The Least-of-Three Rule Under Section 10(13A)
Tax-exempt HRA is the lowest of three amounts: the actual HRA received from your employer, the actual rent paid minus 10% of Basic Salary + DA, or 50% of Basic Salary + DA for metro cities (Delhi, Mumbai, Kolkata, Chennai) versus 40% for all other cities. Whichever of these three figures is smallest becomes your exempt amount, and the rest of the HRA received is added to taxable salary.