GST 2.0 for Small Businesses: The 5%, 18% and 40% Slab Reset and Your FY 2026-27 Checklist

The biggest GST overhaul since 2017 has already landed. The 56th GST Council collapsed the old four-slab system into two main rates — 5% and 18% — scrapping 12% and 28%, with a special 40% rate reserved for sin and luxury goods. The revised rates took effect 22 September 2025 (ClearTax, 2025). For a small business, "GST 2.0" is not just cheaper toothpaste — it changes your pricing, your ITC maths, and your FY 2026-27 invoice housekeeping.

What are the GST slabs now after the September 2025 reform?

Effectively three tiers. Most goods and services sit at 5% (essentials) or 18% (standard). The old 12% and 28% slabs were scrapped, and a special 40% rate applies to sin and luxury goods — pan masala, gutkha, aerated and caffeinated drinks, luxury vehicles — with compensation cess merged into that rate except for tobacco and pan masala (SCC Online, 2025). A few niche rates such as 3% on gold and 0.25% on rough diamonds continue.

Daily-use items moved sharply down. Hair oil, shampoo, toothpaste, toilet soap bars, toothbrushes and shaving cream were cut from 18% to 5%, and individual health and life insurance was exempted (ClearTax, 2025). If you trade in these categories, your output price and your input costs both shifted in September 2025.

My product moved from 12% to 5%. Do I reverse my old input tax credit?

Not automatically. A rate reduction is different from an exemption. ITC reversal is generally examined only where a supply becomes fully exempt. If your product stays taxable at a lower rate, the credit you already availed does not lapse — though you will accumulate less ITC on future purchases at the lower rate. The IMS now even lets recipients mark credit notes as "Pending" for one tax period, so you declare the exact ITC to reverse on acceptance rather than facing automatic full reversal (CashFlo, 2025).

Your FY 2026-27 GST housekeeping checklist

• Reset your invoice series from 1 April: Rule 46 of the CGST Rules requires a fresh, unique series each financial year — INV/25-26/1500 becomes INV/26-27/0001. Failure can block e-way bills, GSTR-1 filing, and refunds (IRIS GST, 2026).
• Re-map your HSN to the new rates: update your billing software so the September 2025 slabs flow through correctly on every invoice.
• Reconcile ITC against GSTR-2B: the portal hard-locks credit beyond what GSTR-2B reflects, so match every claim.
• Check e-invoicing applicability: mandatory if aggregate annual turnover crossed ₹5 crore in any FY since 2017-18, assessed PAN-wide; above ₹10 crore you must report invoices to the IRP within 30 days (Tally Solutions, 2025).

For the year-start ritual in detail, see our first 30 days after GST registration checklist, and for the wider rate picture, our GST changes 2026 news roundup.

Frequently Asked Questions

Which GST slabs exist now after the September 2025 reform?

Effectively three tiers. Most goods and services sit at 5% (essentials) or 18% (standard), the old 12% and 28% slabs were scrapped, and a special 40% rate applies to sin and luxury goods like pan masala, aerated drinks and luxury vehicles. A few niche rates such as 3% on gold continue.

My product moved to a lower slab. Must I reverse input tax credit?

Not automatically. A rate reduction is not an exemption, and ITC reversal is generally examined only when a supply becomes fully exempt. If your product stays taxable at a lower rate, the credit you availed does not lapse — though you will earn less ITC on future purchases at the lower rate.

Do I need to reset my invoice numbers for FY 2026-27?

Yes. Under Rule 46 of the CGST Rules, every registered business must begin a new, unique invoice series each financial year from 1 April. Skipping this can cause problems generating e-way bills, filing GSTR-1, or claiming refunds, and may invalidate e-invoice IRNs.

Is e-invoicing mandatory for my small business?

If your aggregate annual turnover crossed ₹5 crore in any financial year since 2017-18, e-invoicing is mandatory and assessed PAN-wide across all your GSTINs. Once you cross the threshold there is no exit, even if turnover later falls. Businesses above ₹10 crore must report invoices to the IRP within 30 days.

What should you do next?

Audit your HSN-to-rate mapping this week, reset your invoice series for the new financial year, and reconcile ITC against GSTR-2B before your next return. For help, see Bizeract monthly GST return filing, e-invoice registration, and our full finance and compliance services.