BubbleTax at INVEST Stuttgart 2026
Trading meets tax logic: Where systems collide
On Friday, April 17, 2026, we'll be at INVEST Stuttgart — Germany's largest financial trade fair for private investors. Together with WH SelfInvest and stock3, we'll address a topic relevant to everyone trading through international brokers:
Why the numbers on your broker platform aren't the same numbers that belong on your tax return — and where things break down with ETFs, options, futures, and foreign currencies.
📍 ICS, Room C6.2 — WH SelfInvest | 4:00–4:45 PM
▶ View program on messe-stuttgart.de
What's it about?
Anyone trading through Interactive Brokers or an introducing broker like WH SelfInvest receives no automatic tax withholding and no annual tax certificate. The tax preparation is entirely the investor's responsibility.
In this talk, Thomas Ortmeier and Dominik Schröter will show where the systems diverge:
- Broker data ≠ tax data: Timing, classification, and EUR valuation — three dimensions where trading logic and tax law think differently.
- ETF classification: IBKR only knows "Stock/ETF". German tax law distinguishes InvStG funds (with partial exemptions), ETNs under § 20 EStG, and gold ETCs under § 23 EStG. The correct classification can mean hundreds of euros in difference.
- Options & short selling: A premium in December, an exercise in January — two separate taxable events in different years. With short sales, the FIFO logic is completely reversed.
- Futures: Your account fluctuates daily, but only the realization matters for tax purposes.
- Foreign currency FIFO: USD balances are separate economic assets. A stock purchase in dollars can trigger an FX gain just through the dollar outflow — invisible but taxable.
If you know the content from our webinar with stock3 or from Anlegertag München: The INVEST presentation goes deeper in several areas, and you can ask questions live.
Can't be there in person? Livestream available
The talk will be streamed live via WH SelfInvest and stock3. If you can't make it to Stuttgart, join online:
▶ Register for livestream (GoToWebinar)
Full day program in the WH SelfInvest / stock3 room
The complete Friday program in our room:
| Time | Speaker | Topic |
|---|---|---|
| 09:00 | André Stagge | Trump, tariffs and interest rates: Best strategies in volatile times |
| 10:00 | Vincenzo Zinnà | Hedging a portfolio or futures position |
| 11:00 | Bastian Galuschka | Trading for professionals: Systematic approach to trend stocks 2026 |
| 12:00 | Michael Hinterleitner | Algo mix as the holy grail |
| 13:00 | Stefan Behleit | Investing with statistical advantages — easier than you think |
| 14:00 | Fritz Gerhager | Trading success is trainable: Strategies for sustainable options trading |
| 15:00 | Andrei Anissimov | Regular income from option writing |
| 16:00 | Th. Ortmeier & D. Schröter | Trading meets tax logic: Where systems collide |
| 17:00 | Markus Herfert | Hedged income strategies with stock options |
About INVEST Stuttgart
INVEST is Germany's leading financial trade fair for private investors, taking place from April 16–18, 2026 at Messe Stuttgart. Beyond presentations and workshops, the fair offers opportunities to connect directly with providers and fellow investors.
📅 Friday, April 17, 2026, 4:00–4:45 PM 📍 Messe Stuttgart, ICS, Room C6.2
Try it yourself
Don't want to wait until Friday? Upload your IBKR FlexQuery XML and check the free preview: Upload IBKR data now.
Questions in advance? Reach us via the feedback form or email info@bubbletax.de.
Disclaimer: This blog post is for informational purposes only and does not constitute tax advice. BubbleTax is a calculation tool. For individual tax questions, please consult a tax advisor.