"We are not opposing GST. But there are some concerns which will be raised by the state at the appropriate fora," Finance Minister T M Thomas Issac said.
The minister was replying to questions in the assembly in this regard.
The long-pending GST bill, which is aimed at overhauling the taxation system in the country, is expected to be taken up in the Rajya Sabha during the coming Monsoon session due next month.
Issac said the Kerala government also proposed to introduce a new version of the 'Lucky VAT' scheme, which would be sans coupons.
Checkposts would be made corruption free, he added.