IRA vs. 401(k): The Differences, and Which One to Fund First
By the Stoia team · September 7, 2026 · 5 min read
A 401(k) is retirement savings you get through an employer; an IRA is retirement savings you open yourself. That single difference explains almost everything else about them: who picks the funds, who sets the fees, how much you can contribute, and whether anyone matches it. "Which one" turns out to be the wrong question. The useful one is "in what order."
Two accounts, one purpose
Both are tax-advantaged containers for retirement money, and both come in a traditional (pre-tax) and a Roth (after-tax) flavor. A 401(k) is sponsored by your employer, run by a plan administrator the employer chose, and funded straight from payroll. An IRA is an account you open on your own with any custodian you like and fund from your bank account. Everything else on the comparison follows from who is in charge.
The comparison
| 401(k) | IRA | |
|---|---|---|
| Who sets it up | Your employer | You |
| Employer match | Often, and it is the main reason to use one | Never |
| Annual contribution limit | Several times larger than an IRA's | Much smaller; the two limits are separate, not shared |
| Investment choices | The plan's menu, often 10–30 funds | Nearly anything: index funds, ETFs, individual stocks, bonds, CDs |
| Fees | Plan administration fees plus fund expenses, set by the employer | Fund expenses you choose; many custodians charge no account fee |
| Income limits | None for contributing | Roth contributions and traditional deductibility phase out at higher incomes |
| Loans | Usually allowed | Not allowed |
| Early access | Penalty-free after leaving the job in or after the year you turn 55 | Roth contributions withdrawable anytime; broader penalty exceptions (education, a first home) |
| Creditor protection | Strong federal protection | Varies by state, generally weaker |
| Portability | Roll to a new plan or an IRA when you leave | Already yours; stays put through job changes |
Read the first three rows together and the case for the 401(k) is clear: free money and a large limit. Read the next three rows and the case for the IRA is just as clear: your choice of investments, your choice of costs, and no dependence on how good your employer's plan happens to be.
The order of operations
The standard sequence combines the strengths and avoids the weaknesses of each. It assumes the basics are in place first, a starter emergency fund and no high-interest card debt, which is the subject of save or invest first.
- Contribute to the 401(k) up to the full employer match. A match is an immediate return on your contribution that no investment can compete with; leaving it unclaimed is the most expensive mistake in retirement saving. Not one dollar past the match yet.
- Fill an IRA up to its annual limit. Roth if you qualify and prefer tax-free growth, traditional if you want the deduction and are eligible for it. Here you get the full investment universe at the lowest cost you can find.
- Go back to the 401(k) and keep contributing toward its much larger limit. Its fund menu may be narrower, but the tax shelter is the same and the payroll automation makes it effortless.
- Then a health savings account if you are eligible, then a taxable brokerage account. Both are beyond this guide, but they are where the sequence continues.
If your plan is unusually good, low fees and a strong index lineup, steps 2 and 3 can swap without much loss. If the plan is poor, the IRA step matters more, and the plan still earns its place at step 1 for the match alone.
Two situations break the sequence. Without a workplace plan at all, the IRA is step one by default, and self-employed savers have their own plan types that restore the larger limit. With a plan that offers no match, step one disappears and the IRA moves to the front on cost grounds alone, with the plan taking over once the IRA is full.
Fees and fund menus, the quiet difference
Plan quality varies enormously. A good 401(k) offers broad index funds with expense ratios measured in hundredths of a percent and charges little or nothing for administration. A poor one offers a short menu of actively managed funds and layers on administrative charges that can push the all-in cost past 1% a year. That difference sounds small and is not: over a career it can consume a fifth or more of the final balance. The investment fee calculator shows the dollar cost of a fee gap on your own contributions and horizon. In an IRA, the expense ratio is whatever you choose it to be, which is the strongest argument for putting the IRA ahead of the un-matched part of the plan. Your plan's fee disclosure, which it must provide, tells you which kind of plan you have.
When you have both
Most people eventually do, and the two interact in three ways worth knowing. First, being covered by a workplace plan is what triggers the income phase-out on deducting a traditional IRA contribution; you can still contribute, but above a certain income the deduction shrinks and then disappears, at which point a Roth IRA (if you qualify) or a nondeductible contribution followed by a conversion, the backdoor Roth, is the usual route. Second, the limits are independent: maxing the 401(k) does not reduce what you can put in an IRA. Third, an old 401(k) becomes a decision when you leave a job: leave it, roll it into the new employer's plan, or roll it into an IRA, where the trade is better fund choice and fees against the plan's stronger creditor protection, its loan feature, and the fact that pre-tax IRA balances complicate a future backdoor Roth.
A worked year
Salary $70,000; the plan matches half of contributions up to 6% of pay. Step one is contributing 6%, or $4,200, which draws a $2,100 match: $6,300 into the plan for $4,200 of your money. Step two is funding an IRA up to the annual limit; the IRA calculator carries the current limit and projects what those contributions grow into tax-free. Step three sends whatever is left of the savings target back into the plan, and the 401(k) calculator shows the combined balance that contribution rate plus match produces by retirement. Someone saving 15% of pay in this setup ends up with money in both accounts, a match captured in full, and their IRA dollars in the cheapest funds available to them.
Two accounts, one goal, and the only number that matters is the total. Keeping the plan balance and the IRA balance in one view is how the order of operations stays a plan instead of a memory.