Changing your OSS registration data: what to report where, and by when
Registered in the OSS and got a new bank account, email address or website? Report the change to the BZSt electronically by the tenth day of the month after the change. A change of company name, tax number or address goes only to your tax office.
Last updated: 29 October 2026
In short
- To the BZSt: Email, bank details, contact person, website and permanent establishments, in the BZStOnline portal (BZSt: One-Stop-Shop, German).
- To the tax office: Company name, tax number and address.
- Deadline: The tenth day of the month after the change.
What do I change with the BZSt?
The BZSt names email address, bank details, details of the contact person, website and permanent establishments or facilities as examples. In the BZStOnline portal there is a change form under "Formulare" (forms).
Important: when you change something, you enter all registration data as they currently stand, not only the changed field.
What this means for you: Have all current details ready before you fill in the form.
What does only the tax office handle?
The BZSt writes: changes of the company name, the tax number and the address are to be reported exclusively to the competent tax office. So you do not report them through the change form in the BZStOnline portal.
What this means for you: If you move or rename your business, you report it to your tax office, not through the OSS change form.
By when must I report it?
By the tenth day of the month that follows the change of circumstances at the latest. Two examples:
| Change on | Report to the BZSt by |
|---|---|
| 12 March | 10 April |
| 31 May | 10 June |
What this means for you: Put the date in your calendar on the day of the change.
Why does the right email matter?
In the OSS the BZSt communicates exclusively through the BZStOnline portal (reminders, replies). It recommends switching on the notification function in the portal. Only then do you see messages in time. Anyone who repeatedly fails to meet the obligations on time can be excluded under section 18j(6) UStG. More: Exclusion from the OSS.
What this means for you: After every email change, check that the portal notification still reaches you.
What if I deregister?
Duties remain after deregistration. For periods in which you were registered you must still submit a return, and amounts due must still be paid. The BZSt also writes that registration data must be changed within three years after the deregistration takes effect. How deregistration works: Deregister from the OSS.
What this means for you: Keep your data up to date after deregistering as well.
How VAT GPT helps
VAT GPT is a tax software in the browser for online sellers, self-employed people and small businesses.
- Upload: You upload your invoices. The AI reads amounts, countries and tax rates. You check and confirm.
- Check: VAT GPT calculates the OSS return for all EU countries and creates the VAT return, monthly or quarterly. You check and confirm.
- Send: With VAT GPT Pro you send the OSS return directly to the BZSt and the VAT return to the tax office through ELSTER.
Not included: You change your registration data yourself in the BZStOnline portal. There is Free (basic functions, free of charge) and Go (30 days free with all Pro features). Try for free now
Not tax advice: the content does not replace individual advice.
Frequently asked questions
Where do I change my bank details in the OSS? In the BZStOnline portal under "Formulare", with the change form.
Do I have to report the change myself? Yes. The duty lies with the registered business.
Where do I report a new address? To the competent tax office, not through the OSS change form.
Is it enough to fill in only the changed field? No. When something changes, you enter all registration data as they currently stand.