Summary: This case study follows "Susan" and "Mark" (anonymized), a married couple who retired from public-sector and private-sector careers in their early 60s. By deferring a defined-benefit pension, working part-time for three years, and executing a planned series of Roth conversions while staggering Social Security filings, they reduced future required minimum distributions (RMDs), cut lifetime federal income taxes, and preserved flexibility for healthcare and legacy goals. The result: higher tax-free income later and a smaller taxable RMD burden in their 70s.

Background: assets, income and choices

Susan (former school principal) and Mark (engineer) retired in 2022 at ages 62 and 64. Their baseline financial position:

  • Pre-tax retirement accounts (401(k) + traditional IRA): $720,000
  • Roth accounts: $40,000
  • Taxable brokerage: $160,000
  • Defined-benefit pension (Susan): projected $28,000/year at age 65; available to begin at 62 with actuarial reduction
  • Projected combined Social Security at full retirement: $36,000/year
  • Annual part-time wages (post-retirement): planned $18,000–$25,000 for 3 years

The couple’s priorities were: 1) limit lifetime taxes, 2) reduce taxable RMD exposure in their 70s, 3) keep options open for Medicare and long-term care, and 4) leave a modest legacy.

The strategy in plain terms

Susan and Mark pursued four coordinated moves:

  1. Defer Susan’s pension start date until age 65 to avoid a reduced early benefit and to create a multi-year low-tax window.
  2. Work part-time for three years (2023–2025) to generate modest wages and healthcare coverage while keeping taxable income low enough to perform Roth conversions without jumping into high tax brackets.
  3. Execute staged Roth conversions from the traditional IRA/401(k) to a Roth IRA over 2023–2025, converting roughly $35,000–$55,000 per year—amounts chosen to fill lower tax brackets and avoid increased taxation of Social Security benefits.
  4. Stagger Social Security filing so Mark delayed his primary benefit to 70 for a higher payout, while Susan took a reduced spousal benefit at 66 and converted more aggressively while her provisional income remained low.

Why this combination worked

Each element reinforced the others.

  • By deferring the pension start and keeping earned income modest, they created years with relatively low taxable income—an ideal window to convert pre-tax retirement savings to a Roth IRA at favorable marginal rates.
  • Roth conversions are taxable in the year of conversion but remove assets from the future RMD base. Because Roth IRAs are not subject to required minimum distributions for the original owner, converting reduced the couple’s RMDs in their 70s and 80s.
  • Delaying Mark’s Social Security until 70 increased his future benefit and reduced the chance that earlier conversions would push them into higher provisional income ranges that increase taxation of Social Security benefits.

Execution timeline and numbers (illustrative)

Below is the couple’s approximate timeline and conversions. Figures are illustrative and rounded.

  • 2022 (Retirement year): Mark and Susan retire. Susan elects to defer her pension until 65 rather than taking reduced payments at 62.
  • 2023–2025 (Part-time work + conversions):
    • Part-time wages: $20,000/year (healthcare covered through employer for first two years).
    • Roth conversions: $50,000 (2023), $45,000 (2024), $40,000 (2025) from their traditional IRA/401(k) into a Roth IRA—total converted: $135,000.
    • Taxes paid on conversions came primarily from the taxable brokerage account to avoid further draining retirement assets.
  • 2026 and beyond: Susan’s pension kicks in at 65 with full value; Mark files for Social Security at 70; by age 73, their RMDs from remaining traditional balances are substantially lower because a large portion has been moved to Roth.

Outcomes

Within five years the couple achieved measurable results:

  • Converted $135,000 to Roth, shrinking the pre-tax account balance that will be subject to future RMDs by roughly 19% (from $720k pre-conversion).
  • Paid conversion taxes at lower marginal rates, avoiding higher brackets they would have faced if conversions had been delayed until pension + Social Security started.
  • Reduced projected taxable RMDs in their 70s by an estimated $6,500–$9,000/year (illustrative), improving tax brackets for other income.
  • Increased lifetime Social Security benefits by delaying Mark’s claim, offsetting some costs of upfront taxes paid on conversions.
  • Retained flexibility: Roth assets now provide a source of tax-free distributions for discretionary spending or to manage taxation in high-medical-cost years.

Lessons for retirement planning enthusiasts

This couple’s case highlights several transferable lessons:

  1. Identify low-tax windows: Early-retirement years where earned income is low—and before pension and Social Security increase taxable income—are prime times for Roth conversions.
  2. Coordinate pension timing with conversions: If your pension allows deferral without severe actuarial penalties, deferring can create conversion space. But evaluate lost benefits: sometimes a modest early increase beats conversions—run the math.
  3. Use taxable accounts to pay conversion taxes: Paying conversion taxes from non-retirement funds avoids shrinking retirement balances and preserves the compounding benefit of converted Roth assets.
  4. Think beyond immediate tax savings: Reducing future RMDs can improve long-term tax efficiency and reduce Medicare IRMAA exposure for high-income retirees (monitor IRMAA thresholds with a planner).
  5. Stagger Social Security decisions: Splitting claiming strategies between spouses (one delays, one claims earlier) can balance lifetime income and maximize survivorship benefits.

Warnings and caveats

What worked here may not be right for everyone:

  • Roth conversions are taxed in the conversion year. If conversions push you into higher brackets, the immediate tax cost may outweigh future benefits.
  • Not all pensions allow cost-effective deferral—some include penalties or reduced survivor options. Verify plan rules and run scenario analyses.
  • Medicare, IRMAA, state taxes, and possible changes in federal tax law can alter the math. The couple monitored these elements annually with a certified financial planner and tax advisor.
  • This was an intentional, multi-year plan. Attempting one large conversion in a single year can trigger unwanted tax consequences.

Action checklist

For readers considering a similar approach:

  1. Map all retirement income sources (401(k), IRA, Roth IRA, pension, Social Security) and projected ages of commencement.
  2. Model taxable income scenarios for early-retirement years and after pension/Social Security start.
  3. Identify a multi-year conversion schedule that keeps you within desired tax brackets.
  4. Decide how to pay conversion taxes (taxable account vs. IRA withholding) and estimate Medicare/IRMAA impacts.
  5. Run sensitivity tests—what if markets fall, or you need to start the pension earlier?
  6. Consult a tax professional and financial planner familiar with Roth conversions, required minimum distribution rules, and pension specifics.

Conclusion

Susan and Mark’s coordinated strategy—deferring a pension, keeping income intentionally low for a few years, staging Roth conversions, and staggering Social Security—converted a narrow timing window into long-term tax and flexibility gains. They paid taxes earlier in exchange for smaller taxable RMDs, higher tax-free income later, and an improved ability to manage healthcare and legacy goals.

That trade-off—pay now to save later—is not universally optimal, but it is a powerful option to evaluate. For retirement-planning enthusiasts, the takeaway is clear: timing matters. Combining pension rules, 401(k)/IRA balances, Roth conversions, and Social Security claiming into a coherent, multi-year plan can materially affect lifetime taxes and retirement security.