“For the majority of US retirees holding retirement savings under $2 million, Roth conversions often lead to unnecessary tax burdens, higher healthcare costs, and diminished financial flexibility, outweighing potential long-term benefits due to factors like current tax brackets, Medicare surcharges, and limited growth horizons.”
Tax Bracket Implications
Roth conversions involve shifting funds from traditional IRAs or 401(k)s to Roth accounts, triggering immediate federal income taxes on the converted amount. This added income can push retirees into higher marginal tax brackets, resulting in a larger tax bill than anticipated. With average retirement savings hovering around $289,000 for typical households, many retirees operate in lower brackets during their distribution phase, making the upfront tax payment counterproductive.
Consider a single retiree with $300,000 in a traditional IRA planning a $50,000 conversion. This could elevate their taxable income from the 12% bracket into the 22% range, increasing the effective tax rate on the conversion. Married couples filing jointly face similar risks; a conversion might shift them from the 12% bracket (up to $100,800) to 22% (over $100,800), amplifying the cost without proportional future savings.
The current federal income tax structure exacerbates this for modest portfolios. Here’s a breakdown of the 2026 brackets for reference:
| Filing Status | 10% Bracket | 12% Bracket | 22% Bracket | 24% Bracket | 32% Bracket | 35% Bracket | 37% Bracket |
|---|---|---|---|---|---|---|---|
| Single | $0 – $12,400 | $12,401 – $50,400 | $50,401 – $105,700 | $105,701 – $201,775 | $201,776 – $256,150 | $256,151 – $609,350 | Over $609,350 |
| Married Filing Jointly | $0 – $24,800 | $24,801 – $100,800 | $100,801 – $211,400 | $211,401 – $403,550 | $403,551 – $512,300 | $512,301 – $731,200 | Over $731,200 |
For retirees with less than $2 million, conversions rarely justify the bracket bump, especially if withdrawals in later years remain in the 10% or 12% zones. State taxes add another layer; in states like California or New York with high income taxes, the combined federal and state hit could exceed 30%, eroding a significant portion of the converted funds immediately.
Impact on Medicare Premiums Through IRMAA
One overlooked downside is the effect on Medicare costs via Income-Related Monthly Adjustment Amounts (IRMAA). These surcharges apply to Part B and Part D premiums based on modified adjusted gross income (MAGI) from two years prior. A Roth conversion inflates MAGI, potentially triggering IRMAA for multiple years.
For 2026, IRMAA thresholds start at $107,000 for singles ($214,000 for joint filers), with surcharges scaling up. A $100,000 conversion could push a retiree over the first threshold, adding $81.20 monthly to Part B premiums (nearly $1,000 annually) plus Part D extras ranging from $14.50 to $91 monthly. Over five years, this could total $10,000 or more in avoidable costs.
Retirees with sub-$2 million nests often rely heavily on Medicare, and IRMAA can consume 5-10% of modest withdrawals. Data shows median savings for those 65-74 at around $200,000, leaving little buffer for such hikes. Avoiding conversions preserves lower premiums, safeguarding healthcare affordability.
Here’s the 2026 IRMAA surcharge table for Part B (added to the standard $202.90 monthly premium):
| MAGI (Single) | MAGI (Joint) | Monthly Surcharge |
|---|---|---|
| $107,001 – $134,000 | $214,001 – $268,000 | $81.20 |
| $134,001 – $165,000 | $268,001 – $330,000 | $203.00 |
| $165,001 – $208,000 | $330,001 – $416,000 | $324.80 |
| $208,001 – $262,000 | $416,001 – $524,000 | $446.60 |
| $262,001 – $420,000 | $524,001 – $840,000 | $487.00 |
| Over $420,000 | Over $840,000 | $487.00 (plus higher tiers if applicable) |
For Part D, surcharges mirror this structure but at lower amounts, still compounding the financial strain for those with limited assets.
