PF contributions are calculated as 12% of all fixed wages (except HRA). The fixed wages are currently capped at Rs 15,000, and thus the maximum contribution calculated by Opfin is 12% of 15,000 = Rs 1,800.
There is a common misconception that PF is calculated only on basic salary. This is incorrect, and there was a Supreme Court ruling on this matter in 2019. Opfin will not calculate PF only on basic salary, since this is now against regulations.
The employer's PF contribution can be higher by 1%, depending on whether the employer chooses to include the EDLI and admin charges or not.