Chennai, May 18 (IANS): Tamil Nadu's commercial tax department is investigating into tax suppression and evasion to the tune of Rs.1,522 crore, an official statement said on Monday.

The government is also taking action based on the result of audit and inspection with a total revenue effect of Rs.5,178 crore.

In a statement issued here on Monday, the government 315 files have been opened with prima facie tax suppression of Rs.894 crore during 2014-15. The figure is based on the data collected from other states.

In addition, verification of inter-state data by territorial circle offices resulted in detection of tax evasion of Rs.628 crore in 205 cases (in terms of tax dues and penalty), thus reaching the amount of Rs.1,522 crore.

"All these cases are under various stages of investigation and implementation," the statement added.

The state commercial taxes department in investigating intra- and inter-state transactions by collecting the data from inside and outside Tamil Nadu from central and state government agencies and analyzing such data to unearth tax evasion by certain dealers of Tamil Nadu.

The department also collects data from customs, central excise, income tax and other state commercial taxes departments, check posts and others.

According to the statement, a total of Rs.108.8 crore was collected last fiscal after surprise inspection and field audits.

"Further proposals were evolved bases on the result of audit and inspection with a total revenue effect of Rs.5,178 crore," the statement added.

The government warned dealers against unauthorized deletion or manipulation of sales data in the accounting software in computers.