401(k) vs IRA: Which Retirement Account Should You Fund First?

If you have a 401(k) at work and you also qualify for an IRA, you are staring at one of the most common — and most consequential — questions in personal finance: which one do I fund first? The wrong answer is not catastrophic, but it can quietly cost you tens of thousands of dollars over a career through missed matches, suboptimal tax treatment, or unnecessary fees. The right answer, by contrast, builds a clean contribution waterfall that maximizes every dollar you earn.

This guide walks through the real differences between 401(k)s and IRAs, the 2025 contribution limits, the often-overlooked employer match, and the optimal funding order that most financial planners recommend. We will also cover the situations where the standard advice should be flipped on its head, because rules of thumb only take you so far. By the end, you should be able to look at your own paystub and know exactly where the next dollar goes.

The 401(k): What You Get and What You Give Up

A 401(k) is an employer-sponsored retirement plan, which means your employer chooses the provider, picks the menu of investments, and — in many cases — kicks in matching contributions. You contribute pre-tax dollars from your paycheck, which lowers your current taxable income, and the money grows tax-deferred until you withdraw it in retirement. Roth 401(k) options have become more common too, letting you contribute after-tax dollars in exchange for tax-free growth.

The biggest advantages of a 401(k) are the high contribution limit and the employer match. In 2025, you can stash up to $23,500 in a 401(k), with an additional $7,500 catch-up contribution if you are 50 or older. That is roughly six times the IRA limit. The match — often structured as a 100% match on the first 3% of salary and 50% on the next 2% — is effectively a 50–100% instantaneous return on your money. No other investment product on earth offers that.

The trade-offs are real, though. 401(k) plans often come with high administrative fees, limited investment options, and layers of expense ratios that drag on long-term returns. You also have limited ability to access the money before age 59½ without penalties, though rule 72(t) and certain hardship exceptions exist. Finally, you are locked into whatever provider your employer selected, which means you might be paying 0.85% in fund expenses when an identical index fund at Vanguard costs 0.04%.

The IRA: More Choices, Lower Limits

An Individual Retirement Account (IRA) is something you open on your own, at a brokerage of your choosing — Fidelity, Schwab, Vanguard, or any of several others. You pick every investment from the entire universe of stocks, bonds, ETFs, and mutual funds available on that platform. Fees can be pushed close to zero, and you have granular control over tax-loss harvesting, fractional shares, and rebalancing.

The 2025 IRA contribution limit is $7,000, or $8,000 if you are 50 or older. That is a fraction of the 401(k) limit, which means the IRA is a complement to a workplace plan, not a replacement. IRAs come in two main flavors: traditional (pre-tax contributions, tax-deferred growth) and Roth (after-tax contributions, tax-free growth and withdrawal). Income limits apply to both, with the Roth IRA phaseout for single filers beginning at $150,000 of modified AGI in 2025 and the traditional IRA deduction phaseout for active participants in a workplace plan starting at $79,000.

IRAs generally beat 401(k)s on fees, fund selection, and flexibility. Some IRAs even allow penalty-free early withdrawals for first-home purchases (up to $10,000) and qualified education expenses, which 401(k)s do not. The drawback is the much smaller contribution cap. If you want to save aggressively, the IRA alone cannot keep up — you will need both.

Roth vs Traditional: The Tax Decision Inside Both

Both 401(k)s and IRAs force you to make a tax decision: pay taxes now (Roth) or pay taxes later (traditional). The right answer depends on whether your marginal tax rate today is higher or lower than what you expect in retirement. If you expect to be in a lower bracket later — common for high earners nearing retirement — traditional contributions make sense. If you expect to be in a higher bracket later — common for early-career savers and anyone with a long runway — Roth wins.

