Hi,
The normal practice is to calculate PF as 12% of basic salary. However, this is only the employer's contribution. Another 12% is deducted as the employee's contribution. So the total is 24%.
As far as I know, there is no maximum limit. For example, if an employee has a basic salary of Rs. 50,000 per month, then 12% comes to Rs. 6,000. Hence, the total amount deducted would be Rs. 12,000.
Thanks and Regards,
Karan