GST Registration — Post-Registration Compliance Guide
Once your Goods and Services Tax registration is approved in India for the fiscal year 2026, maintaining strict compliance becomes your primary operational priority. Failure to adhere to statutory timelines can result in significant penalties under Section 139 of the CGST Act or even de-registration notices from tax authorities. This guide outlines the mandatory recurring obligations, including monthly and quarterly filings, ensuring your business remains active without regulatory interruption.
Before you start
- Valid GSTIN assigned by the portal
- Access to authorized signatory credentials for e-filing
- Configured accounting software or manual ledger system
Step-by-step
Monthly GSTR-1 Filing (Returns)
File your outward supply details via the GST portal by the 20th day of each subsequent month. This includes all B2B and B2C sales, ensuring accurate invoice number mapping to avoid discrepancies during reconciliation.
Monthly GSTR-3B Filing (Summary)
Submit your summary return detailing total outward supplies, inward purchases, tax liability paid via challan, and ITC availed. The deadline is the 20th of the following month or the last day of the next quarter if you opt for quarterly filing.
Quarterly GSTR-9 Filing (Annual Return)
File your annual return summarizing all transactions from April to March by December 31st of the assessment year. This step is crucial for closing out discrepancies and maintaining a clean audit trail.
Quarterly GSTR-9C Reconciliation
Conduct an internal reconciliation between your books of accounts and filed returns, followed by filing Form GSTR-9C if turnover exceeds the threshold limit. This ensures that tax paid matches liability declared.
Annual ITC Verification (Form GSTR-1B)
File this form to verify Input Tax Credit availed against eligible invoices, ensuring no fraudulent credits are claimed under Section 49 of the CGST Act. This process prevents future disallowance during audits.
Annual GST Return (Form GSTR-1A)
Submit this form to declare any unutilized Input Tax Credit carried forward from previous years, ensuring continuity of credit eligibility for the next financial cycle.
Common mistakes to avoid
- Failing to file GSTR-3B within the deadline even if no supplies were made during the month.
- Mismatching invoice numbers between physical records and digital filings leading to audit queries.
- Ignoring the requirement to reconcile books of accounts with filed returns annually.
Frequently asked questions
What happens if I miss a GSTR-3B filing deadline?
You will incur late fees under Section 47, calculated at ₹50 per day for the first two months and ₹200 thereafter. Additionally, you may face interest charges on unpaid tax liability.
Can I file GSTR-3B if there are no supplies in a month?
Yes, filing is mandatory even for nil returns to maintain your GSTIN active status and avoid de-registration notices from the jurisdictional officer.
Is quarterly filing an option for all businesses?
Quarterly filing applies only if you are a casual taxable person or have opted specifically under Section 43(1) of CGST Act, subject to specific conditions and approval from the proper officer.
How do I handle late payment penalties?
You must pay the outstanding tax along with applicable interest (Section 50) before filing your return. Late fees are calculated automatically by the portal upon submission of nil or partial returns.
Prefer we handle GST Registration (Regular, Casual & Non-Resident Taxable Persons)?
Our team in India & UAE completes every step above for clients daily — accurately and on time.