It depends upon the nature of job work done by you. if it involved supply/use of material from your end then registration for VAT is required.
Further job work is a taxable service under service tax act, so liability for service tax arises when t/o exceeds to Rs 10 Lacs.
Note: 1. Turnover does not include material supplied by the J/W. 2. Declaration to Service Tax Dep't require when t/o exceeds to Rs 9 Lacs.
Hope this information is useful & suggest not to evade the tax liability as sooner or later it get disclosed which result not only in pymt of tax but also fine and interest.