How to File GSTR-1 in 5 Minutes Using Reserve

What is GSTR-1?

GSTR-1 is a monthly or quarterly return that every registered GST taxpayer in India must file. It contains details of all outward supplies — basically, every sale you made during the period. The filing deadline is the 11th of the following month for monthly filers, or the last date of the month following the quarter for QRMP scheme users.

Getting this wrong means notices from the GST department, ITC mismatches for your buyers, and unnecessary stress. The good news? If you use Reserve, most of the work is already done.

What Reserve Auto-Collects for GSTR-1

Every time you create an invoice in Reserve, the app automatically captures and categorises the data needed for GSTR-1:

• B2B supplies — invoices to registered buyers (with GSTIN), broken down by tax rate
• B2CL supplies — invoices above ₹2.5 lakh to unregistered buyers in other states
• B2CS supplies — all other sales to unregistered buyers, summarised by state and rate
• HSN Summary — quantity, taxable value, and tax collected per HSN/SAC code

Step-by-Step: Export GSTR-1 from Reserve

1. Open Reserve and go to Reports from the sidebar
2. Find the GST & Compliance section
3. Click GSTR-1 and set your filing period (month or quarter)
4. Hit Export Excel — Reserve generates a multi-sheet workbook with B2B, B2CL, B2CS, and HSN Summary tabs
5. Save the file and open it to review your data

Uploading to the GST Portal

The GST portal accepts data via the offline tool or direct entry. With Reserve's export:

• Download the GSTR-1 Offline Tool from the GST portal
• Import your Reserve Excel file into the offline tool (the column format matches)
• Validate, generate the JSON file, and upload it on the portal
• Review the summary on the portal and file your return

Tips for Accurate Filing

• Check HSN codes — incorrect codes lead to mismatches during annual reconciliation (GSTR-9)
• Verify GSTINs — Reserve validates format, but always confirm with buyers if unsure
• Set your Company State — this determines CGST+SGST vs IGST split. Go to Settings → Company Details
• File on time — late filing attracts ₹50/day (₹20 for nil returns) plus interest