Is a 401(k) rollover taxable?

A direct rollover from a traditional 401(k) to a traditional IRA is completely tax-free under IRC § 402(c). The transaction is excluded from gross income and does not appear on your federal or state tax return as income. A Roth conversion is different — converting pre-tax 401(k) money to a Roth IRA is intentionally taxable at ordinary income rates.

How do I roll my 401(k) to an IRA without paying taxes?

Request a direct rollover — your plan sends the funds directly to the receiving IRA custodian, with no check made payable to you. A direct rollover to a traditional IRA is tax-free under IRC § 402(c). If you receive a check instead (an indirect rollover), the plan withholds 20% for taxes and you have only 60 days to redeposit the full amount including the withheld portion. Failing to do so creates a taxable distribution plus a potential 10% early withdrawal penalty.

Can I roll my 401(k) to a Roth IRA without paying taxes?

No — converting pre-tax 401(k) money to a Roth IRA is always a taxable event. The converted amount is ordinary income in the year of conversion under IRC § 408A(d)(3). However, you can minimize the tax cost by timing conversions in low-income years, filling lower tax brackets first, and avoiding IRMAA cliffs. Rolling to a traditional IRA first and then converting in stages over multiple years typically results in much lower total taxes than converting all at once.

What is the 20% withholding trap and how do I avoid it?

If you take an indirect rollover — where the plan issues a check payable to you — federal law requires your plan to withhold 20% of the distribution for income taxes (IRC § 3405(c)). Even if you redeposit the full amount within 60 days, you still owe tax on the 20% withheld until you file your return and get the refund. If you can't come up with the 20% out-of-pocket to make the IRA whole, that shortfall becomes a taxable distribution. Avoid this entirely by always requesting a direct rollover to the new custodian.

How do I avoid the IRMAA cliff on a large 401(k) Roth conversion?

IRMAA (Income-Related Monthly Adjustment Amount) is a Medicare premium surcharge that kicks in at $109,000 MAGI for single filers and $218,000 for married filing jointly in 2026. Crossing that threshold by even one dollar costs roughly $974 per person per year in extra Part B premiums, plus Part D surcharges. To avoid the cliff: calculate your MAGI before initiating a Roth conversion, stay just under the threshold (or plan to go well above it if the conversion math still works), and consider spreading large conversions over multiple years before Medicare enrollment.

How to Avoid Taxes on a 401(k) Rollover: 7 Strategies (2026)

The short answer: a direct rollover from a traditional 401(k) to a traditional IRA is completely tax-free — $0 in federal taxes, $0 in state taxes. The strategies in this guide are about doing the rollover correctly, timing any Roth conversion for minimum cost, and preserving tax-advantaged options that a mistimed rollover can permanently close off.

Bottom line up front: If you are rolling a traditional 401(k) directly to a traditional IRA, you will owe no federal or state income tax on the transfer regardless of the dollar amount. Read on only if you are also considering a Roth conversion, have employer stock with large appreciation, or are within two years of Medicare enrollment.

Strategy 1: Always use a direct rollover (not a check)

Under IRC § 402(c), a direct rollover — where your plan sends funds directly to the receiving IRA custodian, never passing through your hands — is completely excluded from gross income. No federal tax. No state tax. No withholding. The rollover amount does not appear on Line 5b of your Form 1040.

An indirect rollover is different. If your plan cuts a check payable to you, federal law requires 20% mandatory withholding under IRC § 3405(c). You get a check for 80% of your balance. To make the IRA whole, you must redeposit 100% of the pre-withholding amount within 60 days — which means you need to come up with the withheld 20% from somewhere else. If you don't, the IRS treats that 20% as a taxable distribution, and if you're under 59½, you also owe a 10% early withdrawal penalty.

Fix: When you call your plan administrator, say explicitly: "I want a direct rollover to [custodian name] IRA, sent via wire transfer or check made payable to [custodian] FBO [your name]." Never let them cut a check payable to you unless you understand what you're agreeing to.

