GST
GST Return Filing Calendar: How to Prepare Each Tax Period
GST return filing calendar: build a reliable period-by-period routine
A repeatable filing routine is often more useful than collecting documents at the last minute. The returns and due dates that apply depend on the taxpayer's registration, scheme, turnover, activity, notifications and tax period. Use the official GST portal to confirm the current due date and filing requirement rather than relying on a fixed date remembered from a previous period.
Step 1: Confirm the tax period and return scheme
At the start of each period, confirm the GSTIN, filing frequency, applicable returns and any scheme or special condition. Check whether the taxpayer is monthly or quarterly under the applicable arrangement and whether a special notification or extension affects the period.
Step 2: Set a document cut-off
Ask for sales registers, purchase registers, invoices, credit and debit notes, marketplace reports, export records, e-invoice or e-way bill summaries where relevant, and prior-period reconciliation notes. Keep the original source files and record when each report was downloaded. If information is missing, flag it before preparing the return.
Step 3: Reconcile sales and purchases
Match sales records to invoices and settlement reports. Compare purchase records with GSTR-2B and inspect supporting invoices. Review customer GSTINs, tax rates, credit notes, returns, amendments and other adjustments. For e-commerce sellers, separate gross sales, refunds, platform fees, taxes collected and net settlement.
Step 4: Prepare the returns
Prepare GSTR-1 using the applicable outward-supply classifications. Prepare the GSTR-3B working from the reviewed tax liability, eligible ITC and other adjustments. Check that related figures are consistent and investigate differences. Never change a genuine invoice date or transaction value simply to bypass a portal validation or monthly restriction.
Step 5: Review payment and portal ledgers
Check the tax payable, available credit and cash ledger, challans and any earlier-period balance or liability. Ensure the responsible person understands the payment amount and filing status. Keep proof of payment and the filed return acknowledgement.
Step 6: File and archive
Complete the applicable portal steps and verify the filing status. Save the filed returns, acknowledgements, source reports and reconciliation workings in a folder labelled with the GSTIN and tax period. Restrict access to sensitive data and avoid sending passwords or OTPs through unsecured channels.
A simple internal timeline
- Early in the period: request records and confirm filing requirements.
- After receiving data: reconcile sales, purchases and platform statements.
- Before submission: review variances, tax liability, ITC and payment.
- After filing: save acknowledgements, update the compliance tracker and record open issues for the next period.
Common process failures
- Starting after the due date is close.
- Receiving incomplete reports from different platforms.
- Mixing periods or GSTINs in the same workbook.
- Using net bank deposits as sales.
- Ignoring unresolved GSTR-2B differences.
- Filing without a documented review.
- Failing to preserve proof of filing.
For multi-GSTIN businesses, maintain separate workpapers for each GSTIN and period, then use a consolidated tracker only for management visibility. Assign an owner to each task and keep a status field for documents received, reconciliation complete, return prepared, approved, filed and acknowledgement saved.
FileFast Global can help businesses organise GST records and prepare GSTR-1 and GSTR-3B based on the information provided. Scope and fees depend on transaction volume and complexity.
Disclaimer: General information only. Always verify the current due date and filing instructions for your GSTIN and period through official GST resources.