Our 3-minute recap of income tax in a video
We also have a webinar about income tax, which you can watch in the income tax webinar recording.
How does income tax work for Self-Employed?
As a Belgian citizen, you are expected to declare and pay taxes on your annual income. The declaration is included in the same tax return that you would fill in as an employee. There is only one income tax return for all your sources of income (self-employed, employee, and other private income such as real estate or stocks) and deductions (business expenses as self-employed, health insurance, donations, etc).
Please note that this article provides general guidance only. Tax rules may vary depending on your individual situation. When in doubt, ask your Tax Coach.
You declare and pay taxes on the previous fiscal year. For example, your 2025 income has to be declared in October 2026, and paid between October 2026 and April 2027.
You can do everything online yourself, via the official website Tax-on-web, until the 16th of October 2026.
There are 2 parts on your tax return:
Part 1 includes all your personal revenues (as an employee, or income from real-estate activities) and deductible expenses (e.g. donations). The part as an employee is pre-filled in.
Part 2 is related to your self-employed activity
Why Accountable is the best solution to submit your income tax
⭐ You will minimize your taxes We make sure all your professional expenses count to the maximum of their deductibility.
🎓 Your tax submission will be quick and correct Your income tax return will be submitted on time, with all the necessary documents.
💰 You save money You don't have to pay an expensive accountant to prepare your return; Accountable takes care of it for you.
✏️ Guaranteed 100% accuracy If you are ever fined or audited as a result of an Accountable error, we have got you covered.
🌎 You are in control You know exactly what you are submitting to the tax office. If anything is unclear, our team is here to help.
A complete how-to guide to fill in and submit
Step 1: Prepare your data for Part 2 in Accountable
Accountable will compute all the necessary information for Part 2 of your income tax return. Here is a quick checklist of what to prepare:
Go to your taxes screen > year 2025 > income tax submission 2025
Fill in the form and check that the information is correct (income statement, deductible expenses, advance payments, etc).
1) Tax review: The system runs a number of tests and can identify potential issues:
If the system detects one or more issues, these will appear in Yellow / Orange:
Click on the potential issue (for example, "You have unreviewed expense") to access the expenses concerned. If you are not sure what to do, contact us and we will help.
Once the issue has been corrected, the message will disappear.
2) Personal details: your personal information, civil status, and dependent children
3) Your activity: your profession, and self-employed activity start date
4) Professional capital gains: summary of your capital gains (only applies if you have sold assets in 2025)
5) Subsidies & indemnities: additional revenues you have recorded as subsidies
6) Income: your P&L as a self-employed, and revenue as an employee (relevant for complementary self-employed, or if you had an employee job in 2025 before starting as a self-employed)
7) Stock variations: This is where you enter the € value of your stock variations, if necessary.
8) Advance payments: Here you need to input the quarterly prepayments you have made (pre-filled based on what you have recorded in Accountable).
9) Review will show you all the cells you need to fill in online in Part 2 of your tax return, with the related values.
10) Submit: This step guides you through the steps on MyMinFin, with screenshots available for each step.
💡 Tip:To move from one step to the next, scroll to the bottom of the page and click "Next" to validate the step you have just followed.
Step 2: Submit your tax return online
1) Log in to MyMinFin to file the return: log in under your own name, not your company's name.
2) Go to "my tax return": Click on "Access My Statement" and "to fill in".
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3) Part 1: Your pre-filled data: Check if all your details have been filled in correctly.
If everything is correct, click on "my data is correct and complete" to move on to the next section.
If your details are not correct, you still have the option to edit them.
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4) Click on "Part 2": Fill in your profession and business number and go to the next frame.
5) Fill in your data as shown in Accountable.
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6) When you have filled in all your data: click on the last frame and click on "go to the next frame".
7) View your new calculation simulation and click on "Send".
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8) Confirmation of submission: you have submitted your return and will receive a confirmation. You can print the declaration.
9) Your submission is now being processed.
10) You can find your return under "my documents".
Your return is now submitted.
How to pay your income tax?
You don't pay at the same time as the submission of your income tax declaration. Payment comes later in the year, when you receive the final calculation from the government. Receiving this document can vary from Autumn of the same year to Spring of the next year. Payment of the income tax is also done via MyMinfin.
The easiest option is to pay online via MyMinfin. You will pay automatically to the correct bank account number, with the specific reference.
Other means of payment
You can also pay
by bank transfer (with the correct specific reference) to the bank account number indicated on the tax assessment notice (also called "tax calculation" or "calculation note"), the payment advice, or the reminder;
with a bank card in one of the infocenters of the FPS Finance (Bancontact - Mister Cash);
to the debt collector when they have initiated proceedings (warning: there are additional costs in this case).
Warning: You can no longer pay in cash or with a (foreign) cheque. If you don't live in Belgium and don't have access to MyMinfin, you are advised to pay by free SEPA bank transfer.
Always use the specific reference you will find on your tax assessment notice, the payment advice, or the reminder. The government can then process your payment automatically and quickly update your situation.
Looking for more guidance?
Join our upcoming webinars designed for starters.
Start as Self-employed: Learn about the different statuses, tax obligations, and how to start as a self-employed professional.
Tips and tricks in Accountable: Understand deductible expenses, how to record revenue and expenses, automate your accounting, and more.
Key takeaways
You declare and pay income tax on the previous fiscal year, via Tax-on-web, with a deadline around mid-October.
Your tax return has two parts: Part 1 covers all personal income (partly pre-filled), and Part 2 covers your self-employed activity.
Accountable prepares all the data you need for Part 2 and guides you through the submission on MyMinFin step by step.
Income tax is paid separately from the submission, once you receive the final calculation from the government, via MyMinfin or bank transfer using your specific reference.
Need help? Chat with us or email support@accountable.eu, we're happy to help.