Dear Anuja,
If your company mentions CTC in the offer letter, that includes the employer's contribution for PF and also for ESI (if applicable). Salary breaks vary. Basic, HRA, CCA, CA... there will be a percentage on these items and will be calculated from the gross salary.
i.e. gross salary = CTC - employer's Contribution for PF - employer's contribution for ESI (if applicable)
-> P.F contribution of both the employee and employer is 12% of the basic.
For example, in some companies, they would have 55% as Basic, 20% as HRA, 15% as CCA, and 10% as CA. (this is calculated from your gross).
Later on, your deductions will come like {PT (Professional Tax), income tax if applicable, or if any loan is given to the employees}.
Net payable = gross salary - total deduction.
If your company mentions Gross in the offer letter, it does not include the employer's contribution for P.F and ESI (if applicable). You need to add the employer's contribution separately while deducting PF from the employee and sending it to the PF office.
Hope this information will help you.