What are the 10 ITR mistakes that can lead to penalties, tax notices?

Filing your ITR incorrectly can lead to penalties, tax notices and delayed refunds. Common mistakes include missing the deadline, under-reporting income, relying only on Form 16, choosing the wrong ITR form or tax regime, claiming incorrect deductions, AIS/Form 26AS mismatches, late revised returns, not reporting all income, incorrect bank details and failing to verify the ITR after filing.