If you want to know why your CPA disagrees with strategic Roth conversions, the short answer is that your CPA is answering a different question than the one that governs your lifetime tax bill. A CPA is trained to minimize the tax you owe on this year’s return, while a strategic Roth conversion plan minimizes the tax a household pays across the rest of retirement. For seven-figure traditional IRAs, those goals often point in opposite directions.
Your CPA disagrees with strategic Roth conversions because tax preparation is an annual, backward-looking job focused on this year’s tax bill, while Roth conversion planning is multi-decade and forward-looking. A conversion adds taxable ordinary income now, raising this year’s return. The caution is faithful to the annual question, but it can leave a large pre-tax balance to grow into higher-taxed required minimum distributions later.
Why does my CPA disagree with Roth conversions?
Your CPA disagrees because tax preparation and tax planning are two different jobs. Preparation is annual and backward-looking: file an accurate return and minimize the tax owed this year. Planning is forward-looking across 20 to 40 years. A Roth conversion raises this year’s taxable income, so it looks wrong through the preparation lens even when it lowers lifetime tax.
Map Your Lifetime Tax Exposure
Our team has built more than 2,400 multi-year conversion plans for IRA Millionaire households — projections your CPA’s annual return work isn’t designed to produce. Find out what your lifetime tax picture actually looks like, with no product pitch and no obligation.
A CPA’s professional duty is an accurate return that reduces the tax owed for the year being filed, and by design the vast majority of the work is annual.
A strategic Roth conversion plan runs on a longer clock. It projects required minimum distributions across the household’s life, models survivor brackets after the first spouse passes, and layers in Social Security timing, Medicare thresholds, and the SECURE Act 10-year rule on inherited IRAs, then sizes this year’s conversion for the least tax over decades, not this April. This page takes a different angle from our companion piece on how a CPA’s advice could cost you millions.
Is my CPA wrong to keep this year’s tax bill low?
Your CPA is not wrong to keep this year’s tax bill low; the instinct is faithful to the wrong question. Picture this year’s taxable income as a glass of water. A Roth conversion pours measured water in, raising the level and the tax. Keeping the glass low is correct for the annual return, but it ignores where the water is stored and what forces a larger pour later.
From the preparation seat, a high water level means a high bill, so pouring more in feels reckless, and that is a correct answer to the question the CPA was asked. The problem is what the glass leaves out: the balance still sitting in the pre-tax account, and the forced withdrawals it creates later.
Will a Roth conversion push me into a higher tax bracket, and does that matter?
A Roth conversion can push you into a higher bracket, but a bracket is not a cliff. In 2026 only the converted dollars above the threshold are taxed at the higher rate; income below the line keeps its lower rate. A married couple stays in the 24% bracket up to $403,550 of taxable income, so crossing the line raises the rate only on the amount above it.
Picture a line across the glass marking the next bracket and the reflex to stop just short. That reflex misreads marginal rates: only income above the threshold is taxed at the higher rate. In 2026 the 24% bracket runs to $201,775 for single filers and $403,550 for married couples filing jointly, and the 32% bracket begins where the 24% bracket ends. For a household whose future RMDs will sit in the 32%, 35%, or 37% bracket for decades, paying 24% on the portion of a conversion that crosses a line can be a bargain, and a Roth conversion break-even analysis shows where that trade turns favorable.
Why do slow, small “safe” conversions often lose?
Slow, small conversions often lose because a 7% return on a $1.5 million IRA adds roughly $105,000 a year, outpacing a $50,000 to $80,000 tablespoon conversion. The pre-tax balance keeps growing while the household pays tax annually, and a drip that parks modified adjusted gross income just over an IRMAA line can keep Medicare surcharges running for the whole sequence.
To avoid crossing a line, the common advice is a tablespoon instead of a full pour, but the downside is structural. Because a 7% return on a $1.5 million IRA adds about $105,000 a year, a tablespoon conversion cannot keep up, and several years in the balance can be larger than when conversions began, with tax paid every year for the same RMD outcome or worse.
