Roth 401(k) vs Traditional 401(k): Key Differences Explained
A Roth 401(k) and a traditional 401(k) are two types of employer-sponsored retirement savings accounts that differ in how contributions are taxed. For a complete overview of how 401(k) plans work, including contribution limits, vesting, and loans, see the 401(k) Guide for Employees. This page focuses specifically on the tax treatment differences between the Roth and traditional options. Traditional 401(k) contributions are made with pre-tax dollars, reducing current taxable income, and withdrawals in retirement are taxed as ordinary income. Roth 401(k) contributions are made with after-tax dollars, meaning they do not reduce current taxable income, but qualified withdrawals in retirement — including investment earnings — are entirely tax-free.
Both account types share the same annual contribution limit of $24,500 for 2026 ($32,500 for age 50+, $35,750 for age 60–63) and may be offered simultaneously by the same employer plan. An employee may split contributions between a traditional 401(k) and a Roth 401(k), as long as the combined total does not exceed the annual limit.
Source: IRS — Roth Comparison Chart
Side-by-Side Comparison
| Side-by-Side Comparison | ||
|---|---|---|
| Feature | Traditional 401(k) | Roth 401(k) |
| Contributions | Pre-tax (reduces current taxable income) | After-tax (no current tax benefit) |
| Tax on withdrawals | Ordinary income tax on entire withdrawal | Tax-free for qualified distributions |
| 2026 contribution limit | $24,500 (under age 50) | $24,500 (under age 50) |
| Catch-up (age 50+) | $8,000 additional | $8,000 additional |
| Enhanced catch-up (age 60–63) | $11,250 additional | $11,250 additional |
| Employer match | Deposited into traditional (pre-tax) account | Deposited into traditional (pre-tax) account (even if employee chooses Roth) |
| Required Minimum Distributions | Required beginning at age 73 or 75 (depending on birth year) | No longer required during account owner's lifetime (SECURE 2.0, effective 2024) |
| 5-year holding period | Not applicable | Required for tax-free withdrawal of earnings |
| Early withdrawal penalty | 10% penalty + income tax if under 59½ | 10% penalty on earnings + income tax on earnings if under 59½ or 5-year rule not met |
| Best for | Employees who expect to be in a lower tax bracket in retirement | Employees who expect to be in the same or higher tax bracket in retirement |
| Income limits for participation | None | None (unlike Roth IRA, there are no income limits for Roth 401(k) contributions) |
| Source: IRS — 401(k) Limit Increases to $24,500 for 2026 ; IRS — Roth Comparison Chart | ||
How Traditional 401(k) Tax Treatment Works
Contributions to a traditional 401(k) reduce the employee’s taxable income for the year in which the contributions are made. For example, an employee earning $80,000 per year who contributes $10,000 to a traditional 401(k) reports $70,000 in taxable income for federal income tax purposes.
Contributions and investment earnings grow tax-deferred in the account. Income tax is due only when funds are withdrawn, typically in retirement. If the employee is in a lower tax bracket in retirement than during their working years, the tax deferral results in a net tax savings.
Withdrawals from a traditional 401(k) are taxed as ordinary income at the employee’s federal and state income tax rates in the year of distribution. Withdrawals before age 59½ are subject to a 10% early withdrawal penalty unless an exception applies. For a full breakdown of penalty exceptions, see 401(k) Withdrawal Rules.
How Roth 401(k) Tax Treatment Works
Contributions to a Roth 401(k) are made with after-tax dollars. The employee does not receive a tax deduction for the contribution in the year it is made. However, both the contributions and the investment earnings grow tax-free, and qualified distributions are entirely tax-free.
A distribution from a Roth 401(k) is “qualified” — and therefore tax-free — if both of the following conditions are met:
- The distribution occurs after the participant reaches age 59½, becomes disabled, or dies
- The Roth 401(k) account has been open for at least 5 taxable years (the “5-year rule”)
If a distribution does not meet both conditions, the earnings portion may be subject to income tax and the 10% early withdrawal penalty.
