How do I manage my MAGI to qualify for ACA health-insurance subsidies in early retirement?

ACA premium subsidies are based on your modified adjusted gross income (MAGI), so early retirees can often qualify for large subsidies by keeping reportable income low — even with a big portfolio. Because much of your spending may come from taxable-account sales (where only the gain counts) and from Roth or cash buffers (which don't count toward MAGI), you have real control over the number the marketplace sees. Many FIRE households deliberately limit Roth conversions and capital-gains realization in a given year to stay under subsidy cliffs. The tradeoff is direct: every extra dollar of conversion or harvested gain can shrink your subsidy, so coordinate your drawdown order with your target MAGI. Keep an eye on Medicaid-eligibility floors too, since dropping income too low can shift you off marketplace plans. Map your taxable income plan year by year before enrolling.