F-tax is one of the first things you deal with when you start a business in Sweden, and one of the things most often misunderstood. This guide covers what it is, who needs it, how to apply, and every tax declaration deadline that matters for 2026 — whether you run a sole proprietorship, a limited company, or something in between.

What is F-tax?

F-tax, or F-skatt in Swedish, stands for företagsskatt, which translates roughly as corporate tax. It is not a tax itself but a tax status. When your company holds F-tax approval, it means you as the business owner are responsible for paying your own preliminary tax and social security contributions. Your clients do not need to withhold anything on your behalf.

In practice, F-tax approval is what allows you to issue invoices in the normal way. Without it, your clients are legally required to deduct tax from what they pay you, which creates extra administration for everyone and signals to the market that your tax situation is unresolved.

F-tax, A-tax and FA-tax: What is the Difference?

Sweden uses three different tax designations depending on your employment and business situation. Understanding which one applies to you is important because getting it wrong means either your employer handles deductions incorrectly or your own preliminary tax payments are off.

If you run a seasonal business, you only pay F-tax during the months when you have income. You do not need to pay contributions during months when there is no business activity.

Do You Actually Need F-tax?

There is no legal requirement to hold F-tax. You can run a business in Sweden without it. However, the practical consequences of not having it affect both you and your clients.

Without F-tax approval:

• Your clients must deduct 30% tax from any payment they make to you
• Your clients must pay employer social security contributions on top of that
• Many larger companies and public sector clients will not work with suppliers who do not hold F-tax, as it creates administrative work they want to avoid
• You must write "Not approved for F-tax" on every invoice you send, which raises questions from clients

There is an alternative if you want the flexibility of invoicing with F-tax status without holding it yourself. Umbrella company arrangements, known in Sweden as egenanställning, allow you to work through a company that holds its own F-tax. They take on the employer responsibility, handle tax and contributions, and pay you a net salary. This flexibility costs a percentage of each invoice, typically somewhere between 3% and 10% depending on the provider.

How to Apply for F-tax

Applying for F-tax is straightforward. The fastest route is through the e-service at verksamt.se, where you can apply for F-tax, register for VAT, and register as an employer in a single form. If you prefer paper, you can download form SKV 4620 from Skatteverket and send it by post.

What Skatteverket checks before approving

Before approving F-tax, Skatteverket will verify that:

1. You plan to run a business for profit The activity must be independent, ongoing, and intended to generate profit. One-off or hobby activities do not qualify.

2. Your taxes and fees are paid up Outstanding tax debts are a common reason for applications being rejected or delayed. Settle anything outstanding before you apply.

3. Your income tax returns are submitted All previous declarations must be filed. Missing returns will hold up your application.

4. No business ban applies If your company has been subject to a business ban or has abused F-tax approval within the past two years, the application will be denied. The company also must not be in bankruptcy.

Processing typically takes three to six weeks. The more complete and straightforward your application, the faster it moves. If Skatteverket needs to request additional information, it will take longer.

When F-tax Can Be Withdrawn

F-tax approval is not permanent. Skatteverket can withdraw it if you breach the conditions of the approval. It is also withdrawn automatically in certain situations.

Common reasons for withdrawal

• You stop paying preliminary tax, or fall significantly behind on payments
• You stop filing income tax returns
• The business has never started, or has been inactive for a year or more
• You close the company and voluntarily request withdrawal

You can also voluntarily revoke your own F-tax approval, for example when closing down a company. If you close your business and do not plan to operate again, you should also deregister for VAT and F-tax at the same time to avoid ongoing filing obligations.

Tax Declaration Deadlines in Sweden: Every Date for 2026

Every company in Sweden must file an income tax return each year. Which return you file, and when, depends on your legal structure. Miss a deadline and Skatteverket will issue a late filing penalty, so the dates below are worth saving.

Main deadlines by company type

When does the declaration arrive?

If you are a sole proprietor with a digital mailbox, your tax return will arrive between 2 and 6 March. Without a digital mailbox it may arrive as late as 15 April. For limited companies and other legal entities, the timing depends on when your financial year ends.

Broken fiscal years: declaration dates that are different

If your company's financial year does not follow the calendar year, your declaration deadline is different. Here are the relevant dates:

If you cannot file on time because you are waiting on information, you can apply to Skatteverket for a deferral. This must be done before the original deadline.

Financial Statements: Which Type Does Your Company Need?

Before you can file your tax declaration, you need to have your financial statements in order. Which format applies to your company depends on your legal structure and your annual turnover.

Sole proprietorships

If your annual turnover is below SEK 3 million, you can prepare a simplified annual account (förenklat årsbokslut). This consists of a balance sheet and an income statement showing your financial position and results for the year. If your turnover exceeds SEK 3 million, you must prepare a full annual account with additional notes. You can also choose to prepare the fuller version voluntarily even if your turnover is below the threshold.

Limited companies

Limited companies are always required to prepare a full annual report (årsredovisning) regardless of size. Smaller limited companies can use the simplified K2 rules, which reduce the reporting requirements considerably. Larger companies or those that prefer more flexibility in accounting practices use K3 rules instead.

Partnerships

Trading and limited partnerships prepare annual accounts or an annual report depending on their size and whether any of their shareholders are legal entities. A partnership that has at least one company as a partner must always prepare a full annual report.

Partners in Limited Companies: The K10 Appendix

If you are a partner in a closely held limited company, which in Sweden is called a fåmansbolag, there is an additional step. As well as the company filing its own income tax return (INK2), you personally must file a K10 appendix together with your private income tax return each year.

The K10 determines how much of any dividend or capital gain from the company is taxed at the lower 20% rate and how much falls into ordinary income tax. Getting the K10 calculation right is one of the more technical aspects of running a closely held Swedish company, and mistakes here can result in higher personal tax than necessary or tax corrections from Skatteverket further down the line.

Frequently Asked Questions