Although the new income-tax regime has been made the default regime, you could still switch back to the old regime if you claim deductions and loan exemptions. But make sure you fill this form by July 31.
Income Tax Returns: The Budget 2023 saw FM Nirmala Sitharaman announce multiple changes in the New Tax Regime. Individual taxpayers can make a switch from the Old Tax Regime to the New Tax Regime as many times as they want. But that's not the same for individual taxpayers with business income.