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A Roth conversion is one of the most powerful tax-planning tools available to retirees with significant wealth — and right now, in mid-2026, the window for executing one at a favorable rate may be narrowing faster than most people realize. If you have between $1 million and $5 million in investable assets and a substantial portion sitting in tax-deferred accounts like traditional IRAs or 401(k)s, this article is written specifically for you.
We’ll walk through the actual math, explain why the timing matters so much this year, and show you how to avoid the costly mistakes that derail even the most well-intentioned conversions.
Why the 2026 Tax Environment Makes Roth Conversion Uniquely Compelling
The Tax Cuts and Jobs Act of 2017 (TCJA) created historically low individual income tax brackets that have been in effect for nearly a decade. Unless Congress acts, these rates are scheduled to sunset after December 31, 2025 — meaning most retirees are already operating in the first full year of potentially higher permanent rates, or are watching legislation closely for any extension or modification.
For high-net-worth retirees, the implication is significant. A single filer currently in the 32% bracket today could face a 35% or higher rate on the same income if rates revert or if new legislation pushes brackets upward. Every dollar you convert today at today’s rate is a dollar shielded from tomorrow’s potentially higher rate.
The Sunset Effect: What It Means for Your Roth Conversion Strategy
The sunset of TCJA provisions has been the subject of intense Congressional debate throughout 2025 and into 2026. As of mid-2026, the legislative landscape remains fluid. Even if some provisions are extended, the uncertainty itself is a planning signal.
In my experience working with clients in the $1M–$5M range, waiting for certainty is often the most expensive decision they make. The clients who acted on partial information — with appropriate guardrails — almost always fare better than those who waited for the “perfect” moment.
How Bracket Management Drives Roth Conversion Decisions
For 2026, the key federal income tax brackets for married filing jointly are approximately:
- 22% bracket: Taxable income up to approximately $201,050
- 24% bracket: Taxable income up to approximately $383,900
- 32% bracket: Taxable income up to approximately $487,450
- 35% bracket: Taxable income above approximately $487,450
- 37% bracket: Taxable income above approximately $731,200
A strategic Roth conversion fills the space between your current income and the next bracket threshold. For a married couple with $180,000 in combined Social Security, pension, and investment income, converting up to approximately $203,900 more would keep them within the 24% bracket — one of the most favorable rates available for high earners.
Consult a qualified tax professional to model your specific bracket fill opportunity before executing any conversion.
The Real Math: How Much Can a Roth Conversion Save a $2M Retiree?
Let’s ground this in concrete numbers. Consider a married couple, ages 67 and 64, with:
- $1.8 million in traditional IRAs
- $400,000 in taxable brokerage accounts
- $200,000 in existing Roth IRAs
- Combined Social Security income: $72,000/year
- No required minimum distributions yet (RMDs begin at age 73 under current law)
This couple is in a classic “conversion sweet spot” — income is relatively low before RMDs begin, but a large IRA will generate substantial forced distributions starting in six years.
Roth Conversion vs. Doing Nothing: A Direct Comparison
| Scenario | Do Nothing | Convert $150K/Year for 6 Years |
|---|---|---|
| IRA Balance at Age 73 | ~$2.4M (assuming 5% growth) | ~$1.5M traditional + $1.1M Roth |
| Estimated Annual RMD | ~$92,300 | ~$57,700 (from traditional only) |
| IRMAA Risk (Medicare surcharge) | Likely Tier 3–4 surcharge | Potentially Tier 1 or none |
| Federal Tax Rate on RMDs | 32–35% bracket likely | 22–24% bracket manageable |
| Surviving Spouse Tax Risk | Single filer rates on full RMD | Significantly reduced exposure |
| 10-Year Heir Tax Burden (SECURE Act) | Full ordinary income tax | Roth inheritance is tax-free |
The numbers above are illustrative, not guaranteed. Every household’s tax situation differs. But the directional math is consistent: proactive Roth conversions in the 24% bracket typically outperform inaction when RMDs would otherwise push income into the 32%+ brackets.
