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Welcome to Altesia Tax & Accounting !

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We provide full Tax and Accounting services for SMEs and Management Companies.


We pride ourselves on delivering top-notch accounting services that are optimized for cost and efficiency through the use of cutting-edge digital tools. But we also understand that personal relationships are just as important as digital efficiency. That's why we strive to maintain a human touch in all of our interactions with clients.

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For management companies and freelancers please visit our dedicated website.


of choosing Altesia Tax & Accounting

Innovative Digital Tools

We leverage the latest digital tools to optimize our processes and help you save time and money. Our goal is to streamline your accounting operations and simplify your financial management.

We are paperless

  • Efficient document sharing thanks to collaborative digital tools

  • OCR and IA tools supporting data entry

  • Reporting tools to follow up easily your key figures

Accouting software


We use most of different modern accounting software (Odoo, Horus, Exact…) and can quickly master any other if needed.

Customized solutions

We understand that every client is unique, which is why we tailor our services to fit your specific needs. Whether you're a small or a medium business, we can help and we offer financial support throughout the evolution of your company.

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As soon as your company grows and the complexity of financial monitoring increases, Altesia offers flexible part-time solutions for book-keeping, financial control and CFO.

Two forces, one goal

The finesse of Altesia Tax and Accounting services intertwines with the prowess of Altesia’s innovative CFO Services to create an unbeatable duo that forge a path to financial prosperity, revolutionizing the way of doing finance. Whatever the stage of your company, we have the expertise and professionals to tailor the most suitable and impactful solutions, ensuring your financial success.

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Personalized attention

While we pride ourselves on our digital efficiency, we never forget the importance of human interaction. We take the time to understand your needs and goals, and we work closely with you to develop a plan that meets your needs.

Digitalization helps us keep time for qualitative human interaction

  • 2 Offices – La Hulpe and Namur

  • Meetings face-to-face or via Teams

  • 1 Single Person of Contact and 1 supervisor to keep the helicopter view

  • Prompt reply to all your requests

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Competitive pricing

We offer competitive pricing for our services, without sacrificing quality or personal attention. As we streamlined routine tasks, we are able to allocate more time on added-value activities without increasing the price compared to other Fiduciaries.

We believe that our approach to accounting is unique and disruptive in the industry, and we are committed to providing our clients with the best possible service.


Book an appointment with us to learn more about how we can help you with your accounting needs!


On the Phone


Our team of expert accountants is dedicated to providing customized solutions that fit your specific needs. From book keeping to tax preparation, we offer a range of services designed to help you achieve your goals.

Full charted accounting

We provide A to Z services from bookkeeping to year-end closing and official publications.

  1. Bookkeeping

  2. Analytical accounting

  3. Supervision of internal accountants

  4. Interim situation & reporting

  5. Annual closing

  6. Corporate tax return


We perform Tax diagnostics to analyse your situation and propose specific tax optimisation advices.

  1. Proactive advices based on the constant changes in tax legislation

  2. Defense against tax authorities

  3. Compliance with your tax obligations for all types of declarations and tax forms

Specialized  Services

We can help you for...


  1. Support in company creation and financial plan preparation

  2. Admin procedures for withholding tax reduction (R&D)  AND social security reduction

  3. Support in subsidies search

  4. Stock options as incentive for employees

  5. Etc


Equipe Altesia

Hadrienne Flahaux

Hands on Tax & Accouting Partner

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