Roth IRA vs. 401(k): Which Should You Prioritize First?

If you have access to both a workplace 401(k) and an individual Roth IRA, you do not have to pick one forever — but you do have to pick an order, because most people cannot max out both at once. Roth IRA vs. 401(k) is really two smaller questions: which account is taxed when, and which one is free money.

Roth IRA vs. 401(k): the core difference

A traditional 401(k) takes contributions out of your paycheck before tax. Your taxable income drops today, the money grows untaxed, and you pay ordinary income tax when you withdraw it in retirement.

A Roth IRA works in reverse. You contribute money that has already been taxed, it grows untaxed, and withdrawals in retirement — including all the growth — are tax-free.

Neither is objectively better. A traditional 401(k) wins if you expect to be in a lower tax bracket in retirement than you are now. A Roth IRA wins if you expect to be in the same or a higher bracket later — which is common early in a career, when your income (and tax rate) has nowhere to go but up.

Why the employer match changes everything

If your employer matches 401(k) contributions — a common structure is 50% or 100% of what you contribute, up to some percentage of salary — that match is an immediate, guaranteed return no investment can compete with. Turning down a full match to fund a Roth IRA first means leaving free money on the table before you have earned a single dollar of investment return.

This is the one rule that overrides everything else in this article: contribute enough to your 401(k) to get the full match, no matter which account you prefer.

Contribution limits and who can use each

The Roth IRA's income limit is the detail people miss: above a certain income, you cannot contribute directly at all. High earners typically use a "backdoor" conversion instead (see below).

When a Roth IRA wins

Beyond the full employer match, a Roth IRA is usually the better next dollar if:

• You are early in your career and expect your income — and tax bracket — to rise.
• Your 401(k) plan has poor fund choices or high fees (some employer plans charge 0.5%–1% or more; see why fees matter this much).
• You want flexibility: Roth IRA contributions (not earnings) can be withdrawn any time without penalty, which is not true of a 401(k).

When maxing your 401(k) wins

After the full match, going back to your 401(k) makes sense if:

• You are in a high tax bracket now and expect a lower one in retirement.
• You have already maxed your Roth IRA's annual contribution limit and still have money to invest.
• Your plan has genuinely low-cost index funds, closing the fee gap with an IRA.

The backdoor Roth, briefly

If your income is above the Roth IRA limit, a common workaround is contributing to a traditional IRA (no income limit on contributions) and immediately converting it to a Roth. This is legal and widely used, but it has tax wrinkles if you hold other traditional IRA money — it is worth reading the specific rules or speaking to a tax professional before doing it, not something to copy from a blog post without checking your own situation.

A sensible funding order

This is a default, not a rule — someone with high-interest debt should generally clear that first, and someone with no cash buffer should build one before locking money into a retirement account they cannot easily reach.

What this article does not tell you

This is education, not personalized advice — see our disclaimer. Contribution limits change most years, employer match formulas vary enormously, and the traditional-vs-Roth tax comparison depends on assumptions about your future income and future tax law that nobody can know for certain.

What does not depend on any of that: an unclaimed employer match is money you have already earned and are choosing not to collect. Whatever else you decide, do not leave that on the table.