Updated 2026-03-30
Roth 401(k) Conversion Guide
Convert Traditional 401(k) to Roth and pay taxes now for tax-free growth
A Roth conversion lets you move pre-tax retirement funds into a Roth account, paying taxes now in exchange for tax-free withdrawals in retirement. This can be a powerful strategy if you expect to be in a higher tax bracket later.
What Is a Roth Conversion?
A Roth conversion involves transferring money from a Traditional 401(k) or IRA to a Roth account. You pay income taxes on the converted amount in the year of conversion, but all future growth and qualified withdrawals are tax-free.
Types of Roth Conversions
| Conversion Type | From | To | Key Consideration |
|---|---|---|---|
| In-Plan Conversion | Traditional 401(k) | Roth 401(k) | Same employer plan, requires plan support |
| Rollover Conversion | Traditional 401(k) | Roth IRA | After leaving employer or in-service distribution |
| IRA Conversion | Traditional IRA | Roth IRA | No income limits, pro-rata rule applies |
| Backdoor Roth | After-tax IRA | Roth IRA | For high earners above Roth IRA income limits |
The 5-Year Rule
Converted funds must remain in the Roth account for at least 5 years before the earnings can be withdrawn tax-free. Each conversion has its own 5-year clock. However, if you are over 59 1/2, you can withdraw the converted principal immediately without penalty.
When a Roth Conversion Makes Sense
- Low-income year: Sabbatical, job change, or early retirement when your tax bracket is temporarily low
- Market downturn: Convert when balances are down to pay less tax on the same number of shares
- Before RMDs start: Reduce future Required Minimum Distributions by converting in your 60s
- Estate planning: Roth accounts pass tax-free to heirs (still subject to 10-year distribution rule)
Frequently Asked Questions
The converted amount is added to your ordinary income for the year. For example, converting $50,000 while earning $80,000 puts your total income at $130,000. Use our Roth conversion calculator to estimate your tax impact based on your specific situation and filing status.
No. Since the Tax Cuts and Jobs Act of 2017, Roth conversions cannot be reversed (recharacterized). This makes it important to plan carefully and consider converting smaller amounts over multiple years to avoid jumping tax brackets.
No. Unlike Roth IRA contributions, there is no income limit for Roth conversions. High earners who cannot contribute directly to a Roth IRA can use conversions (including the backdoor Roth strategy) to get money into Roth accounts.
Pavlo Pyskunov
Managing Director & Investment Fund Director
Pavlo Pyskunov analyzes employer-sponsored retirement plans using IRS publications and DOL Form 5500 filings, helping workers maximize their 401(k) savings through data-driven guidance.
Last updated: 2026-03-30