How to compute GST?

Step 1: Find the GST Rate Applicable for the Goods or Service
Find HSN Code or SAC Code
Determine the GST Rate applicable for the HSN or SAC Code

Step 2: Determine the Applicability of IGST or CGST and SGST
Inter-State Supply
Intra-State Supply
Calculating IGST, CGST and SGST

Step 3: Determine if GST is Chargeable on Reverse Charge Basis

Step 4: Is the Supplier Enrolled under GST Composition Scheme

Step 5: Determine Type of Transaction
B2B
B2C