Converting your 401(k) to a Roth IRA after residency or fellowship

First, quick translation: rollover vs. conversion (because words matter)

What a rollover is

A rollover is moving money from one retirement account to another. If you move pre-tax money from a traditional 401(k) to a traditional IRA,
that’s generally a non-taxable rollover. Same tax “bucket,” just a different container.

What a Roth conversion is

A Roth conversion happens when pre-tax retirement money moves into a Roth account (like a Roth IRA).
Pre-tax dollars become after-tax dollars, so the converted amount is generally added to your taxable income for that year.
In other words: the IRS doesn’t hate you, it just wants its cut now instead of later.

So what does “convert your 401(k) to a Roth IRA” mean?

It usually means one of these:

• Traditional (pre-tax) 401(k) → Roth IRA = taxable Roth conversion.
• Roth 401(k) → Roth IRA = typically non-taxable rollover (if done correctly).
• After-tax (non-Roth) 401(k) money → Roth IRA = can be very tax-efficient if handled carefully.

Why this question shows up right after training

The “resident/fellow to attending” transition creates a weird tax situation that doesn’t happen many times in life:
your income can jump dramatically, but the timing of that jump can leave you with a partial-year of higher earningsor sometimes even a
lower-income gap (relocation, boards, credentialing delays, fellowship-to-attending lag, etc.).

Common reasons new attendings consider a Roth conversion

• Potentially lower tax rate now than later (especially if you expect decades of higher income).
• Long runway for tax-free growth (you’re early in your career; time is your best employee).
• Tax diversification: having both pre-tax and Roth money gives you flexibility in retirement.
• Roth IRA perks: no required minimum distributions (RMDs) for the original owner, and generally more withdrawal flexibility than a 401(k).
• Planning around future “high-income problems” (like wanting to do backdoor Roth IRA contributions).

The key word is potentially. If you convert at the wrong time (say, in your first full year at a high attending salary),
you could pay a premium tax rate for the privilege of feeling productive.

Before you do anything: answer these 6 questions

1) Is your old account pre-tax, Roth, or a mix?

Many workplace plans hold multiple “sources” of money:
pre-tax employee deferrals, employer match (usually pre-tax), Roth deferrals, and sometimes after-tax (non-Roth) contributions.
You need to know what you’re working with because each piece rolls/converts differently.

2) What tax year are you converting in?

Tax planning is calendar-year planning. The year you graduate, the year you start, and the year you become a “full-year attending”
can all look very different on your tax return.

3) Do you have cash to pay the tax bill without raiding the account?

Paying conversion taxes from cash savings (not from the converted funds) usually preserves more money inside the Roth,
where growth can be tax-free long term. Using withholding from the converted amount can reduce what gets invested and may create complications,
especially if you’re under age 59½.

4) Are you planning to use the backdoor Roth IRA strategy?

If you plan to do backdoor Roth IRA contributions later, rolling pre-tax 401(k) money into a traditional IRA can create a “pro-rata rule” headache.
(Translation: part of future conversions may become taxable in a way you didn’t intend.)

5) Is your new employer’s plan good enough to accept a rollover?

Sometimes the simplest move is: old 401(k) → new 401(k), keeping money pre-tax and keeping your IRA balances clean for backdoor Roth contributions.
This depends on whether your new plan accepts rollovers and what investment options/fees it offers.

6) Are there state taxes, credits, or loan programs that care about your income?

Roth conversions increase taxable income. That can ripple into things like state income taxes and certain income-based programs.
If you’re on an income-driven student loan plan or receiving any income-based benefit, a conversion might have side effects.

Your main options for an old 401(k) after residency/fellowship

Option A: Leave it where it is

This can be fine if the plan is low-cost, well-diversified, and has good creditor protections.
The downside: limited investment choices and the “I forgot that account existed” phenomenon.

Option B: Roll it into your new employer’s plan (traditional → traditional)

This is often a strong move if your new plan is solid. It keeps the money pre-tax, avoids triggering taxes today,
and can help you keep your traditional IRA balance at $0useful if you plan backdoor Roth IRA contributions.

Option C: Roll it into a traditional IRA (traditional → traditional)

This is usually non-taxable and can unlock a wider investment menu. The catch: pre-tax IRA balances can complicate backdoor Roth strategy
because of the pro-rata rule.

Option D: Convert it to a Roth IRA (traditional → Roth)

This is the taxable conversion route. You pay ordinary income tax on the converted amount now.
In exchange, future qualified Roth IRA withdrawals can be tax-free, and Roth IRAs generally avoid RMDs for the original owner.

How the taxes really work (with a simple example)

When you convert pre-tax money to a Roth IRA, the converted amount is generally treated as ordinary income for that year.
It stacks on top of your other income, which means converting “just a little” might be taxed at a lower marginal rate,
while converting “a lot” could push you into higher brackets.

Example: Dr. Rivera’s transition year conversion

Dr. Rivera finishes fellowship in June and starts an attending job in October. That year, total taxable wages are lower than a full-year attending salary.
Dr. Rivera has an old pre-tax 401(k) worth $40,000.

