With the ITR season for AY 2026-27 (FY 2025-26) underway, this is also the last filing cycle governed entirely by the old Income Tax Act, 1961 the new Income Tax Act, 2025 comes into force from April 1, 2026, but AY 2026-27 covers income earned before that date. For CA firms managing dozens (or hundreds) of clients, missing a single deadline can mean penalties, lost carry-forward benefits, and unhappy clients. Here's your pre-filing checklist to stay ahead of the curve.

Know the Deadlines They're Staggered This Year

For AY 2026-27, deadlines are no longer one-size-fits-all:

Miss the original date and you can still file a belated return under Section 139(4) by December 31, 2026 but you'll face a late fee under Section 234F (₹1,000 or ₹5,000 depending on income) and lose the ability to carry forward certain losses (barring house property loss and unabsorbed depreciation).

Revised returns under Section 139(5) also run until December 31, 2026 in the normal course filing beyond that, up to March 31, 2027, attracts a late fee of up to ₹5,000.

Your Pre-Filing Checklist

1. Segment clients by deadline, not alphabetically Group your client list by ITR form type and due date first. A salaried client and an audit-case client should never be sitting in the same follow-up queue — their clocks run out at different times.

2. Reconcile Form 26AS, AIS, and TIS early Don't wait until the last week to catch mismatches between TDS credits, reported income, and what your client actually earned. Early reconciliation avoids last-minute scrambling and refund delays.

3. Chase documentation in phases Send document requests (Form 16, capital gains statements, bank interest certificates, rent receipts) at least 3–4 weeks before each client's specific deadline not a single blanket reminder for everyone.

4. Flag audit clients immediately If a client's turnover crosses the Section 44AB threshold, their tax audit report is due by September 30, 2026 a full month before the October 31 ITR deadline. (For transfer pricing cases, the audit report is due October 31, with the ITR itself due November 30.) These clients need to be engaged first, not last.

5. Track regime selection per client With old vs. new tax regime choices still in play, confirm each client's regime election before computation a missed switch can mean a materially different tax outcome.

6. Build in a buffer for e-verification Filing isn't complete until e-verification (Aadhaar OTP, net banking, or DSC) is done within 30 days. Build this into your internal deadline, not the government's.

7. Keep a firm-wide status dashboard When you're juggling hundreds of clients across four different deadlines, a shared, real-time view of "filed / pending / awaiting documents" per client is what separates a smooth season from a chaotic one.

Why This Season Is Different

The staggered deadline structure (July 31 → August 31 → October 31 → November 30) means your firm no longer has one crunch — it has four. Client tracking, document collection, and internal task assignment need to scale accordingly. Firms still running this on spreadsheets or WhatsApp threads often find clients slipping through the cracks between deadline tiers.

This is exactly the kind of seasonal load that CAdesk's Task Management and File Organizer are built for segment clients by deadline tier, auto-track document status, and get a single dashboard view across your whole practice instead of chasing updates across Excel sheets and chat groups.

Note: Deadlines above reflect current guidance for AY 2026-27; always cross-check against the latest CBDT circulars before finalizing your firm's internal calendar.