Value of Supply and Change in Rate of Tax under GST (CA Final)

Understand Value of Supply and Change in Rate of Tax

Key rules to remember

Transaction value

Value of supply = price actually paid or payable + items added under section 15(2) − discounts deducted under section 15(3)

Applies only if supplier and recipient are not related and price is the sole consideration for the supply.

Items added to the value

Add: (a) taxes, duties, cesses, fees and charges under other laws (not GST or compensation cess) if charged separately by the supplier; (b) amounts the supplier owes but the recipient pays; (c) incidental expenses such as commission and packing charged by the supplier; (d) interest, late fee or penalty for delayed payment; (e) subsidies directly linked to price, other than Central and State Government subsidies

Remember the limit in (e): only subsidies other than Central or State Government subsidies are added. Government subsidies fall outside (e), so they are not added.

Discount before or at the time of supply

Deduct if it is recorded in the invoice

A discount not shown in the invoice at the time of supply does not qualify under this limb.

Discount after the supply

Deduct only if (i) agreed in an agreement made before or at the time of supply, (ii) specifically linked to relevant invoices, and (iii) recipient reverses the ITC attributable to the discount

All three conditions must hold. A surprise year-end discount fails the first test.

Non-monetary consideration (Rule 27)

Value = open market value of the supply; if not available, money value of the consideration plus the monetary part; if still not determinable, use Rule 30, then Rule 31

Applies when consideration is not wholly money and the supplier and recipient are unrelated.

Pure agent (Rule 33)

Expenses incurred as a pure agent and recovered at actual cost are excluded from the value

The supplier must act as pure agent under a contract, the amount must be shown separately, and the recipient must receive the goods or services in their own right.

Change in rate: supply before the change

Invoice and payment both after change → earlier of the two dates → new rate. Invoice before change, payment after → invoice date → old rate. Payment before change, invoice after → payment date → old rate

Only when both events fall after the change does the new rate apply to a supply made before the change.

Change in rate: supply after the change

Invoice and payment both before change → earlier of the two dates → old rate. Invoice before, payment after → payment date → new rate. Payment before, invoice after → invoice date → new rate

The new rate applies in every case except the one where both invoice and payment were before the change. Payment alone before the change does not save the old rate.

Date of receipt of payment

Earlier of (i) date the payment is entered in the books of account, and (ii) date the payment is credited to the bank account

Use this earlier date when the question gives both dates.

How to solve Value of Supply and Change in Rate of Tax questions

1. 1Check whether the transaction value applies. Are the parties unrelated? Is price the sole consideration? If not, use the valuation rules (Rule 27 onwards) instead.
2. 2Write the price actually paid or payable as the base. Strip out any GST and compensation cess already included in it.
3. 3Add the section 15(2) items one by one: other-law taxes charged separately, supplier's liability paid by recipient, incidental expenses, late fee or interest, and subsidies directly linked to price that are not from the Central or State Government.
4. 4Deduct eligible discounts under section 15(3). Test each discount: is it in the invoice, or agreed in advance, linked to invoices, and backed by an ITC reversal?
5. 5Total up to get the value of supply. Show each line so a wrong item costs you one mark, not the whole answer.
6. 6If the question mentions a rate change, list three dates: date of supply, date of invoice and date of payment. Compare each with the effective date of the new rate.
7. 7Apply the section 14 case that matches your dates. Name the case in words (for example, supply before change, invoice before change, payment after).
8. 8Compute tax as value × rate for the rate in force on the time of supply. Then state the conclusion in one line.

Quickest way: Date-line and add-deduct list

Common mistakes in Value of Supply and Change in Rate of Tax

• Adding GST or compensation cess to the value of supply.

  Students see 'taxes' in section 15(2)(a) and assume GST is covered.

  Fix: Section 15(2)(a) covers taxes under other laws only. It expressly excludes tax under the GST Acts and compensation cess. GST is computed on the value, not included in it.

• Adding a Central or State Government subsidy to the value.

  Students remember that subsidies directly linked to price are added, and forget the exception.

  Fix: Add only subsidies from others that are directly linked to price. Government subsidies are left out.

• Deducting a post-supply discount without checking conditions.

  The word 'discount' looks like an automatic deduction.

  Fix: A discount given after supply needs a prior agreement, a link to specific invoices and an ITC reversal by the recipient. If any one is missing, it stays in the value.

• Using the wrong date for the rate when the rate changes.

  Students apply the normal time of supply under section 12 or 13 and ignore section 14.

  Fix: Always place the three dates on a date line. Then match the case in section 14 and use the resulting time of supply to pick the rate.

• Treating the date of receipt of payment as just the bank credit date.

  Students do not read the explanation that defines the date of receipt.

  Fix: If both dates are given, use the earlier of the date in the books of account and the date of credit in the bank account.

• Excluding incidental charges such as packing or freight because they are billed separately.

  Students think a separate line item means a separate supply.

  Fix: Incidental expenses charged by the supplier, such as commission and packing, form part of the value even when shown separately. Also check composite supply rules if the question suggests a bundle.

Worked examples