Hi Shabina,
Let me a give you an idea of break-up for any CTC assigned to employee
Usually we Take :
Basic salary : 50% of CTC (No thumb rule)
HRA : 50% of Basic salary for "A" class cities & 40% for "B" class cities P.S. cities under minimum wages act
Conveyance : if a person's gross amount already shows that its "taxable" you can't manipulate it abruptly to make it non-taxable.i.e. try to fix
conveyance in the ratio of tax slab ( for non-taxable amount keep it <=800 per month,9600 is tax-free amount)
Rest of the amount should be adjusted accordingly in heads of Medical allowances,Education Allowances, Special Allowances etc.
You can reduce the net salary amount by bifurcating the part into Gratuity,Bonus & Earned leaves per months but more or less its a kind of malpractice & I won't advocate it.
Note : try to keep the amount of Basic salary in such a way that it won't cost too much in terms of contributions under various Labour acts.
i.e. EPF,Bonus,Gratuity etc.
I hope this could give you a better idea what sorts of point should be taken into keen consideration while preparing a salary break-ups.
Regards,
Manish Gupta