What is it and when to act?
All self-employed people — both Freiberufler and Gewerbetreibende — must register with the Finanzamt. This is done via the Fragebogen zur steuerlichen Erfassung on the ELSTER portal. You receive a Steuernummer — without it you cannot legally issue invoices.
Kleinunternehmerregelung
If your expected annual turnover is below €22,000, you can use the Kleinunternehmerregelung: no VAT charged to clients, no quarterly VAT returns. Select this option in the questionnaire.
The ELSTER registration is the slowest part: the activation letter takes up to 2 weeks. Create your account as soon as you decide to go self-employed — don't wait for the Gewerbeschein.
I chose the Kleinunternehmerregelung because I worked with private clients. In the second year my income exceeded €22,000 and I had to switch to standard VAT. Calculate in advance how quickly you expect to grow.