Both accounts offer tax-advantaged growth for retirement savings, but they differ in contribution limits, investment options, and — most importantly for many people — whether an employer is putting in free money. The order you fund them in can meaningfully change your long-term outcome.

The Core Difference

A 401(k) is an employer-sponsored account, available only through your workplace, with investment options limited to whatever the plan offers. An IRA (Individual Retirement Account) is opened independently through a brokerage, with far more control over what you invest in.

Both come in traditional (pre-tax contributions, taxed on withdrawal) and Roth (after-tax contributions, tax-free withdrawal) versions.

Why Employer Match Changes Everything

If your employer offers a 401(k) match — commonly matching 50-100% of your contributions up to a certain percentage of your salary — that match is an immediate, guaranteed return that no other investment can match. Leaving it unclaimed is effectively declining part of your compensation.

This is why the common recommendation is: contribute enough to your 401(k) to get the full employer match first, before directing money anywhere else.

After the Match: Why an IRA Often Comes Next

Once you’ve captured the full match, an IRA frequently makes sense as the next stop, for a simple reason: investment options. A 401(k) plan is limited to whatever funds the plan administrator selected — often a handful of target-date or index funds, sometimes with above-average fees. An IRA opened through a major brokerage gives you access to a much wider range of low-cost funds and individual investments.

Contribution Limits Matter Too

401(k)s allow substantially higher annual contribution limits than IRAs. For someone trying to save aggressively, maxing out an IRA is often achievable well before maxing out a 401(k) — which is part of why a common order looks like: 401(k) match → IRA → back to 401(k) for additional contributions.

(Exact dollar limits change periodically and should be checked for the current year, since they’re adjusted for inflation.)

Roth vs. Traditional Applies to Both

Both the 401(k) and IRA come in Roth and traditional versions, and that choice is a separate decision from which account type to prioritize — it depends mainly on whether you expect to be in a higher or lower tax bracket in retirement than you are now.

A Simple Priority Order

  1. Contribute enough to your 401(k) to get the full employer match
  2. Max out an IRA (Roth or traditional, depending on your tax situation)
  3. Return to the 401(k) and contribute further, up to the annual limit, if you’re able to save more

Bottom Line

The employer match is the single most important factor — it’s not really a “401(k) vs. IRA” decision so much as “capture the free money first, then decide based on investment flexibility.” From there, an IRA’s broader fund selection often makes it the more efficient next stop before maxing out the 401(k) further.