Goods and Services Tax (GST) is India’s unified indirect tax system. This guide covers everything you need to know about calculating GST correctly.

GST Rate Slabs

India has four primary GST rates: 5%, 12%, 18%, and 28%. Most goods and services fall under the 18% standard rate.

GST Exclusive Calculation

When the price doesn’t include GST:

  • GST Amount = Base Price × Rate / 100
  • Total Price = Base Price + GST Amount

Example: ₹10,000 + 18% GST = ₹10,000 + ₹1,800 = ₹11,800

GST Inclusive Calculation

When the price already includes GST:

  • Base Price = Inclusive Price / (1 + Rate/100)
  • GST Amount = Inclusive Price - Base Price

Example: ₹11,800 inclusive at 18% = ₹11,800 / 1.18 = ₹10,000 base + ₹1,800 GST

CGST and SGST

For intra-state sales, GST splits equally: 9% CGST + 9% SGST = 18% total. For inter-state sales, 18% IGST applies.

Use Our GST Calculator

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