What Is Petty Cash and How to Record It

Step 1: What is Petty Cash and Where Does It Sit in Your Accounts

Petty cash refers to a small, fixed reserve of physical cash set aside for minor business expenses. The amounts are too small to justify a bank transfer or card payment each time.

The fund runs on the imprest petty cash system. You spend from it, then restore it to its original balance when you replenish. For most small businesses, a float of £50 to £200 covers a typical week’s minor purchases. The float is not an expense. It is cash moved from the Bank into the fund when you set it up.

Is Petty Cash an Asset?

Yes. Petty cash is a current asset. It sits on the balance sheet under cash and cash equivalents, with a value equal to the float amount you have set. It is not a revenue account or an expense account.

Expenses are only recorded in the general ledger when you replenish the fund, not when cash leaves the tin. The Petty Cash account balance stays fixed at the float amount for as long as the fund exists. It changes only if you decide to increase or reduce the float.

Step 2: Setting Up the Fund in Your Books

When you set up the fund, the journal entry is:

Debit: Petty Cash (current asset account)

Credit: Bank

This moves cash from your bank account into the petty cash account in the general ledger. In bookkeeping software, record the initial float as a transfer between accounts, not as an expense. From this point, the Petty Cash account balance does not move when you make payments from the tin. All expense entries happen at replenishment, not at the point of payment.

The Most Common Setup Mistake

Many small business owners code the opening bank transfer straight to a “sundry expenses” nominal and never create a Petty Cash asset account. The result: the float disappears into the profit and loss account on day one, the balance sheet understates cash by the float amount, and there is no account to reconcile against at month-end.

Step 3: Recording Transactions as They Happen

Keep the Petty Cash Book

Attach a receipt or signed voucher to every payment before cash leaves the tin. HMRC has no minimum threshold below which documentation is optional. Log each transaction in a petty cash book with the date, payee name, amount, description, and expense category. Keep a running balance column so the float level is always visible.

If you are VAT-registered, record the gross amount and VAT element separately. Simplified VAT receipts are acceptable for input tax reclaim where the VAT-inclusive total is below £250, provided the receipt shows the supplier’s VAT registration number.

What the Petty Cash Book Is Not

The petty cash book is a subsidiary record of the fund’s movements. Expense entries do not reach the general ledger here. They are entered in the general ledger only at replenishment. The petty cash book and the general ledger are separate records, and this distinction is absent from most guides on the subject.

Write specific descriptions for every entry. “Miscellaneous” will not survive an HMRC enquiry. Record what was purchased, who it was paid to, and why it qualified as a legitimate business cost.

Step 4: Replenishing the Fund and Posting the Correct Entries

The Replenishment Journal Entry

When the float runs low, transfer the exact amount spent from the business bank account to restore it to the starting balance. The journal entry is:

Debit: Individual expense accounts (stationery, postage, travel, cleaning, etc.)

Credit: Bank

The Petty Cash account is not involved. Its balance does not change. Do not post the replenishment as a single “cash” or “sundry” entry. Coding the entire amount to a single nominal account hides actual petty cash expenses and produces inaccurate profit-and-loss figures.

Step 5: Petty Cash and MTD for Income Tax

Digital Records Apply to Every Petty Cash Payment

MTD for Income Tax applies from 6 April 2026 for sole traders and landlords with qualifying income above £50,000, reducing to £30,000 from April 2027 and £20,000 from April 2028.

Every petty cash payment must be recorded digitally with the date, amount, and expense category. Petty cash is not exempt from digital record-keeping obligations.

Limited companies must retain petty cash receipts and vouchers for 6 years. Sole traders must keep records for 5 years after the 31 January self-assessment deadline.

Wrapping Up

Petty cash is straightforward when handled correctly. It is a current asset with a fixed float and a clear process for recording expenses.

Most issues come from three mistakes. Recording the float as an expense, failing to create a proper asset account, and grouping expenses incorrectly at replenishment.

Correct these early, and reconciliation becomes simple. Leave them unchecked, and small errors build into larger reporting problems.

Want to keep your records accurate and avoid small errors turning into bigger issues?

Let Acxite help your team manage transactions, track records, and maintain clean bookkeeping from the start.

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