as per sec 40A(3) " Disallowance of cash expenditure" A payment or Aggregate payments for expenditure, otherwise than by way of A/c payee cheque or draft or A/c clearing system to A person in a single day, more than 10,000 such expenditure Shall not be allowed under income tax. Before budget of 2017-18 the limit was 20,000 and it was reduced to 10,000.