Inherited 401(k) Distributions Can Trigger $110,000 in Federal Taxes and Medicare Surcharges
HM
Hugo Montgomery
401k contribution limit · Apr 12, 2026
A beneficiary inheriting a $500,000 traditional 401(k) who withdraws $50,000 per year for a decade generates approximately $11,000 in federal tax annually at a 22% marginal rate. This $50,000 annual distribution can push a beneficiary into a 24% federal tax bracket. For retirees, combined income exceeding $34,000 for single filers or $44,000 for married couples can cause up to 85% of the Social Security benefits to become taxable.
These taxes are the result of the SECURE Act, which eliminated the stretch inherited 401(k) for most non-spouse beneficiaries. Most non-spouse beneficiaries must now distribute the entire balance within the 10-year window.
Beyond income tax, distributions can trigger Medicare premium surcharges known as IRMAA. Modified adjusted gross income exceeding $109,000 for single filers or $218,000 for married couples triggers the first IRMAA tier. Modified adjusted gross income exceeding $137,000 for single filers or $274,000 for married couples triggers the second tier. A married couple in the second IRMAA tier faces nearly $5,000 in annual surcharges.
At a 22% rate, the total federal tax liability over 10 years for a $500,000 inheritance is approximately $110,000.
401k contribution limitRoth IRA rule changecrypto IRS ruling
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