You can pay zero tax on a salary of 15 lakhs, provided you have invested in tax savings options and claim applicable deductions and exemptions. Under the old regime, your net tax payable can be zero if you claim exemptions and invest in tax-saving schemes. In case you are following the new tax regime for FY 20-21, FY 21-22 & FY 22-23 the net tax payable amount will be INR 32,500. For FY 23-24 onwards, the net tax payable on 7 lakhs is zero, as the tax rebate limit has been increased to INR 7,00,000.