Please do your ground work completely and send query with full facts and details. Under what circumastances payment by way of a/c payee cheque or DD was not possible? why cash was deposited instead of cheque? These to be enquired and reasonable cause for deposit in cash is to be established.Holidays of clearing on the same day or next day or delay in clearing causing hardship could be reasonabe causes. Payment in cash to prompt delivery/ despatch of urgent material or to meet some urgency at payyes end could be good grounds. Deposit in cash in a/c of payee is equal to cash payment to which S. 40A (3) apply. You may refer to K. Abdu & Co. V Income-tax Officer, Ward-3, Cannanore 170 Taxman 297.