Retirement planning is often a long game of managing when assets convert from “potential tax” (traditional 401k/IRA) into taxable income. In this case study — based on an anonymized married couple who retired in 2025 — we examine a specific, implementable sequence of moves that materially reduced their required minimum distributions (RMDs) and federal tax bills in their early 70s, while preserving flexibility around social security and Medicare exposure.

Background: the household and the problem

“John” (born 1959) and “Maya” (born 1961) retired in late 2025 after careers in public- and private-sector healthcare. Key facts at retirement:

  • Traditional IRA balance: $900,000
  • 401(k) at former employer: $150,000 (no longer contributed to)
  • Roth IRA: $60,000
  • Taxable brokerage: $250,000 (mix of stocks and bonds)
  • Pension: lifetime $1,800/month (joint-and-survivor) from John’s employer
  • Social Security: both deferred (Maya planning to claim at 67; John considering waiting to 70)

Their planner identified two main risks: rising RMDs when required distributions begin in their early-to-mid 70s under current law and the knock-on effects of higher taxable income — notably increased Medicare IRMAA surcharges and higher tax on Social Security benefits. Their goals were to reduce future RMD-driven taxable income, preserve liquidity for living expenses while delaying John’s Social Security to 70, and retain charitable flexibility.

Strategy implemented (2026–2029)

The plan combined four elements implemented over a three-year window (2026–2028):

  1. Targeted Roth conversions in lower-income years. John and Maya converted $150,000 of traditional IRA funds to Roth IRA in three roughly equal chunks across 2026–2028. Conversions were sized to fill low-to-mid tax brackets without pushing their MAGI into IRMAA-triggering territory.
  2. Use taxable brokerage to fund living expenses while deferring Social Security. The couple drew primarily from their taxable brokerage account from retirement through age 70, preserving retirement-plan balances and avoiding early large RMDs.
  3. Qualified charitable distributions (QCDs) once age-eligible. At age 70½ and later, when the charity plan was appropriate, they used QCDs from IRA funds to satisfy charitable gifting goals without increasing taxable income.
  4. Pension payout election reviewed and timed. John’s pension offered a small increase for later start dates; his planner elected to maintain the joint survivor option but phased some small internal life-insurance/beneficiary tweaks to keep the household guaranteed income intact and avoid a sudden taxable spike in the pre-RMD period.

Why this mix?

Each element addresses a different driver of taxable RMD pain. Roth conversions remove taxable balances from the traditional IRA bucket (reducing future RMDs). Using taxable assets for near-term cash needs avoids creating artificial high-income years that would have occurred if they had pulled heavily from the IRA. QCDs give tax-efficient charitable giving once age-qualified. Pension timing preserves guaranteed baseline income so they could safely defer John’s Social Security to 70, increasing long-term guaranteed retirement income and reducing Social Security’s early claiming tax drag.

Numbers and outcomes

Here are the concrete, verifiable effects as modeled by the couple’s planner using conservative return assumptions (4% nominal growth) and current IRS life-expectancy divisors:

  • Traditional IRA balance after the $150,000 conversions (and modest investment gains) fell to roughly $760,000 by end of 2028.
  • Projected RMD at age 73 (first required year under their cohort) fell from a baseline projection of about $34,000 to roughly $28,500 — a decline of ~16%.
  • Because the Roth conversions were executed in low-tax years and sized to avoid pushing the couple into higher tax brackets or causing IRMAA increases, the planners estimate the couple’s federal income tax in the first three RMD years will be approximately $24,000 lower than under a "do-nothing" baseline where all retirement assets remained traditional.
  • Because John delayed claiming Social Security to 70, the couple’s guaranteed income rose, making them less dependent on taxable withdrawals at claim ages and further smoothing taxable income into later years when tax rates and IRMAA exposure matter less.

Those estimates come from an individualized cash-flow model the couple’s advisor runs; actual results will vary with returns, future tax-law changes and health/long-term-care needs. The key takeaway is directional clarity: a modest upfront tax cost (conversions taxed when executed) produced a predictable reduction in future taxable RMDs and lowered IRMAA and Social Security taxation exposure.

Operational details and tax safeguards

Three operational details made the plan work and are applicable to readers considering something similar:

  • Size conversions to bracket "gaps." The planner mapped current tax brackets and IRMAA thresholds and sized each conversion to fill, but not exceed, the couple’s preferred marginal tax rate. That avoided accidental push into higher rates or IRMAA surcharges.
  • Coordinate timing with market volatility. Conversions were executed during windows of modest market declines in 2026 and 2027, which lowered the tax cost on conversions expressed as a percent of portfolio value (converting after market drops means fewer shares converted).
  • Preserve Roth basis for long-term estate and tax flexibility. Converted amounts were left in the Roth and not withdrawn for five years (required to avoid tax on earnings and to preserve future RMD-exemption advantages).

Lessons for retirement-planning enthusiasts

This couple’s case highlights several broadly applicable lessons:

  1. Don’t treat IRAs and 401(k)s as a single “bag.” Asset location matters. Moving some tax exposure from traditional IRAs to Roth IRAs reduces future RMD-driven taxable income.
  2. Use taxable accounts as a bridge — taxable brokerage can fund early retirement while preserving tax-advantaged balances for later years, enabling strategic conversions and Social Security optimization.
  3. Plan conversions with IRMAA and Social Security in mind. It’s not just federal income tax rates; Medicare surcharges and Social Security taxation can make a conversion look far worse if it pushes MAGI over a threshold.
  4. QCDs remain a potent, underused tool. For those with charitable intent, directing IRA dollars via QCDs reduces taxable income and can substitute for Roth conversions in some years.

Caveats and when this wouldn’t work

This strategy is not universal. It’s most appropriate when:

  • The household has taxable assets to draw from in the early retirement years.
  • There are expected years of relatively low taxable income during which conversions can be executed cheaply.
  • There’s a desire to reduce future RMDs and mitigate IRMAA/SS-tax exposure.

It’s less useful if a household needs IRA withdrawals immediately for spending, lacks taxable assets to act as a bridge, or faces immediate estate liquidity needs that favor preserving traditional IRA balances for heirs who may be in a lower tax bracket.

Bottom line

John and Maya’s program demonstrates a practical, timely path: modest, sequenced Roth conversions done in low-income years, combined with a taxable cash buffer and careful pension/Social Security timing, can materially reduce the RMD-driven tax burden in the early 70s. For retirement-planning enthusiasts, the case underlines that strategic sequencing—rather than a single, dramatic move—often delivers the best balance of tax savings, flexibility and retirement security.