Milchbüechli Bookkeeping in Switzerland: What Counts, What Doesn't — and How to Automate It

What Is Milchbüechli Bookkeeping?

Milchbüechli bookkeeping — called «vereinfachte Buchführung» (simplified bookkeeping) in Swiss law — is the simplest form of accounting the Swiss legal system allows. It consists of a straightforward record of all income and expenses, without a chart of accounts, without a balance sheet, without debit and credit.

The name comes from the 19th century, when dairy farmers noted their deliveries in a small notebook (Büchlein). What worked with pencil back then can now be handled digitally — and automated. For a broader overview of all bookkeeping obligations as a freelancer, see our complete freelancer guide.

Legal Basis: Who Can Use the Milchbüechli?

The legal foundation is Art. 957 para. 2 of the Swiss Code of Obligations (OR). It allows simplified bookkeeping for:

• Sole proprietorships with annual revenue below CHF 500,000
• General and limited partnerships below the same threshold

Important: GmbH (LLC) and AG (corporations) are always required to use full double-entry bookkeeping — regardless of revenue.

What Happens When You Exceed the Threshold?

Once your annual revenue exceeds CHF 500,000, you are legally required to switch to double-entry bookkeeping. LumaBill makes this transition easy: a single toggle in settings activates the advanced mode — all existing data is preserved.

Voluntarily Switching to Double-Entry

You can switch to double-entry bookkeeping at any time, even below the threshold. This makes sense if you:

• Want to apply for a bank loan
• Are seeking investors
• Are building a more complex business structure

What Goes Into the Milchbüechli — and What Doesn't?

What You Must Record

What You Do Not Need

• Chart of accounts (no standard account numbers)
• Balance sheet (no assets/liabilities breakdown)
• Formal profit & loss statement
• Debit/credit journal entries
• General ledger in the accounting sense

Grey Areas: What Many Get Wrong

Mixed-use expenses: Home office, phone, car — record only the business portion. With 40% home office use of a room: 40% of rent as expense. Keep a brief note explaining how you calculated the proportion.

Small cash expenses: Even CHF 3.50 for parking requires a receipt. A phone photo is sufficient — the digital copy is legally equivalent.

Private contributions and withdrawals: These are not income or expenses in the bookkeeping sense, but must be noted separately.

Practical Example: One Month as a Freelancer

Imagine you're a web designer with a sole proprietorship. March 2026 looks like this:

March 2026 totals:

• Income: CHF 5,950
• Expenses: CHF 342
• Surplus: CHF 5,608

You sum this surplus across all months of the year. At year end, you get your net profit, which you declare as income on your tax return — directly, without conversions or adjustments.

Retention Requirement: 10 Years, Digital Allowed

All receipts and records must be kept for 10 years (GeBueV Art. 9). This applies to:

• Sales invoices (your invoices to clients)
• Purchase invoices (vendors, subscriptions)
• Bank statements and receipts
• The income/expense list itself

Digital receipts are fully valid — you don't need to keep paper originals. Requirement: the digital copy must be stored in an unalterable format and always readable. A standard PDF on a cloud drive is sufficient.

Recommended Filing Structure

2026/
  01_Income/
    2026-03-03_ClientA_Website.pdf
  02_Expenses/
    2026-03-07_AdobeCC.pdf
  03_BankStatements/
    2026-03_UBS_Statement.pdf

Even simpler: use bookkeeping software that stores receipts directly and links them to each transaction automatically.

The Most Common Milchbüechli Mistakes

1. Missing receipts for cash expenses No receipt = no recognized expense in an audit. Photograph receipts immediately with your phone.

2. Mixing private and business The most common problem with sole proprietorships. Maintain a separate business account if possible. At minimum: add a note to every mixed expense showing the business portion.

3. Not recording entries promptly Entering three months of receipts at once leads to errors and forgotten entries. A weekly 15-minute routine is more realistic than daily individual entries.

4. Income recorded at the wrong time Milchbüechli uses the cash basis: income is recorded when money arrives — not when the invoice is issued. Open invoices do not appear in your income.

5. Missing deductible expenses Many freelancers forget: professional books, further training, home office portion, bank fees, tax advisory costs, business portion of private vehicle use. All deductible — all go in the Milchbüechli.

Automate Your Milchbüechli with LumaBill

LumaBill's simple mode is a digital Milchbüechli — legally compliant, automatically linked to your invoices, and archived to GeBueV standards.

What Happens Automatically

Invoices: Every paid invoice automatically creates an income entry. No double work.

Expenses and receipts: Upload a photo of your receipt — AI detects the amount, date, and vendor and suggests the right category. With Pro + AI (CHF 24/mo) up to 100 receipts per month.

Bank import (CAMT.053): Upload your bank statement in CAMT format. LumaBill automatically matches transactions to invoices and expenses. Included in the Pro plan (CHF 15/mo) — no surcharge.

GeBueV export: With one click, export all records in a format your accountant or tax authority can use directly.

Upgrade at any time: When your business grows beyond CHF 500,000, activate double-entry with a toggle. All existing data is preserved — the general ledger, chart of accounts, and balance sheets are calculated retroactively.

LumaBill Pricing

For comparison: Bexio Basic costs CHF 35/mo — without bank import and without AI. Detailed comparison →

Start for Free

Try LumaBill free with 5 invoices — no subscription, no credit card needed. Create your first Swiss QR invoice in minutes.

Conclusion: The Milchbüechli — Simple, but Not Informal

Milchbüechli bookkeeping is the right choice for the vast majority of Swiss freelancers and sole proprietorships:

• Legally sufficient below CHF 500,000 annual revenue (OR Art. 957 para. 2)
• Significantly less effort than double-entry bookkeeping
• Tax-ready — the annual surplus goes directly into your tax return
• Fully digital — receipts as PDFs, records in an app

The most common mistake: too little discipline around receipts and recording entries too late. With the right software, the Milchbüechli takes under 30 minutes per month.

Start free with 5 invoices — no credit card, no commitment.