This is most interesting, especially as I have different figures from 2005 -2015:
Basic costs fo structure (running a GmbH vs. private accounts): Forming corporation: 3000 USD
Running corporation: Memberships, accounting etc 4000 USD p.a.
Trading related additional costs: Professional Trading Fees ( CME,CBOE, ICE ...) > 150 each PER month.
100 USD profit made by the firm will 50 USD net after taxes when paid out on your personal account (i.e. after all taxes of the corporation and your personal income tax (AbgeltungsSteuer)
The costs for creating a Mini-GmbH are negligible and the annual costs are minimal if you are just trading and furnish broker statements to your accountant.
As long as you keep the money in the company you only pay about 1,5% in taxes, thats better than the 26,5% you would have to pay if youre trading privately. So thats 25% more trading capital available in your account.
And if you funded the company with a loan then the payments up to that amount are taxfree when repaid.