No income limits: Unlike a Roth IRA, there are no income limits for contributing to a Roth 401(k). Employees at any income level may make Roth 401(k) contributions if their employer’s plan offers the option. For a detailed comparison of 401(k) and IRA account types, see 401(k) vs IRA: Key Differences.
Employer Match and Roth 401(k)
Employer matching contributions are always deposited on a pre-tax basis, even when the employee’s own contributions are designated as Roth. This means employer match amounts will be held in a separate traditional (pre-tax) account within the plan and will be taxed as ordinary income upon withdrawal.
The SECURE 2.0 Act included a provision allowing employers to offer the option of making matching contributions on a Roth basis. However, adoption of this provision is at the employer’s discretion and is not yet widely implemented.
SECURE 2.0 Changes Affecting Roth 401(k) Accounts
The SECURE 2.0 Act of 2022 introduced several changes that specifically affect Roth 401(k) accounts:
RMDs eliminated for Roth 401(k): Effective for tax years beginning after December 31, 2023, Roth 401(k) accounts are no longer subject to required minimum distributions during the account owner’s lifetime. Previously, Roth 401(k) accounts were subject to RMDs (unlike Roth IRAs), which required participants to either take distributions or roll over to a Roth IRA to avoid RMDs.
Roth catch-up mandate (future): Beginning in tax years after December 31, 2026, employees who earned more than $150,000 in FICA wages in the prior year must make any catch-up contributions on a Roth (after-tax) basis. This provision does not apply for tax year 2026.
Roth employer match option: Employers may now offer employees the option to receive matching contributions on a Roth basis (immediately taxable to the employee). This is a plan-level decision.
Source: IRS — Treasury, IRS Issue Final Regulations on New Roth Catch-Up Rule
Can You Contribute to Both Traditional and Roth 401(k)?
Yes. If the employer’s plan offers both options, an employee may split contributions between a traditional 401(k) and a Roth 401(k) in any proportion. The combined total of traditional and Roth contributions cannot exceed the annual IRS limit of $24,500 for 2026 (plus applicable catch-up amounts).
For example, an employee under age 50 could contribute $15,000 to a traditional 401(k) and $9,500 to a Roth 401(k), totaling $24,500.
Frequently Asked Questions
What is the difference between a Roth 401(k) and a traditional 401(k)?
Traditional 401(k) contributions are made with pre-tax dollars and taxed as ordinary income upon withdrawal. Roth 401(k) contributions are made with after-tax dollars and qualified withdrawals are entirely tax-free. Both types share the same annual contribution limit and may be offered in the same employer plan.
Is a Roth 401(k) better than a traditional 401(k)?
The optimal choice depends on the employee’s current and expected future tax rates. A Roth 401(k) may be more advantageous for employees who expect to be in the same or higher tax bracket in retirement. A traditional 401(k) may be more advantageous for employees who expect to be in a lower tax bracket in retirement, since the tax deduction provides a larger benefit at higher current tax rates.
Are there income limits for a Roth 401(k)?
No. Unlike a Roth IRA, there are no income limits for contributing to a Roth 401(k). Any employee whose employer offers a Roth 401(k) option may contribute regardless of income level.
Do Roth 401(k) accounts have required minimum distributions?
No. Effective for tax years beginning after December 31, 2023, Roth 401(k) accounts are no longer subject to RMDs during the account owner’s lifetime under the SECURE 2.0 Act. This eliminates the previous requirement to take RMDs or roll over to a Roth IRA to avoid them.
Can I contribute to both a Roth 401(k) and a traditional 401(k)?
Yes. If the employer’s plan permits, an employee may split contributions between traditional and Roth 401(k) accounts. The combined total cannot exceed the annual limit of $24,500 for 2026 (plus applicable catch-up contributions).
How is the employer match handled with a Roth 401(k)?
Employer matching contributions are deposited on a pre-tax basis into a traditional (pre-tax) account within the plan, even if the employee’s own contributions are Roth. The match amount will be taxed as ordinary income upon withdrawal. The SECURE 2.0 Act allows employers to optionally offer Roth matching, but this is not yet widely adopted.
Update History
Last Update: March 2026