Pharmacy GST billing: GSTR-1, GSTR-3B and HSN explained in plain language

GST filing becomes stressful when the bills are not clean. If every bill already carries the right information, the monthly return is mostly a matter of adding things up. This article explains what the main returns contain, so you know what your billing must capture. Always confirm rates and due dates with your accountant and the GST portal, because they change.

What GST needs from every sale

• The GST rate of each product. Different medicines can have different rates, and the rate can change. Keep it on the product, and do not retype it on each bill.
• The HSN code of each product. This is the classification code used in your GST summary.
• The customer's GSTIN, if the customer is a business. A sale to a GST-registered buyer is a B2B sale and is reported with that GSTIN. A sale to an ordinary customer is B2C.
• The invoice number and date, in a continuous series.

GSTR-1: what you sold

GSTR-1 is the statement of your sales (outward supplies). In simple terms it lists:

• B2B sales: invoice by invoice, with the buyer's GSTIN.
• B2C sales: usually summed up by tax rate.
• Credit notes: sales returns that reduce your sales.
• HSN summary: your sales grouped by HSN code, with quantity and value.

GSTR-3B: what you owe

GSTR-3B is the summary return in which you pay the tax. It brings together:

1. The tax on your sales for the month.
2. The input tax credit (ITC) you can claim on your purchases.
3. The tax you actually pay: sales tax minus the input credit.

This is why purchase invoices matter. If a purchase bill is missing or wrong, you may lose input credit.

Returns and credit notes

When a customer returns medicine, record a sales return so that a credit note is created. It reduces your sales and your tax. In the same way, when you return stock to a supplier, record a purchase return so that a debit note is created and your input credit adjusts.

What makes filing easier

• Fix the GST rate and HSN once on each product.
• Never delete a bill. Cancel it, so the number series stays complete.
• Record purchases the day they arrive, with the supplier's invoice number.
• Keep your GST report open on the same day each month and compare it with your books before filing.

MedSync has a GST page with GSTR-1 sections (B2B, B2C and credit notes), a GSTR-3B summary and an HSN summary, and each can be exported to Excel. There is also one accountant export with the registers and notes together. It does not file the return for you: your accountant still files it on the portal.