An internship reference letter is a written document that a company is required to issue upon completion of an internship — the obligation arises from § 630 of the German Civil Code (BGB) and/or § 16 of the Vocational Training Act (BBiG). It documents the duration, activities and — in the case of a qualified reference — also the performance and conduct of the intern. For HR professionals, it is essential to know the mandatory contents, correct phrasing and applicable deadlines in order to issue legally compliant references.
What Is an Internship Reference Letter?
An internship reference letter is an official document confirming that a person has completed an internship at a company. It certifies the duration of the internship, the tasks performed and — depending on the type of reference — an assessment of the intern's performance and conduct.
The internship reference letter differs from a standard employment reference in that it is issued to individuals who held a time-limited internship rather than a regular employment contract. For many interns — particularly students and school leavers — it serves as an important document in job applications.
Distinction: Internship Reference vs. Employment Reference vs. Apprenticeship Reference
Is an Internship Reference Letter Mandatory? The Legal Framework
Interns have a statutory right to receive a reference. The obligation is derived from two central provisions of German law.
§ 630 BGB – General Obligation to Issue a Reference
Under § 630 of the German Civil Code (BGB), service providers are entitled to a written reference upon termination of a service relationship. Since internships are generally classified as service relationships under German law, this entitlement also applies to interns. The reference must be issued upon request — employers are not automatically required to hand it over without being asked.
§ 16 BBiG – Special Rules for Training-Related Internships
For internships completed as part of a formal training programme or school requirement, § 16 of the Vocational Training Act (BBiG) additionally applies. This provision explicitly regulates the obligation to issue references in training relationships and may require a qualified assessment.
Which Rules Apply to Which Type of Internship?
Not all internships are treated equally under German law. Here is an overview:
- School internship: A compulsory placement as part of secondary education. The right to a reference under § 630 BGB applies, even if no remuneration obligation exists.
- Compulsory university internship: Universities often require practical semesters or mandatory placements. A qualified reference is recommended for use in job applications.
- Voluntary internship: The right to a reference under § 630 BGB also applies here. For internships lasting more than three months, the Minimum Wage Act (MiLoG) additionally applies.
Note: For very brief, informal work-shadowing arrangements (e.g. a single observation day), the legal position is less clear-cut. When in doubt, issuing a simple reference is recommended.
Simple vs. Qualified Internship Reference
There are two fundamental types of internship reference letters. The difference lies in whether the document includes an evaluative assessment or not.
The simple reference only certifies the duration and nature of the tasks performed, without any assessment of performance or conduct. It answers the question: What did the person do?
The qualified reference additionally includes an assessment of work performance and social conduct. It answers the question: How did the person perform?
Interns may request a qualified reference — and in practice this is almost always the case, as a qualified reference is considerably more valuable for job applications. Employers are not required to issue a qualified reference unless it is explicitly requested.
Mandatory Contents: What Must Go Into an Internship Reference?
A legally compliant internship reference must include certain minimum contents. The following checklist shows what is required:
Mandatory information in a simple reference:
- Full name of the intern
- Start and end dates of the internship (precise dates)
- Nature and scope of the tasks performed
- Company stamp or letterhead
- Date of issue
- Signature of the responsible person (typically the line manager or HR)
Additional information in a qualified reference:
- Assessment of professional performance
- Assessment of social conduct (towards colleagues, supervisors, clients)
- Overall evaluation
- Optional: reason for the end of the internship (only appropriate in a positive context)
What Must Not Appear in the Reference?
German reference law sets clear limits. The following information is prohibited in an internship reference:
- Sick days or health-related information
- Pregnancy
- Works council membership or trade union activities
- Personal circumstances or personal opinions of supervisors
- Hidden negative signals (so-called coded language that violates Federal Labour Court case law)
- Criminal allegations (except in the case of a final conviction with a direct connection to the role)
Reference Phrasing: The German Code Explained
In Germany, a standardised reference language has developed over decades: certain phrases correspond to specific grades on the German school grading scale. Anyone who issues or evaluates German internship references should be familiar with this code.
Important for HR professionals: Under § 630 BGB, references must be worded in a benevolent manner — however, this does not mean that untrue statements may be made. Deliberately misleading references can have legal consequences if third parties (e.g. future employers) suffer harm as a result.
