Vat laws of respective states contains provisions of sales price, for example West Bengal VAT has following provision.
Sec 2(41)
"sale price" means the amount payable to a dealer or casual dealer as
valuable consideration for the sale, other than the sale referred to in
section 14, of any goods and includes ––
(a) any sum charged for anything done by the dealer or casual dealer in
respect of such goods at the time of delivery, or before delivery, of
such goods,
(b) any sum charged for freight, delivery, distribution, installation or
insurance, by such dealer at the time of delivery, or before delivery,
of such goods,
(c) any tax, duty or charges levied or leviable (other than the tax
charged separately under this Act, subject to the provision as
mentioned in the Explanation and cess levied under the West
Bengal Transport Infrastructure Development Fund Act, 2002), in
respect of such goods,
but does not include any sum allowed as cash discount, commission or
other commercial rebate on the value of such goods at the time of
delivery, or before delivery of such goods and interest if separately
charged.
Explanation.–– For the purpose of this clause, the expression "sale price"
of a dealer, enjoying payment of tax at a compounded rate under subsection
(3) of section 16 or sub-section (4) of section 18, or selling to any
person other than a dealer of goods upon which maximum retail price as
the referred to in clause (22 A) is applicable and where such maximum
retail price is inclusive of sales tax, shall include any tax payable under
this Act, including the tax referred to in section 10, or section 12;
You need to refer VAT Act of your state to get the idea of what is allowed as deduction
Most of the states allow deduction for Trade discount. Some of the state allow deduction for Quantity discount from sale price.
There is nothing called cost+Expenses+Profit in Vat on Sales Amt. These thing are relevant in taxation of Work Contracts (i.e contracts for a work where in transfer of property takes place like building contraction).
In case you need further clarification you can send your query at balaji_857 @ rediffmail.com
B RAO