A $1.2M 401(k) produces a first-year RMD of roughly $45,283 at age 73, which counts as ordinary income and can trigger Medicare IRMAA surcharges (Tier 1 adds $1,148/year starting at $109,000 MAGI; Tier 2 surcharge is $2,886). Two practical avoidance strategies: (1) systematic Roth conversions before RMD age—pay tax now (potentially staying in the 22% bracket) but eliminate lifetime RMDs and (2) use the still‑employed exception if ownership is 5% or less and roll prior‑employer 401(k)s into the current plan to delay all RMDs until retirement. Key implementation risks include the two‑year IRMAA lookback, plan‑document restrictions, ownership percentage tests, and the permanent nature of conversions versus deferral.
The mechanical choices available to business owners create a bifurcated market opportunity: plan administrators and recordkeepers that make roll-ins frictionless and document-friendly will capture recurring AUM migration, while advisors who can price multi-year tax/healthcare sequencing will win disproportionate advisory fees. Expect a winner-take-most dynamic among large custodians with flexible plan documents and integrated tax tools; smaller recordkeepers and legacy TPAs that require manual sign-offs are at risk of losing sticky balances to competitors. There is a latent timing risk embedded in these strategies: taxable events today can produce a persistent cashflow drag via delayed means‑tested premium calculations and other benefit phase-ins. That mismatch creates both a behavioral arbitrage (clients willing to smooth conversions to avoid premium cliffs) and a regulatory tail risk (legislative pressure to change lookback windows or conversion-tax treatment if revenue impacts on entitlements become politically salient). From a product standpoint, firms that bundle ERISA-grade Roth 401(k) administration, in-plan Roth conversion plumbing, and real-time MAGI modelling will see outsized revenue per client. Conversely, industry players whose business models rely on rollouts of small, closed former-employer plans will see AUM attrition and margin pressure if consolidation into a single current plan becomes standard practice. The consensus that Roth conversions are a binary “do” decision misses the optimization value of cadence — staging conversions to exploit low-tax years while avoiding repeated premium tier creep is the operational alpha most advisors can sell for a fee.
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