Up to 2500 €.

You could put in 2500 € in capital – then your personal exposure will be zero. In practice, I don’t think it’s a meaningful difference, you will just have to keep the whole 2500 € on the company balance by the end of each FY. (Unless you wanna deal with non-monetary contributions!)

If you put in 500 €, you’re liable for 2000 € personally, but you don’t have to keep them for your annual report. (It also means your company looks a bit riskier, since you might not have the 2000 € personally, so you might have trouble getting credit or whatever, but otherwise I don’t think it’s a big deal.)

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Edit: to the author: you should really look into Estonia (or any other sane jurisdiction mentioned elsewhere in the thread). You can still set up a KG (or a sole proprietorship), then put an Estonian OÜ in front of it. Costs something like 300 €, can be done online (you’ll probably need an e-residency card, an Estonian e-signature thing for foreigners, which is another ~150 €). Annual reports are fairly easy if you keep your books properly. And you’ll need an address in Estonea which is also like 125 €/yr. No additional taxes most likely (but check with a real accountant).