ITR Filing Document Checklist, Complete Guide for AY 2025–26

Every April, CA firms across India enter the most demanding stretch of their calendar year: ITR season. Between juggling dozens, sometimes hundreds, of clients, tracking down missing documents, and managing filing deadlines, even the most organised practice can find itself drowning in WhatsApp messages and half-completed checklists. AY 2025–26 (covering the financial year 1 April 2024 to 31 March 2025) is no exception.

This guide gives you a complete, category-wise document checklist for income tax return filing, the kind you can hand directly to your team or share with clients before the first follow-up call even happens. Whether you are filing ITR-1 for a salaried individual or ITR-3 for a professional or business owner, this list covers every document you are likely to need.

Why a Standardised Checklist Matters for CA Firms

The single biggest cause of delay in ITR filing is not complexity, it is incomplete documents. Clients forget to provide their Form 16 Part B, or they send a bank statement that only covers nine of twelve months, or they leave out the capital gains statement from their broker. Each missing document triggers another follow-up, another delay, and another window for errors to creep in.

A well-structured checklist shared with the client before they start gathering documents eliminates most of this back-and-forth. ICAI guidelines have long encouraged systematic document management as a core practice standard, not just for compliance, but for the quality and defensibility of the return itself.

The CA who sends a clear document checklist before the season starts spends the season filing returns. The one who wings it spends it chasing the same PDFs every year.

Section 1, Identity & Basic Documents (All Clients)

These are required regardless of the income category of the client:

• PAN card, mandatory for all filers; verify that the name matches Aadhaar exactly to avoid e-verification failures
• Aadhaar card, required for e-filing and e-verification; Aadhaar–PAN linking must be confirmed as active before filing begins
• Previous year's ITR acknowledgement (ITR-V), needed to carry forward losses and verify consistency of disclosures year-on-year
• Bank account details, account number and IFSC of all accounts held during the year; one account must be designated for refund credit
• Mobile number and email ID linked to PAN/Aadhaar, for OTP-based e-verification on the income tax portal

Section 2, Salary Income Documents (ITR-1 / ITR-2)

For salaried employees, this is typically the largest and most variable category. Clients who changed jobs during FY 2024–25 will need documents from every employer:

• Form 16 (Part A and Part B), issued by the employer by 15 June; Part A contains TDS details reconciled with Form 26AS, Part B contains the salary breakup and employer-declared deductions
• Form 16A, for TDS deducted on non-salary income such as bank interest, rent received, or professional fees
• Form 12BA, statement of perquisites provided by the employer; required when the value of perquisites exceeds Rs 1 lakh for the year
• Salary slips for the full financial year, cross-check against Form 16 for HRA, LTA, and special allowance claims
• Joining or relieving letters, relevant when the client has changed employers; needed to reconcile multiple Form 16s correctly
• Rent receipts and landlord PAN, if HRA exemption is being claimed; landlord PAN is mandatory when monthly rent exceeds Rs 8,333

Section 3, Interest & Investment Income

• Bank passbook or statements for all accounts, covering the full FY 2024–25; savings account interest is taxable but deductible up to Rs 10,000 under Section 80TTA
• Fixed deposit interest certificates, from all banks and NBFCs; submission of Form 15G/15H does not exempt the interest from disclosure in the ITR
• Post office savings account passbook or statement, interest is exempt up to Rs 3,500 per year per individual account under Section 10(15)
• Form 26AS and AIS (Annual Information Statement), download directly from the income tax portal; review carefully before filing to reconcile TDS credits and all high-value transactions reported by third parties
• Capital gains statement from broker, covering equity, mutual funds, and debt instruments; distinguish short-term gains (STCG) from long-term gains (LTCG); note the revised LTCG exemption threshold of Rs 1.25 lakh applicable for equity from 23 July 2024 onwards
• Mutual fund redemption statements, CAMS or KFintech consolidated account statement (CAS) covers most AMFs; grandfathering values for pre-January 2018 equity investments may be needed for accurate LTCG computation
• Dividend income details, dividends from shares and mutual funds are fully taxable in the hands of the shareholder; TDS is deducted at 10% if total dividends from a single company exceeded Rs 5,000 during the year

Section 4, Business & Professional Income (ITR-3 / ITR-4)

For clients running a proprietorship, freelance practice, or small business under the presumptive taxation scheme:

