How to File GSTR-1 for a Pharmacy: Complete Step-by-Step Guide (2026)

If you run a medical shop in India, GSTR-1 is the return that consumes the most hours and generates the most anxiety. Retail chemists issue hundreds of small invoices a month, and one wrong sheet total can trigger a notice months later. This guide walks through the complete monthly routine, from daily invoice capture to the final filing on the GST portal — updated for the GST 2.0 rates and the 2025 return changes.

What Changed in 2025–26

• GST 2.0 rates (from 22 September 2025): the 12% slab was removed. Most medicines and formulations moved from 12% to 5%, and 36 life-saving drugs became nil-rated. Pharmacies now report at 0%, 5% and 18%.
• HSN summary (Table 12): since 2025 the portal splits the HSN summary into separate B2B and B2C tabs, and HSN codes must be picked from the portal's list rather than typed.
• GSTR-1A: lets you correct a filed GSTR-1 for the same period before you file GSTR-3B.

Why Pharmacy GSTR-1 Filing Goes Wrong

Pharmacy outward supplies have three quirks that generic accounting workflows handle badly:

• Rate mix. A single bill can carry nil-rated, 5% and 18% items, and each rate must be reported separately by HSN. Items still sitting at the old 12% rate are now simply wrong.
• Document continuity. Cancelled invoices and credit notes must appear in the document sequence summary — gaps invite queries.
• Exempt supplies. Chemists attached to hospitals also handle exempt healthcare services (SAC 999316), which belong in the exemp schedule, not in taxable turnover.

Manual filing means re-typing invoice data into spreadsheets at month end — and that is where errors creep in.

The Documents You Need Before Filing

• All sales invoices for the period, with serial-number continuity.
• Credit notes and debit notes issued (sales returns).
• Cancelled invoice register.
• HSN-wise summary of outward supplies.
• Separate list of exempt/nil-rated supplies.

Step-by-Step: Filing GSTR-1 with the Excel Export

1. Close your month. Run the Z-Report for the last day and ensure all invoices are finalized and reprints are accounted for.
2. Open GST → GSTR-1 Export in PharmaBill and select the return period.
3. Review the sheet summary. The screen shows counts and totals per sheet — check doc for invoice-number continuity.
4. Download the workbook. One click produces the multi-sheet .xlsx in the exact format the GSTN Returns Offline Tool imports.
5. Import it into the Returns Offline Tool. The tool validates each sheet; fix any error in PharmaBill (not in the tool) and export again.
6. Generate the JSON and upload it on the GST portal (Returns Dashboard → GSTR-1 → Prepare Offline → Upload).
7. Preview, submit and file with EVC or DSC. Download the filing acknowledgement for your records.

Export → Offline Tool → Upload → File. No re-typing at any step.

Due Dates

• Monthly filers: GSTR-1 by the 11th of the next month.
• QRMP scheme (aggregate turnover up to ₹5 crore, if opted): GSTR-1 quarterly by the 13th of the month after the quarter, with the optional Invoice Furnishing Facility (IFF) for B2B invoices in the first two months.
• Check the GST portal for any extension notified for a particular month.

Understanding Each Sheet

Common Mistakes and Notices to Avoid

• Broken invoice numbering. The doc sheet exposes gaps instantly — keep numbering machine-sequential.
• Mixing exempt and taxable turnover. Consultation and diagnostic exemptions do not belong in b2cs.
• Ignoring credit notes. Returns without credit notes overstate turnover and over-pay tax.
• HSN mismatch. Wrong HSN on the item master flows straight into the hsn sheet. Fix masters, not sheets.
• Old 12% rates. Any item still at 12% after 22 September 2025 produces a rate that no longer exists. Update the master in one pass (HSN Bulk Update in PharmaBill).

Month-End GSTR-1 Checklist for a Medical Shop

1. Day 1–2 of the new month: finish entering last month’s returns as credit notes and cancel (don’t delete) wrong bills.
2. Check rates: no item should still carry 12%; nil-rated life-saving drugs should show 0%.
3. Check B2B buyers: every clinic or hospital you billed on GSTIN must have a valid GSTIN on the invoice.
4. Check numbering: the doc sheet should show one continuous series per invoice type, with cancellations counted.
5. Export and file by the 11th, then download the acknowledgement and keep it with your monthly records.
6. Share the same numbers with your CA for GSTR-3B, so both returns agree on turnover.

Doing these six steps every month takes about 20 minutes once your software produces the workbook for you — and it removes the most common reasons pharmacies receive GST notices.

FAQ

• Can I file GSTR-1 without an accountant? Many owners do — once the workbook is clean, the portal steps take a few minutes. Keep your CA in the loop for GSTR-3B and annual returns.
• I made a mistake in a filed GSTR-1 — what now? Correct it in GSTR-1A for the same period before filing GSTR-3B, or amend it in a later GSTR-1.
• What about GSTR-3B? The ITC register and GST summary report give your accountant the input-side numbers.
• Does this work offline? Yes. The export runs on your local database; only the portal upload needs internet.

About the Author

Related Articles