401(k) Roth: Complete Guide to Roth 401(k) Contributions

A 401 k roth combines features of traditional 401(k) plans with Roth IRA tax treatment. When you contribute to a Roth 401(k), you pay income tax on that money in the current year.

Not every employer offers a Roth 401(k) option. You'll need to check with your plan administrator to see if your workplace retirement plan includes this choice.

Here's a side-by-side comparison:

• Traditional 401(k): Pre-tax contributions, taxable withdrawals, immediate tax deduction
• Roth 401(k): After-tax contributions, tax-free withdrawals, no current-year deduction
• Tax benefit timing: Traditional = now, Roth = later
• Required minimum distributions: Both require RMDs starting at age 73 in 2026

Employer matching contributions always go into a traditional 401(k) account, even when you're making Roth contributions. You cannot receive employer matches in Roth format.

You can split your contributions between traditional and Roth 401(k) options however you prefer, as long as your combined total doesn't exceed these limits. The flexibility to divide contributions gives you tax diversification—having both pre-tax and after-tax retirement savings.

Total contribution limits including employer matches reach $70,000 for workers under 50 (or $77,500 with catch-up contributions). Remember that employer contributions don't count against your personal contribution limit.

Choosing between 401 k roth and traditional options depends largely on your current tax bracket versus your expected retirement tax bracket. If you anticipate being in a higher tax bracket during retirement, Roth contributions make mathematical sense.

Consider Roth 401(k) contributions if:

• You're early in your career with lower current income
• You expect significant income growth over time
• You want tax-free income in retirement for planning flexibility
• You've maxed out Roth IRA contributions and want additional Roth savings
• You expect tax rates to increase in the future

• You're in a high tax bracket now and expect a lower bracket in retirement
• You need the immediate tax deduction to reduce current-year taxes
• You're closer to retirement with peak earning years
• You have significant deductions already and want to preserve them

Let's examine the long-term difference between Roth 401(k) and traditional 401(k) with concrete numbers. Assume you're 30 years old, earn $80,000 annually, and want to contribute $10,000 to your 401(k) in 2026.

Traditional 401(k) scenario:

• Contribution: $10,000 (pre-tax)
• Current-year tax savings: $2,200
• Take-home pay reduction: $7,800
• After 30 years at 7% average annual growth: $76,123
• Tax owed at withdrawal (assuming 22% bracket): $16,747

• Contribution: $10,000 (after-tax)
• Current-year tax savings: $0
• Take-home pay reduction: $10,000
• After 30 years at 7% average annual growth: $76,123
• Tax owed at withdrawal: $0

The Roth option produces $16,747 more in after-tax retirement wealth, assuming your tax rate stays the same. If your retirement tax rate is lower than 22%, the traditional option closes the gap.

Qualified distributions from a Roth 401(k) are completely tax-free and penalty-free when you meet two conditions: you're at least age 59½ and the account has been open for at least five years. The five-year clock starts on January 1 of the year you make your first Roth 401(k) contribution.

Here's the withdrawal sequence:

1. 1First, your contributions come out (tax-free, penalty-free)
2. 2Then, any conversion amounts (tax-free, but may have penalties)
3. 3Finally, earnings (taxed and penalized if withdrawn early)

Required minimum distributions (RMDs) apply to Roth 401(k) accounts starting at age 73 in 2026, unlike Roth IRAs which have no lifetime RMDs. However, you can roll your Roth 401(k) into a Roth IRA to avoid RMDs if you want maximum flexibility.

Roth 401(k) to Roth IRA rollovers are straightforward:

1. 1Open a Roth IRA at a brokerage or bank if you don't already have one
2. 2Request a direct rollover from your 401(k) plan administrator
3. 3Ensure the funds transfer directly between institutions (trustee-to-trustee)
4. 4Keep your rollover paperwork for tax records

The five-year clock for your Roth IRA starts separately from your Roth 401(k) clock. If you've had a Roth IRA open for five years, you immediately satisfy the five-year rule.

You can contribute to both a 401 k roth and a Roth IRA in the same year, though income limits apply to Roth IRA contributions. For 2026, Roth IRA contributions phase out for single filers earning between $150,000 and $165,000, and for married couples filing jointly earning between $236,000 and $246,000.

Roth 401(k) plans have no income restrictions. High earners locked out of Roth IRA contributions can still access Roth tax treatment through their workplace retirement plan.

• Roth 401(k): $23,500 (under 50) or $31,000 (50+)
• Roth IRA: $7,000 (under 50) or $8,000 (50+)
• Combined maximum Roth contributions: $30,500 (under 50) or $39,000 (50+)

This strategy maximizes your tax-free retirement savings potential while maintaining flexibility. Some workers fund their Roth 401(k) up to the employer match level, then prioritize Roth IRA contributions for better investment options, then return to max out the Roth 401(k) if funds allow.

Can I convert my traditional 401(k) to a Roth 401(k)?

Some employers allow in-plan Roth conversions where you convert existing traditional 401(k) balances to Roth 401(k) within the same plan. You'll owe income tax on the converted amount in the year of conversion, but future growth and withdrawals become tax-free.

What happens to my Roth 401(k) if I die?

Does employer matching count toward my Roth 401(k) contribution limit?

Employer matching contributions don't count against your personal $23,500 contribution limit. However, employer matches always go into a traditional (pre-tax) 401(k) account, even when your employee contributions go into the Roth 401(k).

Should I do Roth 401(k) if I'm close to retirement?

Workers approaching retirement can still benefit from Roth 401(k) contributions, especially if they expect a long retirement or want to leave tax-free assets to heirs. The five-year rule requires planning—contributions made at age 60 won't be fully qualified until age 65.