Under 1989.100(a), what activities are protected by the Taxpayer First Act (TFA) retaliation rules?
The TFA retaliation rules protect employees who engage in activity related to underpayment of tax or who reasonably believe they have observed violations of the internal revenue laws or other Federal laws relating to tax fraud. See 1989.100(a) which explains that protection covers activity "pertaining to underpayment of tax or any conduct which the employee reasonably believes constitutes a violation of the internal revenue laws or any provision of Federal law relating to tax fraud."