Petty Cash and the Imprest System

How the imprest system works

A fixed amount — say ₹5,000 — is set aside as the float. Small expenses are paid out of it, each recorded with a voucher and, wherever possible, a receipt.

When the float runs low it is topped back up to exactly its original fixed amount, by reimbursing exactly what was spent — never more, never less. The float itself never grows or shrinks. Only the cash physically inside it moves.

The replenishment calculation

Float opened the month at ₹5,000. By month end ₹3,650 has been spent across various vouchers, leaving ₹1,350 physically in the box.

Replenishment is exactly the gap: ₹5,000 − ₹1,350 = ₹3,650 — precisely what was spent, restoring the float to ₹5,000. Never rounded up, never padded to a convenient figure.

Posting it — and what stays untouched

Debit each relevant expense account for its category of spending — say ₹1,200 to Courier & Postage and ₹2,450 to Staff Welfare and Miscellaneous — and credit Bank ₹3,650, the cash drawn to top the float back up.

Notice what is missing: the Petty Cash account itself is not in this entry. It sits at ₹5,000 throughout. That is the imprest principle expressed in the ledger — if the petty cash balance is moving every month, the system is not being run as an imprest at all.

When the count doesn’t agree

Month-end count finds ₹1,200 in the box, but vouchers account for only ₹3,700 of spending against the ₹5,000 float — ₹100 unexplained. Round the replenishment so it comes out even?

Never. The ₹100 is recorded honestly as a Cash Shortage, investigated — was a voucher simply lost, or is this a real discrepancy? — and written off only once genuinely unexplainable. Plugging it into the replenishment figure makes the count look clean and destroys the only signal you had.

It is the same discipline that applies to any reconciliation: never force a balance to tie.

Small does not mean lax

The common assumption is that because each transaction is small, it needs less rigour than a supplier invoice. It doesn’t. Every voucher should state what was bought, why, and by whom, supported by a receipt wherever one is reasonably available.

Undocumented cash spending multiplied across many transactions and many months is one of the easiest ways money leaks from a business — precisely because each individual amount feels too small to question.

Why physical cash carries its own risk

Unlike a bank transfer, cash leaves no independent third-party record of where it went once it changes hands. There is no statement line confirming the recipient.

So custody belongs to one specific, accountable person; the box is counted and reconciled regularly; and the float stays limited to genuinely small, incidental expenses. It should never become a workaround for a payment that belongs in the normal accounts payable process.

Common mistakes

• —Replenishing to a round number rather than to exactly the amount spent.
• —Debiting Petty Cash on replenishment, so the float balance drifts.
• —Absorbing a shortfall into the top-up instead of recording and investigating it.
• —Accepting vouchers with no description of what was bought or why.
• —Routing a payment through petty cash to avoid the approval the AP process would require.
• —Leaving custody shared across a team, so no one is accountable for the count.