GST Rate Changes 2026: Seller Catalog Update Guide | SourceRightNow

Quick answer

After every GST Council meeting, the CBIC publishes a rate notification that takes effect on a specific date. Indian B2B sellers need to audit their HSN/SAC codes against the notification, bulk-update affected products on their marketplace catalogs, and issue versioned revisions on open quotes that straddle the effective date. Doing this in one 20-minute pass after each Council meeting keeps your catalog compliant and your invoices reconcilable at the buyer end.

Key points

Rate notifications from the CBIC specify an effective date; apply the new rate from that date forward on all new invoices.
Audit HSN codes at the chapter/heading prefix level, not only exact 8-digit codes — rate changes usually apply at a prefix.
Use the SourceRightNow bulk-edit view to apply new rates to all products under an affected HSN prefix at once.
For quotes that extend past the effective date, issue versioned revisions with the new rate.
CBIC publishes rate notifications; the GST portal is where you file returns — subscribe to CBIC circulars for timely notice.

Why GST rate changes break catalogs

Most seller catalogs carry hundreds or thousands of products with an HSN code and a GST rate stamped on each. When the GST Council revises rates — which it does frequently enough that it's a standing operational risk — the rates in your catalog don't update themselves. They sit stale until someone notices.

The noticing usually happens the worst way: a buyer rejects your invoice because the GST you charged doesn't match what their accounts-payable reconciliation expects. Now you have an unpaid invoice, a buyer frustrated with your finance hygiene, and a manual re-invoicing cycle for every recent order under the affected HSN. All avoidable.

The fix is a disciplined 20-minute post-Council workflow. Applied consistently after each meeting, it keeps your catalog clean and your buyer relationships free of this particular source of friction.

What to watch from the GST Council

The cadence matters:

GST Council meeting. Changes are announced in press releases after each Council meeting. Useful for directional signal but not authoritative for compliance.
CBIC rate notification. The Central Board of Indirect Taxes and Customs publishes the actual notification. This is the authoritative document — HSN-level rate changes, effective date, and transitional rules.
Effective date. Usually the 1st of a month, a few weeks after the Council meeting. All invoices issued on or after that date use the new rate.

Subscribe to the CBIC circulars email list or have your CA forward the notification within 48 hours of publication. Don't rely on press coverage — summaries miss the HSN-level detail that affects your specific catalog.

The 20-minute update workflow

Step 1. Pull the latest CBIC notification

Download the PDF from cbic-gst.gov.in . Save it with a clear filename including the notification number and date. This is your source of truth for the audit.

Step 2. Export your catalog with HSN codes

From your SourceRightNow seller dashboard, export the product list including product name, HSN/SAC code, and current GST rate. CSV is easiest for the diff.

Step 3. Diff against the notification

Match every product's HSN code prefix against the changed entries in the notification. Important: match at the chapter (first 2 digits) and heading (first 4 digits) level, not just exact 8-digit matches. Rate changes often apply broadly, and a product you'd swear isn't affected might share a heading with one that is.

Step 4. Bulk-update in your catalog

Use the SourceRightNow bulk-edit view: filter products by affected HSN prefix, apply the new GST rate to the selection, save. For large catalogs this is dramatically faster than per-product edits — and it avoids the "you missed one" problem that per-product editing creates.

Step 5. Handle open quotes

Pull your list of open quotes (status: pending, not yet accepted or expired). For any quote whose validity window extends past the effective date:

If the buyer is likely to issue a PO pre-effective-date: leave the quote as-is.
If the buyer is likely to issue a PO post-effective-date: issue a revised quote (v2) with the new rate and a new validity window, and send a short chat message explaining the revision.
If the quote is already accepted and converted to PO pre-effective-date: the old rate generally applies under time-of-supply rules, but check with your CA for edge cases.

Impact on open quotes

Versioning quotes correctly is the detail that separates a professional revision from a finance-mess-up. The rules:

Never edit a sent quote in place. Always issue v2 with a new quote number and new issue date.
Send a short explanatory chat message."Revising your quote to reflect the CBIC GST rate change effective [date]. Rate moves from X% to Y% on HSN [code]. Revised quote attached." Buyers appreciate the heads-up.
Preserve v1 in your records. SourceRightNow's quote tool does this automatically — critical for audit and any dispute.

A quick HSN/SAC audit

GST rate updates are a good moment to audit HSN accuracy generally. Every two or three cycles, pull a sample of 20 products and cross-check their HSN against the CBIC HSN search . Common errors:

Using a 4-digit HSN when your turnover bracket requires 6 or 8.
Copying HSN from a supplier who classifies their raw material differently than your finished product.
Using an HSN that was deprecated or merged in a past rate revision.
Using the same HSN for products that have materially different tax treatment (e.g. bundled goods).

Compliance traps that show up at invoice time

Old rate on a post-effective-date invoice. Buyer AP rejects. You re-invoice. Avoid: do the catalog update on time.
New rate on a pre-effective-date delivery. Buyer disputes the differential. Avoid: respect time-of- supply rules.
Mixed-rate quote where half the line items have been updated. Confusing to the buyer and a finance-team flag. Avoid: bulk-edit consistently.
Wrong HSN catching a rate change that doesn't apply. Rare but happens. Avoid: audit HSN periodically.

Frequently asked questions

When do GST rate changes take effect?+

The CBIC rate notification specifies an effective date — usually a rounded calendar date (1st of a month) a few weeks after the GST Council meeting. Any invoice issued on or after the effective date uses the new rate, regardless of when the order was placed. Goods delivered / services rendered before the effective date under a contract dated earlier typically continue at the old rate under time-of-supply rules — but always verify against the specific notification.

Do I need to revise quotes that were issued before a rate change?+

If the quote's validity extends past the rate change effective date AND the buyer is likely to issue a PO post-change, yes — issue a versioned revision with the updated rate. If the quote has already been accepted and converted to a PO before the effective date, generally the old rate applies under time-of-supply rules, but you should confirm with your CA for edge cases (advance received, split deliveries, etc.).

What's the difference between HSN and SAC codes?+

HSN (Harmonized System of Nomenclature) codes classify goods; SAC (Services Accounting Code) codes classify services. For most physical-goods sellers, HSN is what you work with. GST rates are published per HSN/SAC line. Rate changes usually apply at a chapter or heading prefix level, which is why an HSN chapter audit catches more products than exact-code matching.

Can I auto-update rates across my SourceRightNow catalog?+

The bulk-edit view in the seller dashboard lets you select all products under an HSN prefix and apply a new rate in one action. For sellers with large catalogs, this is materially faster than per-product edits and avoids missing products that sit under the same HSN chapter.

What if my HSN code is wrong to begin with?+

Then you fix it before the rate change, not during. An incorrect HSN is a compliance risk independent of rate revisions — it can cause input tax credit disputes and classification notices. If you're uncertain, your CA or the CBIC's HSN search tool can resolve it.

Is the GST portal the same as CBIC for rate notifications?+

They publish different documents. The GST portal (gst.gov.in) is where you file returns; CBIC (cbic-gst.gov.in) publishes notifications and circulars. Rate notifications come from CBIC after the GST Council meets. Subscribe to the CBIC circulars email list if you want timely notice.