About BubbleTax: the team behind the IBKR tax report
Who is behind BubbleTax.
We turn the Interactive Brokers Flex Query export into an auditable tax report under German law: figures calculated, form lines assigned, every number traceable to the original booking.
The company
BubbleTax is a German GmbH based in Neutraubling near Regensburg, registered with the Regensburg local court. The managing directors are the two founders, Thomas Ortmeier and Dominik Schröter. The product has been on the market since 2025.
We are not tax advisers and do not replace tax advice. We deliver the data basis: calculated under § 20 EStG, the InvStG and the BMF circulars, shown down to the individual transaction, so that you or your tax firm can check every figure.
Three paths to BubbleTax
We started with private investors. Today three groups use the same calculation.
Private investors
You upload your export, preview your results and receive the report with the amounts per line of Anlage KAP, KAP-INV and SO. You only pay when you download.
Start the free previewTax firms
Firms manage their clients with IBKR accounts in a dedicated interface and receive the same report, traceable down to the FIFO level. Access is granted on request.
Offer for tax firmsBrokers
Introducing brokers recommend BubbleTax to their German clients so that the tax question does not become a reason to leave. MEXEM, WH SelfInvest, AGORA direct and ProRealTime already do; LYNX clients have their own page.
Partnership for brokers
The founders
Two founders, two responsibilities: one for the tax logic, one for the platform.
- Thomas Ortmeier
- Founder and managing director, tax logic and product
- Thomas is responsible for the entire tax logic. He makes sure that corporate actions, foreign currencies, funds and securities transactions are processed correctly and that the results remain traceable for users.
- Dominik Schröter
- Founder and managing director, platform and technology
- Dominik builds the technical platform: from the website and the user flow to the processing of large data volumes. He makes sure the application is fast, stable and easy to use.
How BubbleTax came about
Anyone who downloads their transaction data from Interactive Brokers quickly ends up with hundreds or thousands of bookings, from shares and options to currencies. Many of them are complex, and the broker's standard reports do not prepare them in a usable way for the German tax return.
We wanted a solution that structures this data automatically and prepares it for the tax return: no black box and no hours of spreadsheet work, but a traceable calculation with evidence for every figure.
It started as a small internal tool, then became a solution for friends. When it became clear how many investors face the same questions, the idea became BubbleTax GmbH.
What we hold ourselves to
Three things have to come together for a tax report to be worth anything.
- Precision
- Every transaction is assigned to the right category, the right tax year and the right form line, using the ECB reference rate of the respective day.
- Traceability
- The report shows every figure down to the broker's original booking. You can check what we calculate, and so can your tax firm.
- Naming our limits
- We say what we do not do: no tax advice, no filing with the tax office. Checking the results remains with you or your tax firm.
See what comes out of it.
A complete sample report is available for download without a form and without an account. Or you start right away with your own data.