Do you need an "e.U."? The Firmenbuch, explained

Mark this step as done

You see "e.U." after business names everywhere and wonder whether you missed a founding step. You didn't. Here's the myth, busted: your Einzelunternehmen already exists — it came into being with your activity registration and the Finanzamt questionnaire. There is no separate "opening ceremony" — what you may have seen in USP is its founding wizard, which can file several of these registrations for you (more below).

What "e.U." actually means

e.U. = eingetragener Unternehmer — a sole proprietor who is registered in the Firmenbuch, Austria's commercial register (run by the courts, not by the WKO or USP). It is not a different legal form: same person, same unlimited liability, same taxes, same SVS. The entry just puts your business on the public record and lets you trade under a company name.

Do you have to register?

Situation	Firmenbuch entry
Revenue under €700,000/year	Voluntary — most freelancers never register
Revenue over €700,000 in two consecutive years (or €1M once)	Mandatory — and double-entry accounting kicks in with it (§189 UGB)

So for the typical solo founder: you can skip this step entirely. Come back to it when your revenue heads toward the threshold — or when one of the reasons below applies.

Why some register voluntarily

A company name. Unregistered, you trade under your own name ("Jane Doe"). Registered, you can run "Alpine Pixel e.U." — with the name protected in the register.
Optics. Some corporate clients and tenders read a Firmenbuch number as a sign of establishment.
It does not change your accounting duties: a voluntary entry below the thresholds does not force you into double-entry — the €700k rule decides, not the registration.

How it works, if you want it

Where: the register is run by the Firmenbuch court (Landesgericht; in Vienna the Handelsgericht). File digitally via JustizOnline with ID Austria, through the USP digital founding service (which can bundle NeuFöG fee exemptions, trade and tax-office registration and the Firmenbuch application in one flow), or through a notary.
What: application with your chosen company name (must include "e.U."), business address, activity. The court checks the name for distinctiveness and conflicts.
Cost: court and entry fees in the low hundreds; first-time founders are often exempt from several fees under the NeuFöG (Neugründungs-Förderungsgesetz) — say so when filing.
Afterwards: the suffix "e.U." and your Firmenbuch number (FN…) belong on invoices, your website imprint and business letters.

Rule of thumb: register when the name matters to your business — a brand you want to protect, tenders that ask for an FN. Until then, "Jane Doe" on your invoices is exactly as legal, and one register less to maintain.

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Status: 2026. Amounts and thresholds change — this is careful general information, not individual tax or legal advice. For your specific case, talk to a licensed Steuerberater.