The biennial balloon has descended, and those wishing to clamber aboard on November 17 can read all about it.
Here’s the skinny: https://www.ustaxcourt.gov/resources/forms/Admission_Nonattorney_Info_and_Form_18A.pdf
Note the fees. It isn’t cheap, and the pass rate is way less than any Bar exam I know of.
Anyway, it’s open season for applications. So study hard. Time management and knowing the FRE cold are the keys.
Best of luck to the candidates.