Cancel or Correct an Advance Invoice: Step-by-Step Guide for Switzerland

An advance invoice is quickly issued—but what happens when it contains errors? Wrong amount, incorrect VAT rate, or the job specification changed after the deposit was paid: in practice, it's common for an issued advance invoice to need adjustment later. Careless handling risks accounting discrepancies and VAT settlement problems.

When does an advance invoice actually need correction?

Not every inaccuracy requires a formal reversal note. As long as the invoice hasn't been paid and no booking has occurred, a simple new version marked "Replaces version of [date]" often suffices. However, once the deposit has been received or the invoice has been processed in the accounting system, you'll need a proper correction procedure.

Typical reasons for correction:

• Wrong amount: The agreed deposit percentage was calculated incorrectly (e.g., 30% instead of 40% of the contract value).
• Wrong VAT: Incorrect tax rate applied—for instance, 8.1% instead of 2.6% for a mixed job.
• Wrong recipient: Invoice address or customer UID number is incorrect.
• Job specification changed: The scope of work changed before completion, and the deposit amount no longer fits.
• Job cancelled: The contract is wound down, and the deposit must be refunded.

Two approaches: reversal note or credit memo?

In Swiss accounting, these terms are often mixed up. In practice, two instruments matter:

Reversal note (complete reversal)

A reversal note cancels the original advance invoice entirely. It contains the same amount as the original invoice but with a negative sign and explicitly references the original invoice number. Afterwards—if necessary—you issue a new, corrected advance invoice.

When useful: The job is cancelled, or the errors are so fundamental that a partial correction makes no sense.

Credit memo (partial adjustment)

A credit memo adjusts only the difference. For example, if you invoiced CHF 5,000 but should have invoiced only CHF 4,200, you issue a credit memo for CHF 800.

When useful: Only the amount is slightly wrong; all other details are correct.

Situation	Recommended Action
Wrong tax rate	Complete reversal note + new invoice
Amount slightly too high	Credit memo for the difference
Job cancelled, refund required	Reversal note + refund documentation
Wrong recipient	Complete reversal note + new invoice

VAT: what to watch for when reversing

VAT treatment is the trickiest part. Since advance invoices in Switzerland are treated as deposits for tax purposes, VAT liability arises at the moment of invoice issue (under the accrual method) or upon payment receipt. When you reverse an advance invoice, you must correct the corresponding VAT in the same or next VAT settlement period.

Concretely: you issued an advance invoice for CHF 10,000 plus 8.1% VAT (= CHF 810) in March and declared it in your Q1 settlement. You reverse the invoice in April. Then you post a correction of CHF –810 to the VAT account in Q2. The net amount and tax appear with a minus sign in your settlement to the Swiss Federal Tax Administration (ESTV).

A detailed explanation of the booking logic—including the correct account codes in the SME chart of accounts—can be found in our guide to VAT-compliant accounting for advance invoices in Switzerland.

Mandatory fields on a reversal note

A reversal note is legally a standalone document. It must contain the same required fields as any Swiss invoice:

• Clear designation as "Reversal Invoice" or "Credit Note"
• Unique document number (its own number, not the same as the original)
• Reference to the reversed invoice number and original date
• Negative amount (or explicit minus notation)
• VAT shown with negative sign
• Your UID number (if VAT-registered)
• Issue date

Without a reference to the original invoice, the document may be considered incomplete during an ESTV audit or review by your accountant.

Step by step: reversing an advance invoice correctly

1. Assign a document number: Give the reversal note a new, sequential number from your invoice series.
2. Reference the original: "Reversal of invoice no. 2026-047 dated 15.05.2026".
3. Show amounts as negative: Net amount, VAT, and gross amount all with minus signs.
4. Adjust the booking: Reverse entries to the receivables account and VAT account accordingly.
5. Document the refund: If already paid, process the refund promptly and link it to the reversal note.
6. Issue a new advance invoice: If the job continues, issue the corrected version now.

If you create your advance invoices digitally and manage reversal documents in the same system, you save steps. With the SnapBill app, you can issue invoices and correction documents with a QR-bill and maintain consistent numbering sequences.

Refunds: what applies to payment

If you must refund a deposit already received (for example, after job cancellation), transfer the amount to the same account from which the payment arrived. Document the refund using the reversal note as the payment reason. For larger amounts, it's advisable to prepare a brief written record—not for accounting purposes, but in case the former customer later disputes the refund.

Note: if you must calculate late-payment interest on a wrongfully retained deposit, the same deadlines apply as for regular invoices.

At a glance

• Not yet paid or booked: A corrected version with a note often suffices.
• Already paid or booked: A reversal note with its own number and reference to the original is mandatory.
• VAT correction: Make it in the same or next settlement period—show as a negative amount in your ESTV return.
• Credit memo: Only for partial amount corrections; for a wrong tax rate, reverse completely and reissue.
• Mandatory fields: A reversal note needs all standard invoice details plus an explicit reference to the reversed invoice.
• Refund: Transfer promptly to the original account and document it with the reversal note.