Bracket creep
Do you know what your marginal bracket looks like at 82?
RMDs grow every year, not because your portfolio does, but because the IRS divisor shrinks as you age. Most high-balance retirees end up in a higher bracket in their 80s than the year they retired. That extra income also decides how much of your Social Security gets taxed and whether you pay Medicare IRMAA surcharges on top.