To claim exemption rent receipt for beginning and ending month in the accounting should be enclosed.
For metro city it may be taken as 50% of Salary, and for Non Metro 40%.
Salary may be computed as Basic+ DA+ commission on fixed percentage of turnover.
Min of actual HRA received from employer, actual rent paid-10%, and 50% of basic salary if employee lives in Metro and 40% of basic salary if it is non metro may be taken for calculation.
If you are filing return thru your CA or Income Tax Lawyer he shall help you.
Valuable advice of learned experts/members is sought.