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... Former U.S. Rep. Billy Long of Missouri, whom President-elect Donald Trump has named his nominee to head the IRS, touts his expertise in tax matters.

He advertises his credential as a certified tax and business advisor, and he adds CTBA to his name on his X profile. That profile encourages people to message him to "save 40% on your taxes."

But tax experts told ProPublica that they have never heard of CTBA as a credential in the tax profession.

The designation is offered by a small Florida firm, Excel Empire, which was established just two years ago and only requires attendance at a three-day seminar.

That is in stark contrast to the 150 credit hours and the rigorous exams required to become a certified public accountant, a standard certification for tax accountants. ...