Income from insurance commission should be taxable under head income from other sources , it will not be cover under bussiness and profession since it is not backed by any special knowledge it is not a profession and also clearly it is not a bussiness .
for tax saving you can go for deduction under section 80C and rest basic exemption limit . say
income from commison = Rs325000
Less : deduction u/s80c = Rs 100000
Less : basic exemption limit = Rs 160000
balance amount taxable = Rs 65000
for which you can also avail deduction for section 80D , 80DD , 80DDB, Making your income nil and you will get refund of TDS as deducted by your company u/s194D.