There is also a behavioral argument for Roth that gets overlooked. Roth dollars are post-tax, which means every dollar in the account is a dollar you can actually spend in retirement. A traditional $500,000 balance is really a $400,000 balance after federal income tax, but a Roth $500,000 balance is genuinely $500,000. That psychological clarity can sharpen your planning and reduce the temptation to overstate your progress.

The Roth versus traditional decision is rarely about which is "better" in the abstract. It is about which tax treatment best matches your marginal bracket today against your expected bracket in retirement. If you cannot confidently predict the future, tax diversification — splitting contributions across both — is a reasonable hedge.

One important nuance: Roth 401(k)s are not subject to the income limits that constrain Roth IRAs. A high earner who is phased out of a Roth IRA can still use a Roth 401(k) at work, or use the "backdoor Roth" strategy of contributing to a traditional IRA and converting to Roth. Tax law changes periodically, so confirm the current rules before executing any conversion.

2025 Contribution Limits at a Glance

Contribution limits adjust every year or two for inflation, and the 2025 numbers moved noticeably. Knowing the current caps is essential for planning how much to funnel into each account. The numbers below apply to people under 50; if you are 50 or older, add the catch-up contributions noted.

Account Type	2025 Limit (under 50)	Catch-Up (50+)	Total (50+)
401(k), 403(b), 457	$23,500	$7,500	$31,000
IRA (traditional or Roth)	$7,000	$1,000	$8,000
HSA (self-only)	$4,300	$1,000 (55+)	$5,300
HSA (family)	$8,550	$1,000 (55+)	$9,550
SEP IRA / Solo 401(k)	$70,000	$7,500	$77,500

Note the new SECURE 2.0 "super catch-up" rule: starting in 2025, participants aged 60–63 can contribute an enhanced catch-up of $11,250 to a 401(k) instead of the standard $7,500. That is a meaningful boost for late-career savers who got a late start. The IRA catch-up remains a modest $1,000 and is now inflation-indexed under SECURE 2.0, so expect it to creep upward in future years.

The Employer Match: Always Win That First

If your employer offers any kind of 401(k) match, your first retirement dollar should always go toward capturing the full match before considering any other account. The math here is not even close. A typical match might be dollar-for-dollar on the first 3% of your salary — meaning if you earn $75,000 and contribute $2,250, your employer adds another $2,250. That is an instantaneous, guaranteed, risk-free 100% return on your contribution. No stock, bond, or real estate investment can match that.

Failing to capture the full match is, in plain language, leaving free money on the table. According to recurring studies by Financial Engines and Vanguard, roughly one in four 401(k) participants fails to contribute enough to earn the full employer match, leaving an average of $1,336 of free money uncollected each year. Compounded over a 30-year career at 7% real returns, that single mistake can cost you more than $120,000 in retirement.

The mechanics of matches vary by employer, so dig into your plan documents. Some plans use a "safe harbor" formula (100% match on the first 3% of pay, plus 50% on the next 2%). Others use a stretch match (e.g., 50% match on the first 6% of pay). A few employers offer profit-sharing contributions that vest over several years. Know your formula, know your vesting schedule, and contribute at least enough to capture every dollar the company is willing to put in.

The Recommended Funding Order

The standard waterfall recommended by most fee-only financial planners looks like this, and it works for the majority of employees with a 401(k) and IRA eligibility:

1. 401(k) up to the full employer match. This is the highest-return, lowest-risk dollar you will ever invest. Do not skip it.
2. Max out a Roth or traditional IRA. The IRA gives you lower fees, broader investment selection, and flexible withdrawal rules. Fund it after you have captured the match.
3. Return to the 401(k) and contribute up to the annual maximum. Once the IRA is maxed, funnel remaining savings back into the 401(k) until you hit the $23,500 cap.
4. Fund an HSA if you have a high-deductible health plan. HSAs are triple-tax-advantaged (pre-tax contributions, tax-free growth, tax-free withdrawals for qualified medical expenses) and function as a stealth retirement account.
5. Use a taxable brokerage account for any savings beyond the tax-advantaged caps.

