Should High Earners Do a Roth Conversion? (w/Examples) + FAQs

This article reflects federal rules and California state rules as of June 2026 and covers tax years 2025 and 2026. Tax law changes — confirm current figures before you file. This is educational information, not personal tax advice; for your own numbers, work with a licensed CPA or tax attorney.

Quick Answer

Yes — many high earners should do a Roth conversion, but only in the right year and in the right amount. For tax year 2026, there is no income limit on conversions. The smart move is to convert just enough to “fill” a tax bracket without triggering higher Medicare premiums (IRMAA) or the 3.8% investment surtax.

A Roth conversion means you move money from a pre-tax account, like a traditional IRA or 401(k), into a Roth account. You pay income tax on the converted amount now, and in exchange the money grows tax-free and comes out tax-free later. For a high earner, the danger is that converting in a peak-income year stacks the conversion on top of your salary and gets taxed at 32%, 35%, or even 37%, while also raising your Medicare costs two years down the road.

The timing is what separates a smart conversion from an expensive mistake. The lower seven federal tax brackets — 10%, 12%, 22%, 24%, 32%, 35%, and 37% — were made permanent by the One Big Beautiful Bill Act (OBBBA) signed in 2025, so the old fear of rates snapping higher in 2026 is gone. But your own rate can still spike in any year you retire, sell a business, or take a large bonus, and that is exactly when a conversion can backfire.

Here is what you will learn in this guide:

💰 How to convert at a 24% rate today instead of a 37% rate later, with the exact math.
🩺 How conversions raise your Medicare IRMAA surcharges two years later, and how to dodge the cliffs.
🚪 How the backdoor and mega backdoor Roth let high earners get money into Roth even when direct contributions are blocked.
⚠️ The pro-rata rule trap that can turn a “tax-free” backdoor into a surprise tax bill.
📋 A step-by-step plan, the forms to file, and the deadlines you cannot miss.

What a Roth Conversion Actually Is

A Roth conversion is a taxable event you choose on purpose. You take money sitting in a pre-tax account — a traditional IRA, a SEP-IRA, a SIMPLE IRA, or a 401(k) — and move it into a Roth IRA or Roth 401(k). The amount you convert is added to your taxable income for that year, just like a paycheck.

You do this because of one core idea: pay tax at a known low rate now to avoid an unknown, possibly higher rate later. Once money is in a Roth, it grows tax-free, qualified withdrawals are tax-free, and a Roth IRA has no required minimum distributions during your lifetime. That last point matters a lot for high earners, because pre-tax accounts force you to pull money out starting at age 73, whether you need it or not.

There is no income limit and no dollar limit on a conversion. This is the key difference from a Roth contribution. For tax year 2026, you cannot contribute directly to a Roth IRA if your modified adjusted gross income (MAGI) is $153,000 or more (single) or $242,000 or more (married filing jointly), per Vanguard’s 2026 limits. But you can convert any amount, at any income. That open door is what makes the strategy work for high earners.

The cost of getting it wrong is real. If you convert $200,000 in a year your salary already fills the 32% bracket, you hand the IRS roughly $64,000 in federal tax plus state tax, when waiting one year to a low-income window might have taxed the same dollars at 24% or less. The fix is to treat the conversion as a yearly dial you turn carefully, not a lever you yank once.

Why High Earners Get Special Treatment

High earners face a unique trap: they often have the largest pre-tax balances and the least room to convert cheaply. Decades of maxing out 401(k)s build seven-figure traditional accounts. Those accounts feel like savings, but they are really an IOU to the IRS that grows every year.

The problem shows up at age 73, when required minimum distributions (RMDs) begin. A $2 million traditional IRA can force out more than $75,000 in its first RMD year, stacked on top of Social Security, pensions, and investment income. For a high earner, that forced income can push them into the 32% or 35% bracket and the top IRMAA tier, with no way to turn it off.

