First, do you actually have an MSA? There are two types on the federal return: Archer MSAs and Medicare Advantage MSAs.
I ask because Archer MSAs are relatively rare and getting rarer because t...
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First, do you actually have an MSA? There are two types on the federal return: Archer MSAs and Medicare Advantage MSAs.
I ask because Archer MSAs are relatively rare and getting rarer because they are being supplanted by HSAs, which are better than the original Archer MSA. And the Medicare Advantage MSA is used only by Medicare and not by taxpayers. I assume that on your W-2 you have a code R with a dollar amount in box 12? This refers to contributions to your MSA.
OK, let's say that you have an MSA. There is an annual MSA contribution limit, which varies on a number of things. You can read about it starting on page 11 in IRS Pub 969.
If you exceed that limit, you have some options, one of which is withdrawing the excess. Generally, the simplest thing to do is to just withdraw the excess BEFORE the original due date of your return (April 15, 2026). To withdraw the excess, you must contact your MSA custodian and ask for the "withdrawal of excess contributions". They will send you a check for that amount plus any interest earned while your excess was in the MSA. Note that there may be a form on the custodian's website to do this request online.
You can read about excess contributions for an MSA on the lower right of page 12 in the Pub 969 link above.