If such service tax is payable on the business income, then there wont be any effect on Income tax liability.
Secondly if is payable under Reverse or Partial reverse charge method, then such tax amount will be added back to Profit/loss calculated.
Extracts of 43B As per Section 43B Notwithstanding anything contained in any other provision of this Act*, a deduction Sudame otherwise allowable under this Act in respect of— a)any sum payable by the assessee by way of tax, duty, cess or fee, (by whatever name called, under any law for the time being in force);