Transaction Value Under GST: Meaning, Inclusions & Example

What Is Transaction Value?

Transaction value is the price actually paid or payable for a supply, and under GST it is the amount tax is charged on whenever the buyer and seller are not related and the price is the only consideration.

The rule is section 15(1) of the CGST Act. For most Indian shops and restaurants, transaction value is simply the bill amount before GST, but the Act adds certain charges to it and takes certain discounts off, and that is where invoices go wrong.

When Transaction Value Applies

Two conditions have to hold together:

• The parties are not related. Sales to a related person, such as a company under common control or your spouse trading as a sole proprietor, are valued under rule 28 instead.
• The price is the sole consideration. If part of the payment comes in another form, such as goods given in exchange, the price alone does not capture the value.

But when either fails, the GST valuation rules take over, usually starting from the open market value.

What Section 15(2) Adds to the Price

The Act lists five things that are part of the value even when they are shown separately:

1. Other taxes and fees charged separately, apart from GST and compensation cess themselves.
2. Costs the seller should have paid but the buyer paid, if they are not already in the price.
3. Incidental charges, including commission and packing, and anything the seller charges for work done at or before delivery.
4. Interest, late fee or penalty for paying the bill late.
5. Subsidies linked to the price, except subsidies from the Central and State Governments.

The fourth one catches owners out. Interest charged to a slow-paying customer is part of the value of the original supply, so GST applies to it too.

What Comes Off the Value

A discount given before or at the time of sale and recorded on the invoice is left out of the value under section 15(3)(a), which is why a festive offer printed as a line item discount cuts the GST as well as the price. Discounts given after the sale face stricter conditions.

For ordinary goods, MRP plays no part in this. A shop selling below the printed maximum retail price charges GST on what the customer actually pays.

Transaction Value Example

A sweet maker in Akola supplies Diwali boxes to a cotton ginning firm in October 2026, on one invoice.

Note: this is an invented example for illustration only. The businesses and amounts are not real.

The firm pays 40 days late, and the sweet maker charges Rs.1,150 interest as agreed. Under section 15(2)(d) that interest is taxed with the original supply, taking its value to Rs.83,550 once billed.

Where Invoices Go Wrong

Three errors come up around the edges of the price:

• Packing billed as a separate free-standing service with no GST, when it is an incidental charge on the goods.
• Late-payment interest collected without GST, often months after the original sale.
• A discount promised but not printed, so the invoice value, and the GST on it, stays at the full price unless the stricter post-sale conditions are met.

And the fix is usually the same: build the extras into the invoice from the start rather than settling them in a side ledger. Our guide to GST billing for restaurants shows how a compliant bill is laid out.

Get the Transaction Value Right on Every Bill

Petpooja Invoice makes accurate and automatic GST calculations on every invoice it generates. For a quick check by hand, try our GST invoice value calculator.

Before the Diwali orders start, pick one invoice for each kind of extra you charge, such as packing or a late fee, and check that it sits inside the taxable value.

Frequently Asked Questions