Goods & Services Tax (GST) can be calculated either by adding it to a base price (Exclusive) or extracting it from a final price (Inclusive).
Where: GST% = Rate (e.g., 5%, 12%, 18%, 28%).
Exclusive: You buy a service for ₹10,000. The provider adds 18% GST (₹1,800). Your total bill is ₹11,800.
Inclusive: You see a product priced at ₹11,800 (inclusive of 18% GST). The actual base price of the product is ₹10,000, and ₹1,800 is the tax.