13 June 2014
there is no limit and that is not allowed and if u book and found without any supprtings then its a case of fraud and income tax authorities can penalise you.
13 June 2014
if there is no supporting available then you cant do much but it must be reasonable that a person of sound mind can think of.
for petrol u can keep the payment reciept given, travellling by bus u can have tickets,same for railways.......so in short wherever possible u must keep.