Not able to choose new tax regime for HUF

For an HUF, the New Tax Regime is the default setting as of AY 2024-25. If you do not see an option to "choose" the new regime, it is because it is already active by default. If you wish to use the Old Tax Regime, you must manually opt out in the "Personal Information" section of your ITR, or file Form 10-IEA if your HUF has business or professional income.