Interstate purchase from unregistered dealer

Hi All,

 

I have one scenario and I need clarification on this. I am a Registered person in Tamilnadu,

 

I went to Karnataka and purchased a taxable product from Unregistered dealer. Here, the POS is Karnataka. What is the implication of tax for me while I file my return GSTR-3B? Will I be attracted to pay IGST on RCM or CGST/SGST on RCM?

 

Waiting for your clarification.

 

Thank you.