Service Invoice Template: Mandatory Fields That Are Often Missing

Anyone providing a service — whether as a web designer, consultant, or trades business — creates invoices differently from someone selling physical goods. Yet many SMEs and freelancers simply use whatever template they find first. The result: invoices that customers cannot process internally, that get excluded from VAT accounting, or that are worthless in a dispute.

This article shows which fields are mandatory on a service invoice in Switzerland, which ones are frequently forgotten — and why the service date is so much more critical for service providers than for goods traders.

Why Service Invoices Have Special Requirements

With goods, there's a delivery quantity, a unit price, and the transition is clear: the goods leave the warehouse. With services, the work is often invisible, spread over time, or hard to define. This creates specific risks:

• Disputes over scope and acceptance: Without a precise description, the customer has room to challenge the invoice.
• VAT accounting errors: The tax point for services usually occurs when the service is performed, not when the invoice is issued — a difference that can be expensive at year-end.
• Input VAT deduction for the recipient: If a mandatory field is missing, the invoice recipient cannot claim input VAT. They will send the invoice back.

The Legal Minimum Information — In Brief

Swiss VAT law (Art. 26 VATL) requires the following information on invoices relevant to input VAT:

Field	Explanation
Name and address of the service provider	Complete details, as in the commercial register or letterhead
Name and address of the service recipient	Customer's invoice address
Invoice date	Date of issuance
Service date or service period	When was the service performed?
Service description	Specific enough to identify the service
Amount	Sum without VAT, tax rate, tax amount, total amount
VAT number	Format: CHE-123.456.789 VAT

Invoices under CHF 400 (incl. VAT) are exempt from some of these requirements — but this is rarely relevant in practice.

The Three Fields Service Providers Most Often Forget

1. The Service Date — Not the Invoice Date

The invoice date is the day you issue the invoice. The service date is the day (or period) when you performed the work. Both can be identical — but they don't have to be.

For VAT accounting purposes, the service date is decisive: it determines which accounting period the tax falls into. If you provide a consulting service in December and don't issue the invoice until January, you should clearly show the period "December 2025" on the invoice. More on this distinction can be found in the article Service Date vs. Invoice Date: Freelancer Mistakes to Avoid.

2. The Service Description — Specific Rather Than Generic

"Consulting services October 2026" often isn't enough. A credible description includes:

• What was done (concept, implementation, support)?
• For which project or department?
• On what basis (hourly rate, flat fee, framework agreement)?

Example of a weak description: "Services as per agreement – CHF 3,200.00"

Example of a credible description: "Strategy consulting for digitalization project 'ERP Migration', 16 hours at CHF 200.00, per quote no. 2026-045 of 15.09.2026 – CHF 3,200.00 excl. VAT"

3. The Correct VAT Rate for Your Industry

The standard rate is 8.1%. However, special rules apply to certain services: accommodation (3.8%), and a few services fall under the reduced rate of 2.6% (e.g., cultural events). Some services are VAT-exempt, with no tax shown — for example, many healthcare and education services.

A comprehensive overview of rates and exceptions is provided in the article Swiss VAT Basics 2026 — Rates, Duties and Special Rules.

Additional Useful Information for Service Invoices

Not legally required, but valuable in practice:

• Payment terms: "Net 30 days" or specific date. Without a payment term, Swiss law assumes immediate payment — which is rarely what either party intends.
• Reference number (QR-bill): If you work with a QR-IBAN, you assign a structured reference number. This makes automatic assignment at your bank much easier. The steps are described in the article Create a Swiss QR-Bill — Step-by-Step Guide.
• Your bank details / QR code: For payment by bank transfer or eBill.
• Customer project reference or purchase order number: Many companies cannot process an invoice without their internal PO number.

Checklist Before Sending

Go through these points before you click "Send":

• Complete name and address of my business?
• Complete invoice address of the customer (including UID number if B2B)?
• Invoice date set?
• Service date or service period clearly stated?
• Service description specific enough?
• Amount excl. VAT, tax rate, tax amount, and total amount shown?
• VAT number in correct format (CHE-XXX.XXX.XXX VAT)?
• Payment terms and bank details provided?
• Invoice number sequential and unique?

If you want to create the invoice directly digitally, you can use the SnapBill app — it guides you through all mandatory fields and generates a compliant QR-bill.

At a Glance

• Service invoices need a service date, not just an invoice date — this is VAT-relevant.
• The service description must be specific enough so the customer can book it and claim input VAT.
• Check the VAT rate: Not all services fall under 8.1% — and some are completely exempt.
• Customer purchase order number belongs on the invoice if the customer requires it — otherwise payment delays due to internal processing obstacles threaten.
• A complete invoice is not just a legal requirement — it protects you in disputes over the scope and acceptance of services.