The tablespoon also tends to park MAGI just above an IRMAA threshold for the whole sequence. In 2026, IRMAA surcharges on Medicare Part B (base premium $202.90 per month) begin above $109,000 MAGI single and $218,000 joint, on a two-year lookback. A compressed plan might cross that line for only a few years. Deciding how much to convert to Roth each year is the calibration a drip skips.
What is my CPA’s one-year view leaving out?
The one-year view leaves out the two jars behind every conversion. The first jar holds the pre-tax IRA and 401(k) balance; the second holds Roth money that grows tax-free. A conversion moves water from the pre-tax jar to the Roth jar and pours a proportional amount into this year’s glass. Watching only the glass lets the pre-tax jar keep growing unchecked.
The glass shows this year’s tax, not where the water is stored, so watching only the glass lets the pre-tax jar keep growing until something forces a pour. A conversion is uncapped, irreversible, and must be completed by December 31, so each year’s sizing is permanent, as our note on the 2026 Roth conversion deadline explains.
What happens when RMDs take over at 73?
At RMD age (73 in 2026, and 75 for those born in 1960 or later, first applying in 2035) the IRS takes over the pour. Required minimum distributions are calculated from the IRS Uniform Lifetime Table applied to the pre-tax balance and paid every year. If the jar grew untouched for a decade, that forced income can stack onto Social Security and push the household into higher brackets and IRMAA tiers for life.
At RMD age (currently 73), the IRS applies the Uniform Lifetime Table to the pre-tax jar, paid annually for life, and a conversion cannot satisfy an RMD. If the jar grew for 10 or 15 years, the first RMD can be far larger than expected, stacking on Social Security to push MAGI into higher brackets and IRMAA tiers for years. Our overview of required minimum distributions in 2026 covers the mechanics.
How does the “widow’s trap” magnify the cost?
The widow’s trap magnifies the cost because when the first spouse passes, the survivor inherits the same pre-tax jar but files as a single taxpayer. Single-filer 2026 brackets and the $109,000 IRMAA threshold hit at roughly half the joint income levels. The same RMD income that sat in the 24% joint bracket can land in the 32% or 35% single bracket, with added Medicare surcharges.
The cost compounds at the first death. The survivor inherits the same balance and a similar RMD but now files single, and single-filer brackets and IRMAA thresholds arrive at far lower income levels.
In 2026, a married couple stays in the 24% bracket up to $403,550 of taxable income, while a single filer reaches the 32% bracket above $201,775 and 35% above $256,225, and the IRMAA line drops from $218,000 joint to $109,000 single. The same forced RMD income that was comfortable jointly can jump two brackets and trigger surcharges. Very few articles name this survivor trap, yet it is one of the largest lifetime-tax drivers for couples.
What does strategic Roth conversion planning actually do?
Strategic Roth conversion planning shifts the frame from the glass to the jars. It projects RMDs year by year, models survivor single-filer brackets, coordinates Social Security timing, maps IRMAA exposure, and stress-tests against future tax-rate changes. The output is a multi-year conversion sequence calibrated to lower the pre-tax jar before RMDs begin, rather than a single-year bracket fill.
The work usually runs several steps together:
- Projecting RMDs across the full retirement horizon, year by year
- Modeling survivor brackets for the years after the first spouse passes
- Coordinating Social Security timing with the conversion years
- Mapping IRMAA exposure across the sequence, on the two-year lookback
- Stress-testing against future tax-rate changes rather than assuming today’s rates hold forever
- Intentionally filling brackets now, sometimes crossing higher brackets in select years, to lower the pre-tax jar before RMDs begin
A full projection may also weigh the net investment income tax (3.8% above $200,000 single or $250,000 joint MAGI in 2026); a conversion is not itself net investment income but can raise MAGI enough to expose other investment income to the surtax. Because every situation differs, there is no one-size-fits-all answer.
How much can this really save? A $1.2M lifetime case study
A hypothetical illustration shows the scale. For a married couple with a large seven-figure pre-tax IRA, a “play it safe” annual approach might project roughly $2.0 million in lifetime federal tax, while a multi-year strategic sequence might project about $0.8 million, a difference near $1.2 million. This is an illustration only, not a projection of any specific result, and actual outcomes vary widely.
