[helge5]

What do you mean by 'donate money to the company'? Why/for what purpose? There are various ways to bring money into the company, e.g. you can increase the share/base capital of the company. You can also give the company a credit, but careful, it needs to be on conditions you'd give a similar 3rd party. Probably a topic for your tax accountant. If we are talking low-profile, say a UG w/ 1000 Euro base capital, you'd usually increase the baseline capital steadily up to the 25k Euro and turn it into a regular GmbH (though that doesn't really matter a lot unless you want to take on regular credits).