Traditional IRA vs Roth IRA: Which Should You Roll Your 401k Into in 2026?
This is the biggest decision in any rollover. Pay taxes now (Roth) or defer them until retirement (Traditional)? The right answer depends on your income, your age, and what you believe tax rates will do. Here's how to think through it.
The Core Difference in Plain English
| Feature | Traditional IRA | Roth IRA |
|---|---|---|
| Rollover taxable now? | No — tax-free | Yes — taxable event |
| Growth taxed? | Tax-deferred | Tax-free forever |
| Withdrawals in retirement | Taxed as ordinary income | 100% tax-free |
| Required Minimum Distributions | Yes, starting at age 73 | No RMDs ever |
| Income limits (for rollover) | None | None (conversions only) |
| Best for | Higher earners today, lower in retirement | Lower earners today, higher in retirement |
The Roth Conversion Tax Bill — What It Actually Costs
When you roll a pre-tax 401k into a Roth IRA, every dollar you convert is added to your taxable income that year. For a $100,000 balance, that's $100,000 of new income. Depending on your bracket and filing status, you could owe $22,000–$37,000+ in federal taxes that year. State taxes may apply too.
This is why many financial planners recommend partial conversions — converting just enough each year to stay within a lower tax bracket, rather than converting everything at once and jumping into a higher one. Our rollover calculator can help you model this.
When the Traditional IRA Wins
A 401k-to-Traditional IRA rollover is tax-free. You preserve the full balance, it continues to grow tax-deferred, and you only pay taxes when you withdraw in retirement. The Traditional IRA wins when:
You're in a high tax bracket today
If you're earning well in your 40s or 50s, deferring taxes until retirement (when your income will likely be lower) usually saves money.
You don't have cash to pay the conversion tax bill
The tax on a Roth conversion ideally comes from outside money. If you'd have to liquidate part of the IRA to cover the tax, you're losing the compounding benefit.
You're close to retirement
Fewer years of tax-free growth means the Roth's advantage shrinks. The break-even period for a Roth conversion is usually 7–10+ years.
When the Roth IRA Wins
The Roth's power is tax-free growth for decades plus zero RMDs. It wins when:
You're early in your career with 20+ years to retirement
Decades of tax-free compounding can more than offset the upfront tax hit. $50,000 growing tax-free at 7% for 30 years = ~$380,000 with zero tax on withdrawal.
You're in a low tax bracket right now (below 22%)
If you're between jobs or had a low-income year, this is an ideal window to convert — you'll pay taxes at a low rate and the conversion is relatively cheap.
You want to leave a tax-free inheritance
Inherited Roth IRAs pass to beneficiaries tax-free. For estate planning, the Roth is significantly more valuable than a Traditional IRA.
You want to avoid Required Minimum Distributions
Roth IRAs have no RMDs. If you don't need the money at 73, it keeps growing tax-free indefinitely. Traditional IRAs force you to withdraw — and pay taxes — whether you need to or not.
The "Which Bracket" Framework
The question comes down to: what tax rate will you pay on a dollar of retirement income vs. what rate would you pay converting it now?
| Your situation today | Expected retirement income | Likely best choice |
|---|---|---|
| Low income, early career (10–12% bracket) | Higher (Social Security + pension) | Roth conversion now |
| Mid-career, peak earnings (22–24%) | Similar or lower | Traditional or partial Roth |
| High earner (32%+ bracket) | Significantly lower | Traditional IRA |
| Transitional year (left job, income gap) | Higher | Roth conversion (opportunistic) |
Frequently Asked Questions
Is rolling a 401k to a Roth IRA taxable?
Yes. When you roll a pre-tax 401k into a Roth IRA, the converted amount is added to your taxable income for that year. You pay income taxes now but qualified withdrawals in retirement are completely tax-free. Read our full tax guide →
Can I roll a 401k directly into a Roth IRA?
Yes. This is called a direct Roth conversion rollover. The funds go from your 401k custodian straight into a Roth IRA. You'll owe income tax on the pre-tax amount, reported via Form 1099-R with distribution code "G" (direct rollover) or as a conversion. No early withdrawal penalty applies.
Are there income limits on rolling a 401k to a Roth IRA?
No. Income limits only apply to annual Roth IRA contributions (in 2026: $161,000 single / $240,000 married). Rollover conversions from 401k to Roth IRA are available at any income level — this is the well-known "backdoor Roth" pathway for high earners.
Can I convert only part of my 401k to a Roth?
Yes. You can roll part of your 401k to a Traditional IRA (tax-free) and convert a portion to a Roth IRA in the same year. This lets you control how much taxable income you recognize and is often the smartest approach for larger balances.
Still deciding Traditional vs Roth?
The free checklist includes a step specifically on this decision — and what questions to bring to a CPA before converting.
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