For a 30-year-old earning $80,000 with a 100% match up to 5% of salary, this order translates to: contribute $4,000 to the 401(k) to capture the full $4,000 match, then contribute $7,000 to a Roth IRA, then return to the 401(k) to push toward the $23,500 cap if cash flow allows. That single sequence maximizes both the free employer money and the low-fee flexibility of the IRA.

When the Standard Order Should Flip

The waterfall above is a default, not a law. Several situations call for a different sequence. If your 401(k) plan has unusually high fees (some legacy plans charge 1.5%+ in combined administrative and fund expenses) and poor investment options, you may be better off capturing only the match and prioritizing the IRA more aggressively, even if you cannot fully max both. The math gets murky here, so a fee-only planner can run the numbers for your specific plan.

If you are 50 or older and got a late start, the catch-up contributions change the math. The 401(k) catch-up alone is $7,500, which is larger than the entire IRA contribution limit. For late starters, fully funding the 401(k) — including catch-up — often deserves priority over the IRA, simply because the higher ceiling lets you shovel more pre-tax money into the market.

If you expect a major life event in the next few years — buying a first home, returning to school, or starting a business — the IRA's penalty-free early withdrawal provisions for first-home purchases and qualified education expenses can be more valuable than the 401(k)'s larger contribution limit. Finally, if your employer offers a Roth 401(k) option and you are a high earner phased out of a Roth IRA, the Roth 401(k) becomes your primary tool for tax-free growth.

Frequently Asked Questions

Can I contribute to both a 401(k) and an IRA in the same year?

Yes. Participating in a 401(k) at work does not disqualify you from contributing to an IRA. It can, however, affect whether your traditional IRA contribution is tax-deductible. For 2025, the deduction phases out for single filers with modified AGI between $79,000 and $89,000 if they are active participants in a workplace plan. Roth IRA contributions have their own phaseout starting at $150,000 for single filers.

What happens to my 401(k) when I change jobs?

You have four options: leave it with your former employer, roll it into your new employer's 401(k), roll it into an IRA, or cash it out. The first three are usually sensible; the fourth almost always triggers taxes and penalties and is rarely the right move. Rolling into an IRA typically gives you the widest investment selection and the lowest fees.

Is a Roth IRA better than a Roth 401(k)?

Not necessarily — they serve different purposes. A Roth 401(k) has a much higher contribution limit and no income limits, which makes it the only Roth option for high earners. A Roth IRA has lower fees, broader investment options, more flexible early-withdrawal rules, and no required minimum distributions. Many savers benefit from using both.

Should I prioritize the HSA over the IRA?

If you are eligible (you have a high-deductible health plan), the HSA is arguably the best retirement account available because of its triple tax advantage. Many planners now place the HSA immediately after the matched 401(k) and before the IRA in the funding order, especially for healthy savers who can pay current medical expenses out of pocket and let the HSA grow.

Can I contribute to a Roth IRA if my income is too high?

Possibly, through a strategy called the "backdoor Roth." You contribute to a traditional IRA (which has no income limit for contributions, only for deductions) and then convert the balance to a Roth IRA. This works cleanly if you have no other traditional IRA balances; otherwise, the pro-rata rule can complicate the tax treatment. Confirm current rules with a tax professional before executing.

Key Takeaways

• Capture the 401(k) match first. It is the only guaranteed, risk-free 50–100% return available in personal finance.
• Then fund an IRA. Lower fees, broader investment choices, and more flexible withdrawal rules make the IRA the best second dollar.
• Return to the 401(k) up to the maximum. The much higher contribution cap lets serious savers stash $23,500 in 2025.
• Use the HSA as a stealth retirement account if you have a high-deductible health plan, thanks to its triple tax advantage.
• Choose Roth vs traditional based on tax brackets — yours today versus your expected bracket in retirement — and consider tax diversification if the future is unclear.