Which account to drain first? The order matters — sometimes by hundreds of thousands over a 30-year retirement.
Simplified 60-year simulation. Does NOT model: RMDs forcing tax-deferred withdrawals at age 73, capital-gains rates vs. ordinary rates on the taxable account, IRMAA tier crossings during big tax-deferred withdrawals, or year-by-year tax-bracket optimization. The default sequence is a useful starting rule; the optimal sequence is highly personal and often involves strategic Roth conversions in low-income years (early retirement before SS claiming).