Converting earlier shrinks that future RMD. Every dollar you move to Roth in your 50s and 60s is a dollar that never becomes a forced, fully taxed withdrawal at 73. As the Liberty Group notes, even high earners can convert pre-tax assets, and the planning value is highest for those with large balances and a low-income gap year ahead.

Which Situation Applies to You?

The right answer depends entirely on your stage of life and income. Find yourself below, then read the matching example later in this guide.

You are a working high earner in your peak salary years (32%+ bracket). Direct conversions are usually a bad idea now — your marginal rate is too high. Focus instead on the backdoor and mega backdoor Roth to get new money into Roth tax-efficiently.
You are a pre-retiree (late 50s to mid-60s) with a large pre-tax balance. This is the sweet spot. Plan a multi-year conversion campaign in the gap between leaving work and starting Social Security and RMDs.
You just retired or had a low-income “gap year.” Your income may have dropped into the 12%, 22%, or 24% bracket. This is the single best year to convert aggressively — but watch the IRMAA cliffs.
You are already on Medicare (65+). Conversions still help reduce future RMDs, but every dollar now affects your Medicare premium two years later. Convert in measured amounts.
You own a business with a down year or a sale ahead. A low-profit year or a year with large suspended losses can create a rare low-rate conversion window. Coordinate with your CPA before year-end.

The 2026 Brackets That Drive the Decision

A conversion’s wisdom is decided by the gap between your tax rate today and your expected rate later. So you have to know the brackets. For tax year 2026, the married-filing-jointly brackets from Fidelity are: 10% up to $24,800, 12% to $100,800, 22% to $211,100, 24% to $403,550, 32% to $512,450, 35% to $768,700, and 37% above that.

The standard deduction for 2026 is $15,750 for single filers and $31,500 for married filing jointly, per Empower’s bracket summary. This deduction is the first chunk of income you can convert at a 0% rate if you have little other income.

The big strategic point is the wide 24% bracket. For a married couple in 2026, the 24% rate runs all the way up to $403,550 of taxable income. That means a couple in a low-income year can often convert well into six figures and still stay at 24% or below — a rate that looks cheap next to a future 35% or 37% RMD. OBBBA made these brackets permanent, so there is no artificial 2026 deadline forcing your hand; you can spread conversions over many years.

The IRMAA Trap Every High Earner Must Map

Here is the cost most people miss. IRMAA — the Income-Related Monthly Adjustment Amount — is a Medicare surcharge added to your Part B and Part D premiums when your income is high. It is the hidden tax on a conversion that is too big.

IRMAA uses your MAGI from two years prior. So your 2026 Medicare premiums are based on your 2024 tax return, and a conversion you do in 2026 will raise your 2028 premiums. This two-year lag is why conversions done at 63 and 64 can sting at 65 and 66.

For 2026, the standard Part B premium is $202.90 per month, per the CMS 2026 premium fact sheet. Surcharges stack on top once MAGI passes $109,000 (single) or $218,000 (joint), with five tiers and a top tier starting at $500,000 (single) or $750,000 (joint), according to the 2026 IRMAA guide. The combined Part B and Part D surcharge can run from about $1,148 to $6,936 per person per year.

IRMAA is a cliff, not a ramp. Go even $1 over a tier threshold and you pay the full higher surcharge for the whole year — for both spouses. The fix is to calculate your conversion ceiling so your MAGI lands just under the next IRMAA tier, as advisors recommend in this Forbes analysis.

Worked Example: The Gap-Year Conversion

Numbers make this real. Here is the math IRS.gov will not show you.

Meet Daniel and Priya, both 62, married filing jointly, living in California. Daniel retired in late 2025. In 2026 their only income is $30,000 of interest and dividends. They hold $1.8 million in his traditional 401(k), rolled to an IRA. They want to convert at a low rate before RMDs hit at 73.

Step 1 — find taxable income before converting. Income of $30,000 minus the $31,500 standard deduction leaves them at $0 taxable income, so there is room to convert cheaply.