• If Dr. Rivera converts $10,000, it adds $10,000 to taxable income.
• If Dr. Rivera converts $40,000, it adds $40,000 and could push part of that conversion into a higher tax bracket.

Same account, same year, different outcomesbecause the conversion amount changes your tax rate on the margin.
This is why many people do partial conversions over several years instead of one giant YOLO conversion.

Step-by-step: how to convert your 401(k) to a Roth IRA the clean way

Step 1: Confirm what money types you have

Call the plan administrator or check the statement for “sources,” such as:
pre-tax employee deferrals, employer match, Roth deferrals, and after-tax contributions.

Step 2: Open the right receiving account(s)

Depending on your situation, you may open:

• A Roth IRA (for Roth rollovers and/or conversions)
• A traditional IRA (if you’re rolling pre-tax money first, or separating sources)

Step 3: Choose the pathway that matches your goal

• Pathway 1: Direct traditional 401(k) → Roth IRA
  Simple and direct. Also taxable for the amount converted.
• Pathway 2: Traditional 401(k) → Traditional IRA, then Traditional IRA → Roth IRA
  Often used when the 401(k) won’t roll directly to Roth IRA or when you’re splitting sources.
  Still taxable when you do the conversion step.
• Pathway 3: Separate after-tax vs pre-tax sources
  If you have after-tax (non-Roth) contributions, you may be able to roll:
  pre-tax to a traditional IRA and after-tax to a Roth IRA to reduce taxable income from the move.
  This is powerfulbut you must execute it carefully.
• Pathway 4: Keep pre-tax money in a new employer plan, convert only what makes sense
  Especially useful if you want to keep IRAs empty for backdoor Roth contributions while still converting strategically.

Step 4: Use a direct rollover whenever possible

A direct rollover means the check is made payable to the receiving custodian (often “FBO: Your Name”).
This helps avoid mandatory withholding and removes the stress of the 60-day rollover deadline.

Step 5: Decide on tax withholding (usually: don’t withhold from the rollover)

Many people choose to pay the tax bill from cash savings rather than withholding from the conversion.
Why? Withholding shrinks the amount that lands in the Roth IRA, and if you’re under 59½,
withheld amounts can sometimes be treated like an early distribution.

Step 6: Invest the money once it arrives

A rollover is not an investment strategy. Once funds hit the Roth IRA, choose a portfolio that matches your timeline and risk tolerance.
Many physicians default to diversified, low-cost index funds or a simple three-fund portfolio.

Step 7: Document the tax paperwork

Expect forms such as:

• Form 1099-R (shows the distribution from the 401(k))
• Form 5498 (shows the IRA receiving rollover/contribution information)
• Form 8606 (often used to report Roth conversions and track after-tax basis in IRAs)

Keep these with your tax records. Future You will thank Present Youprobably quietly, because Future You is tired.

The pro-rata rule: the “surprise tax” that gets doctors every year

If you’ll be doing backdoor Roth IRA contributions (common for high-income attendings),
beware: having pre-tax money in any traditional/SEP/SIMPLE IRA at year-end can cause part of your conversion to be taxable under the pro-rata rule.

That’s why some new attendings avoid rolling old pre-tax 401(k) money into a traditional IRA.
Instead, they either leave it in a 401(k) (old or new employer plan), or they convert intentionally with eyes wide open.

Bottom line: if backdoor Roth is in your future, plan your rollover/conversion sequence carefully.
This is one of those areas where a fee-only CPA or financial planner can earn their keep in about 30 minutes.

Roth “five-year rules” you should know (because Roth has… feelings)

Roth accounts have timing rules that can affect when withdrawals are tax- and penalty-free.
Two big concepts show up often:

• Roth IRA earnings rule: earnings are typically tax-free only after the Roth IRA has met a five-year aging requirement
  and you meet a qualifying condition (like being 59½+).
• Roth conversion five-year rule: each conversion can have its own five-year clock affecting penalty treatment
  for early withdrawals of converted amounts.

If you’re converting right after training, you’re probably not planning to touch that money soonbut it’s still important to understand,
especially if you’re considering early retirement, a career pivot, or a “sabbatical” that suspiciously resembles quitting medicine.

When converting after training is usually smart (and when it’s usually not)

Often smart

• You have a low-income year (or relatively lower tax bracket) during the transition.
• You expect to be in a higher bracket later (common for physicians).
• You have cash to pay taxes and want tax-free growth for decades.
• You want Roth assets for retirement tax flexibility.

Often not smart

• You’re already in a high bracket (first full year attending) and would pay steep taxes on the conversion.
• You don’t have cash for taxes and would need to withhold from the conversion.
• You’re trying to keep income low for a specific reason (loan repayment calculations, certain credits, etc.).
• You haven’t checked the pro-rata implications and plan to do backdoor Roth IRA later.

