Saswata da,
Rectify me if I am wrong... Net salary can be lower than take-home salary. I am saying this from my practical experience as a management professional, competent in laws, accounting, and financial audits.
For example, if someone has asked management to deduct more in the PF account contribution, then funds MAY BE transferred from basic into the PF account, thus making the net salary lower than the basic.
Again, suppose there is some item of salary for which management has done TAX DEDUCTION at the source, then the net salary may become lower than the gross.
Many loopholes are there. I think we should advise the guy to provide the details of the PAY SLIP so that we can give a concrete reply. Alternatively, we can advise the guy to meet a Chartered Accountant or Company Secretary in practice, provide him with details of his salary for a minimum of 1 year, and then request him to provide a certificate of his analysis. Thus, if there is any mistake, the CA/CS can detect and point it out, and the certificate must be ratified by the membership number of CA/CS with ICAI/ICSI and signature.
An experienced auditor knows what to write in such a certificate. I hope you understood.
And I am pretty sure HR can't challenge a qualified auditor without a valid reason(s). Thus, either explain the payslip to the employee or accept the ratified certificate of a qualified CA. A Gentleman's solution.
Thanks and Regards,
Sovik B