For more on how RMD rules work under current law, see the IRS guidance on Required Minimum Distributions.
The Surviving Spouse Problem That Most Advisors Miss
One of the most overlooked drivers of a Roth conversion strategy is what happens when one spouse dies. The surviving spouse immediately moves from married filing jointly to single filer status — but their income often doesn’t drop proportionally.
A widow or widower with a $2M traditional IRA, one Social Security benefit, and a pension can easily find themselves in the 32% or even 35% bracket as a single filer. Roth conversions during the married years are, in many cases, the most efficient form of “tax insurance” available.
IRMAA: The Hidden Tax That Roth Conversion Can Help You Avoid
If you’re approaching or already in Medicare, Income-Related Monthly Adjustment Amounts (IRMAA) are a direct financial consequence of high reported income. IRMAA surcharges apply to Medicare Part B and Part D premiums and are calculated using your Modified Adjusted Gross Income (MAGI) from two years prior.
2026 IRMAA Thresholds and How Roth Conversions Affect Them
For 2026, the IRMAA surcharge tiers for Medicare Part B begin at approximately $106,000 for single filers and $212,000 for married filing jointly. At the highest income tier, a married couple can pay over $10,000 per year in additional Medicare premiums — a cost that compounds over a multi-decade retirement.
Because Roth IRA withdrawals do not count toward MAGI, a well-executed Roth conversion strategy during pre-Medicare or early-Medicare years can dramatically reduce lifetime IRMAA exposure. The tradeoff: the conversion itself generates taxable income in the year it is executed, which must be carefully managed so it doesn’t trigger its own IRMAA surcharge two years later.
Download our Medicare IRMAA Planning Guide to understand the exact thresholds and how conversion timing interacts with your Medicare costs.
Consult a qualified tax and Medicare planning professional before executing any conversion with IRMAA implications.
Roth Conversion Timing and the Two-Year IRMAA Look-Back
IRMAA is assessed using income from two years prior. This means a large Roth conversion executed in 2026 will affect your 2028 Medicare premiums. Coordinating conversion size with this look-back period is one of the most technically demanding aspects of HNW retirement planning.
A multi-year conversion ladder — spreading the converted amount across five or six tax years — typically produces better IRMAA outcomes than a single large conversion, even if the total tax paid is similar. For more background on Medicare planning, Kiplinger’s Medicare resource center offers a solid overview of how surcharges are calculated.
The SECURE Act 2.0 and Inherited IRA Rules: Why Your Heirs Need You to Convert
The SECURE Act 2.0 fundamentally changed the inherited IRA landscape. For most non-spouse beneficiaries, the 10-year rule now applies: the entire inherited IRA must be distributed within 10 years of the original owner’s death. For adult children inheriting a $1.5M traditional IRA, this can mean $150,000 or more in forced taxable income every year for a decade — often at their highest earning years.
How a Roth Conversion Protects Your Beneficiaries
Roth IRAs inherited by non-spouse beneficiaries are also subject to the 10-year rule. The critical difference: qualified Roth distributions are income-tax-free. A child inheriting a $1M Roth IRA distributes $100,000 per year for 10 years with zero federal income tax on those withdrawals.
Compare that to a $1M traditional IRA where the same distributions could be taxed at 32%–37% if the child is in their peak earning years. The after-tax value difference can easily exceed $300,000–$400,000 over the 10-year distribution window.
For clients engaged in multi-generational wealth planning, this inherited IRA dynamic is often the single most compelling reason to execute a Roth conversion today rather than defer.
You can review the current IRS guidance on inherited IRA distribution rules at the IRS beneficiary RMD guidance page.
