GST Post-Supply Discount Rules: Who Now Pays the Tax

Your biggest dealer just hit its yearly target, and you owe it a ₹60,000 rebate. For years the GST post-supply discount rules made that payment awkward. Unless the rebate was written into an agreement before the sale and tied to specific invoices, you could not cut your GST for it. So you paid tax on a price you never actually collected.

That changed on November 1. A new GST post-supply discount rule now lets a plain credit note do the job, and a separate change speeds up refunds for businesses whose input tax runs higher than their output tax. Both changes move real cash for small manufacturers, distributors and dealers. Below is what changed, the math on a typical rebate, and the paperwork you need from this month on.

What Changed on November 1

The finance ministry issued Notification No. 03/2026 (Central Tax) on October 26. It brought sections 153 to 155 of the Finance Act 2026 into force from November 1, Business Today reported. Those sections rewrite three parts of the CGST Act: Section 15 on valuation, Section 34 on credit notes, and Section 54 on refunds.

Here is the short version of each:

• Section 15(3)(b), discounts: a discount given after the sale can come off the taxable value with just a GST credit note and an ITC reversal by the buyer.

• Section 34(1), credit notes: the law now names these discounts as a valid reason to issue a GST credit note, so the two rules finally match.

• Section 54, refunds: the 90% provisional refund route now covers inverted duty refunds, and the ₹1,000 minimum no longer applies to refunds on goods exported with tax paid.

None of this came out of nowhere. The Union Budget announced the discount and refund changes, and the Finance Act passed them. The notification only set the start date.

The GST Post-Supply Discount Rule, Before and After

Under the old wording, a discount after the sale could reduce the value of supply only if it was set out in an agreement made at or before the time of supply. It also had to be linked to the relevant invoices. Most real-world rebates failed both tests.

Think about how dealer schemes actually work. A paint or FMCG company announces a quarterly target in the middle of the quarter. The dealer earns 2% or 3% back only if it crosses a volume line. Nobody knows which invoices "earned" the rebate until the quarter closes.

So companies did the only thing they could. They issued commercial credit notes without GST, as an explainer on the tax site TaxGuru describes. The dealer got its money back. The supplier's output tax stayed on the full original invoice value.

What the new rule asks of each side

From November 1 the test has two parts. The supplier issues a GST credit note for the discount. The buyer reverses the input tax credit tied to that credit note. If both happen, the discount comes off the supplier's taxable value.

Rahul Shekhar, partner for indirect tax at Nangia Global, told Business Today the change "will enable businesses to offer discounts to dealers to drive sales." He pointed to FMCG, pharma, retail and consumer durables, where volume-based dealer incentives are routine.

Worked Example: A ₹60,000 Dealer Rebate

Say you are a distributor. A dealer bought ₹20 lakh of goods from you this quarter at 18% GST, so you charged ₹3,60,000 in tax. The dealer crossed its target and earned a 3% rebate. The question that matters now is whether that ₹60,000 is before or after GST.

Option A: the rebate is ₹60,000 plus GST

• You issue a GST credit note for ₹60,000 plus ₹10,800 GST, so ₹70,800 in total.

• Your output tax drops by ₹10,800.

• The dealer reverses ₹10,800 of input tax credit.

• Net cost to you: ₹60,000. Net gain to the dealer: ₹60,000.

Option B: the rebate is ₹60,000 all-in

• You issue a GST credit note for ₹60,000 in total: ₹50,847 of value plus ₹9,153 of GST.

• Your output tax drops by ₹9,153, so the rebate really costs you ₹50,847.

• The dealer reverses ₹9,153 of credit, so it nets ₹50,847, not ₹60,000.

Under the old commercial credit note, a ₹60,000 rebate cost you the full ₹60,000 and the dealer kept every rupee of its credit. Under Option B, the same headline number now costs you about ₹9,150 less. That gap is now a negotiating point in every scheme circular you send. If your circulars just say "3% rebate," expect dealers to read it as Option A.

If you want to check the tax split on any rebate amount, the GST calculator will back the tax out of an inclusive figure or add it to an exclusive one.

What Dealers and Buyers Must Do

The buyer's side of the rule is the part most likely to go wrong. The supplier's tax cut depends on the buyer reversing its credit. If the dealer never reverses, the supplier's reduction can be questioned in an audit.

For a small dealer, that means three habits:

1. Accept GST credit notes promptly on the portal and reverse the matching credit in the same period.

2. Keep the scheme letter or circular that explains why the discount was given. An officer can still ask.

3. Watch the deadline. A credit note still has to be declared by November 30 after the end of the financial year, or by the date you file the annual return, whichever comes first.

