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

This is framed as an either/or choice and it almost never is. For most people the answer is "both, in a specific order", and the order is more valuable than the choice.

Limits change every year with inflation. Everything below is a framework; check the current figures on the IRS website before you act, because contribution caps and income phase-outs are revised annually.

The funding order

Work down this list. Stop when you run out of money.

1. 401(k) up to the full employer match

Non-negotiable, and not close. A typical match is 50% of your contributions up to 6% of salary, which means every dollar you put in up to that point instantly becomes $1.50. That is a 50% guaranteed return, available nowhere else in investing, and it beats every other option on this list regardless of your tax situation.

Common match structures:

Check the vesting schedule. Some employers vest the match over three to six years, so leaving early forfeits part of it. If you expect to change jobs within two years, a match with a three-year cliff may be worth less than it appears — but it is still usually worth taking.

2. HSA, if you have a qualifying high-deductible health plan

The most tax-advantaged account that exists. Contributions are pre-tax (or tax-deductible), growth is tax-free, and withdrawals for qualified medical expenses are tax-free. Three separate advantages on the same dollar. No other account does this.

Additional features that make it unusually powerful:

• No required minimum distributions
• Unused balances roll over forever — it is not use-it-or-lose-it
• After age 65, non-medical withdrawals are taxed as ordinary income, exactly like a traditional IRA

The strategy most people miss: pay medical expenses out of pocket, keep receipts, and let the HSA invest and compound. You can reimburse yourself years later. This turns the HSA into an effectively tax-free retirement account.

3. Roth IRA, up to the annual limit

Now the real decision. See the next section for whether Roth or traditional is right for you.

An IRA gives you something a 401(k) usually cannot: control over what you invest in and what you pay for it. Workplace plans typically offer ten to thirty funds, sometimes including options with expense ratios above 0.70%, and often carry administrative fees. An IRA at a low-cost broker gives you the entire market at 0.03%.

The fee difference is not trivial. On $200,000 over twenty-five years, 0.70% versus 0.05% is roughly $60,000.

4. Back to the 401(k), up to the maximum

Once the IRA is full, return to the workplace plan even if its fund choices are mediocre. The tax shelter and the payroll automation outweigh an expense ratio that is 0.40% too high.

If your plan offers a brokerage window — a self-directed option inside the 401(k) — check whether it gives access to lower-cost funds. Sometimes it does, sometimes it adds fees.

5. Taxable brokerage

No limits, no restrictions, no tax shelter. Capital gains and qualified dividends are taxed at preferential rates, and ETFs are more tax-efficient than mutual funds here — see index fund vs ETF vs mutual fund for why.

If you reach this step you are saving aggressively, and at that point the conversation shifts to what to invest in beyond retirement accounts.

Roth or traditional: the actual decision

Everything else on this list is mechanical. This is the one judgement call.

The comparison is simple in principle: traditional gives you a tax break now and taxes the withdrawal; Roth taxes you now and makes the withdrawal tax-free.

Which wins depends on one number — your marginal tax rate today versus your expected marginal rate in retirement.

Why young and lower-income means Roth

Three reasons, and the second is the one people miss:

1. You are likely at your lifetime tax low. Rates rise with income. Paying 12% now to avoid 24% later is a good trade; the reverse is not.
2. Roth contributions grow tax-free for forty years. The growth is the majority of the eventual balance. Taxing the seed corn but not the harvest is the right structure for a long horizon.
3. Roth IRAs let you withdraw contributions, not gains, at any time, tax- and penalty-free. That is a genuine emergency backstop. Not a reason to use it — but it exists, and traditional accounts have no equivalent.

The bracket-filling strategy

High earners often assume Roth is off the table. It usually is not — the better answer is both. Contribute traditionally until you reach the top of your current bracket, then switch to Roth for the remainder. This fills the low brackets with tax-free growth and takes deductions in the high ones.

Doing this inside a 401(k) requires your plan to offer a Roth option, which most now do. Some plans allow the election to be changed each pay period; others only annually.

Contribution limits and phase-outs

These adjust annually for inflation. Check the IRS site for the current year's figures. What to know structurally:

• 401(k) limits are much higher than IRA limits — roughly four to five times
• Catch-up contributions are available from age 50 in both, with higher limits
• Roth IRA eligibility phases out at higher incomes. Above the phase-out range you cannot contribute directly at all
• Traditional IRA deductibility phases out if you or your spouse have a workplace plan and your income exceeds a threshold — you can still contribute, it just is not deductible, which removes most of the point
• The Saver's Credit gives a non-refundable credit for contributions at lower incomes. It is real money and almost nobody claims it. Check whether your income qualifies when you file.

What to invest in inside each account

Once the order is decided, the fund choice is easy.

One refinement worth knowing: asset location. If you hold bonds, put them in the tax-sheltered accounts where the interest is not taxed annually, and keep equities in the taxable account where gains get preferential rates. This is a genuine optimisation and it costs nothing to implement.

Common mistakes

• Not taking the match. The most expensive error available, and the most common. If your plan auto-enrols you at 3% and the match goes to 6%, you are leaving half of free money on the table every single pay period.
• Contributing to a Roth IRA and leaving it in cash. The settlement fund is not an investment. You must place a trade.
• Choosing funds by past performance. Rankings are not predictive. Expense ratios are.
• Ignoring plan fees. Read the 409(a)(5) fee disclosure your plan is required to send you annually. If your plan's cheapest option is 0.75%, that is worth raising with HR — plans change providers when enough participants complain.
• Stopping at the match because "the market is high." Time in the market beats timing it, and nobody has reliably predicted a top. Automation removes the question.
• Cashing out a 401(k) when changing jobs. Taxes plus a 10% early withdrawal penalty, and you permanently lose decades of compounding. Roll it into an IRA or your new employer's plan. It takes one form.

The summary

1. 401(k) to the full match — always, whatever your tax bracket
2. HSA if you qualify — the best account in the tax code
3. Roth IRA to the limit if you are early-career or in a lower bracket
4. Traditional IRA or back to the 401(k) if you are in a high bracket
5. Max the 401(k)
6. Taxable brokerage

If you can only do step one, do step one. An employee contributing just enough to capture a full match, over thirty years, will typically end up with more than a non-matched employee who contributes twice as much. That is how large the match advantage is.

Reviewed for accuracy against our editorial guidelines. Figures quoted are illustrative and reflect publicly available rates at the time of the last update; always confirm current terms with the provider.