Details last reviewed on 5 October 2026. Rules and products change often. This is general information, not legal or tax advice, so confirm specifics with a qualified professional.
If you run finance at an Indian business, you know the last week of the month. E-invoices are reported late, supplier gaps surface for the first time, and someone is rebuilding from memory why a figure changed. Nothing in that week is hard. It all just arrives together.
This GST compliance workflow is built on rhythm: small tasks daily, a short review weekly, a fixed sequence monthly and a periodic look at long deadlines. It ties the tasks together and says who owns what; for the detail, see our guides to GST e-invoicing and IRN, GSTR-2B reconciliation and IMS and TDS under the Income-tax Act, 2025.
Why compliance piles up at month-end
Work is deferred. Reporting an invoice or booking a purchase bill feels optional on the day. It becomes urgent at month-end, with everything else.
Nobody owns the middle. Billing owns the invoice and the CA owns the return. The weeks between, where gaps are chased, belong to no one by name. Spreadsheets and point tools do their own job well; the breakage is in the handoff.
Evidence is rebuilt from memory. If nothing recorded who checked what and when, the audit trail is assembled later from email searches, which is slow and hard to defend.
The fix is not more effort. Move each task to the earliest day it can be done, give it an owner and leave a record, as in sound accounting workflows.
The operating rhythm
Four rhythms cover most of what a GST-registered business needs. Each has an owner and leaves evidence.
| Rhythm | Tasks | Suggested owner | Evidence it leaves |
|---|---|---|---|
| Daily | Report e-invoices inside the reporting window; raise the e-way bill before dispatch; book purchase bills as they arrive | Billing or accounts-receivable owner; purchase-bill owner | IRN against each invoice; e-way bill number against each dispatch; bills booked with dates |
| Weekly | Review supplier records in IMS; chase gaps with a named date; keep the pending list short | Accounts-payable or purchase owner | A dated list of open items, who was asked and when |
| Monthly | TDS deposit by the 7th; draft GSTR-2B on the 14th; reconcile; sign off before GSTR-3B | Finance controller, with the CA for review | Challan reference; variance report with a named reviewer's sign-off |
| Periodic | Watch the three-year bar on late returns; track the Section 16(4) date; review long-pending credits | Controller with your CA | A quarterly note of open periods and pending credits |
Owners will differ by company size. One person may hold several rows, but each row should carry a name, so a missed task is visible on the day.
Daily: report and dispatch
Two tasks decide whether the day is clean. First, e-invoices. From 1 April 2025, taxpayers with an annual aggregate turnover of Rs 10 crore and above cannot report e-invoices older than 30 days on the Invoice Registration Portal (GSTN advisory, 5 November 2024).
Reporting on the day removes the question. E-invoicing itself applies from Rs 5 crore turnover (Notification 10/2023-CT); confirm where you stand with your CA. The detail is in our e-invoicing guide.
Second, the e-way bill, generally needed above Rs 50,000 and valid one day per 200 km. Raise it before the vehicle leaves; confirm limits with your CA.
Weekly: the middle nobody owns
This is the rhythm most teams skip, and the one that shrinks month-end the most. Once a week, someone opens the supplier records in the Invoice Management System (IMS) and looks at what has arrived.
Accepted records make credit available and flow into GSTR-3B. Rejected records do not. Pending records stay out of GSTR-2B and GSTR-3B until you act. A record with no action is deemed accepted when GSTR-2B is generated.
So the weekly review is mostly about not letting "no action" decide for you. For each gap, write down the cause, who you asked and when you will ask again. Mechanics are in our GSTR-2B and IMS guide.
The monthly spine
Three dates anchor the month, and the weekly work should have cleared most of the ground before them.
- By the 7th: deposit TDS for the previous month (30 April for March). Interest on delayed deposit is 1.5% per month. The Income-tax Act, 2025 has been in force since 1 April 2026, with TDS in sections 392 and 393 and rates and thresholds retained. See our TDS guide for which Act applies to which payment.
- The 14th: the draft GSTR-2B is generated. You can keep acting in IMS afterwards, but recompute GSTR-2B to see those actions.
- After the 14th: reconcile purchases against GSTR-2B, classify each difference, and sign off.
