Every tax rule has a family tree. Pick a rule and follow it back: the law that made it, the people who wrote it, and the problem they were trying to fix.
This site explains where tax rules came from. For your own situation, talk to a licensed tax professional such as a CPA or enrolled agent.
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Educational history only, not tax or legal advice. Federal rules only; states differ. Rules change, so check the linked sources and a tax professional before acting. Entries were researched in October 2026 from the linked sources. A tax professional hasn't reviewed them yet.