If you were on the old tax regime but inadvertently filed your Income Tax Return (ITR) under the new regime for the 2026 financial year, don't panic. For individuals without business income, selecting the new regime annually is usually permissible. However, if you have business income, failing to submit Form 10-IEA before selecting the new regime means your choice is invalid. In such cases, you'll need to submit the correct form and then file a revised ITR.
I was under the old tax regime in March 25 but in March 26 inadvertenlty without withdrawal from the old regime and without opring new regime I have filed my ITR in new regime. What to do in such a case.
25 August 2026
If the taxpayer has no business income, filing under the new regime is generally valid since salaried individuals can choose their regime annually in the ITR. However, if business or professional income exists, failing to file Form 10-IEA invalidates the new regime selection, requiring the submission of the prescribed form followed by a revised ITR.