Common pitfalls (a.k.a. ways to donate extra money to the IRS)

• Doing an indirect rollover and missing the 60-day deadline.
• Forgetting mandatory withholding rules that can apply when a distribution is paid to you instead of directly rolled over.
• Converting too much in one year and pushing yourself into higher brackets unnecessarily.
• Creating a big pre-tax IRA right before you want to do backdoor Roth IRA contributions (hello, pro-rata rule).
• Ignoring after-tax contribution details and accidentally making part of an after-tax rollover taxable.
• Not investing the rollover (yes, cash is technically an “asset class,” but it’s a sad one for long-term retirement).

FAQ

Can I convert my 401(k) to a Roth IRA while I’m still employed?

Sometimes. Some plans allow “in-plan Roth rollovers” (converting within the plan) or in-service rollovers,
but many do not. If your plan allows it, it can still be taxablejust executed inside the plan.

Does rolling over to a Roth IRA count as a Roth IRA contribution limit?

No. Rollovers and conversions are not the same as annual Roth IRA contributions.

Can I undo a Roth conversion if I regret it?

Generally, Roth conversion “recharacterizations” were eliminated years ago. Plan carefully before converting.

What about my Roth 401(k) money?

Roth 401(k) dollars can usually roll into a Roth IRA without additional taxes, as long as the rollover is done properly.
This can also simplify your retirement accounts and potentially avoid certain plan-specific rules down the road.

Conclusion: a practical decision framework

Converting an old 401(k) to a Roth IRA after residency or fellowship can be a powerful wealth-building moveif it’s done in the right year,
in the right amount, and without stepping on tax landmines like the pro-rata rule or sloppy rollover mechanics.

A simple way to decide:

1. Identify what money types you have (pre-tax, Roth, after-tax).
2. Estimate your current-year tax bracket (transition year vs full-year attending).
3. Decide whether you need “clean IRAs” for backdoor Roth IRA.
4. Convert only the amount that makes sense (often partial conversions).
5. Use direct rollovers, keep paperwork, and invest promptly.

If you’re unsure, consider paying a tax professional for a one-time planning session.
It’s cheaper than accidentally paying the IRS extra because you were busy learning your new hospital badge swipe system.

Disclaimer: This article is for educational purposes and is not tax, legal, or financial advice.

Real-world experiences after training (what people wish they’d known)

Let’s talk about the part nobody puts in the onboarding packet: the emotional roller coaster of doing a Roth conversion right after training.
Not the dramatic kind of roller coastermore like the “Why am I getting so many emails from my retirement plan administrator?” kind.
Below are common experiences physicians share (and the lessons hiding inside them).

1) “I thought it was one click. It was… not one click.”

Many new attendings assume converting an old 401(k) to a Roth IRA is like transferring money between checking accounts. In reality,
you’ll often juggle forms, identity verification, medallion signature guarantees (occasionally), and the mysterious waiting period where your money is “in transit.”
The best coping strategy people report: start the process when life is calmso, basically, never. But seriously: start early, expect friction, and keep a checklist.

2) “The taxes didn’t hurt until April.”

A conversion can feel painless in the moment, especially if you don’t withhold taxes from the rollover (which many prefer).
Then tax season shows up like an uninvited consult: “Hey, remember that conversion? Let’s discuss.”
The lesson: physicians who felt best about their conversions tended to set aside cash for taxes immediately, or increased estimated payments,
rather than hoping their W-2 withholding would magically cover it.

3) “I converted too much because I finally had momentum.”

There’s a psychological trap in early attending life: you finally have money and agency, so every good financial idea feels like it should be done at maximum volume.
Some people convert a large balance in a single year and later realize they pushed themselves into a higher bracket than necessary.
The folks who seemed happiest long-term usually described a “fill the bracket” approachconverting a measured amount each year,
especially in years where their taxable income was temporarily lower.

4) “Backdoor Roth was my goal… and I accidentally made it messy.”

This one is common: a physician rolls an old 401(k) into a traditional IRA for simplicity, then later learns that having pre-tax IRA dollars
can complicate backdoor Roth IRA contributions due to the pro-rata rule. The resulting feeling is a blend of confusion and betrayal,
even though the IRS never promised to be emotionally supportive.
The takeaway: if backdoor Roth is in your future, it’s worth planning the sequencesometimes keeping pre-tax money in a 401(k) (old or new) is cleaner.

5) “It was worth it… because it gave me options.”

When people are glad they converted, the reason is rarely “because Roth is always better.”
It’s more often: “I wanted tax diversification,” “I expect higher taxes later,” or “I like having a bucket of tax-free money.”
In other words, the win is flexibility.

6) “I learned that personal finance is mostly personal psychology.”

Some physicians love the certainty of paying taxes now and moving on. Others prefer keeping deductions today because it feels more tangible.
Neither is automatically right or wrong. The best experience reports usually came from people who made a plan that matched their reality:
their expected income trajectory, their family situation, their student loan strategy, their tolerance for complexity, and their ability to save outside retirement accounts.

If you’re in this transition right now, here’s a surprisingly effective move: write down why you’re converting (or not converting) in one paragraph.
If your reason is “Because someone on the internet yelled about Roth,” you might want to slow down.
If your reason is “This is a lower-income year, I can pay the taxes from cash, and I want long-term tax-free growth,” you’re thinking like a pro.