Five operational GST changes took effect on April 1, 2026. Together, they represent what practitioners are calling "GST 2.0": a shift from self-reported compliance to system-enforced validation.
Each change affects a different set of businesses. Here is what each one means and whether it applies to you.
1. Aadhaar Authentication for Refunds and Revocation
Aadhaar authentication is now mandatory for two critical GST processes:
GST Refund Claims (Form RFD-01)
When filing a GST refund application, the authorized signatory must complete Aadhaar authentication on the GST portal. Without it, the refund application will not be accepted.
This affects:
- Exporters claiming IGST refund on exports
- Businesses claiming refund on inverted duty structure
- Any taxpayer filing RFD-01 for excess cash balance refund
Registration Revocation (Form REG-21)
If your GST registration was cancelled by the department and you want to revoke the cancellation, Aadhaar authentication is now required for the application.
How to Complete Aadhaar Authentication
- Log in to the GST portal
- Navigate to My Profile
- Click on "Aadhaar Authentication"
- Enter the Aadhaar number of the authorized signatory (must match the GST registration)
- Complete OTP verification on the Aadhaar-linked mobile number
- Authentication status will show as "Authenticated"
What If Aadhaar Is Not Linked?
If the authorized signatory's Aadhaar is not linked to the GST registration:
- Add Aadhaar through the registration amendment process first
- Complete authentication after the amendment is approved
- Until authentication is done, refund claims and revocation applications cannot be filed
2. Hard ITC Validation: Filing Block
The most impactful change for daily operations. The GST portal now performs a real-time check before accepting GSTR ThreeB submission:
- If ITC claimed in GSTR ThreeB exceeds ITC available in GSTR TwoB, submission is rejected
- This is a hard block, not a soft warning
- Previously, the system issued DRC-01C notices after filing. Now it prevents filing entirely.
Who Is Affected
Every regular GST taxpayer who files GSTR ThreeB. This is not limited to large businesses. Even a small trader with Rs 10 lakh turnover faces the same validation.
What to Do
- Review GSTR TwoB on the 14th of every month
- Match your ITC figures against GSTR TwoB before preparing GSTR ThreeB
- If your books show higher ITC, reduce the GSTR ThreeB claim to match GSTR TwoB
- Track the difference and claim it in future periods
This change makes monthly GSTR TwoB reconciliation a mandatory pre-filing step, not an optional best practice.
3. Intermediary Services Reclassified as Exports
This is significant positive news for IT/ITES, BPO, and outsourcing companies.
What Changed
Previously, intermediary services (arranging or facilitating supplies between two parties) were treated as domestic supply even when the client was outside India. This meant paying full IGST with no export benefit.
From April 1, 2026, intermediary services provided to clients outside India are classified as exports of services. This means:
- Zero-rated supply treatment
- Option to supply under LUT (without paying IGST) and claim refund of ITC
- Or pay IGST and claim refund
Who Benefits
- IT companies providing SaaS implementation services to foreign clients
- BPO companies facilitating transactions for overseas businesses
- Consulting firms arranging or intermediating between Indian and foreign entities
- Recruitment agencies placing candidates for overseas employers
- Digital marketing agencies managing campaigns for foreign clients
What to Do
- Review your service agreements with foreign clients
- Determine if any services qualify as intermediary services under the reclassification
- If eligible, file LUT for FY 2026-27 to export without paying IGST
- Apply for refund of accumulated ITC on inputs used for these services
- Update your GST return filing to reflect the reclassification
4. Post-Sale Discount ITC Reversal Rules
When a supplier offers a post-sale discount (through a credit note), the buyer must now reverse ITC proportional to the discount.
How It Works
If you received a Rs 1,00,000 invoice with Rs 18,000 GST and claimed the full ITC, and the supplier later issues a Rs 10,000 credit note 10% discount), you must reverse Rs 1,800 ITC 10% of the original GST).
What Changed
The rules for when and how this reversal must be done have been clarified:
- Reversal must happen in the GSTR ThreeB of the period in which the credit note is received
- If the credit note appears in IMS, accepting it automatically adjusts your GSTR TwoB
- If you do not reverse, the mismatch will trigger the hard ITC validation block
What to Do
- Process supplier credit notes promptly in your books
- Accept credit notes in IMS when they appear
- Ensure your GSTR ThreeB reflects the reduced ITC after discounts
- Train your accounts team to link credit notes to original invoices for accurate reversal
5. Green Track Exporters: 90% Refund in 7 Days
Exporters classified under the "Green Track" category now receive 90% of their GST refund within 7 days of filing the application.
Eligibility for Green Track
- Consistent filing history (all returns filed on time for at least 2 years)
- No pending demand or investigation
- Clean compliance record with no adverse history
- Turnover above a specified threshold (varies by category)
- Aadhaar authentication completed
How It Works
- File refund application (RFD-01)
- System automatically checks Green Track eligibility
- If eligible, 90% of the claimed amount is disbursed within 7 days
- Remaining 10% is released after verification (standard timeline)
What to Do
- Check your eligibility status on the GST portal
- Ensure all returns are filed on time (any late filing disqualifies you)
- Complete Aadhaar authentication (mandatory for refund claims)
- File refund claims promptly after each export shipment
Impact Summary by Business Type
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