A common misconception is that if TDS has already been deducted by the employer or bank, there is no need to file an ITR. This is legally incorrect. With the introduction of the Annual Information Statement (AIS), the Income Tax Department tracks almost every high-value financial transaction you make, regardless of your filing status.
If you fail to file your ITR while your AIS shows significant mutual fund investments, a new car purchase, foreign travel, or large cash deposits, the department's AI systems will automatically flag your PAN. This triggers a scrutiny notice asking you to explain the source of funds, often leading to heavy penalties and stress.