Verification: Tax laws can be subject to specific notifications based on your exact business model. It is recommended to check the invoice provided by the contractor, as they are responsible for correctly identifying the SAC/HSN code and applying the appropriate rate.
Professional Advice: If you are a business owner registering these expenses, consult your tax advisor or CA to determine if your specific arrangement qualifies as "job work" or a "composite supply," as this affects your ability to claim Input Tax Credit (ITC).