For the old regime, calculate tax at the old tax slab rates after availing all the eligible exemptions and deductions from the income. For instance, salaried individuals can claim exemption for leave travel allowance (LTA), housing rent allowance (HRA) and standard deduction of Rs 50,000. Also, individuals are allowed to claim deduction under Section 80C up to Rs 1.5 lakh and additional deduction of Rs 50,000 under Section CCD (1B) for contribution to the National Pension System (NPS), as well as those under Section 80D, and deduction for interest paid on home loans, etc. For the new regime, take the lower tax slabs and calculate accordingly.