Nearly all successful whistleblowers seeking large awards, and many seeking smaller ones, use specialized tax attorneys to prepare their submissions. Their fee is typically 25% to 40% of an award. The attorneys say the package for the IRS needs to include items such as account statements, internal memorandums, emails and perhaps even voice recordings.
Yes, voice recordings. One whistleblower had to wear a wire to get incriminating information—twice, because the device malfunctioned once. She and another person collected an award of nearly $18 million for submitting evidence that led a Swiss bank to plead guilty to encouraging U.S. tax evasion and pay $74 million.
— Read on www.google.com/amp/s/www.wsj.com/amp/articles/the-profitable-prospects-of-snitching-for-the-irs-11556271006