Step 2 — pick a ceiling. They want to stay inside the 24% bracket, which for 2026 MFJ tops out at $403,550 of taxable income. After the standard deduction, that means a total income of about $435,000.

Step 3 — check IRMAA. A MAGI near $435,000 in 2026 lands them in a high IRMAA tier that hits in 2028. They decide the future RMD savings is worth one year of surcharge, but they could instead cap MAGI just under a lower tier to avoid it.

Step 4 — the federal tax. Converting roughly $405,000 (on top of the $30,000) produces about $80,000 in federal tax — a blended rate near 20%. Those same dollars, taken as an RMD at 73 on top of Social Security and a pension, could easily be taxed at 35%, costing $140,000-plus. By converting in the gap year, they save roughly $60,000 in lifetime federal tax on that slice, before counting decades of tax-free Roth growth.

Worked Example: The California State Bite

Always separate federal from state. California does not give Roth conversions any special break. The state taxes a conversion as ordinary income at rates up to 13.3%, and there is no California estate tax to worry about, but the income tax bite is among the highest in the nation.

Meet Sofia, 64, single, a recently retired San Francisco executive. She converts $150,000 in 2026 in a low-income year. Federally, much of it falls in the 22% and 24% brackets. But California adds its own tax on the full $150,000, roughly $13,000 to $15,000 at her marginal state rate.

The lesson is timing across state lines. A high earner planning to move from California to a no-income-tax state like Nevada, Texas, or Florida should usually wait and convert after establishing residency in the new state. Doing so can erase the entire state tax on the conversion — a five-figure swing on a large conversion. California aggressively audits part-year residency, so the move must be real and documented before you convert.

The Backdoor Roth for Blocked High Earners

If your income is too high to contribute to a Roth directly, the backdoor Roth is your workaround. It is a two-step move: you contribute to a traditional IRA (which has no income limit on contributions), then convert that money to a Roth IRA right away.

For 2026, the IRA contribution limit is $7,500, or $8,600 if you are 50 or older, per the IRS contribution limits page. You contribute non-deductible dollars to the traditional IRA, then convert to Roth before the money earns much. Because you already paid tax on those dollars, the conversion itself is mostly or fully tax-free.

This is the cleanest way for a high earner to keep funding a Roth every year. As STWserve explains, the same MAGI ceilings that block direct Roth contributions — $153,000 single, $242,000 joint for 2026 — do not block the backdoor route at all.

The Pro-Rata Rule That Wrecks Backdoor Roths

Here is the landmine. The pro-rata rule says the IRS looks at all your traditional, SEP, and SIMPLE IRAs combined when you convert. You cannot cherry-pick only the after-tax dollars.

If you have any pre-tax IRA money, part of your “tax-free” backdoor conversion becomes taxable, in proportion to how much of your total IRA balance is pre-tax. Example: you put $7,500 of after-tax money in, but you also have $142,500 of pre-tax IRA money. Your IRA is then 95% pre-tax, so 95% of your $7,500 conversion — about $7,125 — is taxable, even though you tried to convert only the new money.

The consequence is a surprise tax bill and a confused return. The common misconception is that the dollars are tracked separately by account; they are not, they are pooled. The fix is to first “clean up” pre-tax IRA money by rolling it into your current employer’s 401(k) before December 31, since 401(k) balances are not counted in the pro-rata math. You report all of this on Form 8606, the form that tracks your after-tax basis.

The Mega Backdoor Roth: The Power Move

The mega backdoor Roth is the heavyweight version, and it is built for high earners with the right 401(k) plan. It lets you push tens of thousands of extra dollars into Roth each year — far beyond the normal limits.

It works in two steps inside your 401(k). First, after maxing your regular salary deferral ($24,500 for 2026, or $32,500 at 50+), you make after-tax contributions up to the total plan limit. For 2026, the total 401(k) contribution limit is $72,000, or $80,000 if 50 or older, and $83,250 for ages 60 to 63. Second, you convert those after-tax dollars to Roth through an in-plan Roth rollover or an in-service rollover to a Roth IRA.

