 401(k) has excellent low-cost funds, leaving it there is fine. If it has expensive funds, rolling to an IRA usually saves money over time.
Common mistakes
- Not contributing enough to get the full 401(k) match. Walking past free money. The single most common retirement saving mistake
- Holding employer stock as a large portion of your 401(k). Concentration risk — if your employer hits trouble, you can lose your job and your retirement savings simultaneously
- Cashing out a 401(k) when changing jobs. Triggers immediate tax plus a 10% penalty if under 59½, and resets the compounding clock
- Not using an IRA on top of a 401(k). The two stack — you can fund both in the same year
- Ignoring fund fees in the 401(k). A 1% expense ratio over 30 years can cost you 25% or more of your final balance vs. a 0.05% index fund alternative
Bottom line
IRAs and 401(k)s aren’t alternatives — they’re complements. The 401(k) provides the bulk of contribution capacity and the all-important employer match. The IRA provides investment freedom, tax diversification, and a place for additional retirement savings beyond the workplace plan.
Use both if you can. Capture the 401(k) match first, fund the IRA second, max out the 401(k) third. That sequence captures most of what these accounts have to offer for most savers, most of the time.
Further Reading
- 401(k) for Beginners
- ETFs Explained
- Mutual Funds vs. ETFs
- Target-Date Funds Explained
- Index Funds vs. Actively Managed Funds
- Roth Conversions Explained
This article is for general educational purposes only and does not constitute tax or investment advice. Contribution limits and tax rules change — verify current figures at irs.gov or with a tax professional.