CS Professional · Goods and Services Tax (GST) and Corporate Tax Planning

Value of Supply under GST for CS Professional

Value of supply is the amount on which GST is charged. Under Section 15 of the CGST Act, it is the transaction value: the price actually paid or payable, where the parties are not related and price is the sole consideration. You add the listed inclusions, deduct only eligible discounts, and use the prescribed rules where the price cannot be used.

What this chapter covers

This chapter tells you how to find the taxable amount for a supply. Rate of tax is applied to this amount, so an error in value flows into your tax liability, your invoice and your input tax credit. The core rule is transaction value in Section 15(1). It applies only when the supplier and recipient are not related and the price is the sole consideration.

The chapter then builds around that rule. Section 15(2) lists what must be added: other-law taxes charged separately, amounts the supplier owed but the recipient bore, incidental expenses such as commission and packing, interest, late fee or penalty for delayed payment, and subsidies directly linked to price (other than Central and State Government subsidies). Section 15(3) says which discounts can be left out. Where the transaction value cannot be used, Section 15(4) and (5) send you to the prescribed valuation rules. The Explanation to Section 15 defines related persons. You should also cover the special cases and the pure agent concept taught in your study material.

In the paper, this chapter links to time and place of supply, input tax credit, invoicing and the levy provisions. A case question can give you a bill with several items and ask you to compute the taxable value, so practise that format.

GST carries 70 of 100 marks in Elective 2 (7.2), so this chapter sits in the larger part of the paper. Value of supply is easy to frame as a written case: facts, the Section 15 provision, an item-by-item analysis, and a conclusion with a figure. Valuation feeds into tax computation, so an error here carries into the figures that follow. If you learn the inclusions, the discount conditions and the related person tests precisely, you can handle unfamiliar facts with confidence.

Value of Supply: topics in the order to study them

1Transaction Value and Section 15 BasicsStart here because every other topic is an exception or an addition to the transaction value rule in Section 15(1).
2Inclusions in Value of SupplyNext learn what gets added under Section 15(2), since most computation questions test this list.
3Discounts and Their TreatmentDiscounts are the main deduction, so study them right after inclusions to see both sides of the computation.
4Related Persons and Valuation RulesOnce the normal rule is clear, learn when it fails: related persons, and the fallback to prescribed rules under Section 15(4) and (5).
5Special Valuation Cases and Pure AgentFinish with the special cases and pure agent treatment, which need the earlier concepts to apply correctly.

How to prepare Value of Supply

Treat this chapter as a rule plus a checklist. Learn the wording of Section 15, then practise applying it to bills until the steps become automatic.

Read Section 15 slowly and write sub-section (1) to (5) and the Explanation in your own words, keeping the exact conditions.
Make a one-page list of the five inclusions in Section 15(2), each with a short example in rupees.
Write the conditions for discounts: before or at supply and recorded in the invoice, or after supply with an agreement at or before supply, link to invoices, and reversal of input tax credit by the recipient.
Memorise the eight related person situations in the Explanation, including the 25 per cent holding test, and the sole agent, distributor or concessionaire rule.
Solve at least five computation cases by listing each item on the invoice, tagging it as include, exclude or check, and then totalling.
Draft answers in the exam format: provision, facts, analysis, conclusion. Then revise the pure agent and special cases from the study material.

Common mistakes in Value of Supply

Applying transaction value without checking whether the parties are related or price is the sole consideration.
Fix: State both conditions first in every answer, then say whether the facts satisfy them.
Excluding a discount that is not properly recorded or conditioned.
Fix: Check timing, invoice recording, agreement, link to invoices and ITC reversal, then conclude.
Adding government subsidies to value.
Fix: Include only subsidies directly linked to price, and exclude those from the Central or State Governments.
Missing the 25 per cent test or the sole agent rule for related persons.
Fix: Learn the eight situations listed in clause (a) of the Explanation. Then learn clause (c) separately: persons associated in business, where one is the sole agent, sole distributor or sole concessionaire of the other, are deemed related.
Including the GST charged on the invoice in the taxable value.
Fix: Separate tax charged under this Act from the value before computing tax.
Writing only the answer figure with no provision or reasoning.
Fix: Cite Section 15 and the sub-section, give the working line by line, then conclude.

Last-day revision: Value of Supply

Value of supply = transaction value = price actually paid or payable, if parties are not related and price is the sole consideration.
Transaction value under Section 15(1) applies only where the parties are not related and price is the sole consideration. Where the value cannot be determined under Section 15(1), it is determined in the prescribed manner (Section 15(4)).
Taxes, duties, cesses and fees under any law other than the CGST, SGST, UTGST and GST (Compensation to States) Acts are included if charged separately by the supplier.
Amounts the supplier must pay but the recipient bore are added if not in the price.
Incidental expenses like commission and packing charged to the recipient are included.
Interest, late fee or penalty for delayed payment is included.
Subsidies directly linked to price are included, except Central and State Government subsidies.
A discount at or before supply is excluded only if recorded in the invoice.
A post-supply discount needs an agreement at or before supply, link to invoices and ITC reversal by the recipient.
Related persons under clause (a) of the Explanation include those holding 25 per cent or more of the voting stock or shares of both, family members, and employer and employee. Under clause (c), persons associated in business, where one is the sole agent, sole distributor or sole concessionaire of the other, are also deemed related.
Always show the total taxable value clearly before applying the tax rate.

Value of Supply practice questions

Value of Supply in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Value of Supply: frequently asked questions

What is the basic rule for value of supply under GST?

Under Section 15(1), the value is the transaction value, meaning the price actually paid or payable. It applies where the supplier and recipient are not related and the price is the sole consideration for the supply.

Which items are added to the transaction value?

Section 15(2) adds separately charged taxes and fees under other laws, amounts the supplier owed but the recipient bore, incidental expenses such as commission and packing, interest or late fee for delayed payment, and subsidies directly linked to price. Central and State Government subsidies are excluded.

When is a discount excluded from value?

A discount given before or at the time of supply is excluded if it is recorded in the invoice. A discount given after supply is excluded if an agreement at or before supply establishes it, it is linked to relevant invoices, and the recipient has reversed the attributable input tax credit.

Who are related persons for GST valuation?

Clause (a) of the Explanation to Section 15 lists eight situations: officers or directors of each other's businesses, legally recognised partners, employer and employee, common 25 per cent or more voting holding, one controlling the other, both controlled by a third person, together controlling a third person, and members of the same family. Clause (c) separately deems persons related where one is the sole agent, sole distributor or sole concessionaire of the other.

Is this chapter asked as a computation or as theory?

Expect both within one case-based question. You usually need to analyse the facts against Section 15 and then compute the taxable value, so practise writing the reasoning with the working.