For retirement planners in 2026, two structural developments have reshaped the calculus around Roth conversions: materially higher short- and intermediate-term yields since 2022, and the post‑SECURE 2.0 landscape for required minimum distributions (RMDs). Combine those with the perennial levers—when to claim Social Security and how pensions and 401(k)/IRA balances interact—and the result is a narrower, more tactical set of "conversion windows" that can meaningfully reduce lifetime tax bills and RMD exposure.

Why 2022–26 matters: yields, RMD timing and the tax opportunity

Interest rates and Treasury yields rose sharply beginning in 2022, and while they have fluctuated since, the broader shift away from ultra‑low yields persists. For retirees that matters because cash and short-duration fixed income now produce attractive, low-volatility returns that can be held inside a Roth after conversion without sacrificing yield—reducing market and sequence-of-returns risk on converted dollars.

At the same time, SECURE 2.0—implemented beginning in 2023—moved the RMD starting age to 73 (and schedules an increase to 75 by 2033). That change creates a longer pre‑RMD window for many retirees to perform Roth conversions without the complicating requirement of yearly RMDs that cannot be converted. Put simply: more time before mandatory distributions increases the flexibility to stagger conversions across multiple lower-income years.

Core mechanics to keep in mind

  • Roth conversion tax timing: converting a traditional 401(k) or IRA to a Roth IRA triggers ordinary income tax on the converted amount in the year of conversion.
  • RMD exclusion: once RMDs start for your account type, you must take the RMD amount for the year before attempting any conversion of funds that would otherwise satisfy that RMD; the RMD itself cannot be converted.
  • Pensions and Social Security: pension payouts and Social Security benefits increase your taxable income and may shrink the low‑tax windows available for conversions (they also affect Medicare IRMAA and Social Security taxation).
  • 401(k) plan rules: in‑plan Roth conversions are possible in some employer plans; rules and timing differ from IRA conversions, so coordinate rollovers carefully.

How rising yields change the trade-offs

Historically, Roth conversions were most attractive when expected future returns were high and bond yields low—because locking tax-free growth on high-growth equities had big payoff. The 2022–26 yield environment changes the math in two ways:

  1. Converted dollars can be parked in short-duration bonds or cash-equivalents that now yield materially more than a few percentage points. A retiree who converts and then places those dollars in a ladder earning, say, 4%–6% (hypothetical) gets an immediate, low-volatility return inside tax-free Roth space.
  2. Higher current yields compress the risk premium for holding equities inside a Roth, making partial conversions aimed at de‑risking (and reducing future RMDs) more attractive relative to staying fully invested in taxable-deferred accounts until later.

Illustrative scenario: partial conversion with laddering

Consider a 67‑year-old with $800,000 in traditional IRAs and a pension providing $20,000/year. Social Security is deferred to 70. If they perform a $80,000 Roth conversion in a low‑income year and then ladder the converted amount into short-term bonds yielding 4%, that $80,000 will generate roughly $3,200/year tax-free—without drawing on principal and reducing future RMD base. If instead they left the $80,000 in the IRA, at RMD age it will increase future taxable RMDs (and potentially push Social Security into a higher provisional income bracket).

Timing strategy by age cohort (practical guidance)

Ages 60–66: build conversion flexibility before claiming Social Security

This is often the prime window for conversions if you delay Social Security and have limited other taxable income. With Social Security deferred, taxable income can be low—even if you have a pension—allowing conversions up to the top of a preferred tax bracket without triggering accelerated taxation of benefits or Medicare surcharges.

Action steps:

  • Model multi-year conversion ladders that fill lower tax-bracket room before claiming Social Security.
  • Favor converting amounts you expect to hold in lower-volatility investments (bonds, cash) post-conversion if preserving principal is important.

Ages 67–72: balance conversions with impending RMDs

With RMDs not yet required for many (SECURE 2.0’s 73 threshold), this cohort should weigh conversions against the likelihood of hitting higher brackets once RMDs begin. If you’ve deferred Social Security, you may still have conversion room; if you’re collecting benefits, taxable income may already be elevated.

Action steps:

  • Prioritize conversions that reduce the IRA balance likely to be exposed to larger RMDs later—especially if interest yields allow you to earn similar income inside a Roth.
  • Coordinate with pensions: if pension payments are indexed or expected to increase, front‑load conversions now rather than later.

Ages 73+: RMD realities and limited conversion options

Once RMDs start, you cannot convert the annual RMD amount; you must withdraw it and pay taxes on it. Conversions are still possible for amounts above the RMD, but the window for impactful reduction of RMD base is smaller.

Action steps:

  • If you are near 73, plan conversions in the years immediately preceding RMD start to maximize ability to shrink future RMDs.
  • After RMDs begin, evaluate if the remaining IRA balance still merits incremental conversions, using years with unexpected low income (e.g., medical leave, one‑time losses) to opportunistically convert.

Social Security coordination: key interactions

Claim timing for Social Security materially affects conversion capacity. Collecting benefits increases provisional income and can push combined income into higher tax brackets, reducing or eliminating the low‑tax windows that make Roth conversions efficient. Conversely, delaying Social Security preserves a low‑income period that is ideal for conversions—if you have other cash available to pay the conversion tax.

Example trade-off: a retiree who delays Social Security to 70 can often convert more aggressively at 63–69, using the years without benefit income to lock in Roth tax-free growth. But that requires saving cash to pay conversion taxes without drawing on Social Security or to withhold from other accounts.

Practical checklist before executing conversions

  1. Run multi-year tax projections that include expected pension payouts, projected Social Security claiming age and the SECURE 2.0 RMD start date for your cohort.
  2. Estimate Medicare IRMAA and Social Security tax thresholds—conversions can affect these.
  3. Decide whether to convert inside an employer 401(k) (in-plan Roth) or by rolling to an IRA first—plan rules and timing vary.
  4. Allocate converted dollars to investments aligned with your goals: growth inside Roth for longer windows; short-duration bonds or cash for de-risking and steady tax-free income.
  5. Prepare cash to pay the conversion tax from outside the converted account to preserve the Roth principal growth benefit.

Bottom line: a tactical, data-driven approach

Roth conversions in 2026 should not be binary. The twin realities of higher yields and later RMDs under SECURE 2.0 create tactical windows where partial, staggered conversions can reduce future RMD tax exposure and lock low-volatility yield inside tax‑free Roth accounts. The optimal approach depends on your age, pension and Social Security timing, current taxable income, and willingness to pay conversion taxes now.

For most retirement planners, the actionable path is clear: model multiple scenarios, exploit low‑income years (often created by social security deferral or timing of pension start), and use the higher-yield fixed-income market to hold converted dollars in a conservative, tax‑free wrapper. That combination reduces sequence-of-returns risk, shrinks future RMDs and can lower lifetime taxes—if executed with discipline and tax-aware projections.