Pairing Roth Conversions with Charitable Giving Strategies
High-net-worth retirees often benefit from layering a Roth conversion with qualified charitable distributions (QCDs) or donor-advised fund (DAF) contributions in the same tax year. Here’s the basic logic:
- QCDs (up to $105,000 per person in 2026) satisfy RMDs without adding to taxable income
- Reducing reportable income from RMDs creates more “bracket room” for a larger Roth conversion
- DAF contributions can offset the taxable income generated by a conversion in years with significant charitable intent
This kind of integration — where charitable giving, tax planning, and Roth conversion strategy reinforce each other — is exactly the type of sophisticated coordination our comprehensive wealth management services are designed to deliver.
Common Mistakes That Derail High-Net-Worth Roth Conversions
Even financially sophisticated retirees make costly errors when executing Roth conversions without proper modeling. Here are the most common:
Mistake 1: Converting Too Much in a Single Year
Crossing a bracket boundary mid-conversion is surprisingly easy when you account for Social Security income, dividend income, and capital gains. A conversion that looks like it stays within the 24% bracket can push into 32% if other income sources aren’t modeled carefully.
Mistake 2: Ignoring State Income Tax
Florida has no state income tax — a significant advantage for retirees here. But clients who recently relocated from high-tax states like New York, California, or New Jersey sometimes execute large conversions before their domicile change is complete, triggering state tax unnecessarily. Proper domicile planning before conversion can save tens of thousands.
Mistake 3: Paying Conversion Taxes from the IRA Itself
If you withhold taxes from the converted amount to pay the IRS, you reduce the dollars actually converted to Roth — and potentially trigger a 10% early withdrawal penalty if you’re under 59½. Always pay conversion taxes from outside the IRA, ideally from a taxable account with low-cost-basis assets.
Mistake 4: Failing to Model Multi-Year Scenarios
A single-year conversion analysis is almost never sufficient. The optimal strategy requires modeling Roth conversions over 5–10 years simultaneously, accounting for IRA growth, changing income sources, Medicare premium impacts, and estate tax implications. This is where working with a fiduciary advisor who builds multi-year projections — rather than a commission-based broker — makes a material difference in outcomes.
Mistake 5: Not Considering Net Investment Income Tax (NIIT)
High earners may also be subject to the 3.8% Net Investment Income Tax. While Roth conversion income is not directly subject to NIIT, pushing AGI higher can cause more investment income to become subject to it, effectively raising the marginal cost of conversion. This interaction is often overlooked in simplified tax projections.
How to Structure a Roth Conversion Ladder for the $1M–$5M Retiree
The most effective Roth conversion approach for high-net-worth retirees is typically a multi-year ladder — not a single large conversion. Here’s a general framework:
Step 1: Establish Your Baseline Income
Identify all sources of income that will appear on your tax return in any given year: Social Security, pensions, rental income, dividends, capital gains distributions. This is your “floor” before any conversion is added.
Step 2: Determine Your Target Bracket Ceiling
For most HNW retirees, the 24% or 32% bracket top is the conversion target. Calculate the gap between your floor income and that ceiling — that is your maximum efficient conversion amount for the year without entering a higher bracket.
Step 3: Model the IRMAA Impact
Run the conversion amount through the IRMAA brackets to see how the added income will affect Medicare premiums two years out. Adjust the conversion size if the additional IRMAA cost offsets the tax benefit.
Step 4: Confirm You Can Pay Taxes from Outside the IRA
Identify liquid, low-tax-cost assets in your taxable account to fund the conversion tax bill. This preserves the full converted amount inside the Roth account and maximizes compounding.
Step 5: Repeat Annually and Adjust
Income, brackets, account balances, and legislation all change. A Roth conversion ladder requires annual review and recalibration. The clients who benefit most from this strategy are those who treat it as an ongoing process, not a one-time event.
For additional research on Roth conversion planning, Fidelity’s Roth conversion learning center offers helpful background on the mechanics and tax treatment.
Frequently Asked Questions About Roth Conversion Strategy
What is the best age to do a Roth conversion for a high-net-worth retiree?
