Choice of tax regime: business taxpayers have limited switching rights while non business taxpayers may switch between regimes yearly. Taxpayers with business or professional income (Individuals, HUFs, AOPs except co operative societies, BOIs and artificial juridical persons) face restricted switching: after opting out of the new regime they have one chance to return to it and cannot thereafter select the old regime. Taxpayers with non business income may switch between regimes annually. The choice to adopt the old regime must be made before the due date for filing the return under the Income Tax Act.