Spending is funded in a deliberate sequence across Roth 401(k), HSA, traditional 401(k), and Social Security. Roth 401(k) withdrawals provide $80,000 with zero federal tax and no effect on AGI, Medicare premium calculations, or Social Security taxability. HSA withdrawals of $40,000 for qualified medical expenses are tax free in and tax free out, including Medicare Part B and Part D premiums after enrollment. Traditional 401(k) withdrawals of $50,000 create ordinary income. Social Security of $24,000 is partially taxable, with up to 85% inclusion. Only the traditional 401(k) and taxable Social Security portions are taxed. With deductions stacking after both spouses reach 65, taxable income falls enough to keep capital gains in the 0% bracket.
"$80,000 from the Roth 401(k): zero federal tax, zero impact on AGI, zero effect on Medicare premiums or Social Security taxability. $40,000 from the HSA, spent on qualified medical expenses (Medicare Part B and Part D premiums count once enrolled): tax free in, tax free out. $50,000 from the traditional 401(k): ordinary income. $24,000 in Social Security claimed at 62, reduced from a $30,000 primary insurance amount at 67. Up to 85% is taxable."
"Only the bottom two are taxed. The Roth and HSA dollars are invisible to AGI, to the IRMAA lookback, and to the Social Security inclusion formula. That invisibility is the entire trick."
"Taxable income runs roughly $50,000 from the traditional 401(k) plus $20,400 from the taxable portion of Social Security, or about $70,400. Once both spouses are 65, deductions stack fast: the 2026 standard deduction for married filing jointly of about $32,200, plus the senior add-on of $1,650 per qualifying spouse, plus the new senior bonus deduction worth up to $6,000 per spouse. That bonus phases out at 6% per dollar of MAGI above $150,000 MFJ, so at this AGI the full $12,000 applies."
"Total deductions land near $47,500. Taxable income drops to roughl"
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