How to Get GSTR-1 & GSTR-3B Monthly Filing in India
Navigating the Goods and Services Tax regime in India requires precision. The monthly filing cycle involves submitting GSTR-1 for outward supplies and GSTR-3B to declare tax liability and pay dues. Missing deadlines can attract significant penalties under Section 47 of the CGST Act, making timely compliance critical for business continuity. This guide outlines a streamlined process tailored for Indian entrepreneurs in 2026. We cover everything from accessing the GST Portal (gst.gov.in) to reconciling Input Tax Credit and generating challans via the Common Processing Module (CPM). By following these steps, you can avoid mismatches between returns that often trigger notices. Our approach emphasizes accuracy over speed, ensuring your ledger entries align perfectly with statutory requirements. Whether you are a regular taxpayer or transitioning from quarterly filing to monthly compliance under new thresholds, this resource provides the exact roadmap needed for smooth financial operations.
Before you start
- Active GSTIN registered on the official portal (gst.gov.in)
- Digital Signature Certificate (DSC) or EVC enabled Aadhaar for authorized signatories
- Access to accounting software with updated ledger and invoice data
Step-by-step
Step 1: Access the GST Portal & Verify Login Credentials
Log in to your registered account on gst.gov.in using your DSC or EVC-enabled Aadhaar. Ensure that all user roles (like Authorized Signatory) are active and have valid credentials before attempting any filing.
Step 2: File GSTR-1 for Outward Supplies
Navigate to the 'Returns' menu, select your state code, choose GSTR-1, and click on 'New Return'. Enter details of all outward supplies made during the tax period. Ensure HSN codes are accurate as per 2026 classification rules.
Step 3: Reconcile Input Tax Credit (ITC)
Before filing GSTR-3B, verify your ITC ledger to ensure it matches the credit claimed in GSTR-1. Resolve any mismatches between supplier and recipient returns to prevent disallowance of credits during audits.
Step 4: File GSTR-3B for Tax Liability
Proceed to file GSTR-3B, summarizing the tax payable on outward supplies. Declare eligible ITC availed and calculate net tax liability after deducting input credit from output tax.
Step 5: Generate Challan for Payment
Once liabilities are declared in GSTR-3B, generate the payment challan via CPM. Pay the dues using NEFT/RTGS or UPI before midnight of the due date to avoid late fees.
Step 6: Verify Acknowledgement Number
After successful submission and payment, download the acknowledgement number (ARN) for both GSTR-1 and GSTR-3B. Save these records securely as proof of timely compliance.
Common mistakes to avoid
- Filing without reconciling ITC ledgers leads to credit disallowance.
- Submitting returns after the midnight deadline attracts late fees under Section 47.
- Using outdated HSN codes or incorrect state jurisdiction in GSTR-1.
Frequently asked questions
What is the due date for monthly GST filing?
GSTR-3B must be filed by the 20th of the following month, while GSTR-1 typically has a deadline on the 11th or 15th depending on your turnover category.
Can I file monthly returns if my business is small?
Yes. If you are not eligible for quarterly filing under Section 43(6), mandatory monthly compliance applies to all registered taxpayers regardless of size in 2026.
What happens if I miss the GSTR-1 deadline?
Late fees start at ₹50 per day for late filing, up to a maximum limit defined by current rules. Interest may also accrue on unpaid tax from the due date.
How do I correct errors in GSTR-1?
You can file Form GST DRC-03 for late corrections or use the 'Edit' feature within 24 hours of filing if supported by your portal version. For major changes, a fresh return is often required.
Is GSTR-1 mandatory for all taxpayers?
Yes, unless you are an unregistered supplier or fall under specific exemptions like composition dealers who file different forms instead of monthly returns.
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