Avoidable VAT mistakes cost Swiss SMEs money, for example through additional tax assessments and default interest. Not because business owners are careless, but because the Swiss value added tax system, with its different tax rates, reporting periods and deduction entitlements, challenges even experienced bookkeepers. This article shows the most common pitfalls and how to avoid them reliably.
Switzerland has three tax rates: the standard rate (8.1 %), the reduced rate (2.6 %) and the special rate for accommodation (3.8 %). In addition, there are supplies exempt from tax with credit (Art. 23 of the VAT Act (MWSTG)), such as exports: they are not taxed, and input tax remains deductible. These must be distinguished from supplies excluded from tax (Art. 21 MWSTG), such as many supplies in the healthcare, education and insurance sectors: no VAT is charged on them, but as a rule there is no input tax deduction either. The mistake often happens with bundled supplies or when exempt or excluded turnover is accidentally reported at the standard rate.
A restaurant charges the standard rate of 8.1 % for food and drinks it serves on the premises. The reduced rate of 2.6 % applies only to food and non-alcoholic drinks for takeaway or delivery, provided the separation is ensured organisationally (Art. 25 para. 3 MWSTG). Anyone who applies the rates incorrectly risks additional assessments including default interest.
Practical tip: Keep a clear mapping of tax rates for each product category in your accounting system.
Not all input tax may be deducted in full. Expenses for private use, for activities excluded from tax or for certain entertainment costs are wholly or partly excluded from the input tax deduction. A common example: the company car that is also used privately. The input tax deduction must be corrected according to the share of business use.
It becomes particularly critical with mixed use, that is when an SME provides both taxable supplies and supplies excluded from tax. Careful allocation of input tax is required here: the correction must reflect the proportion of use (Art. 30 MWSTG); permitted methods are actual allocation, flat-rate methods of the Federal Tax Administration (ESTV) or the company’s own calculations (Art. 65 of the VAT Ordinance (MWSTV)).
Anyone who generates more than 100’000 francs in annual turnover in Switzerland is, as a rule, liable for VAT and must register with the ESTV. Many start-ups underestimate their growth and register too late. The consequence: the ESTV can claim the VAT retroactively, namely out of the revenue already generated, without the business owner being able to recover it afterwards.
Important: The 100’000-franc threshold applies to worldwide turnover, not just the Swiss share. And voluntary registration below the threshold can be worthwhile if you want to claim a lot of input tax.
Businesses liable for VAT can report on the basis of agreed consideration (invoice method) or on the basis of consideration received (cash method). The choice of method has a considerable impact on liquidity requirements. Anyone reporting on the basis of agreed consideration owes the VAT once the invoice is issued, regardless of whether the customer has already paid. With long payment terms, this can lead to a considerable financing problem.
The mistake often happens when changing methods or when invoices are cancelled and reissued. Complete documentation is essential here.
Since 1 January 2025, a new ESTV practice has applied to the net tax rate method. Previously, a maximum of two net tax rates per business was possible. Now a company can apply its own net tax rate for each activity that accounts for more than 10 percent of total taxable turnover. The former 50 percent rule for mixed sectors no longer applies. Anyone carrying out several activities should review their rates, as an incorrect allocation leads directly to an incorrect tax return. The eligibility threshold for the method remains at annual turnover of up to CHF 5’024’000 and a maximum tax liability of CHF 108’000.
When you correct an invoice or grant a discount, the correcting entry must adjust both the net price and the VAT correctly. A frequent source of error: credit notes are recorded without a VAT entry, or the tax rate of the credit note does not match that of the original invoice. Such differences can be noticed during a VAT audit.
Own use is an often overlooked VAT event. If you take goods or services from your business for private purposes or compensate employees with benefits in kind, VAT liability arises on these supplies. For supplies to closely related persons, the consideration is the value that would be agreed between independent third parties (Art. 24 para. 2 MWSTG).
Particularly in payroll accounting, where employees receive company cars, meals or other benefits in kind, correct recording is crucial. These items can be examined during an ESTV VAT audit.
A VAT invoice must contain the mandatory details required by law: name and location of the supplier and the recipient, VAT number, date, description of the supply, consideration and the tax rate applied. If details are missing, proving the input tax deduction becomes more difficult. Formal defects alone must not prevent the deduction, however; the principle of free assessment of evidence applies (Art. 81 para. 3 MWSTG). You should therefore also check the invoices you receive yourself.
An underestimated area: when Swiss SMEs obtain services from foreign providers, they may themselves owe the VAT through the so-called reverse charge tax (Bezugsteuer). This applies, for example, to software subscriptions, consulting services or advertising services from the EU. The foreign provider does not charge Swiss VAT, but the Swiss recipient must declare and pay the tax itself. If your company is liable for VAT, you owe the reverse charge tax on such services from the first franc (Art. 45 para. 2 let. a MWSTG). The threshold of CHF 10’000 per calendar year applies only to recipients who are not liable for tax (Art. 45 para. 2 let. b MWSTG).
For the import of goods, on the other hand, the Federal Office for Customs and Border Security (BAZG) levies VAT directly on import. This import tax may be deducted as input tax, provided valid proof in the form of import documents is available. If it is missing, the input tax deduction is lost. A common mistake: import invoices are filed without the associated customs documents and cannot be substantiated during an audit.
Practical tip: Keep a separate account for reverse charge tax entries and systematically archive import documents together with the corresponding incoming invoices.
Bilanzo is not another accounting program, but a local AI bookkeeping agent that works within your existing software (for example bexio). When recording, it recognises the correct VAT rate, distinguishes tax-exempt supplies and the reverse charge tax on services from abroad, and warns of unusual tax configurations before an incorrect entry is made. This way your VAT return is cleanly prepared from the outset, while it continues to be created in your usual software.
For accounting and fiduciary firms (Treuhänder), this means: the system takes over the repetitive bookkeeping work. Control, professional review and correction remain entirely in the hands of the fiduciary, with more time and focus for them. With every return, the system gets to know the client’s particularities better, so that the quality of the suggestions improves with every iteration. Test Bilanzo free of charge with 100 documents and see for yourself.
Related articles: Year-end closing checklist 2026 and Payroll accounting 2026.
Three rates apply: standard rate 8.1 percent, reduced rate 2.6 percent (e.g. food, books) and special rate for accommodation 3.8 percent. These rates have been in force since 1 January 2024 and remain unchanged in 2026.
From worldwide annual turnover of CHF 100’000 from taxable supplies, there is, as a rule, VAT liability and registration with the ESTV is required.
Since 1 January 2025, more than two net tax rates per business are possible. For each activity accounting for over 10 percent of total turnover, a separate rate can be requested; the old 50 percent rule for mixed sectors no longer applies.
If your company is liable for VAT, you owe the reverse charge tax on services from foreign providers (e.g. software subscriptions, consulting, advertising) from the first franc. The threshold of CHF 10’000 per calendar year applies only to recipients who are not liable for tax (Art. 45 para. 2 MWSTG).
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