To update GST rates correctly, first confirm the notified rate and effective date for the exact goods or services, then apply the time-of-supply rules to transactions around the change. Only after that should you update your accounting or billing system and test the invoices it produces. Changing a software tax setting is an operational step; it does not decide which rate the law requires.
Confirm the rate and effective date before changing software
Check the applicable government notification for the exact product or service classification and its effective date. A GST Council recommendation or general announcement is not a substitute for the notification that applies to the supply. The GST Council’s central tax-rate notifications index is a starting point; confirm the relevant notification and classification before configuring a rate.
Do not treat a general rate-change summary as a complete rate chart. For example, a Ministry of Finance FAQ published by PIB on 3 September 2025 said that changes for goods and services other than specified tobacco products would take effect on 22 September 2025, while existing rates and compensation cess for those specified products would continue until a later notified date. That is an account of that particular change round, not confirmation of the rate applicable to a transaction today. Check the classification-specific notification for the transaction in question: GST Council notifications and the Ministry of Finance FAQ.
Which GST rate applies near the change date?
Do not assume that the invoice date alone determines the rate. Section 14 of the CGST Act sets out time-of-supply rules for a change in tax rate by considering whether the supply, invoice and payment occur before or after the change. The date an administrator changes a rate in software is not one of those statutory factors. Apply the rule to the actual transaction facts using section 14 of the CGST Act.
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One example in the Ministry of Finance FAQ concerns a supply made before the rate change where the invoice is issued afterward. If payment is received after the change, time of supply is the earlier of payment receipt or invoice issue; if payment was received before the change, time of supply is the payment-receipt date. Other combinations have their own rules, so check section 14 rather than extending this example to every transaction. See the FAQ and the Act.
Stock and advances
Holding stock purchased at an earlier rate does not, by itself, preserve that rate for a later outward supply. The Ministry of Finance FAQ states, “GST is levied on supply,” and says the revised rate applies to outward supplies made on or after it takes effect, subject to the statutory timing rules. For advances, the FAQ directs businesses to determine the rate under the time-of-supply provisions; the answer depends on the relevant facts. See the Ministry FAQ and section 14.
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Input tax credit is a separate question
A change in the rate on your outward supplies does not automatically change the historical rate on an earlier purchase. The FAQ says a registered recipient may claim input tax credit, subject to other statutory conditions, when tax has been duly charged at the rate prevailing at the time of the inward supply. Credit, once duly availed, is subject to section 49(4); reversal may be required when outward supplies become exempt. Check the applicable conditions in the FAQ and current law before changing a return or credit treatment.
Update the accounting or billing system
Software controls help produce consistent invoices, but they do not replace classification, notification or time-of-supply checks. The following is a general operational workflow; menu names and capabilities vary by product.
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- Identify the affected supplies. Match each product or service to its relevant classification and the official notification. Note product-specific exceptions and the date the new treatment takes effect.
- Map the tax treatment. Identify affected products, services, tax codes and transaction types. Keep configurations distinct where place of supply, inter-state versus intra-state treatment, exemption, cess or another classification detail changes the invoice treatment.
- Enter the new rate appropriately. If the software supports effective-dated tax masters, enter the new rate with its effective date rather than replacing historical settings. Do not assume that changing a master retroactively corrects transactions already recorded or issued.
- Test sample invoices. Test transactions on both sides of the effective date, including applicable local and inter-state cases. Check taxable value, rate, tax amounts and the printed or electronic invoice fields.
- Check connected e-invoicing systems. Confirm that the relevant vendor tax-rate master and integration accept the applicable rate. Updates are not necessarily automatic or simultaneous across accounting applications and invoice-registration services.
- Keep an operational record. Retain the source notification, internal approval or configuration record, test results and list of affected transactions. This is a prudent control recommendation, not a single prescribed software audit-trail format established by the cited sources.
- Review transactions already in progress. Check issued invoices, advances, possible credit or debit notes, returns and e-invoice reporting under the applicable rules. Do not backdate or silently edit issued records; determine the correct treatment for each transaction.
Check the invoice output, not just the tax master
CBIC’s invoice rules require particulars that include the rate of tax and tax amount. After updating the system, inspect representative invoices and confirm that the applicable rate, calculated tax amount and tax split are correct for the transaction. The required particulars are set out in CBIC’s invoice rules.
For an inter-state or intra-state transaction, check that the system applies the appropriate tax treatment rather than merely displaying the expected combined percentage. Also verify that the electronic or printed invoice shows the required particulars and that the saved transaction matches the output.
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What an e-invoice rate-master update can—and cannot—tell you
A production release from IRIS IRP dated 21 September 2025 says that a 40% GST rate was added to its Tax Rate Master and made available through its API, web form, Excel utility and JSON upload. This illustrates how a rate-master change may be distributed across e-invoicing interfaces; it is not evidence that 40% applies generally, that another provider has the same capability, or that an IRP update selects the legally correct rate for your supply. See the IRIS IRP release.
For your own system, verify the current product documentation or ask the vendor how it handles effective dates, tax-code mapping, CGST/SGST versus IGST, invoice fields, credit and debit notes, integration updates and transaction auditability. Do not assume the software has updated merely because a notification was issued.
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