S. 145 : Method of accounting – offering of income and allowability of expenses – Assessee floated a scheme wherein it received money in first year and the payment to the subscribers were to flow in subsequent years – held, taxing of income in first year and allowability of expenses in subsequent years based on cash system presented a skewed picture – Held, method of accounting should be such which does not affect the interest of the Revenue and at the same time should not put the assessee in undue hardship. Held, mercantile system to be followed.[ S.4 ]