The baseline documents almost everyone needs
Regardless of your specific income situation, a few documents form the baseline for any ITR filing: your PAN and Aadhaar (linked, since this is now generally required), bank account details for all accounts held during the year (for refund credit and reporting interest income), and your Form 26AS and Annual Information Statement (AIS), both accessible through the income tax portal, which summarise TDS credited and various financial transactions reported against your PAN during the year.
Pulling your Form 26AS and AIS early is worth doing before gathering anything else, since these two documents often reveal income sources or TDS credits you might otherwise forget about entirely — a small TDS deduction from a fixed deposit at a bank you rarely use, for instance, is easy to miss without checking.
If you're a salaried employee
Form 16 from each employer you worked for during the year (not just your current one, if you switched jobs). Rent receipts and your rental agreement, if you're claiming HRA exemption and didn't submit these to your employer's payroll on time. Home loan interest and principal certificate from your bank or housing finance company, if you have a home loan and are claiming Section 24(b) interest deduction or 80C principal repayment.
If your employer's Form 16 already reflects your HRA and home loan claims accurately, you may not strictly need the underlying receipts for filing itself — but keeping them on hand for at least a few years is a reasonable precaution in case of a later query.
If you have investments or have sold any
Capital gains statements from your broker or mutual fund platform (most platforms provide a consolidated capital gains statement for the financial year on request or as a downloadable report), showing realised gains or losses from stocks, mutual funds, or other securities sold during the year. Bank and FD interest certificates, showing interest earned and any TDS deducted on fixed deposits.
If you've sold property during the year, you'll additionally need the sale deed, purchase deed (to establish cost of acquisition), and any improvement cost receipts, since these determine your capital gains calculation on that specific transaction — property transactions tend to require more supporting documentation than financial asset sales.
If you have a home loan, life insurance, or health insurance
Home loan interest certificate (as mentioned above, for Section 24(b) and 80C claims). Life insurance premium receipts, if claiming under 80C and not already reflected in your Form 16. Health insurance premium receipts, for your own policy and any policy covering parents, since these fall under Section 80D, separate from 80C.
For health insurance specifically, note whether the policy covers senior citizen parents, since the deduction limit is higher in that case — the premium receipt combined with knowing your parents' age bracket determines which limit applies.
If you're a freelancer or have business income
Income records for freelance or business activity — invoices raised, payments received, and, if opting for regular (non-presumptive) taxation, expense records supporting any deductions claimed against that income. If you've opted for presumptive taxation under Section 44ADA or 44AD, you'll need total turnover or gross receipts figures rather than a detailed expense breakdown, since presumptive taxation calculates taxable income as a fixed percentage of turnover.
GST-related documents, if applicable to your business activity and registration status, since GST filings and income tax filings both draw from overlapping revenue figures that should be consistent between the two.
A simple pre-filing gathering checklist
1. PAN, Aadhaar (linked), and bank account details for all accounts. 2. Form 26AS and AIS, downloaded from the income tax portal. 3. Form 16 from every employer during the year. 4. Capital gains statements from brokers or mutual fund platforms, if applicable. 5. Home loan interest certificate, if applicable. 6. Life and health insurance premium receipts, if not already fully reflected in Form 16. 7. Rent receipts and rental agreement, if claiming HRA and not already reflected in Form 16. 8. Business or freelance income and expense records, if applicable. 9. Property sale and purchase deeds, if you sold property during the year.