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Section 8 — Tax Liability on Composite & Mixed Supplies

When a business sells more than one thing together — think of a Diwali gift hamper with chocolates, a box, and a ribbon — the GST department needs to know: which rate applies? That's exactly what Section 8 solves. It gives you a clear, mechanical rule so there's no room for guesswork.

First, understand the two types. A composite supply is a natural bundle — things that are naturally sold together, where one item is the principal supply (the main one) and the rest are ancillary. Classic example: Mr. Sharma books a hotel room and the hotel charges for the room + breakfast + Wi-Fi together. The room is the principal supply; breakfast and Wi-Fi are secondary. Under Section 8(a), the entire bundle is taxed at the rate of the principal supply — so the whole package attracts the hotel-accommodation GST rate, not separate rates for food or internet. The key test: would you naturally buy the ancillary items separately? If no, it's composite.

Second, a mixed supply is an artificial bundle — things that could be sold separately but the seller bundles them for commercial reasons. Example: Rajesh & Co. Pvt. Ltd. sells a box containing fruit juice (12% GST), namkeen (18% GST), and a toy (12% GST). None of these naturally goes with the other — the seller is just packaging them together. Under Section 8(b), the entire bundle is taxed at the highest rate among all the items — so the whole box attracts 18% GST (the namkeen rate), even the juice and toy.

The exam shortcut: Composite → Principal supply's rate. Mixed → Highest rate. Always ask yourself — is this a natural bundle with a main item (composite) or an artificial club deal (mixed)? This section is asked frequently as a 4-mark or 6-mark question, often paired with a numerical or a scenario to classify and compute tax.

📊 Worked example

Example 1 — Composite Supply

Ms. Iyer books an AC sleeper train ticket from Mumbai to Delhi on a private rail operator. The ticket price of ₹3,500 includes the seat, meals, and a travel blanket. The meals are incidental — you wouldn't book them separately.

Classification: Composite supply. Principal supply = passenger transportation.

GST Rate on passenger transportation = 5%

| Component | Value |

|---|---|

| Ticket (seat + meals + blanket) | ₹3,500 |

| GST @ 5% (principal supply rate) | ₹175 |

| Total payable | ₹3,675 |

Note: GST is NOT charged separately at 5% on transportation + 12% on meals. The entire ₹3,500 attracts only 5%.

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Example 2 — Mixed Supply

Rajesh & Co. Pvt. Ltd. sells a festive combo box for ₹1,000 containing:

  • Packaged sweets: ₹400 (GST 5%)
  • Dry fruits: ₹350 (GST 12%)
  • Branded pen: ₹250 (GST 18%)

Classification: Mixed supply — these items can be sold independently; they're bundled purely for sales promotion.

Highest GST rate among the three = 18% (branded pen)

| Total combo value | ₹1,000 |

|---|---|

| GST @ 18% (highest rate) | ₹180 |

| Total invoice value | ₹1,180 |

Don't apply 5% to sweets and 12% to dry fruits separately — the entire ₹1,000 is taxed at 18%.

⚠️ Common exam mistakes

  • Students mix up the two types: Don't assume every bundle is a composite supply. Ask: can each item be sold separately AND is the bundling artificial? If yes to both → mixed supply, not composite.
  • Wrong rate for mixed supply: Students sometimes apply an average rate or the rate of the dominant item by value. Wrong — Section 8(b) says strictly the highest rate, regardless of which item has the largest share in value.
  • Ignoring the 'naturally bundled' test for composite: Many students define composite supply as just 'two items sold together.' The real test is that the ancillary supply must be naturally linked to the principal and not ordinarily supplied separately.
  • Forgetting that composite supply rate = principal supply rate, not highest rate: A common slip in exams — students apply the 'highest rate' rule to composite supplies. Remember: highest rate is ONLY for mixed supplies.
  • Not identifying the principal supply correctly: In a composite supply question, if you identify the wrong principal supply, your entire tax calculation will be wrong. Ask: what is the customer actually paying for primarily? That's the principal supply.
📖 Bare Act text — Section 8, CGST Act 2017 (click to expand)
The tax liability on a composite or a mixed supply shall be determined in the following manner, namely:— (a) a composite supply comprising two or more supplies, one of which is a principal supply, shall be treated as a supply of such principal supply; and (b) a mixed supply comprising two or more supplies shall be treated as a supply of that particular supply which attracts the highest rate of tax.
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