Section 33(iii) in The Central Government Account (Receipts and Payments) Rules, 1983
(iii)All bills must be filled in and signed in ink; entries and signature with ball point pens are also permissible provided the same are clear and legible. The amount of each bill should, as far as whole rupees are concerned be written in words as well as in figures. The fraction of a rupee may, however, be written in figures after the words stating the number of rupees, but in the event of there being no fraction of a rupee, the word 'only' must be inserted after the number of whole rupees and care should be taken to leave no space for interpolation as in the following examples 'Rupees twenty-six only' 'Rupees twenty-five and 25 paise'.
