The sole proprietorship is not a separate legal entity. This means: For tax purposes, the company merges with the owner's private person. There is no separate company taxation for the company itself. Instead, the owner declares the business profit of his sole proprietorship together with all his other income (e.g. from sideline business, interest, rent, etc.) in the private tax return. The business assets of the sole proprietorship are also added to the owner's private assets and taxed by the owner.
What does this mean in concrete terms for taxes as an expense? In a sole proprietorship, there is no separate tax expense in the income statement. *The owner's income and wealth taxes are paid privately after the profit has been determined. Therefore, individual company owners cannot deduct the taxes paid from taxable profits - neither for direct federal tax nor for cantonal taxes. This point cannot be emphasized enough, as it is one of the main distinguishing features compared to corporations. In practical terms, it means No “tax expense” account appears in your sole proprietorship accounting, which reduces the annual profit. The profit before tax is also the profit that is taxed. As a private individual, you pay the tax liability from this profit (or from the funds that you withdraw from the business).
Example sole proprietorship: Markus is a self-employed web developer and made a business profit of CHF 80,000 in 2024. He shows exactly this profit in his accounts. Markus now has to pay income tax on this. Let's assume that, based on his total income and canton of residence, the tax owed is ~CHF 15,000. Markus cannot book this CHF 15,000 anywhere in the income statement as an expense to reduce the profit. He has to pay the tax privately (usually he already receives prepayment invoices from the canton, which he pays from his business or private account - in accounting terms this would then be a private withdrawal, not a business expense). The profit of CHF 80,000 remains in his income statement, and he declares exactly this amount as income in his tax return. Important: However, Markus was allowed to deduct all business-related expenses before this profit calculation - e.g. office costs, software licenses, further training courses, business car depreciation, etc. These reduce the profit and thus indirectly reduce the income. These reduce the profit and therefore indirectly also the tax. What he was not allowed to deduct were private expenses. If, for example, he had declared a portion of his private rent as business premises that was not justified, this would be offset again. His health insurance premium was also not included in the accounts (but is taken into account separately as an insurance deduction in the tax return). Losses: If Markus suffers a loss, he can offset it against other income on his tax return or carry it forward to future years - but that's a separate issue. Key point here: Taxes are paid by Markus from the profit, and this remains in full in the business accounts.
The situation is different if you incorporate your activity in a GmbH (limited liability company) or AG (public limited company). These companies are legal entities - they are legally treated as independent tax subjects. The company itself pays taxes on its profits (and, where applicable, capital taxes on its equity). And this is where there is a significant difference: the taxes on profits paid by the GmbH/AG appear as an expense in the income statement of this company. This is referred to as tax expense in the annual financial statements, which reduces the net profit. In contrast to sole proprietorships, corporations can therefore deduct tax expenses from their profits - at least in their income statement and for the presentation of the annual result. However, it should be noted that the tax is of course calculated on the profit before tax. It is therefore not possible to reduce the tax burden simply by increasing the tax expense - it is rather an accounting item that subsequently reduces the profit as soon as the tax has been calculated. Nevertheless, from a purely formal and tax law perspective, the following applies: In the case of a corporation, the paid profit tax is a recognized expense item.
Important: If the company itself pays tax, this does not mean that you as the owner no longer pay tax. The principle of double taxation and special relief rules apply here. Specifically: First, the GmbH/AG pays tax on its profit with the profit tax (cantonal and federal tax). If it then distributes a share of the profit as a dividend to you as a private individual, you must pay tax on this dividend again as income (albeit at a reduced rate at cantonal level and for direct federal tax, e.g. only 50% of the dividend to mitigate double taxation - known as partial taxation). As a private individual, you also pay tax on any wages that you receive from your company as normal income.
Tax expenses in the GmbH/AG accounting: At the end of the year, the GmbH or AG usually creates a tax provision in the accounting for the expected tax on the profit. This provision is an expense and reduces the reported annual profit. In the following year, when the final tax invoice arrives and is paid, it is booked against the provision. From the company's point of view, these taxes are simply an item such as rental expenses - a charge against the business result. From the owner's point of view, however, it is not so directly noticeable: you only see that the annual financial statements show, for example, a pre-tax profit of CHF 50,000, of which CHF 7,500 is profit tax, leaving a net annual profit after tax of CHF 42,500. This after-tax profit can then either be retained by the company or distributed as a dividend.
Example GmbH vs. sole proprietorship: Let's take Anna, who works as a consultant. Variant A: Anna is a sole proprietor and makes a profit of CHF 100,000 in 2024. She must pay tax on this amount as income (progressive, depending on residence, perhaps around CHF 20,000 tax). The profit remains CHF 100,000 in the income statement of her sole proprietorship; she pays the tax privately. Option B: Anna founds a limited liability company** “Anna Consulting GmbH”. The GmbH also generates a pre-tax profit of CHF 100,000. At the end of the year, the limited liability company books perhaps ~CHF 15,000 as tax expense (depending on the tax rate of her canton for legal entities). CHF 85,000 profit after tax remains in the GmbH. Anna can withdraw part of this as a dividend. Let's assume that she pays herself a dividend of CHF 50,000. Anna must now pay private tax on this CHF 50,000, but only 50% of it is taxable (partial taxation), which may amount to ~CHF 5,000 in taxes. In addition, she may have received a salary from the GmbH that has already been taxed. In total, she therefore also pays taxes indirectly, but split between company and private. The difference lies in the accounting: The CHF 15,000 tax expense of the GmbH is an expense item in its books (allowed as a business expense because it is a corporation) - something that Anna was not allowed to do as a sole proprietorship.