How is a private trader’s tax return filed in the UKKO Entrepreneur service?

The UKKO Entrepreneur service prepares and files your business tax return (Form 5), also known as a private trader’s tax return, on your behalf. The return is based on the information you have added to your bookkeeping and the additional information you provide in the tax return questionnaire.

Please also check your personal pre-completed tax return in MyTax.
 

How to make sure your tax return can be filed

1. Add your income and expenses to your bookkeeping. Make sure all information and receipts for the previous year are included.
2. Check that your Suomi.fi authorization is valid and all service fees have been paid. Also make sure your UKKO Entrepreneur account remains active until your tax return has been completed.
3. Complete the tax return questionnaire. The questionnaire becomes available in the service in January. You can find it on the home page after logging in. Complete the questionnaire for your 2026 tax return by 31 January 2027.
4. Respond to any requests for additional information. We will contact you if we need more information for your tax return.

We will email you once your tax return has been submitted to the Finnish Tax Administration. Preparing your tax return is included in the UKKO Entrepreneur service when your customer account is active at the time the return is submitted.

 

What information should I provide in the tax return questionnaire?

The questionnaire asks for information needed for your private trader’s tax return. Go through the questions shown to you and provide information such as:

• business-related driving
• temporary work trips and daily allowances for work trips abroad
• home office deduction, if you work from home for your business
• the value of inventory related to your business.

Keep your driving log, records of your trips and other receipts related to deductions. The Tax Administration may ask for them later.

Read more: What is the tax return questionnaire and how do I complete it?
 

Do I need to complete the questionnaire if I have no deductions?

Yes. Complete the tax return questionnaire even if you are not claiming any deductions, and select that you have nothing to deduct by entering zero in the questionnaire.
 

What is the difference between a private trader’s tax return and a personal tax return?

The business tax return contains information about your private trader business. The UKKO Entrepreneur service prepares and files this return on your behalf based on the information you provide.

Your personal pre-completed tax return contains information related to your personal taxation. Check it yourself in MyTax and add or correct information if necessary, following the Tax Administration’s instructions.

The Tax Administration automatically combines the information from your private trader’s business tax return with your personal taxation and tax return.

From the 2026 tax year onwards, trade union membership fees are not tax-deductible. Unemployment fund membership fees remain deductible.
 

What should I do if I need help?

Contact our customer service team at asiakaspalvelu@ukkopro.fi if, for example:

• the tax return questionnaire does not appear in the service
• you cannot complete the questionnaire by the deadline
• you notice that information you submitted needs correcting
• you need help with your Suomi.fi authorization or service fees.

In your message, tell us which tax year and issue your question concerns.