401k vs Roth IRA vs Brokerage: Where to Put Your Next Dollar

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The 401k vs Roth IRA vs brokerage decision is the most important sequencing question in personal finance — and getting it wrong costs thousands in unnecessary taxes. According to IRS retirement contribution rules for 2025, workers under 50 can contribute up to $23,500 to a 401(k) and $7,000 to an IRA, creating a powerful stack of tax-advantaged space before a brokerage account ever enters the picture.

With interest rates still elevated and tax brackets unchanged under current law, the order in which you deploy each dollar has never mattered more.

How Does Each Account Actually Work?

Each account type operates under a distinct tax structure, and those differences dictate when and why you use each one.

Traditional 401(k)

A traditional 401(k) is funded with pre-tax dollars, reducing your taxable income today. Withdrawals in retirement are taxed as ordinary income. Most employers offer a match — the average 401(k) employer match is roughly 4.7% of salary, which is effectively a guaranteed 100% return on that portion of your contribution.

Roth IRA

A Roth IRA is funded with after-tax dollars. Growth and qualified withdrawals are completely tax-free after age 59½ with a five-year-old account. Income limits apply: for 2025, the phase-out begins at $150,000 for single filers and $236,000 for married filing jointly, per IRS Roth IRA guidance.

Taxable Brokerage Account

A taxable brokerage account has no contribution limits and no withdrawal restrictions. You pay taxes on dividends and realized capital gains annually, but long-term capital gains rates (0%, 15%, or 20%) are typically lower than ordinary income rates. This flexibility makes it essential for goals before age 59½.

What Is the Right Priority Order for 401k vs Roth IRA vs Brokerage?

The optimal order follows a waterfall logic: capture free money first, then shelter growth from taxes, then invest without restriction.

Start by contributing to your 401(k) up to the full employer match. Leaving any match on the table is the single most costly mistake in personal finance. Next, fully fund a Roth IRA if you are eligible — the $7,000 in tax-free compounding space is too valuable to skip. For a deeper comparison of IRA types, see our guide on Roth IRA vs Traditional IRA in 2025.

After the Roth IRA is maxed, return to your 401(k) and contribute up to the $23,500 annual limit. Once all tax-advantaged space is exhausted, direct remaining dollars to a taxable brokerage account. According to Fidelity’s investment priority framework, this sequence maximizes after-tax wealth for the majority of earners.

How Do the Three Accounts Compare Side by Side?

The table below captures the critical mechanical differences that drive the 401k vs Roth IRA vs brokerage decision.

When Does a Taxable Brokerage Account Win?

A taxable brokerage account is the right choice in three specific scenarios — and it is often underrated as a wealth-building tool.

First, if you have already maxed both your 401(k) and Roth IRA, a brokerage is your only remaining investment vehicle. Second, if you need access to funds before age 59½, a brokerage avoids the 10% early withdrawal penalty that applies to retirement accounts. Third, high earners above the Roth IRA income threshold ($165,000 single / $246,000 married in 2025) may use a backdoor Roth IRA conversion strategy, but a brokerage remains the most liquid overflow option.

Choosing the right investments inside a brokerage matters equally. Low-turnover index funds minimize annual taxable distributions. Our comparison of index funds vs ETFs explains why ETFs often generate fewer taxable events than mutual funds in taxable accounts.

How Does Your Tax Bracket Change the Decision?

Your current versus expected future tax rate is the single variable that most shifts the 401k vs Roth IRA vs brokerage calculus.

If you are in the 22% or lower federal bracket today and expect higher taxes in retirement, the Roth IRA wins clearly — you lock in a low tax rate permanently. If you are in the 32% bracket or higher, the pre-tax 401(k) deduction provides more immediate value, and a traditional 401(k) contribution reduces this year’s tax bill dollar-for-dollar within your bracket.

The Tax Foundation’s 2025 bracket data shows the 22% bracket applies to incomes between $47,150 and $100,525 for single filers. Many earners in this range benefit from splitting contributions — some pre-tax 401(k), some Roth — to hedge against future tax rate uncertainty. This strategy is sometimes called tax diversification.

Frequently Asked Questions

Should I max my 401k or Roth IRA first?

Max your 401(k) only up to the employer match first — that match is a guaranteed return. Then fully fund your Roth IRA ($7,000 in 2025) before going back to max the 401(k). This sequence preserves tax-free growth potential while capturing all free employer money.

Can I contribute to a 401k and a Roth IRA in the same year?

Yes. Contributing to a 401(k) and a Roth IRA in the same tax year is both legal and recommended. The accounts have separate IRS limits and do not reduce each other’s contribution capacity.

Is a brokerage account better than a Roth IRA?

No — a Roth IRA is almost always preferable to a taxable brokerage account for retirement savings, because growth and qualified withdrawals are completely tax-free. A brokerage account is the right tool only after tax-advantaged limits are exhausted or when you need pre-retirement access.

What is the 401k vs Roth IRA vs brokerage order for high earners?

High earners above the Roth IRA income limit ($165,000 single in 2025) should max the 401(k) first, then consider a backdoor Roth IRA conversion, then use a taxable brokerage. A mega backdoor Roth — contributing after-tax dollars to a 401(k) and converting them — can add up to $43,500 more in Roth space if the plan allows it.

Does a 401k or brokerage account grow faster?

Both can hold the same investments, so raw growth rates can be identical. The 401(k) wins on an after-tax basis because deferred taxes allow more principal to compound. A brokerage account loses a portion of growth each year to dividend and capital gains taxes.

When should I invest in a brokerage account before maxing retirement accounts?

Consider funding a brokerage account before maxing retirement accounts only if you have a specific financial goal before age 59½ — such as a home purchase, early retirement, or a planned career break. Otherwise, always exhaust tax-advantaged space first.