Dear Ramdass,
There are three ways to calculate the HRA:
1. Actual HRA received.
2. If you are living in a metropolitan city, it should be 50% of the basic salary; otherwise, it should be 40% of the basic component of your salary.
3. If you are paying rent and you have rent receipts, you should calculate "Rent paid - 10% of basic."
Now, the HRA Exemption equals the minimum return from the above three ways of calculation.
I hope this fulfills your query.
Regards,
Sanjay Gupta
9871018121