📘 Core concepts
- 1Sec 7 Supply — eight modes; Schedule I (deemed supply), Schedule II (clarification), Schedule III (neither).
- 2Composition scheme (Sec 10): goods ≤ ₹1.5 cr (₹75 lakh special states), services ≤ ₹50 lakh.
- 3Composite (principal supply tax rate) vs Mixed supply (highest tax rate).
- 4Reverse Charge categories — specified services + supplies from unregistered (Sec 9(4) selective).
- 5Place of Supply rules: Sec 10-13 IGST Act — different for goods, services, OIDAR.
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