IRA vs 401(k)

The first difference is where the account comes from. A 401(k) is sponsored by your employer. You can only have one if your company offers it, you enroll through your workplace, and contributions usually come straight out of your paycheck before you ever see the money. The plan is run by an administrator the employer chooses, which is why the available investments and fees are out of your hands.

An IRA, short for individual retirement account, is the opposite: you open it yourself, directly at a broker, with no employer involved. Anyone with earned income can open one, whether or not they have a job with a retirement plan. Because you control the account, you choose the broker, the investments, and you fund it on your own schedule rather than through payroll. This independence is the IRA's main advantage and the source of most of the other differences below.

The single biggest reason to use a 401(k) is the employer match. Many companies add money to your account based on what you contribute, for example matching 50% or 100% of your contributions up to a percentage of your salary. That match is effectively free money and an immediate return on what you put in, which no IRA can offer.

An IRA has no match because there is no employer in the picture; every dollar comes from you. This is why a widely used framework is to contribute at least enough to the 401(k) to capture the full match before funding anything else. Leaving match money on the table is one of the more common and costly retirement-saving misses. Walnut is not a financial advisor, so treat this as a common pattern, not a personal recommendation.

The two accounts have very different ceilings, and they are separate, so contributing to one does not reduce how much you can put in the other. For 2026 the IRS set the 401(k) employee contribution limit at $24,500, with an additional $8,000 catch-up for those age 50 and older, and a higher $11,250 catch-up for ages 60 to 63. Counting employer contributions, the combined 2026 cap is $72,000.

The IRA limit is much lower: $7,500 for 2026, with an extra $1,100 catch-up at age 50 and up for a total of $8,600. So if you want to save more than about $7,500 a year in a single tax-advantaged account, the 401(k) is the one with room. These figures are the 2026 numbers and change most years; confirm the current limits at irs.gov before you act.

This is where the IRA wins decisively. Because you open it at a broker of your choice, you can hold almost anything the broker offers: individual stocks, hundreds of low-cost ETFs, mutual funds, and more. If you want a specific stock or a particular index fund, you can usually buy it.

A 401(k) limits you to the menu the plan administrator selects, often a few dozen mutual funds and a handful of target-date options. Some menus are excellent and low cost; others are narrow and expensive, and you cannot add a fund that is not on the list. This narrower choice, and the fees that sometimes come with it, is a major reason people roll an old 401(k) into an IRA once they no longer work there.

Fees differ because of who controls the account. At major brokers, IRAs commonly have no account fee, and you can choose investments with very low expense ratios. A 401(k)'s costs depend entirely on the plan: some large employers negotiate very low fees, while smaller plans can carry administrative charges and pricier funds layered on top of the fund expense ratios. You cannot shop around inside a 401(k) the way you can with an IRA.

Loans are one feature the 401(k) has and the IRA does not. If your plan permits it, you can borrow against your 401(k) balance and repay yourself, typically with interest. An IRA does not allow loans at all; taking money out early is a withdrawal, not a loan, and can trigger taxes and penalties. The rules and trade-offs around 401(k) loans, including what happens to an outstanding loan if you leave the job, are involved, so check your plan documents and a tax professional. Walnut is not a tax advisor and this is not tax advice.

IRA versus 401(k) is a separate question from traditional versus Roth, and both accounts come in both flavors. A traditional version generally gives you a tax break now: contributions may be pre-tax or deductible, the money grows tax-deferred, and you pay ordinary income tax on withdrawals in retirement. A Roth version flips that: you contribute after-tax dollars now, and qualified withdrawals in retirement are tax-free.

So you can have a traditional 401(k) or a Roth 401(k) (if your plan offers the Roth option), and a traditional IRA or a Roth IRA. Roth IRAs have income limits on who can contribute directly, and starting in 2026 certain higher earners must make their 401(k) catch-up contributions on a Roth basis. The traditional-versus-Roth choice comes down largely to whether you expect to be in a higher or lower tax bracket later, which is a personal tax question; confirm details with a tax professional. Our Roth IRA vs 401(k) guide compares those two side by side.

The two accounts connect when you change jobs. When you leave an employer, your 401(k) does not have to stay put. You can roll the balance into an IRA, a move called a rollover. A direct rollover sends the money straight from the old plan to the IRA, which preserves its tax status and avoids withholding; done correctly it is not a taxable event.

People roll over for the reasons this guide has covered: an IRA usually offers far wider investment choice, often lower fees, and the convenience of consolidating several old workplace accounts in one place you control. Rolling a traditional 401(k) into a traditional IRA keeps the same tax treatment; converting to a Roth IRA is a taxable event in the year you do it. Because the tax handling matters, confirm the steps with your plan administrator and a tax professional before moving anything.

The pattern most people land on follows from the table: capture the employer match in the 401(k) first, since that is free money no IRA can match, then use an IRA for its wider and often cheaper investment choices. The contribution limits shown are the 2026 IRS figures and change most years; verify the current numbers at irs.gov before you act. For more on each account on its own, see our what is an IRA and what is a 401(k) guides.

Whichever account you use, the harder question is what you actually own inside it and how those holdings are doing. A 401(k) menu and a self-directed IRA can both drift into too much overlap or too much concentration in a few names, and most account dashboards will not flag that for you. The useful questions are specific: how concentrated am I, where do my funds overlap, and how is each position doing against the broad market.

That is where Walnut fits, especially for a rollover IRA at a broker it can connect to. Walnut links your existing brokerage through SnapTrade and lets you ask, in plain language through Claude, ChatGPT, or a built-in assistant, how your holdings are allocated and how each is performing against the S&P 500. It is read-only until you choose to trade, and you approve every order. Walnut is informational and is not a financial or tax advisor; it helps you see your own account, not pick your accounts or investments for you.

A 401(k) comes from your employer, may include a match, and lets you contribute the most ($24,500 in 2026), but confines you to a plan-chosen menu. An IRA you open yourself, with no match and a lower limit ($7,500 in 2026), but with a far wider, often cheaper set of investments. Both come in traditional and Roth flavors, both grow with a tax advantage, and the two have separate contribution limits, so many people use both.

The framework most savers follow is straightforward: contribute to the 401(k) at least up to the full employer match, then fund an IRA for the wider choices, and roll old 401(k) balances into an IRA when you change jobs. The specifics, contribution limits, income thresholds, and the tax treatment of rollovers depend on your situation and change over time, so verify the current rules at irs.gov and with a qualified tax professional before deciding.