How to Calculate GST in India
GST is calculated on the base price. India has 5 GST rate slabs: 0%, 5%, 12%, 18% and 28%.
Formula — Adding GST (Exclusive)
GST Amount = Base Price x GST Rate / 100
Example: Rs.1,000 base + 18% GST = Rs.180 GST. Total = Rs.1,180
Formula — Extracting GST (Inclusive)
GST Amount = Total Price x GST Rate / (100 + GST Rate)
Example: Rs.1,180 total with 18% GST = Rs.180 GST. Base = Rs.1,000
CGST vs SGST vs IGST
- Intra-state: 18% split as 9% CGST + 9% SGST
- Inter-state: 18% IGST (goes to Centre)