GST Frequently Asked Questions (FAQ) – 2026 Edition

The GST regime in India has evolved into a "Technology-First" tax system. With the recent 2026 updates, compliance has become more automated and stricter. At Sagar S Gupta & Co, we help businesses stay ahead of these changes.

Below are the most critical questions regarding GST compliance today.

1. What is the current GST registration threshold in 2026?

Registration is mandatory based on your aggregate annual turnover (AATO):

• For Goods: ₹40 Lakhs (Normal States) / ₹20 Lakhs (Special Category States).
• For Services: ₹20 Lakhs (Normal States) / ₹10 Lakhs (Special Category States).
• Mandatory Registration: Regardless of turnover, you must register if you engage in inter-state sales, sell via e-commerce (TCS), or are a non-resident taxable person.

2. What is the new "3-Year Time Bar" on GST returns?

Effective from the July 2025 tax period, taxpayers can no longer file their GST returns (GSTR-1, GSTR-3B, etc.) after the expiry of three years from the original due date. This means "legacy" pending returns can no longer be cleared after this window, potentially leading to permanent loss of Input Tax Credit (ITC) and cancellation of registration.

3. How has the GSTR-3B filing changed in early 2026?

The GST portal now features "Hard-Locked" auto-population. Your tax liability is automatically pulled from GSTR-1, and your ITC is pulled from GSTR-2B.

• Interest Calculation: Starting January 2026, the portal auto-calculates interest on delayed payments by giving credit for the minimum cash balance available in your Electronic Cash Ledger (ECL).
• Tax Liability Breakup: You must now provide a period-wise breakup if you are paying tax for previous months in the current return.

4. Can I claim Input Tax Credit (ITC) if my supplier hasn't filed their return?

No. Under the "No GSTR-2B, No ITC" rule, you can only claim credit for invoices that appear in your GSTR-2B. If your supplier fails to file their GSTR-1, the credit will not reflect, and you cannot claim it. We recommend regular vendor reconciliation to avoid cash flow disruptions.

5. What is the new "30-Day Rule" for E-Invoicing?

For businesses with an AATO above ₹10 Crore, the Invoice Reference Number (IRN) must be generated within 30 days of the invoice date. Failing to do so makes the invoice legally invalid for GST purposes, and your customer will be unable to claim ITC.

6. Why is my GST registration "Suspended" automatically?

In 2026, the GSTN portal performs automated profile checks. Your registration may be suspended without prior notice if:

• You have not updated or verified your Bank Account details.
• There is a significant mismatch between your GSTR-1 and GSTR-3B.
• You have failed to file returns for two consecutive periods.

7. What are the current GST Slabs in 2026?

While the structure remains dynamic, the primary slabs are:

• 0%: Essential food, healthcare, and education.
• 5%: Common consumer items (including recent reductions on cancer drugs and certain food items).
• 18%: Standard rate for most goods and services.
• 40%: "Sin" or luxury goods (including high-capacity motorcycles and tobacco products).