Deduction made from contractor's bill on account of amount being receivable upon there being no defect during stipulated period shall not be included in his income although he is following mercantile system . Held by Andhra Pradesh High Court in Shankar Constructions . ITA 135/2004. High Court discussed the principles propounded by Supreme Court inCIT v. Shoorji Vallabhdas & Co. [1962] 46 ITR 144 (SC) , CIT v. A. Gajapathy Naidu [1964] 53 ITR 114 (SC) .