Income Tax Filing Workflow for CA Firms — Step-by-Step Guide

For most CA firms in India, the period between April and July is the busiest of the year. Hundreds of income tax returns need to be filed — for individual clients, business clients, HUFs, partnership firms, LLPs and companies. Without a clear, documented workflow, ITR season becomes stressful, error-prone and exhausting. This guide walks through the complete income tax filing workflow — from the moment the season begins to the moment the ITR acknowledgement is in the client's hands.

Phase 1 — Pre-Season Preparation (March to April)

Before the ITR season begins, your firm should be fully prepared. Use March and early April to set up for a smooth season:

• Update your complete client list — identify new clients added since last ITR season, clients who have left, and any changes in services
• Identify which clients need ITR filing and which form they require — ITR-1 for simple salaried income, ITR-2 for capital gains, ITR-3 for business income, ITR-4 for presumptive income, ITR-5 for firms and LLPs, ITR-6 for companies, ITR-7 for trusts
• Identify clients who will need tax audit — turnover above Rs 1 crore for business, Rs 50 lakh for professionals (subject to conditions)
• Review prior year ITRs for each client to understand their tax profile — income sources, deductions claimed, carry-forward losses
• Set up compliance tasks in your practice management system for each client before the season begins — do not do this in June
• Brief your team on this year's changes — new ITR forms, amended rules, changes in deduction limits, new income sources to report

Phase 2 — Document Collection (April to June)

Document collection is the most critical and most time-consuming phase. The quality of your ITRs depends entirely on the completeness of the documents you receive. Create and send a document checklist to each client in April — do not wait for June.

For salaried individuals, the document checklist includes:

• Form 16 from employer — request this from clients as soon as their employer issues it (typically May to June)
• Form 26AS and AIS (Annual Information Statement) from the income tax portal — download for each client
• Bank interest certificates for all bank accounts — savings account interest, fixed deposit interest
• Home loan interest certificate for the financial year (if the client has a home loan)
• House rent receipts and landlord PAN (if claiming HRA exemption)
• Investment proofs for deductions: PPF statement, LIC premium receipts, ELSS statements, NSC certificates, school fee receipts for Section 80C | Medical insurance premium receipts for Section 80D | Donation receipts for Section 80G

For business and professional clients, the document checklist includes:

• Final accounts for FY 2025-26: profit and loss statement and balance sheet — ensure these are signed and finalised
• Bank statements for all business accounts — verify all credits and debits against the books
• TDS certificates (Form 16A) for all TDS deductions made by clients or customers
• Form 26AS and AIS — compare TDS credits in 26AS against books and certificates
• GST reconciliation between GSTR-1, GSTR-3B and books of accounts
• Details of fixed assets, capital additions and depreciation schedule

Phase 3 — ITR Preparation

1. Download and review Form 26AS and AIS for each client — this is the single most important step; discrepancies between 26AS and the client's books are the most common cause of tax notices
2. Match TDS deductions in Form 26AS against Form 16, Form 16A and all other TDS certificates provided by the client
3. Verify income from all sources — salary, business profits, capital gains from shares or property, income from other sources like interest and dividends
4. Calculate eligible deductions — Section 80C (investments up to Rs 1.5 lakh), Section 80D (health insurance), Section 80G (donations), Section 24(b) (home loan interest), Section 80E (education loan interest) and other applicable sections
5. Calculate tax liability under both the old tax regime and the new tax regime if the client is eligible to choose — identify which is more beneficial
6. Prepare the ITR computation showing income, deductions, taxable income and tax liability
7. Advise the client on which tax regime to opt for with the actual figures, not an estimate
8. Prepare all required schedules — capital gains schedule, foreign income schedule if applicable, house property schedule
9. Internal review by a senior team member or partner before submission — never file without a review step

Phase 4 — ITR Filing

The filing process itself, once the computation is complete and reviewed, follows these steps:

• Login to the income tax e-filing portal at incometax.gov.in using the client's credentials or CA login
• Select the appropriate ITR form based on the client's income type and source — verify this has not changed from the prior year
• Fill in or verify the pre-filled data — the portal pre-fills data from 26AS and AIS, but this must be verified, not accepted blindly
• Enter computed figures from the ITR computation — income, deductions, tax liability, advance tax paid, TDS credits
• Upload supporting documents where required by the form
• E-verify the return immediately after filing — use Aadhaar OTP for individual clients, net banking verification, or DSC for companies and audited cases
• Download the ITR-V acknowledgement immediately after e-verification
• If not e-verified, the physical ITR-V must be sent by speed post to CPC Bengaluru within 30 days — track these carefully as unfiled returns are treated as invalid

Phase 5 — Post-Filing

Filing is not the end of the workflow. Post-filing steps are important for client service and your own records:

• Store the ITR-V acknowledgement in the client's document folder immediately — not in an email, in the document storage system
• Inform the client that their ITR has been filed — send an email or WhatsApp with the acknowledgement number and ITR-V attached
• Update the filing status in your practice management system — mark the task as complete
• Note the refund amount (if any) so you can inform the client when to expect it
• Monitor for any intimation under Section 143(1) in the following months — the portal sends an intimation after processing, which may show a tax demand or refund confirmation
• If an intimation shows a mismatch or demand, inform the client immediately and respond within the specified time

Managing the Workflow Across 100+ Clients

The challenge for CA firms with large client bases is managing all of this simultaneously across 100 to 500 clients. Every client is at a different stage — some are still waiting to receive documents, some are in preparation, some are ready to file, some are filed. Without a system, the partner spends 30 to 60 minutes every morning asking team members for status updates, and still does not have a complete picture.

With a proper task management system, the complete picture is available in under a minute. Each client has a task that moves through defined stages: Documents Pending, Documents Received, In Preparation, Under Review, Filed, Acknowledged. The partner can see how many clients are in each stage at a glance. Overdue tasks are flagged automatically. Team members update status as they work, not in response to a manager's question.

Common Mistakes in ITR Filing Workflow

• Starting document collection too late — waiting until June to ask for documents means many clients do not respond until July, leaving no time to prepare
• Not reviewing Form 26AS and AIS before filing — this is the most common cause of tax notices; always reconcile 26AS before filing
• Filing without a senior review — saves 15 minutes but creates the risk of errors that take hours to rectify and damage client trust
• Not storing acknowledgements systematically — if a client disputes filing or receives a notice, the acknowledgement is critical evidence
• Not informing clients after filing — clients expect to be told when their return is filed; not doing so leaves them uncertain and creates unnecessary calls
• Missing the e-verification deadline — an unfiled e-verification means the ITR is treated as never filed, even if submitted

ITR Filing Deadlines 2026

• July 31, 2026: ITR deadline for individuals, HUFs and other non-audit cases — the busiest deadline for most CA firms
• October 31, 2026: ITR deadline for businesses and individuals subject to tax audit under Section 44AB
• November 30, 2026: ITR deadline for transfer pricing cases — for businesses with specified international or domestic transactions
• Belated return (Section 139(4)): December 31, 2026 — with a penalty of Rs 5,000 (Rs 1,000 for income below Rs 5 lakh)
• Updated return (ITR-U under Section 139(8A)): Within 2 years from the end of the relevant assessment year — with additional tax of 25% or 50%

A documented income tax filing workflow transforms ITR season from a stressful scramble into a well-managed operation. The workflow described here is what separates the CA firms that finish ITR season with happy clients and no missed deadlines from those that finish it exhausted and chasing penalties. Build the workflow once, document it, train your team and refine it each year. Every season becomes a little smoother.