Strategy 2: Convert to Roth in your income-gap years

If a Roth conversion is right for you, timing is everything. The best windows are years when your income is temporarily low:

Job change or layoff year — a layoff year may be your lowest-income year in decades. Converting $50,000–$100,000 in a year when you're otherwise in the 12% bracket costs far less than the same conversion in a 24% or 32% year.
Early retirement gap — the years after your last paycheck but before Social Security and RMDs begin. If you retire at 60 and defer Social Security to 70, you may have 7–10 years of low-income years ideal for converting pre-tax money at 12–22%.
Pre-RMD window — converting large pre-tax balances before RMDs start at age 73 (or 75 for those born in 1960 or later) reduces the future mandatory distribution base and the tax rate you'll pay on it.

See the rollover-at-retirement guide and Roth conversion ladder for detailed year-by-year conversion math.

Strategy 3: Fill tax brackets — don't convert everything at once

A $500,000 lump-sum Roth conversion hits the 37% bracket. The same $500,000 spread over 5 years at $100,000/year likely stays in the 22–24% range if your other income allows it. Bracket-filling — converting only up to the top of a bracket without crossing into the next — consistently produces lower lifetime tax costs than a single large conversion.

The threshold to remember for 2026:

Top of bracket	Single filer	Married filing jointly
12% bracket	$50,400 taxable income	$100,800 taxable income
22% bracket	$105,700 taxable income	$211,400 taxable income
24% bracket	$201,775 taxable income	$403,550 taxable income

Source: IRS Rev. Proc. 2025-32. Taxable income = gross income minus standard deduction ($16,100 single / $32,200 MFJ) and other deductions. A Roth conversion adds to your taxable income dollar-for-dollar.

For example: a married couple with $60,000 in Social Security and pension income has roughly $27,800 in taxable income after the standard deduction ($60,000 − $32,200). They could convert up to $73,000 more before hitting the top of the 12% bracket ($100,800 total). Converting $73,000 at 12% costs about $8,760 in federal income tax — versus $23,360 if done in a 32% year.

Strategy 4: Stay below the IRMAA cliff (if on Medicare)

For anyone enrolled in Medicare, MAGI above $109,000 (single) or $218,000 (MFJ) triggers an IRMAA surcharge — an extra Medicare premium the IRS bills retroactively based on your income two years earlier. In 2026, crossing the first tier costs roughly $974 per person per year in additional Part B premiums, plus Part D surcharges.²

That means a $1 Roth conversion that pushes MAGI from $108,999 to $109,001 costs $974 in Medicare premiums for 2028 — completely avoidable with planning. If you're within two years of 65 (or currently enrolled), calculate your MAGI carefully before initiating any Roth conversion and stay either comfortably under the threshold or far enough over that the IRMAA penalty doesn't materially change the conversion math.

See the IRMAA-aware conversion planning section in the state tax guide and the rollover-at-retirement guide for multi-year sequencing strategies.

Strategy 5: Use NUA for appreciated employer stock instead of rolling

If your 401(k) holds highly appreciated employer stock, a complete rollover to an IRA converts all future gains to ordinary income. The Net Unrealized Appreciation (NUA) strategy under IRC § 402(e)(4) lets you take the employer stock as a lump-sum distribution, pay ordinary income tax only on your cost basis (typically much lower than the current value), and pay long-term capital gains rates — currently 0%, 15%, or 20% — on all appreciation.

Example: You hold $400,000 of your employer's stock in your 401(k), with a cost basis of $80,000. If you roll it all to an IRA, every dollar you eventually withdraw is ordinary income (up to 37%). Under NUA, you pay ordinary income tax on the $80,000 basis, then 15% (or 20% for high earners) on the $320,000 of appreciation — a potentially significant difference. Use the NUA calculator to model your specific numbers.

Strategy 6: Relocate before converting to eliminate state income tax

Nine states have no state income tax at all — Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. Illinois and Pennsylvania exempt most retirement income from state tax. Converting a $500,000 IRA in California adds 9.3%–13.3% state tax on top of federal rates. The same conversion in Texas costs zero in state tax.

If you're planning a large Roth conversion and also considering a state change, the sequencing matters: establish domicile in the lower-tax state first, then convert. A married couple converting $400,000 in a California 12.3% year versus a Texas $0 year saves $49,200 in state income tax on that one conversion. See the state income tax guide for a full 50-state breakdown.

