You can delete your account on the page where you view your data (Personal data / Company data / Authority data).
If you delete your account, the data belonging to that account is also deleted. However, data processed in connection with your ap-plications is retained for as long as necessary for the respective procedure. The exact storage period depends on the statutory limitation periods for tax purposes. You can find more detailed information on this in the privacy policy.
Current authorisations will not be deleted, and deleting your account has no effect on accounts linked to the Customs Portal, such as ELSTER.