Is it possible to have two jobs at the same time in the same company, one full-time (Vollzeit) and the other as an assistant/temporary position (Aushilfe)?

No, as a matter of law you cannot have a Vollzeit contract and an Aushilfe contract (whether as a Minijob or kurzfristige Beschäftigung) at the same time with the same employer. Here’s why:

Employment is treated as one single employment relationship

Legally, all contracts you conclude with the same employer are regarded as “one single employment relationship” under § 1 SGB IV.
This means that any income you earn from your Aushilfe role is automatically added to your income from the Vollzeit contract and is subject to full social security contributions and regular taxation, as if it were part of your main contract (Haufe.de News und Fachwissen).

Separate Minijob registration is not possible

For an Aushilfe contract to qualify as a Minijob (with income of ≤ €556 per month), it must be registered separately with the Minijob-Zentrale.
However, where you work for the same employer, the system will reject a double registration and will not allow your income to be split into two separate contracts (NWB Experten Blog). All earnings from that employer are treated as one employment.

Practical alternative

• If you need to work additional hours, these are normally recorded as overtime (Überstunden) under your Vollzeit contract, with appropriate compensation according to your contract, collective agreement, or company rules.

• Alternatively, you can look for a Minijob / Aushilfe position with a different, independent employer, separate from your Vollzeit employer.

Conclusion

Any extra income from the same company is automatically attributed to your Vollzeit contract, and the German system does not allow you to classify part of that work as a separate Aushilfe or Minijob with different legal treatment.

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The authors and editors of this website strive to provide accurate information based on extensive research and multiple sources. Nevertheless, errors may occur or certain information may not be fully verified. Therefore, please regard the information in this article as an initial point of reference and always consult the competent authorities or professional advisers for definitive and up-to-date guidance.