The Revenue Department has filed criminal complaints against various companies for tax fraud worth 3.27 billion baht over the past several months, says director-general Satit Rungkasiri.
One case involved companies trading in construction materials and textiles purchasing fraudulent receipts from criminal gangs for use in inflating expenses and thereby reducing tax bills.
The department suspects the receipts are used to cover expenses that otherwise cannot be booked on the company's accounts such as bribes paid to state officials.
Authorities will trace the origin of the false receipts to see whether other firms are involved in the scam.
The department noted the fraud involved fake receipts with a face value of 8.8 billion baht that were sold off to other companies for their tax returns.
The fake receipts resulted in lost tax revenue of 619 million baht in value-added tax (VAT) and 2.65 billion in corporate tax.
The Revenue Department and the Crime Suppression Division recently filed charges against Thanakrit Hilee for operating a website promoting the sale of fraudulent receipts.
Mr Thanakrit is charged with selling receipts for tax fraud worth 400 million baht, resulting in lost state revenue of 30 million baht in VAT and 100 million in corporate tax.
Use of a fake or improper receipt for tax purposes is a crime punishable by a jail term of three months to seven years and a fine of 2,000 to 200,000 baht.