The leftover after-tax room you can add is up to $47,500 for 2026, per NerdWallet’s breakdown. Two conditions are non-negotiable: your plan must allow after-tax contributions, and it must allow in-plan conversions or in-service withdrawals. Many plans do not, so check your summary plan description first. Convert the after-tax money quickly, because any earnings on it before conversion are taxable.

Three Common Scenarios

Here are the three situations high earners hit most often, with the result of each.

The Peak-Earning Executive Who Converts Anyway

Conversion Move	Tax Result
Converts $200,000 on top of a $450,000 salary	Dollars taxed at 35%, costing about $70,000 federal plus California tax — a costly mistake in a peak year
Skips the direct conversion, uses mega backdoor Roth instead	Gets up to $47,500 into Roth at no extra marginal cost, keeping MAGI flat

The takeaway is that high-salary years are for backdoor strategies, not direct conversions.

The Retiree Filling the 24% Bracket

Conversion Move	Tax Result
Converts up to the top of the 24% bracket in a low-income year	Locks in a sub-24% blended rate, far below a future 35% RMD
Converts past the bracket into 32%	The last dollars cost 32% federal — usually not worth it unless future rates are higher

The Pre-Medicare Saver Watching IRMAA

Conversion Move	Two-Year-Later Result
Caps MAGI $1 under the next IRMAA tier	Avoids a surcharge of up to $6,936 per person for the year
Converts $1 over the tier threshold	Pays the full higher Medicare surcharge for both spouses, all year

Mistakes to Avoid

These errors cost real money. Each one is common and preventable.

Converting in a peak-salary year. Your dollars get taxed at your highest marginal rate, often 35% or 37%, when waiting would have cost far less.
Ignoring the pro-rata rule. A “tax-free” backdoor conversion becomes mostly taxable if you hold pre-tax IRA money, creating a surprise bill.
Blowing past an IRMAA cliff. Going $1 over a threshold triggers the full surcharge for both spouses two years later.
Paying the tax from the IRA itself. Using converted dollars to pay the tax shrinks the Roth and, if you are under 59½, adds a 10% penalty on the withheld amount.
Forgetting state tax. California taxes conversions up to 13.3%, and you cannot deduct it federally beyond SALT limits.
Skipping Form 8606. Without it, the IRS has no record of your after-tax basis, so you risk being taxed twice on the same dollars.
Converting too much in one year. A single huge conversion can spike you into the 37% bracket and the top IRMAA tier when spreading it over several years stays cheaper.
Missing the December 31 deadline. Unlike IRA contributions, a conversion must be completed within the calendar year — there is no April grace period.

Do’s and Don’ts

Do:

Do convert in low-income “gap years” between retirement and RMDs, because that is when your marginal rate is lowest.
Do calculate your IRMAA ceiling first, since the surcharge cliffs can wipe out the benefit if you overshoot.
Do pay the conversion tax from outside cash, so every converted dollar stays invested in the Roth.
Do roll pre-tax IRA money into a 401(k) before a backdoor conversion, because it sidesteps the pro-rata rule.
Do spread large balances over multiple years, to keep each year’s dollars in lower brackets.

Don’t:

Don’t convert in your highest-earning years, because you lock in the worst possible rate.
Don’t forget the two-year IRMAA lag, since today’s conversion raises premiums later, not now.
Don’t ignore state residency, because moving to a no-tax state first can save five figures.
Don’t convert money you will need within five years, because the Roth five-year rule can apply a penalty.
Don’t skip professional help on large conversions, since one bracket or IRMAA error can cost more than the fee.

Pros and Cons

Pros:

Tax-free growth and withdrawals, which compound for decades inside the Roth.
No lifetime RMDs on a Roth IRA, giving you full control over future income.
Lower future RMDs, because every converted dollar shrinks the taxable pre-tax balance.
Tax diversification, letting you pull from taxable, pre-tax, and Roth buckets to manage each year’s rate.
A tax-free inheritance for heirs, who otherwise face fully taxed inherited IRA withdrawals.

