How to Reconcile GSTR-2B, Step by Step

Why reconciliation matters

Since 2022 you can claim input tax credit only for invoices that show up in GSTR-2B. If you claim more than 2B supports, you will get a notice (often DRC-01C) and may pay the excess back with 18% interest. If you claim less, you lose working capital. A monthly reconciliation protects both.

The 8-step method

1. Download GSTR-2B. On the GST portal go to Returns Dashboard → select the period → GSTR-2B → Download (Excel). It is generated on the 14th of the following month.
2. Export your purchase register. From your accounting software, export all purchase invoices for the same period with supplier GSTIN, invoice number, date, taxable value and IGST/CGST/SGST.
3. Normalise the data. Upper-case GSTINs, strip spaces and special characters from invoice numbers, and use one date format. Most mismatches are formatting, not real differences.
4. Match on GSTIN + invoice number. Use supplier GSTIN and the cleaned invoice number as the key. Then compare taxable value and tax amounts, allowing a small tolerance (for example ₹1) for rounding.
5. Sort into four buckets. Matched; in books but not in 2B; in 2B but not in books; and matched with a value difference.
6. Act on each bucket. Claim matched ITC. Follow up with suppliers for invoices missing from 2B. Record or reject invoices in 2B you haven't booked. Correct value differences with the supplier or in your books.
7. Review ineligible credit. Remove blocked credit under Section 17(5) and check the ITC-not-available section of 2B.
8. File GSTR-3B. Claim ITC as per your reconciled figure, which should not exceed what 2B supports, and keep your working file for audit.

The four buckets

Common causes of mismatch

• Invoice number typed differently (“INV/001” vs “INV-1”).
• Supplier reported the invoice in a different month.
• Wrong GSTIN — often a branch GSTIN of the same supplier.
• Supplier reported a B2B invoice as B2C.
• Credit notes not reported, or reported late.
• Import of goods (IGST on imports) appears in a separate section.

Tips from practice

• Reconcile on the 14th, as soon as 2B is generated, so suppliers have time to fix their GSTR-1 before your 3B is due.
• Keep a running list of suppliers who repeatedly file late, and hold payment until they file.
• For QRMP suppliers, ask them to use IFF so invoices reach your 2B monthly.

Where the Invoice Management System fits

Since October 2024 the portal's Invoice Management System (IMS) lets you act on each supplier invoice before GSTR-2B is final. You can accept it, reject it, or keep it pending. GSTR-2B is generated on the 14th with anything you have not acted on treated as accepted, and you can have it recomputed after changing IMS actions, up to the point you file GSTR-3B.

IMS changes the order of work, not the need to reconcile. Match first, then use IMS to act on the results: accept the matched bucket, reject invoices that are not your purchases, and keep pending the ones where the supplier has to correct a value. A rejected invoice drops out of your ITC and shows up for the supplier to fix.

Deadlines that make late reconciliation expensive

• 30 November. Section 16(4) allows ITC for a financial year only up to 30 November of the next year, or the date you file the annual return if that is earlier. An invoice that reaches GSTR-2B after that date gives you no credit.
• Rule 37A. If a supplier has filed GSTR-1 but has not filed GSTR-3B for the period by 30 September of the next year, you must reverse the ITC you took on their invoices by 30 November. You can re-claim it once they file.
• 180 days. Rule 37 requires you to reverse ITC on any invoice you have not paid within 180 days of its date, and add interest. It comes back when you pay. The ITC reversal calculator works out both reversals.

A worked month

A trader books 212 purchase invoices for August. GSTR-2B shows 205. After normalising invoice numbers, 198 match exactly and 4 match with a difference of less than ₹1, which is rounding. That leaves 10 invoices in the books only, 3 in GSTR-2B only, and none with a real value difference.

• The 202 matched invoices are claimed in August's GSTR-3B and accepted in IMS.
• Of the 10 books-only invoices, 7 are from two suppliers who file quarterly and will report them in their next GSTR-1. The other 3 are a supplier who hasn't filed at all. All 10 wait, and the supplier who hasn't filed gets a reminder with the invoice list.
• The 3 invoices in GSTR-2B only turn out to be a courier bill booked under the wrong month and two invoices for a sister concern. The first is booked; the other two are rejected in IMS.

You can run this matching in the GSTR-2B reconciliation tool. It reads the portal's GSTR-2B JSON (or a CSV) and your purchase register in the browser, so the files never leave your device. See the GST calendar to plan the monthly run around due dates.