Such a requirement should be expressed in writing. The parties may agree to register order a refund. Though the whole sum at once, or at least parts. 6. Provide for interest on the amount of money held and penalties for not returning money to date as agreed between the parties. By decision of the parties to the receipt can establish and to register interest on the amount held in cash and also penalties for not returning money on time. If money is take an interest-free, then the receipt must necessarily it is written “is considered to be interest free, otherwise it is considered interest.