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@rbynaker wrote:

A quick Google search hit this site:

https://militarybenefits.info/military-spouse-act-residency-relief-msrra/

which says "The spouse does not inherit the domicile of the servicemember upon marriage"

Check your original assertions, I'm not sure they are correct.

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The site is correct in making that statement.  50 U.S. Code § 4001(a)(2)(B) refers only to "residence", not domicile.  This would mean the spouse will still be on the hook for excise tax and whatever else that is tied to domicile, until and unless a new domicile is established in fact.