GST filings involves more than simply filing returns. Before any return is filed, it helps to reconcile a few key registers so that the figures reported are accurate and Input Tax Credit is not lost due to a mismatch. This checklist covers the areas we typically review with clients each month.
1. Reconcile sales with GSTR-1
Start by matching your sales register against what is reflected in GSTR-1. Check that every invoice raised during the period has been captured, invoice numbers are sequential, and amendments or credit/debit notes from earlier periods have been recorded correctly. Errors here usually surface later as mismatches with a customer's Input Tax Credit claim, so it is worth catching them early.
2. Reconcile purchases with GSTR-2B
Your purchase register should be checked against GSTR-2B to confirm that the Input Tax Credit you intend to claim is actually reflected by your suppliers. Common issues include invoices that have not been uploaded by the supplier, invoices uploaded under the wrong GSTIN, or vendors who file late. A monthly reconciliation helps you follow up with vendors before it becomes a larger problem.
3. Review Input Tax Credit eligibility
Not every purchase invoice automatically qualifies for Input Tax Credit. Review credit claimed against blocked credits, personal-use expenses, and purchases used partly for exempt supplies. Keeping a clear working file of how ITC has been computed each month makes it much easier to respond if the department raises a query later.
4. Check e-invoices and e-way bills
If e-invoicing applies to your business, confirm that invoices have been generated correctly and that the values match your accounting records. Similarly, review e-way bills raised during the period against actual movement of goods, and ensure that vehicle and document details are consistent. Gaps between e-way bills and invoicing are a common source of departmental queries.
5. Keep records organised
Maintain organised digital or physical copies of:
- Sales and purchase invoices
- Debit and credit notes
- E-way bills and delivery documentation
- Bank statements showing GST payments
- Previous GST returns and reconciliation working files
Well-organised records make monthly filing faster and put you in a much stronger position if a notice or audit query comes up.
Common mistakes to avoid
- Filing returns without reconciling GSTR-2B, resulting in ITC claims that do not match
- Missing amendments to earlier invoices in the same or a later return
- Ignoring reverse charge transactions that need to be self-invoiced
- Not tracking e-way bills for goods movement separately from invoicing
- Leaving reconciliation until the annual return, when errors are harder to trace
Why monthly reconciliation matters
It can be tempting to treat GST filing as a once-a-month data-entry task, but reconciliation is what protects your Input Tax Credit and keeps your annual return manageable. Businesses that reconcile every month usually find that GSTR-9 and GSTR-9C preparation takes far less time, because most discrepancies have already been identified and corrected through the year. Businesses that skip this step often find themselves reconstructing an entire year's records under time pressure, which increases the chance of errors and missed credit.
Monthly reconciliation also puts you in a stronger position with vendors. If a supplier is consistently late in uploading invoices or filing their own returns, catching this early means you can raise it with them before a large amount of credit is affected. Left unaddressed, these gaps tend to compound over several months.
How we help
We assist businesses with GST registration, amendment and cancellation, GSTR-1 and GSTR-3B filing, GSTR-9 and GSTR-9C assistance, GSTR-2B and Input Tax Credit reconciliation, sales and purchase reconciliation, and e-invoice and e-way bill support, along with a periodic GST filings review so that discrepancies are identified early rather than at year end. Where a reconciliation throws up a genuine mismatch or a departmental query, we also assist with GST notices and reply preparation.