When a GST rate changes, the correct rate for a transaction near the effective date is not necessarily the rate on its invoice, payment, or delivery date alone. First confirm the effective date in the applicable rate notification, then apply the transition rules in section 14 of India’s CGST Act to the supply, invoice, and payment dates. The tax calculation is separate from the price agreed with the customer, and a rate change does not automatically erase or refund input tax credit (ITC).
Start with the notified effective date
GST rate changes take effect on the date specified in the relevant notification, and the date may vary by item, service, or exception. Confirm the correct HSN or SAC classification, the notification entry, any conditions or exemptions, and the applicable place-of-supply facts before changing an invoice rate. A news report or general rate chart is not a substitute for the notification that applies to the transaction.
The 56th GST Council FAQ, published by the Ministry of Finance / Press Information Bureau on 3 September 2025, said that changes for goods and services other than specified tobacco-related products would take effect on 22 September 2025. It said existing rates and compensation cess for cigarettes, chewing tobacco products such as zarda, unmanufactured tobacco, and beedi would continue until a later date was notified. Those dates describe that rate-change package; they are not a complete current tariff guide. Check the relevant notification for your item. Read the 56th GST Council FAQ.
Which GST rate applies when supply, invoice and payment straddle the change?
Section 14 of the CGST Act provides transition rules for a change in tax rate and overrides the ordinary time-of-supply rules in sections 12 and 13 for those cases. The result depends on whether the supply took place before or after the change and on when the invoice was issued and payment was received. There is no safe general rule to always use the invoice date, the payment date, or the delivery date.
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The table summarizes the section 14 cases. “Before” and “after” refer to the effective date of the rate change. “Payment” means receipt of payment, subject to the bank-credit proviso noted below. For a payment received after the change, the specified bank-credit case can treat payment as received before the change if the amount was credited to the recipient’s bank account within four working days after the change.
| When supply occurred | Invoice and payment chronology | Time of supply for the rate change |
|---|---|---|
| Before the change | Invoice and payment both after | Earlier of the invoice date or payment receipt date |
| Before the change | Invoice before; payment after | Invoice date |
| Before the change | Payment before; invoice after | Payment receipt date |
| After the change | Invoice and payment both before | Earlier of the invoice date or payment receipt date |
| After the change | Invoice before; payment after | Payment receipt date |
| After the change | Payment before; invoice after | Invoice date |
These are statutory transition cases, not a substitute for checking the precise dates and facts. The Act PDF available from CBIC is amended only through 1 January 2022; consult current legislation and notifications for later changes. CBIC’s CGST Act PDF, amended through 1 January 2022. The 2025 Council FAQ also gives examples involving supplies before its 22 September 2025 effective date with later invoicing or payment.
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Example: advance paid before the change, invoice after
If the supply occurred before the rate change, the customer paid before it, and the invoice was issued after it, section 14 points to the payment receipt date as the time of supply. By contrast, if supply occurred before the change and both invoice and payment followed it, the earlier of those two dates controls. Use the applicable branch rather than assuming that a later invoice resets the rate.
What to change in invoices and accounting systems
A rate change is a reason to review both transaction records and tax settings, not to overwrite old invoices indiscriminately. CBIC’s invoice guidance describes a general 30-day period for issuing service invoices, with listed exceptions; confirm the rule applicable to the service and circumstances. Invoice particulars and document treatment must follow the applicable law and rules. CBIC guidance on tax invoices, credit notes and debit notes.
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- Identify affected transactions. List open orders, advances, completed deliveries or services, invoice issue dates, and payment receipt dates around the effective date.
- Verify classification and notification. Confirm the HSN or SAC, rate entry, effective date, and any conditions or exemptions for each affected item.
- Apply section 14 to each chronology. Determine the relevant time of supply from the applicable transition branch before calculating tax.
- Update rate settings. Maintain rate masters in accounting, billing, ERP, POS, and e-invoice workflows as relevant. Check taxable value, tax rate, tax amount, and required invoice particulars.
- Reconcile documents and returns. Compare invoices and credit/debit notes with the transaction records and relevant return data. If a correction is legally warranted, use the applicable correction route and preserve a proper document trail rather than silently replacing an issued record.
A GSTN-authorised IRIS IRP update reported that a 40% rate was added to its production tax-rate master on 21 September 2025. That illustrates why systems may need configuration updates; it does not establish that any particular product or service bears that rate. The portal’s rate master cannot replace checking the applicable CBIC notification and classification. IRIS IRP production release updates.
How a rate change affects the final price
The tax rate determines the tax calculation on a correctly classified supply. It does not, by itself, set the supplier’s base price or automatically dictate the customer’s final retail price. Before quoting a revised total, check whether the contract or quote states a tax-exclusive price, a tax-inclusive price, or another agreed treatment.
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If the quoted price is tax-exclusive
When the base price stays the same, a lower rate reduces the tax amount and therefore the amount payable; a higher rate increases them. A supplier may separately change the base price for commercial reasons, so the tax-rate change alone does not establish the final quoted total.
If the quoted price is tax-inclusive
The total may remain the agreed amount while the tax component and the amount retained as value before tax change. The actual treatment depends on the contract and applicable law. Review quotes, customer communications, and billing settings before telling customers what they will owe.
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Section 15 of the CGST Act addresses transaction value in specified circumstances, including certain inclusions and exclusions. CBIC’s available Act PDF is amended only through 1 January 2022, so it should not be treated as a complete statement of later law. CBIC’s CGST Act PDF.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What happens to input tax credit after a rate change?
A change in an output tax rate does not by itself erase ITC that was duly availed. The 56th GST Council FAQ says a registered person may use eligible ITC in the electronic credit ledger to discharge output tax liability under section 49(4). The FAQ also distinguishes supplies made through 21 September 2025 from supplies made on or after 22 September 2025 where an outward supply became exempt: credit for the later exempt supplies must be reversed as applicable under the CGST Act. GST Council FAQ on ITC.
That does not mean every accumulated balance is refundable. A lower output rate, or a difference between the rate paid on inputs and the rate charged on sales, does not alone establish a right to a refund. Refunds depend on the statutory category, relevant notification, and transaction facts. The Council’s 3 September 2025 press release described a planned 90% provisional refund measure for inverted-duty structure pending statutory amendments; that announcement is not a general refund promise for every rate transition. 56th GST Council meeting press release.
Other ITC conditions continue to matter. CBIC’s rules guidance describes consequences, including interest, where a registered recipient does not pay the supplier the value plus tax within the applicable 180-day period. CBIC Circular 237/31/2024-GST reproduces the general section 16(4) cut-off as 30 November following the relevant financial year, or furnishing the relevant annual return, whichever is earlier, and discusses specified retrospective exceptions. These are general ITC rules, not special extensions or relief created by a rate change; verify current law and the transaction’s eligibility and records. CBIC input tax credit rules; CBIC Circular 237/31/2024-GST.
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- What notification and entry establish the effective rate for this exact good or service?
- What are the supply, invoice, and payment receipt dates, and which section 14 case matches them?
- Does the quote or contract make the base price tax-exclusive or the payable amount tax-inclusive?
- Are the item classification, rate master, invoice particulars, and connected systems aligned?
- Is the ITC eligible and properly documented, and does an exemption require a reversal?
- Does the proposed correction require a credit note, debit note, or another prescribed route?
For a live dispute, return position, or unusual supply, verify later amendments and notifications and review the complete transaction record with a qualified GST practitioner. The dated Council FAQ explains its 2025 rate package; it is not a full 2026 rate table.
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