Overview
Choosing between a traditional 401(k) and a Roth 401(k) comes down to when you prefer to pay taxes. A traditional account uses pre-tax dollars and defers tax until withdrawal, while a Roth-style account uses after-tax dollars so qualified withdrawals can be tax-free.
For a broader look at retirement savings options that complement employer plans, see Roth IRA and Retirement Savings Overview.
Key takeaways
- Traditional accounts lower taxable income now; withdrawals are taxed later.
- Roth-style accounts require paying tax up front but can offer tax-free growth.
- Your current and expected future tax brackets are the main factors to weigh.
- Employer matches can affect the overall tax picture and should be evaluated.
How it works
Contributions to traditional 401(k)s are typically deducted before income tax, reducing taxable income in the contribution year. Taxes are paid on withdrawals during retirement at your ordinary income rate.
Roth 401(k) contributions are made with after-tax dollars. Qualified distributions are generally tax-free, including earnings, if rules for age and holding period are met.
If you want details on pre-tax retirement accounts and how they compare, review Tax-Deductible Retirement Plans for more background information.
What it may cover (and what it may not)
A Roth 401(k) covers employee contributions and the growth on those contributions under the Roth rules that apply to employer plans. It does not change how employer matching contributions are treated for tax purposes.
Employer matches are usually made on a pre-tax basis. Those matched dollars and their earnings are generally taxable when withdrawn, even if your personal contributions were to a Roth-style option.
Common mistakes to avoid
- Choosing a Roth 401(k) without estimating your future tax bracket and retirement income needs.
- Assuming employer matches follow the same tax treatment as your Roth contributions.
- Converting large pre-tax balances to Roth without a plan to cover the tax bill in the conversion year.
- Neglecting to check plan rules, contribution limits, and withdrawal restrictions before switching.
Questions to ask an agent
- How will switching affect my take-home pay and long-term taxes?
- What are the plan rules for Roth contributions, rollovers, and required minimum distributions?
- How are employer matching contributions handled under the plan?
- Can I afford the tax cost of a conversion from pre-tax to after-tax accounts this year?
Next steps
Start by checking your current tax bracket and projecting your likely bracket in retirement. Compare that projection against the immediate tax cost of Roth contributions or conversions.
Speak with your company's human resources or plan administrator to confirm whether a Roth option is available and to learn the plan-specific rules for rollovers and matches.
If you prefer personalized help to review options and run tax scenarios, talk to an agent.
Frequently Asked Questions
Will my employer match change if I switch to a Roth 401(k)?
Employer matches typically remain the same, but matches are usually contributed on a pre-tax basis and taxed on withdrawal.
Can I convert an existing traditional 401(k) balance to a Roth 401(k)?
Many plans allow in-plan conversions or rollovers to a Roth account, but conversions trigger income tax on the converted amount.
Are Roth 401(k) withdrawals always tax-free?
Qualified Roth withdrawals are generally tax-free if you meet the plan’s age and holding-period requirements; nonqualified distributions may be taxable.
How do required minimum distributions (RMDs) affect Roth accounts?
Roth 401(k) accounts are subject to RMD rules while you hold the plan, though rolling to a Roth IRA can eliminate RMDs for the owner.