A clean ITR filing starts with a clean document checklist. Keep your PAN, Aadhaar, mobile number linked with Aadhaar, email ID, Form 16, AIS/TIS, Form 26AS and bank statements ready.
If you claim deductions, also collect LIC, PPF, ELSS, tuition fee proof, rent receipts and home loan interest certificates. For capital gains, broker reports and mutual fund statements are important.