Cons:

A real tax bill today, which can be large and must be paid in cash.
Higher Medicare premiums, through the IRMAA surcharge two years later.
Possible loss of income-based benefits, since the conversion raises MAGI for that year.
Irreversibility, because recharacterizing a conversion was eliminated and cannot be undone.
Break-even risk, because the strategy fails if your future rate turns out lower than today’s.

Deadlines, Costs, and Timing

A conversion must be completed by December 31 of the tax year — there is no extension into April. Estimated tax on the conversion is generally due in the quarter you convert, or you can increase withholding to avoid an underpayment penalty.

Costs vary by approach. A do-it-yourself conversion through your custodian is free, but the planning is on you. A one-time conversion analysis from a fee-only CFP or CPA typically runs $500 to $2,500, and a multi-year conversion plan may cost more. Given that a single IRMAA or bracket error can cost thousands, professional help usually pays for itself on balances above roughly $500,000.

What to Do Next

Take these steps in order before December 31.

Pull your numbers. Estimate this year’s taxable income and your total pre-tax IRA and 401(k) balances.
Pick your ceiling. Decide which tax bracket and which IRMAA tier you will stay under for the year.
Clean up pre-tax IRAs if you plan a backdoor Roth, by rolling them into your 401(k) first.
Set aside the tax in cash so you never pay it from the converted funds.
Execute the conversion with your custodian, and confirm the amount in writing.
File Form 8606 with your return to record basis and report the conversion.
Call a CPA or CFP before any conversion above six figures, or any year involving a business sale or a state move.

Frequently Asked Questions

Is there an income limit on a Roth conversion in 2026?

No. There is no income limit and no dollar cap on conversions for 2026. The MAGI limits — $153,000 single and $242,000 joint — apply only to direct Roth contributions, not conversions.

Can high earners do a backdoor Roth in 2026?

Yes. High earners can contribute up to $7,500 ($8,600 if 50+) to a non-deductible traditional IRA in 2026, then convert it to Roth. The pro-rata rule applies if you hold other pre-tax IRA money.

How much does IRMAA cost in 2026?

Between about $1,148 and $6,936 per person in combined Part B and Part D surcharges for 2026, on top of the $202.90 standard Part B premium. It is based on MAGI from two years earlier.

When does a conversion affect my Medicare premiums?

Two years later. A conversion in 2026 raises your 2028 Medicare premiums, because IRMAA uses your tax return from two years prior.

What is the mega backdoor Roth limit for 2026?

Up to $47,500 of after-tax dollars, within the total 401(k) limit of $72,000 ($80,000 if 50+, $83,250 for ages 60–63). Your plan must allow after-tax contributions and in-plan conversions.

Does California tax Roth conversions?

Yes. California taxes the converted amount as ordinary income at rates up to 13.3%. There is no special state exclusion, so factor state tax into the total cost.

Can I undo a Roth conversion if I change my mind?

No. Recharacterizing a conversion was eliminated by the 2017 tax law. Once done, a conversion is permanent, so confirm the amount before you execute.

Should I pay the conversion tax from the IRA?

No. Pay it from outside cash. Using IRA dollars shrinks the Roth and, if you are under 59½, the withheld amount is treated as a taxable, penalized distribution.

What is the best year to convert?

A low-income “gap year” — typically after retiring but before Social Security and RMDs begin at 73 — when your marginal rate is lowest and you have room to fill a low bracket.

What form reports a Roth conversion?

Form 8606. You file it with your federal return to report the conversion and track any after-tax basis, which prevents being taxed twice on the same dollars.

Does converting reduce my future RMDs?

Yes. Every dollar moved to a Roth IRA leaves the pre-tax balance, so it is no longer subject to required minimum distributions starting at age 73.

Is a Roth conversion worth it if rates are already low?

Often yes, because OBBBA made the low brackets permanent in 2025, but the real test is whether your own future rate — driven by RMDs, pensions, and Social Security — will exceed today’s rate.

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