13 June 2014
actually the whole term is "law for the time being in force"
it means the law as it stood at the particular point of time. For eg: as at 31 March 2013 the limit for premium paid on insurance policy under section 80C of the Income tax act 2013 was 20%. after this date the percentage was reduced to 10%. so will say as per the law for the time being in force, the premium paid at 20% was valid.