Filing for Social Security automatically triggers Medicare Part A with up to 6 months of retroactive coverage, instantly converting active HSA contributions into penalized excess. The IRS charges a 6% excise tax on excess HSA contributions every year they remain in the account, compounding the penalty until fully withdrawn. HSA savers must stop all contributions, both personal and from employers, at least 6 months before applying for Social Security or Medicare to avoid the trap.
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It rarely creates trouble on its own. The trap opens the moment a worker files for Social Security. That single application triggers automatic enrollment in Medicare Part A, with coverage retroactive to the application date.
For anyone still contributing to an HSA, those retroactive months are when the IRS penalty grows. Under federal rules, Part A coverage can begin up to 6 months before the month a person signs up for or applies for Social Security benefits, though it never predates the month they first became eligible at age 65. That rule applies automatically.
There is no waiver, no opt-out provision, and no way to accept Social Security while refusing the retroactive Part A that comes with it. The mechanics matter because most workers over 65 deliberately delay enrolling in Medicare. They stay on an employer plan, keep the HSA active, and assume that claiming Social Security later is a separate decision.
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