This comprehensive blog post demystifies Section 142(1) notices from the Income Tax Department, specifically when issued for missing or incorrect deductions in your ITR. It explains the purpose of such notices, common reasons for their issuance (like Form 26AS/AIS/TIS mismatches or lack of supporting documents), and provides a step-by-step guide on how to prepare an accurate and timely response. The post also highlights the severe consequences of non-compliance and offers valuable tips for prevention through meticulous record-keeping and thorough ITR review.