Roth Conversion Strategies at $3M+: 5 Smart Retirement Moves That Backfire

Written by Dan PasconeNovember 9, 2026

Retirement planning checklist on a desk with financial statements, planning books, glasses, a pen, and coffee.

TL;DR

Once your forced retirement income (required minimum distributions plus Social Security) is on track to exceed what you spend, the standard retirement playbook starts working against you.

For most executive couples, that line arrives around $3 million, especially with $1.5 to $2 million in pretax accounts.
Past the line, five "responsible" moves can backfire: defaulting to pretax 401(k) savings, spending taxable accounts first, paying off a low-rate mortgage from an IRA, avoiding IRMAA at all costs, and trimming spending to fit the 4% rule.
The fix is deliberate Roth conversions, smarter withdrawal order, and filling tax brackets and IRMAA tiers on purpose.

There's a moment in a lot of our client conversations where the room goes quiet. It usually comes right after someone walks us through their plan. They've maxed the 401(k) for twenty years. They're paying off the house the day they retire. They'll spend the brokerage account first, leave the IRA alone, and stay under the Medicare surcharge line.

Every one of those moves is the right call for most retirees. That's what makes this tricky.

Once your balance sheet crosses a certain point, the rules flip, and nobody tells you when it happens. You keep following advice built for someone with half your money, and it quietly costs you six or seven figures in lifetime tax, or keeps you working years longer than you need to.

Where the line actually is

People ask us whether the number is $2 million, $3 million, or $5 million. It isn't a portfolio number.

The rules flip when your forced income, meaning required minimum distributions (RMDs) plus Social Security, is on track to exceed what you actually spend. At that point, your problem isn't running out of money. It's the IRS deciding when and how fast your money comes out.

For most executive couples, that starts around $3 million, especially with $1.5 to $2 million in pretax accounts.

Meet Mark and Alina: $4.2 million and a plan that looked responsible

Mark is 60 and recently retired as a VP of Sales. Alina is 58, an SVP in tech, planning to work three more years. They spend about $220,000 a year and carry a $420,000 mortgage at 2.9%. Here's their $4.2 million:

Pretax accounts: $2.4 million
Taxable account: $1.2 million, mostly company stock from vested RSUs
Roth: $250,000
Cash: $350,000

If that $2.4 million pretax balance grows at 5% untouched, it's roughly $5 million by Mark's RMD age of 75. That means a first-year required withdrawal of about $200,000, before Social Security. They're on the other side of the line.

In this video, Dan walks through Mark and Alina's full plan and the five moves we changed

Here's how each of the five "smart" moves played out for them.

Move 1: The pretax 401(k) reflex

The standard advice is to max your pretax 401(k) and lower today's tax bill. Alina is in the 35% bracket, so her pretax deferral still earns its keep.

The problem is treating pretax as the only lever. Every pretax dollar she adds makes the $5 million RMD problem bigger.

Her plan allows after-tax contributions with in-plan Roth conversions, often called the mega backdoor Roth. In 2026, the total 401(k) limit is $72,000. After her $24,500 deferral and a roughly $14,000 match, she has about $33,500 of room to send to Roth. And because she earned over $150,000 last year, her $8,000 catch-up contribution must go to Roth anyway. (Our mega backdoor Roth 2026 guide covers the limits in detail.)

Over three years, that's more than $120,000 growing tax-free and never touched by an RMD. Not every plan allows this, so check your plan documents.

Why does Roth matter so much? Brackets are low today, but "permanent" in tax law only lasts until the next Congress. And even if federal rates never move, yours can: when one spouse passes and the survivor files single, or when your kids inherit an IRA during their peak earning years.

Move 2: Spending taxable first and paying off the mortgage

The textbook withdrawal order says spend taxable first, then the IRA, then Roth. For Mark and Alina, that means selling RSU stock with about $900,000 of unrealized gain and paying capital gains tax plus the 3.8% net investment income tax. Meanwhile, the IRA keeps compounding.

So we flip it. Once Alina stops working, their taxable income drops to almost nothing. That's the window to draw from the IRA first, filling the 22% and 24% brackets on purpose, and hold the low-basis stock.

The reason is what happens at death. Under current law, if they still own the stock, their kids get a step-up in basis and that embedded gain essentially disappears. The IRA gets no step-up, and the kids generally must empty it within 10 years, often during their own peak earning years.

The mortgage follows the same logic. To net $420,000 from the IRA, they'd pull roughly $600,000, pay about $175,000 in tax in what should be a low-tax year, and raise Mark's future Medicare premiums by more than $6,000 for a year. All to eliminate about $12,000 a year in interest.

The better move is usually to keep the mortgage, fund payments from their 0–2 year liquidity band, and pay it down in pieces using bracket room already planned. Being debt-free is a feeling, and sometimes a feeling is worth paying for. Just know the price first.

Move 3: The IRMAA dodge

IRMAA is the income-related surcharge on Medicare Part B and Part D. It works like a cliff: go $1 over a threshold and you pay the higher premium all year. It also looks back two years, so your income at 63 sets your premiums at 65.

In 2026, the first threshold for married couples is $218,000 of modified adjusted gross income (MAGI). If Mark and Alina stayed under it, they'd barely convert anything during their lowest-income years.

Instead, we fill to just below a higher tier:

The cost: using 2026 figures, converting up to about $410,000 of MAGI costs roughly $385 a month per person in surcharges, about $9,200 a year for both.
The math: spread across the extra $190,000 converted, that's about 5 percentage points.
The comparison: those dollars cost around 29% all-in, versus 32% to 35% later as RMDs, or more at single-filer rates.

