What Happens to a $900,000 401(k) When the Owner Dies and the Beneficiary Falls Under the New 10 Year Rule Quick Read – Inherited $900,000 401(k) generates $1.6M taxable income over 10 years; 41% combined marginal rate yields $375K-$450K tax bill. – Build year-by-year…
stribution schedule targeting 24% bracket and IRMAA thresholds to reduce cumulative tax burden significantly. – A 65 year old who just inherited a $900,000 401(k) from a parent who died at age 75 is staring at a tax bill most beneficiaries never see coming. The stretch IRA, the planning move that let prior generations spread inherited account withdrawals across their own life expectancy, is gone for non spouse heirs
In its place sits the SECURE Act 10 year rule, effective for deaths after 2019, and a set of final IRS regulations published in July 2024 that quietly made the math worse. Because the parent died after reaching the required beginning date for RMDs, the heir does not get to wait until year 10 and pull everything at once. The final regulations confirm that annual RMDs are mandatory during years one through nine, with the full remaining balance due by December 31 of year 10.
The IRS waived enforcement of those annual RMDs from 2021 through 2024 while the rules were being finalized, but annual RMDs from inherited accounts are now in force starting 2025. The Tax Bomb in Plain Dollars Assume the inherited 401(k) earns a 6% blended return inside the account. By year 10, the cumulative distributions plus residual balance approach roughly $1.6 million of taxable income spread across the decade.