Process IBKR client cases without losing a day.

BubbleTax turns your clients' Flex Query exports into an auditable tax report mapped to the lines of Anlage KAP, KAP-INV and SO. Client management included. Request access, start within one business day, no sales loop.

BubbleTax calculates, your firm assesses and takes responsibility. The tool replaces the manual work in Excel, not the advice.

Client management in BubbleTax: list of clients with client number and the actions open, rename and delete, above it the form for adding a client, fictitious test data

Three things that take work off your desk.

Not another practice management system. One tool for exactly the part that is manual work today.

Client management. Every client is kept separate, with their own accounts, tax years and history. You see at a glance which case is calculated and which one still needs data.

Auditable reports. Every figure is broken down to the individual transaction, with acquisition date, price, currency conversion and legal basis. You spot-check instead of recalculating.

Traceability as a working paper. FIFO runs consistently across all years, every conversion states rate and date. When the tax office asks, the derivation is in the report and not in a spreadsheet nobody can open any more.

From access to the first report.

You do not need a call with us to get started. If you want one, you get one.

  1. Request access. Firm, contact person, email, done. You receive access within one business day. Name additional colleagues and we enable them for your firm.

  2. Create clients and upload data. One Flex Query export per client, several tax years in one run. Pass the export guide to your client as a link.

  3. Review the report and use it. Transfer the figures to Anlage KAP, hand the full report to your client or file it as a working paper.

Prices you know before the conversation.

Billing is per billing unit in two tiers. No base fee for the firm account, no minimum volume, no contract term.

Firm prices per billing unit, net
TierPrice per billing unit (net)Included
Pro€83Stocks, ETFs and options, up to 2,000 transactions and up to 2 IBKR accounts per client and tax year, auditable report down to FIFO level, email support.
Ultimate€167All instrument classes including CFDs and futures, unlimited transactions and accounts per client and tax year, auditable report down to FIFO level, email support.

A billing unit is one client account set per tax year; a later upgrade to Ultimate is charged only at the difference.

You receive a monthly invoice for the previous month's usage, as a PDF with ZUGFeRD data for your bookkeeping.

The firm price is the net retail price per billing unit: no base fee, no minimum volume. The invoice goes to your firm, and we do not appear towards your clients. The value for your firm is the manual work saved per engagement, measured in hours, not a margin on the tool.

What you charge your clients for your work is your decision.

For professionals bound by secrecy.

What firms settle before the first client export is uploaded. Five points, each with the place where you can read it up.

Data processing agreement.
For firms that upload client data, we conclude a data processing agreement under Art. 28 GDPR on request, together with the access and before the first upload. Write to info@bubbletax.de for this.
Processing and storage location.
The calculation runs on servers of Hetzner Online GmbH in Germany. The database holding account, files and results is operated by the processor Neon under a contract pursuant to Art. 28 GDPR. The full list of service providers, with what each of them sees, is on the page Privacy, explained.
Confidentiality.
Under clause 7.1 of our terms and conditions, we treat all matters arising from the engagement as strictly confidential and impose the duty of secrecy on all employees and third parties with access to the data, without time limit beyond the term of the contract.
Liability and roles.
The tax assessment and the filing towards the tax office remain with your firm. BubbleTax calculates and documents, it does not advise (clause 2.1 of the terms). Every figure in the report can be verified down to the transaction. If you report an error, we correct the calculation and provide the report again. Liability is governed by clause 5 of our terms and conditions.
Deletion.
The last successful report per tax year is kept as long as the account exists. Older calculation runs are deleted automatically after 30 days. Files and inputs are deleted by you in the application, individually or in full. The detailed retention periods are on the page Privacy, explained.

A firm that already works with it.

„Unter den Lösungen, die wir für komplexe IBKR- und LYNX-Fälle bislang gesehen haben, ist BubbleTax aus meiner Sicht die stärkste.“
Leonie Krause, Taxperten Deutschland, Blog article of 3 July 2026 (in German)

Questions from tax firms.

Do you approach our clients or sell them anything?

No. We do not contact your clients, we do not advertise our own plans to them, and we do not appear in your engagement. The invoice goes to your firm. What you charge your clients is your decision.

How do I spot-check a report without recalculating it myself?

Every figure in the report is broken down to the individual transaction: acquisition date, price, conversion rate with its date and the legal basis. Pick a position, follow the FIFO chain back to the purchases and compare the entries with the client's Flex Query export.

What does it cost per client, and is there a minimum volume?

Billing is per billing unit, that is per client account set and tax year, in the tiers Pro and Ultimate. There is no base fee for the firm account, no minimum volume and no contract term. The invoice arrives monthly as a PDF with ZUGFeRD data.

Can several colleagues in the firm work on the same clients?

Yes. Your firm is set up as an organisation, and all enabled members see the same clients, orders and reports. Name additional colleagues with their email address and we enable them for your firm.

Who is liable if a calculation is wrong?

The tax assessment and the filing towards the tax office remain with you. BubbleTax calculates and documents, it does not advise. The report is built so that you can verify every figure down to the transaction. If you find an error, report it to us: we correct the calculation and provide the report again. Otherwise our terms and conditions apply.

All questions and answers

Request firm access

Tell us your firm, a contact person and an email address. You receive access within one business day.

Request firm access

We use your details only to set up the access and to contact you about it.