Consider a hypothetical couple with a substantial seven-figure balance. A play-it-safe annual approach keeps small partial conversions under the next bracket line and leaves the jar largely intact. A strategic multi-year plan converts more in select years that cross bracket and IRMAA lines, lowering the jar before RMDs begin, as the table compares.
| Factor | Scenario 1: Play It Safe | Scenario 2: Strategic Plan |
|---|---|---|
| Planning frame | Annual (the glass) | Lifetime (the jars) |
| Conversion pace | Small partials under the bracket line | Multi-year sequence sized to lower the jar |
| Pre-tax jar at RMD start | Largely intact | Substantially lowered |
| Survivor and IRMAA exposure | Higher, left unaddressed | Reduced by shrinking the jar early |
| Illustrative lifetime federal tax | ~$2.0M | ~$0.8M |
| Illustrative difference | n/a | ~$1.2M |
The difference in this illustration came from changing the question, not from a better CPA: the lifetime question only gets answered when the frame shifts from the glass to the jars. Figures are illustrative and depend on each household’s balances and assumptions.
Common mistakes to avoid
Common mistakes include treating a bracket crossing as a cliff, relying on annual deductions to solve a lifetime problem, letting the pre-tax jar grow untouched while managing this year’s glass, and ignoring the survivor widow’s trap. Each error quietly raises lifetime tax for a seven-figure IRA even when this year’s return looks well optimized.
- Treating a bracket crossing as a cliff. Only income above the line is taxed at the higher 2026 rate; refusing to cross at any cost is rarely optimal.
- Relying on annual deductions to manage a lifetime problem. Loss harvesting and deduction timing move this year’s bill modestly, rarely the lifetime bill.
- Letting the pre-tax jar grow while managing the glass. The math depends on the jar’s size the year RMDs begin, not the glass the year before.
- Underestimating the widow’s trap. Survivor single-filer brackets compound the cost of leaving the jar large.
- Paying conversion tax from inside the IRA. Paying from non-IRA funds keeps more money compounding tax-free in the Roth jar.
Frequently asked questions
Why do financial advisors advise against Roth conversions?
Many advisors and CPAs advise against Roth conversions because a conversion adds taxable income now and the default view is the annual return, not a lifetime projection. That can fit smaller balances. For a seven-figure IRA, skipping conversions often leaves a large pre-tax balance to grow into higher-taxed RMDs and survivor brackets later.
At what age does a Roth conversion not make sense?
A Roth conversion may make less sense once the two-year IRMAA lookback ties the conversion year to a Medicare premium, so the last conversion year that never affects a premium is roughly age 62. Conversions can still make sense later when the lifetime math supports them, so age alone is not the deciding factor.
Does a Roth conversion increase my Medicare premiums?
A Roth conversion can increase Medicare premiums because converted dollars raise modified adjusted gross income, and 2026 IRMAA surcharges on Part B and Part D apply above $109,000 MAGI single and $218,000 joint, on a two-year lookback. A well-designed sequence may cross that line for only a few years.
Is it better to do a Roth conversion all at once or spread over several years?
Neither is automatically better; the right pace depends on the numbers. Very small conversions can lose when a 7% return on a large IRA outpaces them and keeps MAGI parked over an IRMAA line for years. A compressed multi-year sequence can lower the balance faster, and a projection shows which pace fits.
Do I need a CPA or a financial advisor for a Roth conversion?
Many households benefit from both. A CPA prepares the accurate annual return and reports the conversion, while a planning-focused advisor builds the multi-decade projection of RMDs, survivor brackets, Social Security, and IRMAA that sizes it. Most tax software is built for annual returns, so the two roles coordinate rather than compete.
Will a Roth conversion push me into a higher tax bracket?
A Roth conversion can push you into a higher bracket, but only the converted dollars above the threshold are taxed at the higher 2026 rate; the rest of your income keeps its lower rate. A married couple stays in the 24% bracket up to $403,550 of taxable income, so crossing a line now can still lower lifetime tax.
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Q3 Advisors is a registered investment adviser focused on retirement tax planning. This page is educational and is not advice; consult a qualified professional.
