Swiss Invoice Template: 7 Required Fields That Are Often Missing

An invoice that doesn't hold up legally can prove expensive: the recipient refuses the input tax deduction, the tax office challenges the document, or payment never arrives because banking details are missing. Most problems don't arise from ignorance of the basics, but from details that slip through the cracks when creating a template. This article focuses on the seven fields most frequently omitted in practice — and explains what that actually means.

What Swiss law requires

The foundation is the VAT Act (MWSTG) in conjunction with ESTV VAT Information Note 16. Any business required to register for VAT must include certain minimum details on every outgoing invoice so the recipient can claim input tax. For businesses not required to register for VAT (annual turnover under CHF 100,000), fewer requirements apply, but correct basic information is still essential for bookkeeping.

A complete overview of all mandatory fields — including special cases for small businesses — is available in the practical guide to invoicing as a freelancer in Switzerland.

The 7 fields that are often missing

1. Your own VAT number

This seems obvious, yet surprises many in older templates or among founders who've just registered their business. Format: CHE-123.456.789 VAT. Without this number, the recipient cannot claim input tax — regardless of whether the tax was calculated correctly.

2. Complete recipient address

Many templates have a "customer" field containing only the company name. However, ESTV requires the full address of the service recipient. For business customers, the UID (Business Identification Number) should also be provided if known — this simplifies accounting on both sides.

3. Performance date or performance period

The invoice date and the date the service was delivered are two different things. VAT is calculated based on the service delivery date, not the invoice date. If you invoice in December but delivered the service in November, you must explicitly state the service month. Missing the performance date can result in the recipient's input tax being reviewed or denied.

4. Clear description of services or goods

"Various services" or "Consulting October" is insufficient. The invoice must describe the nature and scope of the delivery or service so that a third party — such as an accountant or enforcement officer — can understand what was invoiced. Minimum standard: what was delivered or done, in what quantity or duration, at what unit price.

5. Applicable VAT rate per line item

Switzerland has had three rates since 2024: 8.1% (standard rate), 2.6% (special rate for accommodation), and 3.8% (reduced rate for food, books, etc.). If you combine different services on one invoice — say, medicines and consulting services — you must show the VAT rate per line, not just the total. A single line "VAT 8.1% CHF 45.50" at the bottom is only acceptable if all items use the same rate.

For current rates and which services fall into which category, Swiss VAT basics 2026 provides the latest overview.

6. QR-IBAN instead of standard IBAN (for QR-bills)

Since the replacement of the payment slip, QR-IBAN is mandatory for invoices with the Swiss QR code. A standard IBAN doesn't technically work with the QR code standard. If you simply copy your IBAN without checking whether your bank has issued a separate QR-IBAN, you risk failed payments and manual rework. The QR-IBAN always begins with "CH" followed by a different check digit than your regular IBAN. Detailed guidance can be found in the article on QR-bill mandatory fields and common errors.

7. Unique invoice number

Not just any number — one that is sequential and never reused. Many templates start with "Invoice 1" or "INV-001" and are then saved in different folders, leading to duplicates. A consistent format like "YYYY-MM-NNNN" (e.g., 2026-08-0047) makes the sequence immediately visible and simplifies audit reviews.

Quick checklist: essential fields at a glance

Field	VAT-registered	Not VAT-registered
Your name / company, address	✓	✓
Recipient name, address	✓	✓
Unique invoice number	✓	✓
Invoice date	✓	✓
Performance date / period	✓	recommended
Service/goods description	✓	✓
Quantity and price per line	✓	✓
VAT rate per line	✓	—
VAT amount	✓	—
Your VAT number	✓	—
Payment terms	recommended	recommended
IBAN or QR-IBAN	✓	✓

What happens when fields are missing?

It depends on who reviews the invoice:

• At the recipient: If your VAT number or tax rate is missing, the recipient loses the right to claim input tax. They will either request a correction or reject the invoice.
• During a ESTV audit: In a VAT review, incorrect outgoing invoices can lead to reassessment — for the company that issued the invoice.
• In debt collection proceedings: An invoice without a clear service description and number is harder to prove before the enforcement office. It's not a knockout, but an unnecessary complication.

If you want to set up or clean up your template, you can build a compliant template directly in the SnapBill app — all mandatory fields are already structurally provided.

Special cases affecting your template

Small businesses not required to register for VAT should not show VAT on the invoice — not even as "included" or as a note. If you do, you still owe the stated tax to ESTV (Article 27 MWSTG). This is a common mistake for new ventures.

For invoices in foreign currency, the CHF equivalent must be stated either per line or as a total amount if VAT is remitted in CHF.

At a glance

• The seven frequently missing fields are: VAT number, complete recipient address, performance date, clear service description, VAT rate per line, QR-IBAN (for QR-bills), and unique invoice number.
• Missing mandatory fields can jeopardize the recipient's input tax claim and lead to reassessments in ESTV reviews.
• Businesses not required to register for VAT must fill in fewer fields but must never show VAT.
• Consistent numbering and the performance date are the two fields most commonly overlooked.
• A current, correct template is not extra work — it protects you from real financial consequences.

The SnapBill homepage offers a quick way to create a legally compliant invoice directly in your browser, without maintaining your own template.