Plan year
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
The Thrift Savings Plan's plan year is established on a calendar-year basis for all purposes, except where another applicable provision of law requires that a fiscal year or other basis be used. As used in this section, the term “calendar-year basis” means a twelve-month period beginning on January 1 and ending on December 31 of the same year.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.