Cash Book for Swiss SMEs: Avoid Errors and Maintain It Correctly

Many small Swiss businesses underestimate the cash book until the auditor or tax authority asks questions. Yet the most common errors are no secret: missing receipts for cash expenses, negative cash balances, or private withdrawals recorded nowhere. This article shows you how to maintain a legally compliant cash book — without significant extra effort.

What Swiss law requires from your cash book

The Swiss Code of Obligations (CO Art. 957 ff.) requires all businesses subject to accounting obligations to record all business transactions completely, truthfully and systematically. For cash movements, this specifically means:

• Daily recording: Every cash receipt and cash payment must be entered on the transaction date or at the latest the following day.
• Receipt requirement: Every entry requires supporting documentation — a receipt, till slip or a self-created internal voucher.
• No negative cash balance: A cash balance can never fall below zero in the accounting records. A negative balance indicates errors or missing entries.
• Reconciliation: The cash balance in the book must match the physical cash on hand at all times.

For sole proprietors with annual turnover under CHF 500,000, simplified accounting (cash-basis accounting) applies, yet even here cash transactions must be fully documented.

The most common errors — and their consequences

1. Private withdrawals without recording

A business owner takes CHF 200 from the till for personal shopping and forgets to note it. The cash book no longer balances at the end of the day. At year-end, an unexplained difference arises.

Consequence: The tax authority may treat such discrepancies as concealed profit or undeclared income — resulting in back taxes.

Solution: Record private withdrawals immediately as "private account / capital withdrawal" and create an internal voucher.

2. Collective entries instead of individual postings

"Miscellaneous income, CHF 850" is not a proper entry. Each payment needs its own line with date, amount, counterparty and description.

Consequence: During a VAT audit, it becomes impossible to verify whether the 8.1% was correctly applied to all items — the tax authority may resort to estimation, leading to reassessment.

3. Expenses without supporting documents

If you quickly drive to a supplier and pay CHF 47 in cash but don't take a receipt, you have a problem. Without documentation, the expense is not tax-deductible.

Solution: Create internal vouchers. Date, amount, purpose, service provider — that's sufficient. A handwritten voucher is better than no voucher at all.

4. VAT errors with cash receipts

If you are VAT-registered, you must show the correct tax rate even for cash receipts. For restaurants, for example, the reduced rate of 3.8% applies to takeaway meals, but 8.1% to restaurant consumption. Applying a flat rate risks overpayments. A comprehensive overview of all valid Swiss VAT rates and special rules for 2026 helps you allocate the correct rates.

5. Missing daily reconciliation

The cash book is only updated once a week. By Friday, receipts from Monday are missing, amounts are estimates — and the cash balance no longer matches the physical count.

Solution: Introduce a daily close-out procedure: count the cash, compare it with the book balance, and resolve discrepancies immediately.

Cash book digital or on paper?

The CO permits both, provided the 10-year retention requirement is met. Digital cash books must be archived immutably or maintained with a traceable change log.

Option	Advantage	Disadvantage
Excel spreadsheet	Flexible, free	No access control, easily manipulated
Accounting software	Audit-proof, VAT verification integrated	Ongoing costs
Paper cash book	Simple, no IT effort	Tedious analysis, loss risk

For smaller businesses with few daily cash transactions, a well-structured Excel template with password protection and regular backups is perfectly acceptable — provided original receipts are kept physically.

Linking your cash book to VAT reporting

If you use the actual VAT method, cash receipts must be divided by tax rate. Your cash book should therefore include columns for each applicable rate:

• Standard rate 8.1%
• Reduced rate 3.8% (accommodation)
• Reduced rate 2.6% (food, books, etc.)
• VAT-exempt income

This way, at quarter-end you can derive your VAT return directly from the cash book — without tedious recalculations.

Observe the cash payment threshold

Under the Swiss Money Laundering Act (AMLA), traders face a cash payment limit of CHF 15,000 per transaction if the customer is not identified. If this threshold is exceeded, you must identify and record the customer's details. This particularly affects sectors such as watches and jewellery, real estate and vehicle trading.

Record retention

Cash books and all supporting documents must be kept for 10 years (CO Art. 958f). The retention period begins at the end of the business year to which the documents relate. Digital copies of paper receipts are only recognised as replacements if they are complete, legible and stored immutably.

When do I not need a cash book entry?

Not every cash movement requires a separate cash book entry:

• Pass-through items: If you pay cash on behalf of a customer and bill it one-for-one, the money flows through a debtor/creditor account instead.
• Advances for expenses: If employees receive an advance and settle later, the advance is a receivable, not an expense.

In both cases, the supporting documents still belong in your accounting records — they simply go through a different account.

At a glance

• Maintain your cash book daily and reconcile the balance daily.
• Every entry needs supporting documentation — create an internal voucher if necessary.
• Record private withdrawals immediately as capital withdrawals.
• Assign VAT rates correctly to each receipt; avoid collective entries.
• The 10-year retention requirement applies to digital cash books too.
• A negative cash balance is a red flag and must be cleared immediately.
• For cash payments of CHF 15,000 or more, record customer details (AMLA).

If you apply these basic rules consistently, you'll avoid stress during the next VAT audit and have a clean statement for your accountant. For all sales invoices matching your cash receipts, you can use SnapBill to create compliant Swiss invoices directly with the QR payment section.