Social Security Taxation Considerations
Roth conversions can inadvertently increase the taxable portion of Social Security benefits. Up to 85% of benefits become taxable if provisional income (AGI plus half of benefits plus tax-exempt interest) exceeds certain thresholds: $25,000-$34,000 for singles (50% taxable) or over $34,000 (85% taxable); $32,000-$44,000 for joint filers (50%) or over $44,000 (85%).
With average annual Social Security benefits around $22,000 per individual, a conversion easily tips provisional income over these unadjusted limits. For a couple receiving $40,000 combined benefits, a $30,000 conversion might make 85% taxable, adding $3,000-$5,000 in unexpected taxes. Retirees under $2 million often depend on Social Security for 40-60% of income, so this erosion directly impacts living standards.
Preserving traditional accounts allows for strategic withdrawals that minimize this taxation, such as timing distributions to stay under thresholds. Conversions eliminate this flexibility, locking in higher lifetime taxes for those without substantial buffers.
Opportunity Cost and Liquidity Concerns
The cash required to pay conversion taxes represents a major opportunity cost. Retirees must either use non-retirement funds or withhold from the conversion, reducing the Roth’s growth potential. With median 401(k) balances for those in their 60s at $189,000, dipping into savings for taxes means forgoing compound returns elsewhere.
Assume a 7% annual return: Paying $10,000 in taxes today for a $50,000 conversion (at 20% effective rate) means missing out on $20,000 in growth over 10 years. For portfolios under $2 million, this loss compounds, as the tax payment could instead cover essentials like home repairs or healthcare gaps.
Liquidity is another issue. Markets fluctuate, and tying up funds in taxes leaves less for emergencies. Recent volatility in bonds and equities underscores this; retirees with modest holdings can’t afford to deplete cash reserves, especially with inflation eroding purchasing power at 2-3% annually.
Breakeven Analysis and Longevity Risks
Roth conversions shine when tax-free growth outpaces the initial tax hit, but breakeven typically requires 10-20 years of compounding. For retirees starting conversions at 65-70 with under $2 million, this timeline often exceeds life expectancy (average around 18-20 years post-retirement).
Calculations show: A $100,000 conversion at 22% tax costs $22,000 upfront. To breakeven at 6% growth and future 12% withdrawal tax, it takes 15 years. If the retiree passes earlier, heirs inherit a taxed-down asset without full benefits. With average savings at $289,000, only a fraction can be converted annually without bracket jumps, prolonging the process.
Health uncertainties amplify this; chronic conditions shorten horizons, making conversions a gamble. Data indicates 40% of retirees believe $824,000 is needed for comfort, yet most fall short, prioritizing preservation over speculative growth.
Estate Planning Drawbacks
For heirs, Roth accounts offer tax-free inheritance, but with smaller estates under $2 million, traditional IRAs may be preferable if beneficiaries are in lower brackets. The SECURE Act requires non-spouse heirs to withdraw over 10 years, spreading taxes.
A conversion shifts the tax burden to the retiree, potentially at higher rates. If heirs earn modestly, they pay less on inherited traditional funds. Blended families or charitable intents further complicate; Roths lock in decisions, reducing adaptability.
Alternatives to Roth Conversions
Instead of conversions, retirees can employ Roth contributions if eligible (income limits apply), or use QCDs (Qualified Charitable Distributions) from traditional IRAs to reduce RMDs tax-free. Partial conversions in low-income years (e.g., before Social Security starts) might work for some, but for most under $2 million, maintaining traditional accounts with careful withdrawal sequencing—prioritizing taxable, then tax-deferred, then tax-free—maximizes efficiency.
Laddering bonds or annuities provides income without conversion risks, while health savings accounts offer triple tax advantages for medical expenses. Consulting tax software for projections reveals that skipping conversions often nets 10-15% more spendable income over retirement.
Disclaimer: This article is for informational purposes only and does not constitute financial, tax, or legal advice. Readers should consult qualified professionals for personalized guidance based on their individual circumstances.