The question "IRA or 401(k)?" is usually framed as a choice, but for most people the better question is "in what order?" The two account types complement each other. Used together optimally, they can shelter far more income from taxes than either can alone. Understanding the differences between them is the starting point for building a retirement savings strategy that actually maximizes what you keep.
Side-by-Side Comparison
| Feature | 401(k) | IRA (Traditional or Roth) |
|---|---|---|
| 2025 contribution limit | $23,500 ($31,000 if 50+) | $7,000 ($8,000 if 50+) |
| Employer match | Yes (many employers) | No |
| Investment options | Limited to plan menu (often 15–30 funds) | Unlimited ??? any stock, ETF, bond, mutual fund |
| Setup | Through employer only | Open at any brokerage |
| Fees | Often higher (plan admin fees) | Can be very low (index fund ETFs) |
| Income limits | None to contribute | Roth has phase-outs; traditional deduction has limits |
| Loans allowed | Often yes (inadvisable) | No loans allowed |
| RMDs | Required at 73 (traditional) | Roth IRA: no RMDs during lifetime |
The 401(k) Advantages
The employer match ??? non-negotiable first priority
If your employer offers a matching contribution, the 401(k) is the first place every retirement dollar should go ??? up to the match limit. A 50% match on the first 6% of salary is a guaranteed 50% return on those dollars before a single investment gain is earned. No IRA can replicate this. Failing to capture the full match is the most expensive retirement mistake most people make.
Much higher contribution limit
At $23,500 versus $7,000, a 401(k) allows you to shelter more than three times as much income from taxes each year. For high earners trying to maximize tax-advantaged savings, the 401(k)'s higher limit is decisive.
Automatic payroll deduction
Contributions happen automatically before you see the money. This is behaviorally powerful ??? you can't spend money that never hits your checking account.
The IRA Advantages
Investment freedom
A 401(k) limits you to the funds your employer's plan offers ??? often a modest menu with varying quality and expense ratios. An IRA at a brokerage like Fidelity, Vanguard, or Schwab gives you access to the entire universe of investments: individual stocks, any ETF, low-cost index funds, bonds, REITs, and more. This flexibility lets you minimize fees and construct exactly the portfolio you want.
The Roth IRA's unique advantages
The Roth IRA has features no 401(k) can match:
- No required minimum distributions ??? Roth IRAs are not subject to RMDs during your lifetime, making them exceptional for estate planning and tax-efficient retirement income management
- Tax-free growth and withdrawals ??? Contributions are after-tax, but qualified withdrawals in retirement are completely tax-free ??? including all the decades of gains
- Contribution flexibility ??? You can withdraw your contributions (not earnings) at any time without penalty, making a Roth IRA a hybrid retirement account / flexible savings vehicle
Traditional vs. Roth: The Tax Timing Decision
Both 401(k)s and IRAs come in traditional and Roth versions. The choice between them is a bet on your future tax rate:
| Traditional | Roth | |
|---|---|---|
| Tax benefit timing | Now (deduction reduces taxable income today) | Later (withdrawals tax-free in retirement) |
| Choose if you expect | Lower tax rate in retirement | Higher tax rate in retirement |
| Best for | High earners in peak years; near retirement | Early career; expecting higher future income |
| Hedge strategy | Contribute to both ??? splits tax risk across future and present | |
The Priority Order That Works for Most People
The question isn't IRA or 401(k) ??? it's sequencing. Here's the order that maximizes tax advantages and guaranteed returns:
- 401(k) up to the full employer match ??? Capture every free dollar. Stop here if you can only afford one step.
- Max out a Roth IRA ($7,000) ??? Investment freedom, no RMDs, tax-free growth. Use this before going back to the 401(k) if you're in a lower bracket now and expect to be in a higher one later.
- Return to the 401(k) and maximize ??? If you have more to invest after steps 1 and 2, increase 401(k) contributions toward the $23,500 limit.
- Taxable brokerage account ??? Once all tax-advantaged space is filled, invest in a taxable account. Less efficient tax-wise, but no limits and no restrictions.
What If Your 401(k) Plan Is Bad?
Some 401(k) plans have limited, high-fee fund options that significantly drag on returns. If your plan's lowest-cost option has an expense ratio above 0.5–1%, the plan is suboptimal. In this case:
- Still contribute enough to capture the full employer match (the match overcomes most fee disadvantages)
- Then prioritize the IRA before returning to the 401(k) beyond the match
- Consider advocating internally for better fund options ??? many companies have upgraded their plans when employees pushed for it
Project Your Retirement Balance
Model how different contribution amounts across 401(k) and IRA accounts grow over time with the Retirement Calculator.
Traditional vs Roth: Know Your Bracket
Whether to contribute pre-tax (traditional) or post-tax (Roth) depends on your current vs expected future tax bracket. The Tax Bracket Calculator shows your marginal rate and the exact cost of going Roth this year.