GST Rate Reclassification: Effect on Existing Contracts/Pricing

Are you wondering what happens to your existing contracts when the GST rate changes? A rate revision can affect fixed pricing, cash flow, and tax obligations, making it important to reassess active agreements and invoices. Under Section 14 of the CGST Act, the applicable tax rate is determined based on the relevant timing of the supply, invoice, and payment.

Meanwhile, Section 64A of the Sale of Goods Act allows contract prices to be adjusted for tax rate changes unless the agreement states otherwise. Reviewing ongoing contracts, raising additional invoices where required, and updating accounting systems can help maintain smooth GST compliance. 

What is GST rate reclassification, and how does it affect existing contracts?

GST rate reclassifications are when the GST Council changes the rate of a product or service from one tax slab to another, or provides clarity on an HSN classification. In a day-to-day transaction, it is simple to implement a GST rate update. However, when a rate change happens, there is an instant price vs. tax gap with ongoing contracts such as multi-year construction projects, software subscriptions, or annual maintenance retainers.

If tax rates change, you will have to decide whether to bear the financial difference (supplier) or pass it on to the buyer. Understanding your legal position helps to eliminate revenue leakage and maintain client relationships.

To explain this to you with a simple example, an IT vendor entered into an AMC of ₹10,000/- per month for 2 years with 18% GST. If the government changes its classification to 28% midway, who bears the additional burden of paying ₹1000/month? If there is no specific contract provision, the vendor may lose ₹12,000 a year.

Follow our step-by-step guide to HSN code reclassification under GST.

How does Section 14 use the "Majority Rule" to determine your applicable tax rate?

Determining which tax rate applies when there is a change in the GST rate relies on Section 14 of the CGST Act. Section 14 uses a simple "Majority Rule" based on three timeline markers:

1. Date of supply (when goods or services are delivered)
2. Date of invoice (when the bill is raised)
3. Date of payment (when money is received or recorded)

Whichever period (pre-change or post-change) holds at least two out of these three events dictates the tax rate you must charge.

• Supply and Invoice before rate change (Payment after): Old rate applies.
• Supply before rate change (Invoice and Payment after): New rate applies.
• Supply and Invoice after rate change (Payment before): New rate applies.

Scenario: A commercial printer delivers 10,000 flyers on May 20 (old rate: 12%). The tax rate jumps to 18% on June 1. The printer issues the invoice on June 5 and receives payment on June 10. Since two events (Invoice and Payment) occurred after the rate change, the new 18% rate applies to the entire shipment.

The official GST portal offers information on the Time of Supply Rules under Section 14 of the CGST Act.

Does Section 64A of the Sale of Goods Act protect suppliers from tax increases?

For contracts involving the sale of goods, Section 64A of the Sale of Goods Act, 1930 provides statutory protection when GST rates change. Under Section 64A, unless a different intention appears from the terms of the contract, the contract price adjusts automatically when a tax on goods is imposed, increased, decreased, or remitted after the contract is signed:

• When taxes go up: The seller can add the increased tax amount to the contract price and recover it from the buyer.
  When taxes go down: The buyer can deduct the equivalent tax reduction from the contract price.

Important: Section 64A applies only to contracts for the sale or purchase of goods. It does not cover service contracts such as AMCs, software subscriptions, or consulting retainers. For service contracts, the adjustment depends entirely on the terms of the agreement — look for a "Change in Law" or price-revision clause.

How do GST tax rate changes impact fixed-price vs. tax-exclusive contracts?

It depends on your contract; tax-exclusive agreements usually pass the change to the buyer, while fixed tax-inclusive prices may leave the supplier to absorb it.

What practical steps should businesses take to adapt pricing and stay GST compliant?

Review your contracts, update invoices and tax rates, reassess ITC, and align your billing systems to stay compliant when a government notification changes tax classifications:

1. Identify and categorize active contracts: Tax-inclusive, tax-exclusive, and tax-silent. Look for any "Change in Law" or price-revision clause.
2. Raise a debit or credit note: Where goods/services have been supplied at the old rate but are invoiced at the new rate, issue a debit note (for an increase in tax) or a credit note (for a decrease in tax) within statutory deadlines.
3. Rethink Input Tax Credit (ITC) flow: A rate cut can be accompanied by restrictions on ITC (e.g., a restaurant service rate cut to 5% without ITC). If your input credits are blocked, immediately recalculate your total cost structure.
4. Update billing software: Remap HSN codes and update tax rates in ERP before creating new invoices.

Follow our step-by-step instructions on how to issue Credit and Debit Notes in Tally/Accounting Software.

How can accounting software simplify your tax rate updates?

Instead of manually updating every invoice, let your software handle the heavy lifting. Modern business management software can automatically apply revised tax rates, account for Section 14 time-of-supply rules, and simplify debit and credit note management. Explore our finance management solutions today and ensure your business stays compliant and profitable with each tax change.