Should I Transfer My 401(k) To a Roth IRA?

When you leave a job, taking your 401(k) with you is almost always the right call. Cashing it out is rarely a good idea because early withdrawals can trigger income taxes plus a 10% federal penalty. The better move is rolling those funds into a new retirement account, either the 401(k) plan at your next employer or an IRA you open on your own.

Leaving money stranded in an old 401(k) also carries real risk. You may lose track of it over time, and you cannot control any plan changes your former employer makes. Keeping that money in an account you actively monitor puts you in a better position.

In this Reddit post, an employee heading back to school for an extended period faces a specific challenge: no new employer means no new 401(k) to roll into. So they are weighing whether to open an IRA, specifically a Roth IRA. There are solid reasons to consider it, but the process requires some care.

The upside of a Roth IRA

The core advantage of a Roth IRA over a traditional IRA comes down to when you pay taxes. With a traditional IRA, contributions go in pre-tax and investments grow on a tax-deferred basis. You pay the bill when you take withdrawals in retirement. With a Roth IRA, you contribute after-tax dollars, so qualified withdrawals in retirement are completely tax-free. If you contribute $100,000 over time and your balance grows to $1.1 million, you keep all $1 million in gains without owing the IRS a penny.

Roth IRAs also carry no required minimum distributions during your lifetime. Traditional IRAs and 401(k)s force you to begin taking withdrawals once you reach age 73, which triggers ordinary income taxes on those distributions and eliminates the benefit of further tax-free compounding. A Roth account lets your money keep growing on its own schedule. For someone stepping away from the workforce to go back to school, that long-horizon flexibility is particularly valuable.

One more practical point: for 2025, the annual contribution limit for a Roth IRA is $7,000, or $8,000 if you are 50 or older. Direct contributions are subject to income limits: the phase-out begins at $150,000 in modified adjusted gross income for single filers and at $236,000 for married couples filing jointly. Above $165,000 (single) or $246,000 (married filing jointly), direct contributions are not permitted. Importantly, Roth conversions from a 401(k) or traditional IRA carry no income ceiling. Anyone can convert, regardless of earnings.

Watch out for the tax bill on a Roth conversion

Rolling a traditional 401(k) directly into a Roth IRA is a taxable event. Because traditional 401(k) contributions are made with pre-tax dollars, the entire converted amount is treated as ordinary income in the year you complete the rollover. A large conversion can push you into a higher tax bracket for that year, so the size and timing of the conversion both matter.

One practical approach is to first roll your 401(k) into a traditional IRA, then convert the traditional IRA to a Roth IRA in stages. That two-step approach lets you decide how much to convert each year and spread the tax hit across multiple tax years, keeping you in a lower bracket each time. The conversion deadline is December 31 of the tax year in which you want the conversion to count, so there is some room to plan within a given calendar year.

There is also a lesser-known wrinkle worth flagging. Under the Roth IRA 5-year rule, the IRS requires a waiting period of five years before you can withdraw earnings from converted funds penalty-free, unless you are age 59 and a half or older. The five-year clock begins on January 1 of the tax year in which the conversion is made. For a student heading back to school who might need to access funds in the near term, triggering that clock is something to think through carefully before converting.

Finally, a larger conversion increases your modified adjusted gross income in the year it is completed. For anyone already enrolled in Medicare, a sizable conversion can trigger higher Income Related Monthly Adjustment Amount (IRMAA) surcharges on Part B and Part D premiums, using a two-year income lookback. A conversion that seems manageable today could raise your healthcare premiums two years down the road.

Get professional guidance before you convert

Given these moving parts, consulting a tax professional or financial advisor before pulling the trigger is worthwhile. A good advisor can model the tax impact of converting in stages versus all at once, weigh your expected future income and bracket against today’s rates, and flag any Medicare or other benefit implications.

One more helpful backdrop: the One Big Beautiful Bill Act, signed into law on July 4, 2025, made the individual income tax brackets originally established by the 2017 Tax Cuts and Jobs Act permanent. That removes one major reason to rush a conversion purely to lock in current rates before they rose. The current brackets are now the long-term baseline, which gives savers more flexibility to pace conversions strategically rather than feeling pressured by a looming tax-law cliff.

All things considered, rolling an old 401(k) into a Roth IRA is a move that can pay off significantly over a long retirement horizon. Going in with a clear plan for the tax consequences is what turns a good idea into a smart execution.

Editor’s note: This update added the Roth IRA 5-year rule for conversions, the 2025 income phase-out thresholds for direct Roth IRA contributions ($150,000 to $165,000 for single filers, $236,000 to $246,000 for married filing jointly), the 2025 annual contribution limit of $7,000 ($8,000 for savers 50 and older), a note on Medicare IRMAA surcharges triggered by large conversions, and the context that the One Big Beautiful Bill Act (signed July 4, 2025) made current tax brackets permanent.