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 Rs. 12 lakhs
All this is under the new tax regime