No, you don't get a 100% credit for VAT against your income taxes; the credit only exists as an offset against your VAT payable liability.
If for some reason you can't offset your input VAT, then you get the same deduction against your income as you would for a sales tax, because it's part of your expenses. BUT NOTE: that if the acquired good is depreciated, then in both cases (VAT or sales tax) the tax-related deduction is spread over several years rather than all at once.
Sorry, I didn't mean to imply that you get a 100% credit against income taxes, only that you get a 100% credit. (The comment to which I replied seemed to think that GP's point - that sales tax can be deducted from income for income tax purposes - was equivalent to a credit for input VAT, which it's not.)
If for some reason you can't offset your input VAT, then you get the same deduction against your income as you would for a sales tax, because it's part of your expenses. BUT NOTE: that if the acquired good is depreciated, then in both cases (VAT or sales tax) the tax-related deduction is spread over several years rather than all at once.