The Statutory compliance regarding EPF and ESI is the responsibility of the Principal employer. In case if the contractor failed to pay, you have to make he payment and you can recover from the bills of the concerned contractors.
Initially while engaging the contractors, you must collect the PF Registration papers from your respective contractors and every month you must collect the Form 5, Form 10, and Monthly PF Remittance Challan, alongwith the Paysheet of all the workers engaged in your workplace.
Please make sure, the Paysheet must talley with the PF and ESI Remittance Challans (for names, PF No, ESI No, Basic Amount (for PF) and total amount (for ESI) and deduction details).
Then you need not to worry about the compliance.
26th May 2012 From India, Kumbakonam
Apart from the above reply, make a practice that all the contractors engaged with your organisation submit their duly signed Wage register, PF & ESIC Challan, PT & an under taking letter along with their monthly bills / Invoice.
Please make sure you compare the employee deduction amount with challan remitted amount.
This practice will help you for proper monitoring of Contract Labour Statutory compliance.
Thanks & Regards,
20th August 2012