• GSTIN registration certificate and GSTR-3B / GSTR-1 filings, turnover reported in GST returns must reconcile with income declared in the ITR; mismatches between the two frequently trigger automated notices
• Books of accounts, P&L statement and balance sheet for the year; mandatory if turnover exceeds Rs 25 lakh for service businesses or Rs 2.5 crore for trading under the presumptive scheme threshold
• Bank statements for all business accounts, including current accounts, overdraft accounts, and any loan accounts in the firm's name
• TDS certificates (Form 16A), from clients or platforms that have deducted tax on payments; aggregate carefully since many freelancers and consultants receive TDS from multiple payers
• Tax audit report (Form 3CA/3CB and 3CD), if the client's turnover exceeds the audit threshold under Section 44AB; the due date for the audit report is 30 September 2025
• Fixed asset register, for depreciation calculation under Income Tax Rules; WDV as at 31 March 2024 is the opening balance for FY 2024–25
• Business loan statements, principal and interest schedule for all loans; interest paid on business borrowings is deductible, principal repayment is not

Section 5, Deductions Under Chapter VI-A

These documents support the deduction claims that reduce taxable income. They must be available before the return is filed and retained for at least six years in case of scrutiny assessment:

• Section 80C investments, LIC premium receipts, PPF passbook with contribution details, ELSS statement showing investment date and amount, NSC certificates, tuition fee receipts, home loan principal repayment certificate, five-year tax-saving FD receipt
• Section 80D health insurance premium receipts, for self, spouse, children, and parents; additional deduction of Rs 25,000 (Rs 50,000 if parent is above 60) is available for parents' premium paid
• Section 80E education loan interest certificate, from the lending institution; the deduction is available for eight consecutive assessment years from the year repayment begins
• Section 80G donation receipts, must include the 80G registration number of the recipient organisation; eligible institutions are searchable on the income tax portal under the search for charitable institutions
• Section 80TTA / 80TTB interest details, savings interest certificate from the bank; Rs 10,000 deduction limit for individuals below 60, Rs 50,000 for senior citizens under 80TTB covering all interest income
• NPS contribution statement (Section 80CCD), from NSDL or KFintech; employee contribution qualifies under 80CCD(1) within the 80C cap, additional self-contribution of up to Rs 50,000 under 80CCD(1B), employer NPS contribution under 80CCD(2)
• Home loan interest certificate, from the lender for Section 24(b) deduction; up to Rs 2 lakh for self-occupied property; no ceiling for let-out property, though set-off of losses from house property against other heads is capped at Rs 2 lakh per year

Section 6, House Property Income

• Rental agreement and rent receipts, for any let-out property; gross annual value is the higher of actual rent received or the property's fair municipal valuation
• Municipal tax payment receipts, property tax paid during the year is deductible from the gross annual value before the standard deduction of 30% is applied
• Home loan interest certificate, if the let-out property is under a mortgage; interest is deductible without limit against rental income, subject to the Rs 2 lakh set-off cap against other income heads
• Co-ownership details, full names, PAN numbers, and ownership share percentages of all co-owners; income from co-owned property must be apportioned correctly in each co-owner's return

Section 7, Foreign Income & Assets (Schedule FA)

Resident Indians and Non-Resident Indians filing as residents must disclose foreign assets and income under Schedule FA. Non-disclosure under the Black Money (Undisclosed Foreign Income and Assets) and Imposition of Tax Act, 2015 carries severe penalties that are not compoundable:

• Foreign bank account statements, account number, bank name, country, and year-end balance in foreign currency and INR equivalent
• Foreign asset details, overseas property, equity shareholdings in foreign companies, financial interest in any foreign entity, or signing authority in any foreign account
• DTAA benefit documentation or Form 67, for claiming foreign tax credit on income already taxed in the source country; Form 67 must be filed before the ITR due date to claim the credit
• FEMA / LRS remittance records, if the client has remitted funds abroad under the Liberalised Remittance Scheme during the year; aggregate remittances above USD 2,50,000 in a financial year require prior RBI approval

Putting the Checklist to Work in Your Practice

Collecting all of these documents from 200 or 300 clients simultaneously is where most CA firms feel the strain of ITR season. The traditional approach, WhatsApp groups, email threads, manual tracking in Excel, breaks down quickly at scale. Documents arrive out of order, get buried in chat threads, or end up in personal inboxes rather than the firm's shared Google Drive folder.

Practivo turns your checklist into an interactive document request that clients respond to through a secure, PIN-protected guest link. No client login is required. Every file the client uploads goes directly to the correct Google Drive folder, tagged to the right client, with a timestamped audit log. Your team can see at a glance which clients have submitted everything, who is still outstanding, and which specific documents are missing, without sending a single manual follow-up message.

For larger firms with Owner, Manager, and Staff roles, Practivo's role-based access ensures that junior staff can handle document collection without visibility into sensitive client financials they should not see. The audit trail satisfies ICAI practice management expectations and provides a defensible record if any dispute arises later regarding what was submitted and when.

The firms that get through ITR season with the least stress are not necessarily the ones with the biggest teams. They are the ones with the most systematic document collection process, and AY 2025–26 is a good year to build yours.