Friend
All employees are to be covered under all labour laws, irrespective of how you pay and how you try to hide such payment. In fact there is no category called "Voucher Paid employee". What you mean by voucher payment appears to those who are not brought in wage register or muster roll. Not covering them under ESI/EPF etc is violation of law and also criminal offense but also violation of Payment of wages act, fact act/rules and various other laws. It is true that often you may have to engage a person for a day or two or even few hours, and you may not include them in the Permanent employees register, but you need to have separate register for "Temporary/Casual and Badli workers", indicating their wages, period of work etc and need to comply under ESI/EPF.
I do not agree with kknair that there are Court judgment saying that such employees need not be covered. Majority of judgement of Supreme Court and High courts emphatically stated that all workers, whether employed as casual, temporary or through contract need to be covered under ESI and EPF. In fact he may be referring to a particular case where court talked about "birds of passage", which is not the law laid down. Please remember that accidents (which may result in death or permanent disability) is not based on seniority or manner of payment of wage and can happen to any one at any time and you cant just throw out the body of a victim outside the gate. In fact more accident happens to untrained, insecure casual workers.
O Abdul Hameed
Formerly Addl.Commissioner ESIC
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