Close day: the checklist
Close day runs the whole spine in order. If the daily and weekly work has happened, it is short. Keep the ticked copy as evidence.
- TDS for the previous month deposited by the 7th; challan reference filed with the payment record
- Every sales invoice for the month has an IRN where e-invoicing applies, and none is waiting past the reporting window
- All purchase bills for the period are booked, so the register is complete before it is locked
- Draft GSTR-2B generated on the 14th; the register locked for the same period
- Each difference has one named cause and an action in IMS: accept, reject or pending
- Every pending item has an owner and a next chase date
- GSTR-2B recomputed after your IMS actions
- Variance report signed by a named reviewer before GSTR-3B is filed
- Late returns and old periods checked against the three-year bar
The sign-off sits before filing, so a reviewer's question can still change the return.
Periodic: the long deadlines
Put the long deadlines on a GST compliance calendar that someone reviews each quarter.
- The three-year bar. The GST portal bars returns more than three years past their due date from 1 December 2025. An old, unfiled period is no longer something to tidy up later.
- Section 16(4). Input tax credit on an invoice has a statutory cut-off, generally taken to be 30 November following the financial year. Treat that as something to confirm with your CA, and use it to decide which pending items cannot wait.
- Long-unpaid suppliers. Rule 37 can require a credit reversal after 180 days unpaid; confirm with your CA. Payable ageing, in our procure-to-pay guide, shows these early.
Keeping an audit trail without extra work
A GST audit trail is mostly a by-product of the rhythm. Record each step when it happens, name a person rather than a team, and keep corrections as new entries that reference the original instead of overwriting. The weekly chase log then explains any pending item later.
Common mistakes
- Treating the 14th as the start. By then the gaps should already be known.
- Leaving IMS on "no action". A record not actioned is deemed accepted at GSTR-2B generation.
- No owner for the middle. If weekly IMS review has no name, it does not happen.
- Signing off after filing. A sign-off that follows the return cannot change it.
- Letting pending become a parking lot. Each pending item needs an owner and a chase date.
What OpsGrids has today
OpsGrids Finance covers GST returns with a diff against your books and TDS withholding, on a full ledger. The e-invoicing (IRN), e-way bill and IMS workflows are e-invoice-ready but run against a simulated government portal today; until the live connection ships, use the official portals or your GST Suvidha Provider. Invoices are append-only, so a correction is a new row that references the original, which helps the audit trail described above. See how money is handled across the platform, and all products.
Notification rules can send events, such as an invoice being finalised, to people on WhatsApp or email. Our guides to WhatsApp automation and email automation cover how to design those messages.
Today these cover the records and the events; the owners, dates and sign-offs in this article remain your team's routine. No software guarantees compliance: your data, the portal's availability and your CA's judgement still decide the outcome.
FAQ
What is a GST month-end checklist? A short list run once a month: TDS deposit, e-invoice completeness, GSTR-2B on the 14th, reconciliation, IMS actions and a named sign-off before GSTR-3B.
Who should own each task? Whoever is closest to the source: billing for daily reporting, a purchase owner for weekly IMS review, the controller for monthly sign-off, with your CA reviewing.
How do we keep GST evidence without extra paperwork? Record each step when it happens: the IRN on the invoice, the challan reference with the payment, the chase date beside a pending item and the reviewer's sign-off.
How often should we review the long deadlines? Quarterly is reasonable: old unfiled periods, pending credits near the Section 16(4) cut-off and long-unpaid suppliers. Confirm dates with your CA.
Turn month-end into a routine
If you want to see how this rhythm could run on your own invoices and returns, Talk to our team for a walkthrough.
Sources (checked 5 October 2026)
- GSTN advisory on e-invoice reporting time limit, 5 November 2024 (gst.gov.in)
- GSTN FAQs and advisories on the Invoice Management System (tutorial.gst.gov.in)
- GST Council Newsletter, Issue 79, on the three-year return bar (gstcouncil.gov.in)
- CGST Act, 2017 and CGST Rules, 2017, as published by the CBIC (cbic.gov.in)
- Income-tax Act, 2025 and the Income Tax Department's FAQs (incometax.gov.in)