The optimal window for a Roth conversion is typically between retirement and age 73 — when income is lower before RMDs begin but while tax brackets remain manageable. Retirees in their early-to-mid 60s who have recently left high-income careers are often ideal candidates for beginning a multi-year conversion ladder.
How does a Roth conversion affect Social Security taxes?
A Roth conversion adds to your provisional income, which can cause more of your Social Security benefit to become taxable — up to 85% of your benefit. This interaction must be modeled before executing any conversion, as it effectively raises the marginal cost of conversion beyond the stated bracket rate.
Can I do a Roth conversion if I’m already taking RMDs?
Yes, but you must take your full required minimum distribution before converting any additional IRA funds — RMD amounts are not eligible for conversion. You can convert funds above and beyond your RMD in the same year, though the total income must be carefully managed across brackets.
Is a Roth conversion right for everyone with a large IRA?
Not necessarily. Retirees who expect their income to decrease significantly, those with serious health conditions that may shorten their planning horizon, or those in very high tax brackets today with expected lower brackets in the future may find limited benefit. A qualified financial planning professional should model your specific multi-decade scenario before recommending a conversion strategy.
How does the SECURE Act affect the value of Roth conversions for estate planning?
The SECURE Act’s 10-year rule for inherited IRAs dramatically increased the estate planning value of Roth conversions. Because inherited Roth IRA distributions are income-tax-free, a Roth conversion executed during your lifetime effectively transfers wealth to heirs without the compounded tax burden that a traditional IRA now carries under the forced 10-year distribution timeline.
Why HNW Retirees Need Different Roth Conversion Advice Than Mass-Market Investors
Mass-market retirement planning tools and robo-advisors are built for simplicity. They model a single bracket, ignore IRMAA, don’t account for multi-generational tax impact, and treat a Roth conversion as a binary yes/no decision rather than a multi-variable optimization problem.
For a retiree with $1M–$5M in assets, that simplification costs real money. We’re talking about decisions that affect six or seven figures of lifetime wealth — the difference between a 24% conversion and a 35% forced RMD distribution, multiplied over 20+ years of retirement and passed on to an heir who inherits the outcome of your choices.
The families we work with at Davies Wealth Management have typically outgrown the planning their wirehouse broker or national firm can provide. They need a fiduciary — someone legally obligated to act in their interest — who builds the full multi-year model, accounts for every income interaction, and revisits the strategy every year as circumstances evolve.
If you’re in the $1M–$5M range and your current advisor hasn’t shown you a comprehensive Roth conversion analysis this year, that conversation is overdue.
Take Your Next Step
Understanding the math behind a Roth conversion is the first step — executing it correctly requires coordination across tax planning, Medicare strategy, estate planning, and investment management. The window for 2026 is open now, but it won’t remain so indefinitely.
📥 Download our Medicare IRMAA Planning Guide to see exactly how Roth conversion income interacts with your Medicare premiums and what thresholds to protect in 2026 and beyond.
Download the Medicare IRMAA Planning Guide →
📞 Ready for personalized guidance from a fee-based fiduciary? Book a complimentary phone call with our team to discuss your specific Roth conversion opportunity.
Book Your Complimentary Phone Call →
This content is for educational purposes only and does not constitute investment advice. Past performance is not indicative of future results. Advisory services offered through Davies Wealth Management, a Registered Investment Adviser. Please consult a qualified financial, tax, or legal professional regarding your specific situation.
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**Summary of links added:**
1. **Investment link** — Added to “investment” in the phrase “Social Security, pension, and investment income” in the bracket management section — the first natural occurrence of the keyword outside a heading or existing link.
2. **Retirement planning link** — Added to “retirement planning” in the IRMAA look-back section (“one of the most technically demanding aspects of HNW retirement planning”) — the first natural occurrence of the keyword phrase.
3. **Financial planning link** — Added to “financial planning” in the FAQ section (“A qualified financial planning professional should model your specific multi-decade scenario”) — the first natural occurrence of the keyword phrase outside a heading.
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