Annual return season is where a CA firm's entire year of monthly/quarterly GST work gets reconciled into one consolidated filing — and where small errors compound across 12 months of data. With the GSTR-9 and GSTR-9C due date for FY 2025-26 set at December 31, 2026, here's a firm-wide checklist to keep every client on track.

Know Who Needs What

A key point many junior staff miss: GSTR-9C has been self-certified since FY 2020-21 — it no longer needs separate CA/CMA certification as an audit sign-off, though your firm is still very much the one preparing and validating it.

Don’t dismiss "optional" too quickly. Even for clients under ₹2 crore, filing GSTR-9 is worth recommending if they have unclaimed ITC sitting in Table 8D, or if their filing history could otherwise get flagged in portal analytics against AIS data.

Your Firm-Wide Pre-Filing Checklist

1. Segment your client list by turnover tier

Split clients into three buckets immediately: below ₹2 crore (optional), ₹2–5 crore (GSTR-9 only), above ₹5 crore (GSTR-9 + GSTR-9C). Each bucket needs a different workload plan and, for the top tier, more lead time.

2. Confirm every monthly/quarterly return is filed and closed

GSTR-9 cannot be filed cleanly if GSTR-1 or GSTR-3B returns for any period in FY 2025-26 are still pending. Run this check first — it's the single most common blocker firms hit in December.

3. Reconcile GSTR-2B ITC against the purchase ledger

Match input tax credit as reflected in GSTR-2B with what's recorded in the client's books. Flag mismatches early; chasing vendor corrections in the last week of December is where firms lose the most time.

4. Clear the IMS dashboard

Check the Invoice Management System for any invoices sitting in "pending" status — these need action before annual figures are finalized, since GSTR-9 tables now auto-populate from IMS-linked data.

5. Capture amendments made between April–November 2026

Any correction entries made in GSTR-1/GSTR-3B during the year for FY 2025-26 transactions need to flow correctly into Tables 10 and 11 of GSTR-9 — this is a frequent source of mismatches during review.

6. Pre-compute any DRC-03 liability

If reconciliation reveals short-paid tax or excess ITC claimed, settle it via DRC-03 before filing — not after. GSTR-9 offers no direct route to pay outstanding tax within the form itself.

7. Build in a hard internal deadline — well before December 31

GSTR-9 cannot be revised once filed. Set your firm's internal review deadline at least 2–3 weeks ahead of the statutory date, so there's time to preview the auto-generated summary and catch errors before final submission.

8. Prioritize your ₹5 crore+ clients for GSTR-9C prep

These clients need reconciliation between audited financials and GSTR-9 turnover — explaining variances from unbilled revenue, credit notes, deemed supplies, or exempt supplies. This is the most time-intensive part of the season; start here first, not last.

Why This Deserves a Firm-Wide System, Not Just a Checklist

The real risk in annual return season isn't any single step — it's dozens of clients moving through these eight steps simultaneously, each at a different stage, with no shared visibility across your team. A missed IMS reconciliation for one client and a pending DRC-03 for another can both slip through if your firm is tracking status across scattered spreadsheets or individual staff inboxes.

This is where CAdesk's Task Management and File Organizer earn their keep during annual return season — segment clients by turnover tier, assign and track each of the eight checklist steps per client, and get one dashboard view of who's filed, who's blocked, and who needs a nudge before December 31.

Note: Due dates and thresholds above reflect current guidance for FY 2025-26; the government has extended GSTR-9/9C deadlines in past years via CBIC notification, but firms should plan against the statutory date and not around a possible extension.

Official Government References

• CBIC GST Portal (cbic-gst.gov.in) — official notifications and circulars

• Rule 80 of the CGST Rules, 2017 — CBIC Tax Information — statutory basis for GSTR-9 and GSTR-9C filing requirement, turnover thresholds, and the Dec 31 due date

• Circular No. 246/03/2025-GST, CBIC — clarification on late fee applicability for delayed GSTR-9C filing

• Consolidated FAQ on GSTR-9/9C for FY 2024-25 — GSTN (tutorial.gst.gov.in) — official GSTN answers on Table 8A, ITC reclaims, and reconciliation queries

• Notification No. 15/2025-Central Tax (Sept 17, 2025) — exempts filers with turnover up to ₹2 crore from GSTR-9

• Notification No. 13/2025-Central Tax (Sept 22, 2025) — updated GSTR-9/9C formats (ITC splits, rule-wise reversal disclosures, Table 9 reconciliation)

• Notification No. 08/2025-Central Tax (Jan 23, 2025) — late fee waiver for FY 2017-18 to FY 2022-23 GSTR-9C filings

• Statutory basis: Section 44 of the CGST Act, 2017, read with Rule 80 of the CGST Rules, 2017