Asst Manager(Internal audit)
1679 Points
Joined May 2011
Tax exemption on HRA is least of the following:
1) Actual HRA received
2) Actual rent paid reduced by 10% of salary
3) 50% of basic salary if the taxpayer is living in a metro city
4) 40% of basic salary if the taxpayer is living in a non-metro city
Since the least of the above is exempt from tax, you can ask your employer to restructure your salary to get maximum tax benefit.
If all the factors mentioned above remain constant then tax exemption on HRA can be calculated annually but if any factor changes within the relevant Financial Year then calculation needs to be done on a monthly basis.