Strategy 7: Spread a large rollover over multiple years

If you have a large 401(k) balance (over $500,000) and want to convert to Roth, you don't have to move everything in one tax year. Partial rollovers from a 401(k) to an IRA are allowed — and once money is in the IRA, you can convert it to Roth IRA in stages over as many years as it takes to fill lower brackets.

The mechanics: initiate a direct rollover of the portion you want to convert in year one, move it to a traditional IRA, then convert to Roth that same year. Repeat annually. You stay in control of the tax cost each year based on your actual income. See the partial rollover guide and Roth conversion ladder for execution details.

Roth conversion tax cost calculator (2026)

Enter your estimated income excluding the conversion, your filing status, and the conversion amount. The calculator shows your marginal rate on the conversion and the federal tax cost.

Filing status

Other income (before conversion)

Amount to convert ($)

When you should pay the taxes (and why Roth conversions are not always bad)

These strategies are about minimizing unnecessary tax costs. But Roth conversions are not inherently bad — in many situations, paying tax now at 22% is far better than paying it later at 32% or higher. The right answer depends on:

Your expected tax rate in retirement versus today (if future rates are higher, convert now)
Whether you have RMDs coming that will force taxable income at an unfavorable rate
Whether you want to leave tax-free assets to heirs (a Roth IRA has no lifetime RMDs and passes tax-free)
Your Medicare enrollment status (IRMAA implications)

The worst strategy is converting large amounts impulsively without modeling the bracket impact. The best is to work through the math year by year with someone who specializes in rollover and distribution planning.

Three real scenarios

Scenario 1: Job change at 41, $280,000 balance — zero taxes owed

Maria changes jobs and has $280,000 in her old 401(k). She calls the plan administrator, requests a direct rollover to a Fidelity traditional IRA, and provides the FBO account information. The check arrives at Fidelity payable to "Fidelity FBO Maria [lastname]" in 10 days. Federal tax owed: $0. State tax owed: $0. Maria is now at Fidelity with access to FZROX and the full fund universe. She has 20+ years before RMDs.

Scenario 2: Retiring at 62, $1.4M balance — bracket-filling over 8 years

David retires at 62 with $1.4M in a traditional 401(k) and defers Social Security to 70. He converts $70,000/year to Roth IRA for 8 years (ages 62–69), staying in the 22% bracket ($100,800 − $32,200 standard deduction = $68,600 taxable income headroom, roughly). Each year's conversion costs about $15,400 in federal tax at 22%. After 8 years, he has converted $560,000 to Roth at an average ~22% rate. When Social Security kicks in at 70 and RMDs begin at 75, the remaining pre-tax balance is much smaller, keeping him in a lower bracket indefinitely.

Scenario 3: Employer stock, $340,000 cost basis $60,000 — NUA saves $48,000

Patricia retires at 60 with $340,000 of company stock in her 401(k), with a cost basis of $60,000. If she rolls the stock to an IRA, every future withdrawal is ordinary income. Using NUA, she pays ordinary income tax (say 24%) on $60,000 = $14,400, and long-term capital gains tax (15%) on $280,000 appreciation = $42,000. Total tax on the distribution: $56,400. Had she rolled to IRA and then withdrawn the full $340,000 at a 32% rate, she'd have owed $108,800 — a difference of $52,400. The NUA calculator shows her break-even against the IRA rollover in net present value terms.

Sources

IRS Rev. Proc. 2025-32 — 2026 tax brackets, standard deductions, contribution limits
CMS: 2026 Medicare Parts B & D Premiums and IRMAA
IRS Pub. 575 — Pension and Annuity Income (direct rollover exclusion under IRC § 402(c))
IRS: IRC § 402(e)(4) — NUA rules for employer securities

Tax values verified July 2026 against IRS and CMS sources. Bracket thresholds from IRS Rev. Proc. 2025-32; IRMAA thresholds from CMS 2026 premium announcement.

Getting the rollover right matters. A direct rollover is straightforward — but the Roth conversion decision, NUA analysis, and multi-year sequencing require modeling your specific income, tax rate, and Medicare situation. An error here is hard to undo. See below to connect with a fee-only advisor who specializes in this planning.