Imprest system

The imprest system is a form of financial accounting system. The most common imprest system is the petty cash system. The base characteristic of an imprest system is that a fixed amount is reserved, which after a certain period of time or when circumstances require, because money was spent, it will be replenished. This replenishment will come from another account source, e.g., petty cash will be replenished by cashing a cheque drawn on a bank account.

Petty cash imprest system

Petty cash imprest system allows only the replenishment of the spend made. So, if one starts the month with $100 in one’s petty cash float and spend $90 of that cash in that month, an amount of $90 will be then placed in one’s petty cash float to bring the balance of the petty cash float back to $100. The replenishment is credited to the primary cash account, usually a bank account (Dr - Petty Cash a/c, Cr - Bank a/c) and the debits will go to the respective expenses account, based on the petty cash receipt dockets (Dr - Expense a/c, Cr - Petty Cash a/c)...


In this example the maximum amount of petty cash that can be issued (spent) is $100. The claimant may only spend what they have and is only replenished with what they spend, in this case $90.

In a non imprest system where a fixed amount is issued every month, e.g., $100 every time cash is required, there is no incentive to ensure all money issued has been documented because when money is all spent a check for a fixed amount is issued. It is much more difficult to reconcile a non imprest system as one never knows how much exactly should be in the float.

In an imprest system the amount requested is documented, the documentation being the petty cash dockets and their associated receipts or invoices. Therefore, at all times one can check how much should be left in the petty cash float by deducting the amount spent from the opening petty cash float.

How petty cash imprest system works

The imprest system ensures that one must document how the petty cash is spent. In a petty cash system, petty cash receipts are written for each amount issued. So, when all of these receipts are totalled at the end of the month and deducted from the opening petty cash float, the calculated value must agree with what is left in the petty cash float. Under the imprest system, only that which is recorded as spent is replenished. Any shortfalls might need to be replenished by the guardian, usually a bookkeeper, of the petty cash float from their own personal resources.

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