Late filing, wrong regime choices, AIS mismatches, refunds, updated returns and where to check the official rules.
Most tax trouble for individuals is not about clever planning. It comes from a few repeated errors: filing after 31 July and losing the old regime or a loss carry-forward, missing interest income that appears in the Annual Information Statement, claiming deductions that the new regime does not allow, or giving a bank account that has not been pre-validated for refunds.
This section collects those failure patterns and the fixes the law provides. Start with the common income tax mistakes guide. Then read about ITR due dates and late fees, updated returns, AIS and Form 26AS mismatches, refund delays, choosing between self-filing and a CA and the official sources list.
When something has gone wrong, act early. Interest runs month by month and some options close on fixed dates, but most errors can still be put right if you act before the department contacts you.
Mistakes and official sources
What AIS, TIS and Form 26AS show, why mismatches trigger income tax notices, how to submit AIS feedback and how to respond to a mismatch.
Mistakes and official sources
The income tax mistakes that cost most: late filing, wrong regime, missed AIS income, job-change shortfalls, challan errors and fake claims, with fixes.
Mistakes and official sources
Why income tax refunds are delayed: unvalidated bank account, inoperative PAN, unverified return, demand adjustment, and how to get a reissue.
Mistakes and official sources
ITR due dates under section 263, the ₹5,000 late fee, 1% monthly interest, belated and revised returns, and losing the old regime by filing late.
Mistakes and official sources
Official sources for Indian income tax: incometaxindia.gov.in, the e-filing portal, TRACES, India Code and e-Gazette, and how to verify a rule.
Mistakes and official sources
Self-filing on the free portal, filing platforms, tax preparers or a chartered accountant: what drives the cost, who needs help and warning signs.
Mistakes and official sources
Updated returns under section 263(6): the 48-month window, additional tax of 25–70%, when you cannot file one, and a worked example.
