Buchungsbeleg Switzerland: which documents actually count
When people search for Buchungsbeleg in Switzerland, they’re usually trying to solve a practical problem: which documents prove a transaction, what has to be on them, and when is a scan or replacement document still acceptable?
Short answer: a Buchungsbeleg is the document you use to prove a business transaction and link it to a booking entry.
In Switzerland this can be:
- supplier invoices
- receipts / till slips
- card and bank confirmations
- customer invoices
- credit notes
- and, in limited situations, an internal replacement document
The important part is not the file type, but that a knowledgeable third party can still understand what happened, when, for how much, and which entry the document supports.
If you want to understand the chronological side of bookkeeping (what happened when), read also: Buchungsjournal Switzerland.
This page solves the real-world questions
Most people don’t struggle with the definition. They struggle with edge cases: bank statements, missing receipts, scans, and how to keep things reviewable.
Which documents count
Invoice, receipt, statement, credit note, expense claim, or internal doc?What should be on the document
So the entry stays understandable laterWhen the payment proof is not enough
A bank statement shows the money flow, not always the business purposeWhen digital is enough
Scans, electronic storage, and the Swiss retention periodWhat is a Buchungsbeleg?
It’s the proof behind a bookkeeping entry. Without a document trail, bookkeeping becomes hard to verify, especially for VAT topics, year-end, or fiduciary review.
External document
For example a supplier invoice, receipt, card slip, or bank confirmation.
Internal document
For example a customer invoice, credit note, or a documented correction.
Stable reference
A document number or identifier that links document and entry.
Audit trail
Good bookkeeping lets you go from document to entry and back.
Which documents are usually supporting documents in Switzerland?
In practice, more documents count than people expect. A supportive set typically includes:
- supplier invoices and contracts (when relevant)
- receipts and till slips
- card confirmations and bank statements
- customer invoices and credit notes
- expense claims (especially when employees or contractors submit them)
Is a bank statement enough?
Sometimes it helps, but it’s often not sufficient on its own. A statement proves the cash flow; it doesn’t always prove what the transaction was for.
A common approach is:
- bank statement + supplier invoice (for supplier payments)
- bank statement + customer invoice (for customer receipts)
- bank statement + receipt / note (for card expenses)
Should I number my receipts?
It’s strongly recommended. A simple numbering system makes it dramatically easier to:
- answer fiduciary questions
- find the document behind an entry
- prove completeness
Can I throw away paper after scanning?
Electronic storage can be acceptable in Switzerland if you ensure readability and traceability over the full retention period. If your process is still messy, keeping originals longer is the safer choice.
What if I lost the original receipt?
A replacement document can be a last resort. It should be used sparingly, clearly labelled, and documented so it explains the transaction and why the original is missing.
Common mistakes with
supporting documents
Most document problems come from weak links between entries and receipts, or from storing files without structure.
A payment shows money moved; it may not explain the full business reason
Without references, every follow-up question becomes slow
Photos in email and downloads are not a reliable archive
They fade, and later you lose the evidence
Common questions about Buchungsbeleg in Switzerland
Does every invoice count as a Buchungsbeleg?
Often yes, but not only invoices count. Receipts, bank confirmations, customer invoices, credit notes, and other documents can also be supporting documents if they make the transaction provable and understandable.
How long do I have to keep supporting documents in Switzerland?
Typically 10 years. The key requirement is that documents remain readable and retrievable for the full retention period.
Is a bank statement a sufficient supporting document?
Not always. It proves the payment flow, but often you also need the invoice, receipt, or contract to explain the transaction.
Can I keep everything digitally?
In principle yes, if your process ensures integrity, readability, and traceability.
What is a replacement document?
An internal document created when the original is missing. It can help explain a transaction, but it’s weaker than the original evidence and should be used only when necessary.
Keep your documents linked instead of reconstructing them at year-end
Magic Heidi helps you capture expenses and keep receipts connected to transactions so your Swiss bookkeeping stays explainable.
Further reading:
Last updated: April 2026.