It is most hazard to calculate the Income Tax Liability with the other calculation like as House Rent Exemption or Arrears Relief Calculation in separately, but if you have any Excel Based Software which can prepare at a time the Income Tax Compute Sheet + Individual Salary Structure for Calculating the Gross Salary Income + Individual Salary Sheet for Print + Automatic HRA Calculation + Automatic Arrears Relief Calculator with form 10E + Automatic Form 16 Part B and Automatic Form 16 Part A&B all are in a single file, just fill the Data in Data sheet and Salary Sheet, the all of above calculation made automatically and after calculating the all you can Save the Same or You can Print the all Papers for submitting your Employer or Employee.