GSTR-2B reconciliation for pharmacies and optical shops

A pharmacy or optical shop pays GST on almost everything it buys and collects GST on almost everything it sells. The difference is the input tax credit, and for a business on thin margins it is real money. But the credit is not yours because you hold a purchase invoice. It is yours when your supplier has reported that invoice and it shows up in your GSTR-2B.

This guide is for owners, pharmacists in charge and accountants of pharmacies, optical shops and labs registered under GST, including those that sit inside a clinic or hospital. It covers what GSTR-2B is, how to reconcile against it every month, the mismatches pharmacies and optical shops see most, and a routine that keeps the credit you can defend.

Who needs to do this

• A pharmacy, optical shop or lab with its own GSTIN that makes taxable sales: yes, every month.
• A clinic or hospital that only provides health care services: usually not. Health care services by a clinical establishment or an authorised medical practitioner are exempt from GST, and credit is not available on inputs used for exempt services. If the same business also runs a taxable pharmacy or optical counter, the credit question applies to that part. Your CA should confirm how your registrations are set up.
• A composition dealer: no. A composition dealer cannot claim input tax credit at all.

What GSTR-2B is

GSTR-2B is a monthly statement the GST portal builds for you. It lists the invoices, debit notes and credit notes your suppliers reported in their own returns, with the credit each one makes available to you. A draft is generated on the 14th of the following month; if you file quarterly, you get one for the quarter on the 14th of the month after it.

Three things to know about how it is built:

• It depends on your supplier’s filing. A distributor that files quarterly reports three months of invoices at once, so their invoices may appear in your GSTR-2B later than you expect.
• You act on invoices in the Invoice Management System (IMS). Since October 2024, every invoice a supplier reports appears in IMS, where you can accept it, reject it or keep it pending. An invoice you do nothing about is treated as accepted when GSTR-2B is generated.
• You can change your mind until you file GSTR-3B. If you accept, reject or hold an invoice after the 14th, recompute GSTR-2B before filing. Rejecting an invoice for goods you never received, or holding a disputed one, is far easier before the return than after it.

The rule that makes reconciliation necessary

Section 16(2)(aa) of the CGST Act allows credit only on invoices that the supplier has reported and that appear in your GSTR-2B. If you claim credit on an invoice that is not there, the claim can be reversed with interest. If you never notice an invoice is missing, you lose the credit when the time limit passes: credit for a financial year can be claimed only up to 30 November of the following year, or the date you file the annual return, whichever is earlier.

So the job each month is simple to state: compare your purchase register with GSTR-2B, claim what matches, and chase what does not.

How to reconcile, step by step

1. Start from your goods received, not from a pile of invoices. Your purchase register should come from the GRNs you recorded: supplier GSTIN, invoice number, invoice date, taxable value, and CGST, SGST or IGST for each invoice. If GRNs are recorded on the day goods arrive, the register is ready when GSTR-2B is.
2. Download GSTR-2B for the month from the portal.
3. Match supplier by supplier. Match each invoice on the supplier’s GSTIN first, then the invoice number and date, then the taxable value and each tax head separately. Matching on the total tax alone hides the commonest error.
4. Sort what is left into buckets (below) and decide each one.
5. Claim the credit that matched, defer the rest, and record why each deferred invoice was deferred.
6. Follow up with each supplier whose invoices are missing or wrong, and check the next month’s GSTR-2B for them.

The mismatches you will see, and what to do

What you see	Usual cause	What to do
In your books, not in GSTR-2B	The supplier has not filed yet, files quarterly, or reported it under another GSTIN	Defer the credit. Ask the supplier to report it. Claim it in the month it appears.
In GSTR-2B, not in your books	Goods received but no GRN recorded, an invoice billed to you by mistake, or another branch’s purchase	Check the stores. Record the GRN if the goods came. Reject it on the portal if they did not.
Tax head differs	IGST reported instead of CGST and SGST, or the other way round	The supplier corrects their return. The total can match while the credit is still wrong.
Taxable value differs	A scheme discount, a rate change, a typing error, or a part delivery	Compare with the invoice and the GRN. A credit note may be due.
Invoice number differs slightly	Leading zeros, prefixes or a missing slash	Match by value and date, then correct your record so it matches next time.
Appears twice	The same invoice recorded on two GRNs	Remove the duplicate from your books before you claim.
Tax rate looks wrong	A supplier still billing a rate that changed on 22 September 2025	Since then most medicines, spectacle lenses, frames, corrective spectacles and contact lenses carry 5% GST. Ask the supplier for a corrected invoice.

Two cases need care in pharmacies especially:

• Free goods and schemes. A “10 plus 1” scheme or a trade discount changes what the invoice says and what you received. Record free quantity on the GRN separately from billed quantity, so the stock is right and the value matches the invoice.
• Expiry and breakage returns. Goods sent back to a distributor are usually settled with a credit note from them. That credit note reduces your credit when it appears in GSTR-2B, so it should be recorded in your books too.

A monthly routine that holds up

• Every day: record GRNs as goods arrive, with the supplier invoice attached and the batch and expiry on every line.
• From the 14th, once GSTR-2B is generated: run the match, accept, reject or hold invoices in IMS, and message suppliers about anything missing.
• Before filing GSTR-3B (the 20th for monthly filers; the 22nd of the month after the quarter for quarterly filers in Tamil Nadu and other states in the same group, the 24th elsewhere): claim the matched credit, carry deferred invoices forward on a list, and lock the month in your books once filed.
• Every quarter: chase deferred invoices older than three months, because the 30 November deadline comes round faster than expected.
• Before the annual return: reconcile the year’s credit claimed with the year’s GSTR-2B statements.

The tax and compliance calendar lists the monthly due dates.

Where 92health fits

In 92health, the purchase register is the goods received themselves: a pharmacy or optical shop records each GRN against its purchase order and the supplier’s invoice, and the GST on each line is recorded as it is entered. From there:

• the month’s GSTR-2B file is uploaded and matched against the GRNs, supplier by supplier;
• invoices that match exactly are cleared, small differences are matched within a tolerance, and close but uncertain matches are left for a person to confirm, never guessed;
• each tax head is compared separately, so an IGST-for-CGST error shows even when the total agrees;
• an invoice missing from GSTR-2B defaults to deferred, not claimed, and an invoice GSTR-2B marks as not eligible is held back with the portal’s reason;
• purchases with no supplier GSTIN are shown separately with their value, so the gap is visible rather than counted as a mismatch;
• the GSTR-3B summary and export follow from the matched credit, and your CA can see the same screens, with your consent.

If you run a pharmacy or optical shop in Tamil Nadu, Andhra Pradesh or anywhere else in India and would like to see it on your own month, book a demo.

Sources

• Central Goods and Services Tax Act, 2017, sections 10(4), 16(2)(aa) and 16(4), and CGST Rules, 2017, rule 36(4).
• Notification 12/2017-Central Tax (Rate), entry 74 (health care services by a clinical establishment or an authorised medical practitioner).
• Notification 9/2025-Central Tax (Rate), 17 September 2025, and the GST Council’s press release on the rate changes from 22 September 2025.
• GSTN, frequently asked questions on the Invoice Management System, and the GST portal user guides for GSTR-1, GSTR-2B and GSTR-3B.