One of the world's largest companies has cheated on its taxes to the tune of more than $2 billion, according to papers filed with the IRS Whistleblower Office by a Washington D.C. law firm.

The submission, on behalf of a tax whistleblower, is the largest ever according to lawyers for the firm.  The next largest submission was made earlier this year for a sum of about $1 billion.

"We have been keeping our eye on the tax exposure disclosures that publicly held companies have been making for the first time this year under FIN 48 and Sarbanes-Oxley, so we know that there are many more billion dollar issues out there," said a tax partner with the D.C. law firm.

The firm did not publicly name the accused company in its news release announcing the filing.