IRMAA is a surcharge you plan around, not a tax rate to fear. Just don't overshoot a tier by $5,000.

Move 4: Trimming spending to fit the 4% rule

Four percent of $4.2 million is $168,000. Mark and Alina spend $220,000 and want to spend more over the next decade on travel and helping their kids. By the 4% rule, they're overspending, which is a big reason Alina planned three more years.

But that rule was built for a worst-case 30-year stretch with flat spending. It ignores three things that matter here:

Social Security will eventually cover close to half their spending. - Spending naturally tapers with age.
RMDs will force money out anyway.

Modeled conservatively, their bigger risk isn't running out. It's leaving a far larger estate than intended and saying no to the years they saved for: wealthy on paper, poor in experience. (We explain why we prefer risk-based guardrails over a fixed withdrawal rule.)

So we prefund their 0–2 and 3–5 year liquidity bands, the first two of the four time-based buckets in our Life Driven Investing (LDI) approach, so a down market never forces a sale. Then Alina's question changes from "Can I afford to stop?" to "What do I want the next chapter to look like?" Maybe that's three more years. Maybe it's a fractional role or board seats. That's hybrid retirement: work becomes optional, purpose doesn't.

Move 5: Giving cash instead of appreciated stock

If you give, give appreciated stock instead of cash. You avoid the capital gains, and for Mark and Alina it chips away at their concentrated RSU position at the same time.

Consider bunching several years of gifts through a donor-advised fund, especially with the new rule that ignores the first 0.5% of AGI in charitable deductions. And at 70½, qualified charitable distributions let you give straight from an IRA, which counts toward RMDs without adding to taxable income.

What most people miss: the final working year sets your Medicare bill

Alina's final working year, with her last bonus and RSU vest, is exactly the year Medicare will look back on two years later. Left alone, that high-income year can trigger top-tier IRMAA surcharges just as her income collapses.

Retiring counts as a life-changing event. That means they can file Form SSA-44 with Social Security and ask for premiums based on their lower current income. It's a one-page form, and most retirees never hear about it.

The bigger lesson: none of Mark and Alina's original plan was bad. That's what made it dangerous. Each move looked responsible on its own. Together, they compound slowly, then all at once, and hit twice as hard the day one spouse files single.

The five moves at a glance

Move	Standard advice	Past the $3M line

401(k) savings	Max pretax by default	Balance pretax with mega backdoor Roth
Withdrawal order	Spend taxable first	Draw IRA first, hold low-basis stock
Mortgage	Pay it off at retirement	Keep it, pay down with bracket room
IRMAA	Stay under the first tier	Fill to just below a higher tier
Spending	Fit the 4% rule	Prefund near-term bands, spend on purpose

Key takeaways

The line isn't a portfolio number. It's when RMDs plus Social Security will exceed what you spend.
Past that line, balance pretax and Roth on purpose. Every extra pretax dollar enlarges future RMDs.
Draw from the cheapest lifetime dollar for you and your kids, which often means IRA before low-basis stock.
Treat IRMAA as a surcharge to plan around, and fill bracket room and IRMAA tiers deliberately.
Prefund the next 0–2 and 3–5 years so the question becomes what you want next, not whether you can afford to stop.

Frequently asked questions

How do I know if I have an RMD problem?

Project your pretax balance to your RMD age (73 or 75, depending on birth year) and divide by the IRS life expectancy factor, then add expected Social Security. If that forced income exceeds what you plan to spend, you likely have one. For Mark and Alina, $2.4 million today becomes about $5 million and a $200,000 first-year RMD.

Should I keep contributing pretax to my 401(k) if I already have $2 million or more pretax?

Often, yes, but not by default. In a 35% bracket, the deduction still has value. The question is whether some of your contribution room should go to Roth instead, through Roth deferrals, catch-ups, or a mega backdoor Roth, so your future RMDs don't keep growing.

Is it worth paying IRMAA to do bigger Roth conversions?

It can be. IRMAA adds a fixed surcharge per tier, so the real question is the all-in cost per converted dollar. In Mark and Alina's case, converting up to about $410,000 of MAGI cost around 29% all-in, compared with 32% to 35% on future RMDs. Our guide on when a Roth conversion actually makes sense shows how Tailored Wealth sizes these windows.

Should I pay off my mortgage when I retire?

If the payoff money comes from pretax accounts, run the numbers first. Pulling a large lump sum can push you into high brackets and Medicare surcharges for a year. With a low fixed rate, paying it down gradually with planned bracket room is usually cheaper, though some people reasonably value being debt-free more.

Is the 4% rule too conservative for a $4 million portfolio?

For many couples with substantial Social Security, tapering spending, and large future RMDs, it can be. The rule assumes a worst-case 30-year period and flat spending, so it can push people to underspend and work longer than they need to.

Who this is for

This is for executives and senior leaders in their late 50s and early 60s with $2 million to $3 million or more saved, mostly in pretax accounts, who are retired or within a few years of stepping back. If your plan follows the standard retirement playbook and nobody has tested it against your real numbers, these five moves are the place to start.

Find out which side of the line you're on

At Tailored Wealth, this is the work we do. We use professional planning software to model your actual numbers in one place: RMD projections, multi-year tax brackets, IRMAA tiers, equity positions, and withdrawal sequencing. Then we map your goals into liquidity bands so the next 1, 5, and 10+ years are funded before a market decides for you, and we revisit it every quarter, because the right move at 58 isn't the right move at 63.

If you'd like to see how these five moves apply to your situation, book a Free Wealth Strategy Call. We'll identify the two or three decisions that matter most right now. It's a working session, not a pitch, and if we're not a fit, we'll tell you.

Learn About Hybrid Retirement Here!

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