TDS Calculation on VAT able amount

Hello,

I have a requirement from my client. Scenario is as per below:

Base amount : 125000

VAT amount : 15625

Now, I want to calculate the TDS amount on (125000+15625) =1 40625.

Which is possible in case of only Service Tax but not in case of Sales Tax.

How to handle this scenario?

Regards,

Rahul