To simplify this 12 lakh Nil tax issue : ➡️Suppose your income is upto 12 Lakhs ➡️You pay 0 for the first 4L ➡️From 4Lakh - 8Lakh i.e the next 4Lakh, you pay 5% tax = 20,000. ➡️From 8Lakh - 12 lakh i.e. another 4Lakh, you pay 10% tax = 40,000. ➡️Total Tax Payable= 60,000 ➡️Standard Deduction rebate = 75,000. So effectively , post rebate there is no tax for income upto 12 lakhs