Suppliers have a matching to-do list. Switch your year-end and target schemes from commercial credit notes to GST credit notes from November 1. Tell dealers in writing that a reversal is expected. Your invoice templates and accounting software may need a new credit note type for this.

Faster Inverted Duty Refunds and the 90% Rule

The second change matters if your inputs carry a higher GST rate than your outputs. That is an inverted duty structure: you might buy raw material at 18% and sell the finished product at 5%. Credit piles up in your ledger faster than you can use it, and the refund route is how you turn it back into cash.

Before November 1, the 90% provisional refund in Section 54(6) mainly covered zero-rated supplies such as exports. It now extends to inverted duty refunds as well. According to an EY India tax alert, 90% of the amount claimed is sanctioned on the portal within three working days of acknowledgement, based on system-driven risk checks. Business Today described the window as seven days, so treat the exact timing as something to confirm on your first claim.

Input services now count

The rule change that lifts refund sizes is about input services. Following the GST Council's October meeting, credit on input services availed on or after November 1 counts toward inverted duty refunds, EY reported. Think job work charges, freight, warehouse rent and professional fees.

Two limits apply. Input service credit taken before November 1 does not qualify. And according to a Grant Thornton Bharat analysis, an inverted structure is still judged by comparing the rate on input goods with the rate on your sales. A higher rate on services alone does not make you eligible.

Worked Example: A Small Manufacturer's Refund

Take a small manufacturer that sells ₹10 lakh a month of finished goods at 5% GST. That is ₹50,000 of output tax. It buys ₹6 lakh of raw material at 18%, earning ₹1,08,000 of credit. It also pays ₹2 lakh a month for job work and freight at 18%, which is another ₹36,000 of credit.

Using a simplified version of the refund math (credit minus output tax, assuming all sales are inverted):

• Goods credit only, the old basis: ₹1,08,000 minus ₹50,000 gives about ₹58,000 a month.

• Goods plus services, the new basis: ₹1,44,000 minus ₹50,000 gives about ₹94,000 a month.

• Provisional release at 90%: roughly ₹84,600 arrives early, with the rest after verification.

The official Rule 89(5) formula apportions output tax across goods and services credit, so your actual figure will be lower than this sketch. Run the real formula with your accountant before you plan around it. The direction is clear, though: a business that pays heavily for services now gets more of its stuck credit back.

What Comes Next: Capital Goods and Small Exporters

Two more pieces round this out. First, capital goods credit joins the refund pool from April 1, 2027, EY's alert says. It is spread over 60 months, so a ₹12 lakh machine adds ₹20,000 of credit per month to the refund base, not ₹12 lakh at once.

Second, the ₹1,000 floor on refunds is gone for goods exported with tax paid. A small exporter with a ₹300 or ₹700 IGST refund can now claim it. That matters most to craft sellers and tiny exporters shipping low-value parcels abroad.

If you want the bigger picture on how rate cuts reshaped the tax, our look at how GST 2.0 could reshape India's economy covers the slab changes these procedural fixes sit on top of.

Frequently Asked Questions

Do post-supply discounts still need a prior agreement under GST?

No. From November 1, the Finance Act 2026 removed the pre-agreement and invoice-linking conditions in Section 15(3)(b). The discount comes off taxable value if the supplier issues a GST credit note and the buyer reverses the related input tax credit.

Can I still issue a commercial credit note without GST?

Yes, but it will not reduce your output tax. You simply keep paying GST on the original invoice value. For year-end and target rebates, a GST credit note is now usually the better option for the supplier.

What happens if my dealer does not reverse the input tax credit?

Your reduction in output tax can be questioned, because the buyer's reversal is a condition of the rule. Ask dealers to confirm the reversal in writing and keep that with the scheme circular.

Who gets the 90% provisional GST refund?

Businesses claiming refunds for zero-rated supplies, and now businesses with an inverted duty structure, subject to a system risk check. The rest of the claim is paid after verification.

Is input service credit refundable under inverted duty structure?

Yes, for credit availed on or after November 1. Credit taken earlier does not qualify, and eligibility still depends on your input goods carrying a higher rate than your sales.

The Bottom Line for Small Businesses

The new GST post-supply discount rule ends a long workaround. Dealer rebates can now carry tax the way they always should have, as long as both sides do their half of the paperwork. The money question is whether your scheme amounts are tax-inclusive or tax-exclusive, so settle that in writing before the next quarter's targets go out.

If you run an inverted duty business, file your next refund with input services included and watch how fast the 90% lands. And if GST basics still trip you up, start with our plain-English GST definition before you sit down with your accountant.