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In India, a GST rate revision affects only the supplies covered by the applicable rate notification—not every product or service in your billing system. Before changing a tax setting, verify the supply’s classification and rate, establish the effective date, and review any transaction that crosses that date under the time-of-supply rules. Then configure and test the new rate without changing previously issued invoices.
What changed in the 2025 GST rate revision?
The Government of India said that revised GST rates for most goods and services, other than specified tobacco products, took effect on 22 September 2025. The applicable revisions are set out in official rate notifications. That date is a reason to check which of your supplies changed; it is not a direction to assign one new rate to every item.
For each affected good or service, confirm its classification and the rate in the relevant notification before editing your software’s tax table. A general news summary or another business’s settings cannot establish the rate for your supply.
How do I update GST rates in my billing software?
- Verify the rate and classification. Find the current notification that applies to each supply you sell or provide, and map the affected items or services to their correct classification and rate.
- Set the effective date. If your software supports effective-dated tax rates, enter the date from which the new rate applies. Retain the previous rate configuration for historical records and transactions that need transition review.
- Identify transactions around the change. Review open orders, supplies made before the change but invoiced later, advances, and other transactions that span the effective date. Do not select the rate solely from the invoice date; assess the applicable time-of-supply rule and transaction facts.
- Check tax calculations and invoice output. Confirm that the software calculates tax at the intended rate and displays the rate and tax amount on the invoice. Check any required correction-document workflow as well.
- Check e-invoice output and submission. If you use e-invoicing, confirm that your software’s current output format and connection or upload route support the configured rate. Do not assume that one portal’s features are available in every vendor’s software.
- Test, reconcile, and document the change. Run representative invoices, including transition cases, in a controlled workflow. Reconcile sample calculations and output before using the configuration for production invoices. Keep a dated record of the rate notification, configuration change, and reviewer approval.
What software support should you look for?
For this task, useful capabilities include effective-dated tax settings, item- or service-level rate mapping, accurate invoice rendering, preservation of historical invoice records, and support for the e-invoice output or upload route your business uses. The right workflow depends on transaction volume, existing system integration, file-format compatibility, and whether you need an API or manual portal entry.
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As one portal-specific example, GSTN-powered IRIS IRP’s production release notes state that a 40% GST rate was added to its tax-rate master on 21 September 2025 and incorporated across its API, web form, Excel utility, and JSON upload. The portal also describes single invoice generation through a web form and bulk generation by upload. This illustrates how a rate change may be implemented across different input methods; it does not mean 40% applies to all businesses or supplies, or that other software providers offer the same functions. See the IRIS IRP notifications.
What GST rate applies if I invoice after a rate change?
The invoice date alone does not settle the rate for every transaction that crosses a revision date. The Government of India FAQ says section 14 of the CGST Act governs time of supply in the described cases. For a supply made before a rate change but invoiced afterward, it says that if payment is received after the change, the time of supply is the earlier of payment receipt and invoice issue. If payment was received before the change, the time of supply is payment receipt. For an advance where the supply is not complete or the invoice has not been issued, the FAQ says to follow the time-of-supply rules.
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Use the facts of the transaction and the applicable statutory rule to determine the rate; do not automatically apply the new rate just because the invoice is created after the effective date. The government’s FAQ on the 2025 GST changes addresses the transition scenario, but a business should assess its own circumstances before issuing an invoice.
Should I edit an invoice that was already issued?
Do not silently change an old issued invoice as part of a tax-table update. CBIC’s tax-invoice rules include the rate of tax and amount of tax charged among the required invoice particulars. Supplementary invoices and credit or debit notes have their own particulars, including a reference to the original invoice and the value, rate, and amount credited or debited. Preserve the original record and use the appropriate correction document when a correction is required. See CBIC’s Tax Invoice, Credit and Debit Notes rules.
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Does a GST rate revision change small-business registration thresholds?
For the 2025 revision, the Government of India FAQ says registration thresholds remained the same; only tax rates on certain supplies were revised. That answer is specific to this revision and does not establish a business’s registration requirement in every circumstance. The government FAQ states: “The threshold limits for GST registration remain the same. Only the tax rates on certain supplies are being revised.”
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