It was a mistake that I selected the new regime thinking that it would be easy to switch back to old one during ITR Filing, but now I do not have proofs such as the premium amount paid (for parental and self insurance taken from company), sodexo vouchers received, since nothing is mentioned in the Form 16. Is my salary slip enough for showing as proof if I receive a notice, or is it necessary to have separate receipts for these deductions that I will be claiming? Anyone else in a similar condition as I am, please share your experience.