Advisio – our experience ensures your success

Auditing | Tax Consulting | Insolvency Consulting | Consulting service for physicians

Individual consultation where quality comes first in all tax and business matters for the best results in the Gummersbach and Siegen area and beyond

Are you are looking for a tax consultant office with many years of experience and qualified, highly motivated employees? Do you want this firm to consult you in all business and tax-related matters, starting from traditional tax consultancy to expert consulting on business management with solutions catered to your specific industry?

The Advisio team puts their clients first. Always. Choose from our locations in Gummersbach and Siegen in the Siegerland region and enjoy comprehensive personal consulting services. You may of course also contact us from all other regions in Germany to represent you as your competent partner in all tax and business-related matters as well as for your auditing needs.

Three managing partners, and around 35 qualified staff members (including eight tax consultants) as well as highly skilled specialists of the ETL-Group look forward to successfully offering individual and personal support with solid economic consulting for your business. In addition, we can also fall back on the know-how of ETL-Global.

Our top priority at Advisio is to support you in obtaining the best possible tax relief and optimize the profitability of your company’s management.

A further focus of our expertise lies in specialist consultancy for restructuring (insolvency consultancy), specialist consultancy for health care professions as well as company audits as part of a comprehensive consultancy approach.

Our goal is to successfully implement our many years of experience with a well-coordinated team of employees in a trusting cooperation with our clients.

We will be glad to help. Please contact us and let us rise to the occasion. Our experienced team of well-trained specialists looks forward to being of service!

Advisio tax consultancy, auditing and more...

Standort Gummersbach
Tax Consultancy Gummersbach

Our focus is on tax consulting and management consulting for industrial companies, medium-sized businesses, retail trade or craft businesses as well as their shareholders. We are also happy to advise you on setting up a new business.

Within the scope of tax-optimized structuring consulting, we develop tax-efficient corporate structures for you.
The basis for this is the (digitalized) financial and payroll accounting.
Among other things, we offer the following consulting services tailored to your needs:

  • Conversion of companies
  • Company succession
  • inheritance tax structures
  • business management consulting (e.g. liquidity planning)
Standort Siegen
Tax Consultancy Siegen

Along with industrial enterprises, medium-sized companies, retail or crafts businesses, the main focus of the Siegen Advisio team is on tax consulting for healthcare providers.

In addition to the general tax consulting offered, consulting for healthcare professions in the Advisio tax office in Siegen focuses on:

  • specialised financial accounting for physicians and dentists
  • monthly or quarterly tax projections with reserve planning
  • Monitoring the medical practice’s performance
  • Addressing VAT and trade tax issues
  • special consulting for group practices (BAG)
  • Autumn meeting to determine the provisional tax burden and discuss the practice’s goals for the upcoming year.
  • Appointments outside doctors' office hours


Auditing Gummersbach
Auditing Gummersbach

The main focus of Advisio's auditing activities is preparing audits of annual and consolidated financial statements. With the scaled audit of financial statements using the risk-oriented audit approach, generally with overall support by an experienced and well-coordinated auditing team, Advisio offers way more than just an audit:

  • Personal support by the auditor in charge for you
  • "Sparring partner" for Management and Supervisory Board
  • Direct communication and decision-making steps
  • We actively point out room for improvement
  • Cooperative partnership between auditor and client


Our expertise


Is your company subject to statutory audits? A qualified auditor on the Advisio team is there to answer all your questions until the annual or consolidated financial statements are audited ...

More information on auditing

Conversion to IFRS

Since 2005, listed companies in the EU have been required to prepare their consolidated accounts in accordance with IFRS. We will support you comprehensively during the conversion to IFRS.

More information on IFRS conversion


Fiduciary Services

In accordance with Section 2 (3) No. 3 of the German Public Accountants Act (WPO), we assume the fiduciary management of assets, asset components and/or interests of our clients ...

More information on trustee activities

Financial Accounting and Payroll Accounting

Upgrading financial and payroll accounting in the digital age. No problem for us! Take advantage of our specialists’ expertise and outsource your accounting via digital data transfer.

More information on financial and payroll accounting


Tax Consulting

Optimizing your tax situation by best-practice tax consulting! Do you want more than just consultation on preparing your tax returns? Our comprehensive consulting approach also includes support in all of your business-related and personal tax matters.

More information on tax consulting


Annual Financial Statements

Management controlling based on annual financial statements and accounting? You can also request an individual explanatory report including the key figures relevant to you in addition to the standard annual financial statements.

More information on annual financial statements


Management Consultancy

Do you need support in corporate management, an analysis of revenue increases/cost saving potentials or individual revenue and liquidity planning? The Advisio team will be happy to set up a concept specifically tailored to your requirements.

More information on management consultancy



Restructuring and insolvency consulting

Do you need professional consulting when your company encounters difficulties? We assist partners and managing directors in operative, strategic and financial restructuring and in implementing these concepts.

More information on restructuring and insolvency consulting


Consulting for health care professions

Are you a physician, dentist, pharmacist or any other type of healthcare professional? Looking for a tax consultant who knows more than just how to prepare your annual financial statements and tax returns? Then Advisio is your ideal partner.

More information on consulting for healthcare professions


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