Filing your ITR for AY 2026-27 carelessly can trigger automated tax notices, so you must reconcile your data with the AIS and Form 26AS to avoid mismatches. Critical blunders include claiming unverified HRA or donation deductions, choosing the wrong form (like ITR-1 instead of ITR-2 for capital gains), hiding exempt income, and failing to combine income from mid-year job changes. Furthermore, skipping the mandatory foreign asset disclosures (Schedule FA) risks a ₹10 lakh Black Money Act penalty,