Issuing an Internship Reference – Step by Step
With a clear process in place, issuing an internship reference is straightforward:
1. Receive the request from the intern: The reference is issued upon request. Clarify in advance whether a simple or qualified reference is required.
2. Document performance and conduct: Gather feedback from the direct line manager or supervising team. Note specific tasks, projects and behavioural observations.
3. Draft the reference: Use the mandatory contents checklist above as a basis. Formulate performance and conduct assessments using the correct reference language.
4. Internal review: Have the draft reviewed by the line manager. If there is any uncertainty about phrasing, seek legal advice.
5. Issue and hand over: The reference is printed on company letterhead, dated and signed by an authorised person. Digital issuance with a legally valid electronic signature is also possible.
Deadline: There is no statutory deadline. However, case law expects the reference to be issued promptly after the internship ends — in practice, two to four weeks is considered reasonable. Delays can give rise to claims for damages if the intern can demonstrate resulting disadvantages (e.g. a missed job application opportunity).
Frequently Asked Questions About Internship Reference Letters
Is an internship reference letter really mandatory?
Yes — interns generally have a statutory right to a reference (§ 630 BGB). The reference must be issued upon request. For training-related internships, § 16 BBiG additionally applies. Very brief, informal work-shadowing arrangements fall into a legal grey area, but issuing a simple reference is recommended even in these cases.
What is the difference between a simple and a qualified internship reference?
A simple reference documents only the duration and tasks, without any assessment. A qualified reference additionally includes an evaluation of performance and social conduct. Interns may request a qualified reference — and this is significantly more valuable for job applications.
What do the typical phrases in a German reference mean?
German references use a coded language: "stets zu unserer vollsten Zufriedenheit" (always to our complete satisfaction) corresponds to an excellent grade, while "zu unserer Zufriedenheit" (to our satisfaction) corresponds to a satisfactory grade. The full table can be found in the "Reference Phrasing" section above.
Within what timeframe must the internship reference be issued?
There is no legally fixed deadline. However, case law expects prompt issuance after the internship ends — typically within two to four weeks. Excessive delays can lead to claims for damages.
Can an internship reference contain negative assessments?
The reference must be truthful and worded in a benevolent manner (§ 630 BGB). Explicitly negative formulations are permissible if they are factually justified. Hidden negative signals or coded language that violates Federal Labour Court case law is not permitted. When in doubt, legal advice should be sought.
What is strictly prohibited in an internship reference?
Prohibited content includes, among other things: sick days, health-related information, pregnancy, works council membership, personal information and unsubstantiated negative assessments. Such information violates the personal rights of the individual concerned.
Can an internship reference be challenged?
Yes. If the intern disagrees with the content, they can request changes — for example, in the case of inaccurate assessments or missing mandatory information. In the event of a dispute, the matter can be referred to the labour court. Companies should therefore always formulate assessments in a factual and substantiated manner.
Conclusion
An internship reference letter is more than a formality — it is a legally required document that plays an important role in the professional development of interns. For HR professionals, this means: knowing the mandatory contents, applying the correct phrasing and meeting deadlines. The distinction between a simple and a qualified reference, as well as an understanding of German reference language, are particularly important in day-to-day practice.
Standardising the reference process — with a clear template, internal review and a fixed issuance deadline — saves time and reduces legal risk.
Would you like to assess applicants and interns based on objective criteria rather than relying on subjective reference letter phrasing? The digital platform Aivy supports HR teams with scientifically validated assessments and game-based tests that evaluate actual competencies rather than coded language. Try Aivy for free.
Sources
- § 630 BGB – Obligation to issue a reference. Federal Ministry of Justice, 2024. https://www.gesetze-im-internet.de/bgb/__630.html
- § 16 BBiG – Reference under the Vocational Training Act. Federal Ministry of Justice, 2024. https://www.gesetze-im-internet.de/bbig_2005/__16.html
- Zeugnisrecht kompakt [Reference Law in Brief]. Haufe Editorial Team, 2023. https://www.haufe.de/personal/arbeitsrecht/arbeitszeugnis_
- Schnabel / Heide: Das Arbeitszeugnis [The Employment Reference]. Haufe Verlag, 2022.
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