To check whether a GST rate change affects a product or service, match its actual description and HSN or SAC classification against the legally operative GST notification, then verify the notification’s effective date, conditions, exclusions and any transaction-specific rules. A portal search can help identify a code, but it does not decide a disputed classification.
Start with a complete list of what you supply
Build the review around the actual goods and services you sell—not just internal product names or shorthand. Use invoice descriptions, catalogue entries and service scopes. Separate supplies that may look alike but differ in composition, use, packaging, customer or contractual scope.
For each supply, record its description, existing HSN for goods or service classification code (SAC) for services, current rate or exemption status, and the source for that classification. GSTN’s registration guidance describes using HSN for goods and service classification codes for services: GST Portal registration guide.
Look up the HSN or SAC, then verify the legal classification
The GST Portal’s HSN search can accept an item description or code and show the associated chapter, description and related codes, according to GSTN’s portal functionality notes. Use it as a lookup aid, not as a ruling that your supply legally belongs to that classification. Confirm classification against the applicable tariff and the precise facts of the supply.
#1 Best Overall
For return reporting, GSTN’s Table 12 advisory also describes an updated downloadable HSN/SAC list. The portal search and list are useful for finding and reporting codes; neither replaces the legal analysis of a classification that depends on product characteristics or service terms.
Check the notification that actually changes the rate
A GST Council announcement can provide context, but use the operative government notification to determine the rate and when it takes effect. Read the relevant schedule entry in full, including its product or service wording, conditions, exclusions, exemptions and any special valuation rules. Do not infer applicability from a headline, a code-search result or a similar product’s treatment.
The correct rate for an individual supply cannot be established without its description, classification, transaction details and the applicable item-level notification. If the schedule language does not clearly fit, have a GST practitioner or tax adviser review the classification rather than relying on a keyword match.
Check the transaction date and any special treatment
For transactions around the changeover, identify the relevant supply, invoice and payment dates and read any transition provisions in the notification. Do not assume that every transaction on or after one date automatically follows the new rate without checking the applicable rule and facts.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsAlso assess whether the supply involves bundled or composite treatment, an exemption, reverse charge or a special valuation requirement. These details can affect the tax treatment even when the product name or service description appears to match a schedule entry.
Make an impact register for each affected supply
Once you have compared the supply with the amended schedule, document the decision so accounts and operations can implement it consistently. A simple register can include:
- Exact product or service description and HSN/SAC
- Existing rate and proposed rate, with the notification and effective date
- Applicable conditions, exclusions, exemption or valuation treatment
- Relevant customer or transaction type and date considerations
- Affected SKUs or service lines, invoices, price lists, tax codes and returns
- Reviewer, decision date and any unresolved classification question
Update billing and reporting from the effective date
After confirming applicability, update the relevant accounting or ERP tax codes, e-invoice configuration where applicable, price lists, invoice templates and internal billing guidance. If customer pricing changes, align communications with the effective date and the terms of the sale.
Test representative invoices on both sides of the effective date, then reconcile the tax treatment with outward-supply return reporting. Retain the notification and the documented classification decision with the implementation record. Software can help maintain catalogue codes and apply configured rates, but it cannot determine a legally disputed classification for you.
The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Check current GSTR-1 Table 12 instructions before filing
GSTN’s advisory for Phase 3, applicable from the May 2025 return period, specifies 4-digit HSN reporting for taxpayers with preceding-financial-year AATO up to ₹5 crore and 6-digit HSN reporting for taxpayers above ₹5 crore. It describes separate B2B and B2C tabs in Table 12, code selection from a dropdown rather than manual entry, and an updated downloadable HSN/SAC list. The advisory said value validations were initially in warning mode.
Rank #4
These are reporting instructions, not a decision about which rate applies to a supply. Check the live portal and current return-period instructions before filing because portal validations can change. GSTN’s GSTR-1 guide describes entering HSN/SAC summaries and rates in Table 12.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Do not treat system updates as product-rate determinations
IRIS IRP release notes report that a 40% GST rate was added to its production tax-rate master on 21 September 2025. They also describe a validation relaxation from 1 February 2026 linked to Notification No. 20/2025 – Central Tax for qualifying RSP-based calculations, subject to stated HSN and document-date conditions. These are provider implementation details; they do not establish that a particular item is taxable at 40% or qualifies for the validation treatment. Check the applicable notification and current IRP or GST Portal status: IRIS IRP release notes and prerequisites.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
