GST on Discounts, Freebies and Combo Offers: A Seller's Guide

Your Festive Discount Might Not Be Reducing Your GST Bill

Every seller running a festive-season sale assumes a discount just... reduces the tax. Charge ₹800 instead of ₹1,000, pay GST on ₹800, done. That's true for exactly one kind of discount — the one you apply before the invoice is generated. Everything else — a post-sale rebate to a distributor, a "buy 1 get 1 free" combo, a freebie bundled into a festive gift box — has its own valuation rule under Section 15 of the CGST Act, and getting it wrong is one of the more common ways sellers under-report tax without realising it, or leave GST notices waiting for them a year later during GSTR-9C reconciliation.

This matters more during Sept–Nov, when combo offers, festive bundles, and post-sale trade discounts to resellers all spike at once. Here's how each is actually valued.

Pre-Supply Discounts: The Easy Case

A discount given before or at the time of supply, and recorded on the invoice itself, reduces your taxable value automatically. This is Section 15(3)(a) — if the ₹200 off is shown as a deduction on the invoice you issue, GST is charged only on the net ₹800. No credit note, no separate reversal exercise, nothing to reconcile later. Standard checkout discounts, coupon codes applied at cart, and marked-down MRP sales all fall here, provided the discount appears on the invoice.

Post-Supply Discounts: Where Sellers Get It Wrong

A discount given after you've already issued the invoice — a volume rebate to a bulk buyer, a quarterly incentive to a distributor, a retroactive price adjustment — does not automatically reduce your GST liability. Section 15(3)(b) allows it only if all three conditions are met:

1. The discount was agreed upon before or at the time of the original supply — via a contract, price list, or documented scheme, not decided on the fly afterward.
2. It can be specifically linked to the relevant invoices — a blanket "10% off this quarter's business" without invoice-level traceability doesn't qualify.
3. The recipient reverses the input tax credit attributable to the discount amount.

If any one of these fails, the discount is real money you've given back, but it does not reduce your output GST — you still owe tax on the original invoice value. This is the single most common mistake in post-supply discounting: sellers issue a discount, adjust their books, and assume the GST liability shrank with it. It doesn't, unless a proper credit note under Section 34 is issued and the linkage conditions above are satisfied.

Practical fix: if you run recurring trade discount schemes with resellers or B2B buyers, get the discount terms into a written agreement or standing price list before the selling period starts — not after, when you're trying to retrofit Section 15(3)(b) compliance onto a discount you've already handed out informally.

The Credit Note Mechanism

To actually reduce GST liability on a post-supply discount, you issue a GST credit note under Section 34, referencing the original invoice(s), and declare it in your GSTR-1/IFF for that period. Your GSTR-3B liability drops accordingly, and the buyer's ITC gets adjusted down in their GSTR-2B automatically. Miss the credit note deadline — 30th November following the end of the financial year, or your GSTR-9 filing date, whichever is earlier — and the discount becomes a pure cost with no GST benefit, even if the customer genuinely got the money back.

If you're also dealing with input-side reversals from discounts you've received (not just given), it's worth reading our fuller Input Tax Credit guide — this post only covers the output-side discount mechanics.

BOGO and Combo Offers: The Free Item Isn't Actually Free

"Buy 1 Get 1 Free" and combo packs are the two offer types most sellers get wrong during festive sales, because the marketing language ("free!") doesn't match the tax treatment at all.

The rule: when you charge a single combined price for two or more items — one paid, one nominally "free" — GST law does not treat the free item as a zero-value, out-of-scope supply. It's treated as two individual supplies made for one combined consideration, and GST is payable on the full amount actually charged, not on some notionally discounted "real" item alone. If you sell a ₹999 kurta with a "free" ₹300 dupatta, you're not paying GST on ₹699 (₹999 minus a notional discount) — you're paying GST on the full ₹999 you actually collected, because that's the transaction value of both items combined. ITC on inputs used for the "free" item remains fully available to you as the supplier, since it's part of a genuine paid transaction, not a gratuitous gift.

Combo packs of different products raise a second question: what rate applies when the bundled items would individually attract different GST rates? This turns on whether the bundle is a composite supply or a mixed supply:

• Composite supply (Section 2(30)): the items are naturally bundled in the ordinary course of business, and one is clearly the principal supply — e.g. a mobile phone sold with its charger. Tax is charged at the principal item's rate.
• Mixed supply (Section 2(74)): the items are independent and could just as easily be sold separately, bundled together only for the offer — e.g. a skincare combo box with an unrelated stationery item thrown in. Under Section 8, a mixed supply is taxed at the highest rate applicable to any item in the bundle.

Sellers assembling festive gift boxes across product categories should check this before pricing — an incorrectly classified mixed supply taxed at a lower rate is an underpayment that surfaces at reconciliation time, not a savings.

"Free" Gifts and Freebies: When ITC Actually Gets Blocked

There's a meaningful difference between a combo offer (paid, single combined price) and a genuine giveaway (no consideration collected anywhere in the transaction). If you're handing out promotional items — a keychain with every festive order, a sample product to first-time customers — with no corresponding price adjustment, that's a gift under Section 17(5)(h), and input tax credit on the goods given away must be reversed. This is separate from, and unrelated to, the BOGO/combo mechanics above: a true freebie with zero consideration blocks ITC on that item; a "free" item bundled into a paid combo does not.

The mistake sellers make is treating every "free" marketing claim the same way. If your combo price already accounts for the second item, ITC is fine and GST is due on the combined price. If there's genuinely no consideration anywhere — a pure giveaway — reverse the ITC on the giveaway item and don't charge GST on it (since there's no supply for consideration to tax in the first place, only an ITC reversal obligation on the input side).

Common Mistakes, Summarised

• Assuming a post-supply discount automatically cuts GST liability without a credit note, a prior agreement, and invoice-level linkage under Section 15(3)(b).
• Undercharging GST on BOGO offers by taxing only the "paid" item instead of the full combined amount actually collected.
• Misclassifying a mixed supply as composite, applying the lower principal-item rate to a bundle that should be taxed at the highest rate in the box.
• Missing the Section 34(2) credit note deadline, turning a legitimate discount into a permanent cost with no GST benefit.
• Not reversing ITC on genuine giveaways — free samples and promotional freebies handed out with zero consideration attached.

Get any of these wrong during a high-volume festive sale, and the gap doesn't show up until your annual reconciliation — by which point it's a liability with interest attached, not a same-month fix.

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Discount and combo pricing errors are exactly the kind of thing that compound across a festive sales month and surface at annual filing. If your GST returns need a second set of eyes before the next filing deadline, get your GST returns filed by a CA rather than reconciling a quarter's worth of combo pricing after the fact.