Withdrawal of tax election: filing Form 10IEA is irrevocable in the year; switch to the new regime possible next year. Once Form 10IEA is filed for an assessment year it cannot be revoked or withdrawn in that same assessment year; a taxpayer seeking to opt for the new tax regime after filing must make the withdrawal or re-file the election in the next assessment year, and the option to remain under the old regime must be exercised before the due date for filing the return under the return-filing provision.