According to the EC, it would investigate all programmes and policies considered by the petitioner as subsidies for exporters based on Vietnamese legal documents.
The documents are about investment incentives, preferential interest rates, and waiver or reduction of land lease besides import tax breaks for raw materials.
The EC has sought information about the exporters to identify compulsory defendants, and concerned parties have 15 days to provide the information.
After identifying or choosing the defendants, the EC will send them questionnaires to be answered within 30 days.
The investigation will take 13 months, according to the Viet Nam Competition Authority.
The Viet Nam Competition Authority has warned businesses to be prepared to face an increasing number of anti-dumping and anti-subsidy cases in major markets, especially the US and EU, which have so far filed the largest number of lawsuits against Vietnamese exports.
It recommended that they should use the early warning system it established in 2012.
The system is expected to help exporters predict the possibility of such lawsuits.