Social Security claiming and Medicare timing
Social Security benefits can be claimed as early as 62, at a permanently reduced monthly amount, at full retirement age (66 to 67, depending on birth year) for the unreduced base benefit, or as late as 70, when delayed retirement credits increase the monthly benefit further; the right choice depends on health, other income sources, and marital status, since spousal and survivor benefit rules add another layer of coordination between two spouses' claiming decisions. Medicare eligibility generally begins at 65, and missing the initial enrollment window can trigger permanent late-enrollment penalties, which makes the timing around 65 worth planning even for those still working past that age with employer coverage. Income-related monthly adjustment amounts (IRMAA) mean Medicare Part B and Part D premiums rise at higher income levels, based on tax returns from two years prior—one reason a large one-time income spike, like a big Roth conversion or capital gain, in the years leading up to Medicare eligibility deserves attention to its ripple effects on premiums, not just its immediate tax cost.