To calculate your tax liability, you should provide following data in details :
1. Exemption of HRA is available subject to condition that you are residing in a rented house. So, if you are residing in a rented house, than the total rent paid during the year.
2. If you have paid/ employer has deducted the employment tax (popularly known as "Professional Tax"), the amount thereof? (The professional tax qualifies for deduction from Salary U/s 16(iii)).
3. If you are regular employee, the employer would be deducting the GPF. so the amount thereof? (The contribution by you to GPF qualifies for deduction U/s 80C).

So, for computaion of correct tax liability, provide the above data.