The GST portal is experiencing significant technical issues on Monday, April 20, 2026 — the deadline day for filing GSTR-3B for the March 2026 tax period — leaving thousands of taxpayers and chartered accountants unable to complete their returns with the clock running out. A large number of CAs across India have raised the alarm and are demanding an official extension of the deadline from the government.
If you are trying to file your GSTR-3B today and the portal is throwing errors, throwing blank screens or simply not loading, you are not alone. The problem appears to be widespread and has been building for the past couple of days.
What Is Happening on the GST Portal
Gujarat-based Chartered Accountant Deep Koradia told ET Wealth Online that many taxpayers and tax professionals have been experiencing slow response from the GST portal since the past couple of days ahead of the March 2026 GSTR-3B filing deadline. On deadline day itself, the issues have become acute with users reporting outright inability to file.
The error messages being reported by affected users include server errors indicating the system is unable to fetch data from the backend application, data corruption errors during transmission from browser to the GST system, and network connectivity interruption messages between the user’s system and the GST server. These are server-side failures rather than user-side errors — meaning the problem is with the GST portal’s infrastructure, not with individual taxpayers’ computers or internet connections.
What Is GSTR-3B and Why April 20 Matters
GSTR-3B is a simplified summary return that taxpayers file to report their GST liabilities for a specific tax period and discharge those liabilities. It is one of the most important compliance filings in the GST ecosystem — monthly filers are required to submit it for every tax period without exception. The due date for monthly filers is the 20th day of the month following the tax period, which makes April 20 the statutory deadline for the March 2026 return.
Missing the GSTR-3B deadline carries consequences. Late filing attracts a late fee of ₹50 per day for returns with tax liability and ₹20 per day for nil returns, subject to a maximum cap. More significantly for businesses with regular compliance obligations, a late GSTR-3B can create downstream complications for input tax credit claims and reconciliation with GSTR-2B data.
When the portal itself is down on the deadline day through no fault of the taxpayer, the demand for an extension is not merely a convenience request — it is a matter of basic fairness. Taxpayers cannot be penalised for a government portal’s technical failure.
What CAs Are Demanding
The chartered accountant community, which manages GST compliance for the majority of India’s registered taxpayers, is collectively demanding that the government extend the GSTR-3B deadline for March 2026 given the documented portal issues. The precedent for such extensions exists — the government has previously issued notifications extending GSTR-3B deadlines during technical disruptions and during events such as natural calamities and the COVID-19 pandemic.
The government has the power to extend the due date for filing GSTR-3B through official notification. Whether GSTN or the Ministry of Finance will respond to today’s widespread filing failure with an extension announcement remains to be seen. Given the volume of complaints and the visibility of the issue among the CA community — which has organised social media campaigns and official representations on such issues in the past — an official response is likely to be forthcoming if the portal does not stabilise quickly.
What to Do If You Cannot File Today
If the portal is returning errors, document your attempts with screenshots including timestamps — these serve as evidence that you attempted to file within the deadline period in case a penalty dispute arises later. Keep the screenshot showing the specific error message received.
Try filing at off-peak hours — early morning or late night access often has better server response than mid-day and evening windows when simultaneous user load is highest. Try different browsers — Chrome, Firefox and Edge can behave differently depending on the specific error type. Clear your browser cache and cookies before attempting again.
Monitor the official GST portal’s Twitter handle and the GSTN website for any official communication about the technical issues or an extension announcement. The CA associations — including ICAI — typically circulate official extension notifications rapidly when they are issued.
Business Upturn will update this report if the government announces an extension of the GSTR-3B deadline.
Disclaimer: This article is for informational purposes only and does not constitute tax or legal advice. Readers are advised to consult their chartered accountant or tax advisor for guidance specific to their filing obligations.