German naturalization requires proof of B1-level German. Accepted proofs commonly include telc Deutsch B1, Goethe-Zertifikat B1 and a DTZ certificate with a B1 result (plus school/degree equivalents). telc and Goethe test the same level — pick by format, availability and price. The oral exam must be passed separately, and it is where most applicants stumble.
The B1 requirement in practice
Since the 2024 naturalization reform, the standard path to German citizenship requires five years of residence and German language skills at CEFR level B1 — evidenced by a recognized certificate. Certificates that authorities commonly accept include:
- telc Deutsch B1 (Zertifikat Deutsch) — offered by many Volkshochschulen and private centers, frequent exam dates.
- Goethe-Zertifikat B1 — offered by Goethe-Institut and partners worldwide.
- DTZ (Deutsch-Test für Zuwanderer) — with an overall result of B1, typically after an integration course.
- German school certificates or degrees taught in German, as equivalents.
Details can differ by case and by office, and rules evolve — confirm with your local Einbürgerungsbehörde before booking. This guide is preparation advice, not legal advice.
telc vs Goethe: how to choose
| telc Deutsch B1 | Goethe-Zertifikat B1 | |
|---|---|---|
| Recognition | Accepted for naturalization | Accepted for naturalization |
| Style | Everyday, practical tasks; conversational speaking exam in pairs | Structured, module-based; speaking also in pairs |
| Modules | Written + oral, passed separately | Four modules (reading, listening, writing, speaking) — can be taken and repeated individually |
| Availability | Very frequent dates at VHS and private centers in Germany | Regular dates, strong international network |
Neither exam is objectively easier — they certify the same level. Learners who prefer everyday scenarios and quick availability often pick telc; learners who want to repeat single modules often pick Goethe. The speaking task types overlap heavily: both include a planning dialogue and topic-based conversation, so speaking preparation transfers.
The part that delays applications: the oral exam
In telc B1, the oral exam is worth 75 of 300 points and must reach 60% on its own — no compensation from the written part (details in the scoring guide). That's why "I passed everything except speaking" is the most common retake story: applicants read and listen to German daily, but many haven't held a 15-minute German conversation under pressure even once before exam day.
The fix is unglamorous: speaking reps. The exam's three parts — interview, topic discussion and planning dialogue — are all predictable enough to rehearse systematically in the weeks before the exam.
Make the oral exam the safest part of your application
- Download ZertFox and choose the B1 level — its three practice parts mirror the telc B1 oral exam.
- Practice one part per day with the AI partner: interview questions, a discussion topic, a planning situation.
- Use the AI-estimated scores to find your weak criterion — grammar, expression or pronunciation — and target it.
- In the last week before the exam, run all three parts back to back as a full oral simulation.
Frequently asked questions
Does a B1 certificate expire?
The certificates themselves don't carry an expiry date, but some authorities prefer recent proof. If your certificate is several years old, ask your naturalization office whether it will be accepted.
Is the DTZ enough for citizenship?
A DTZ certificate with an overall B1 result is commonly accepted as B1 proof. A DTZ with an A2 result is not sufficient for naturalization.
How long does B1 speaking preparation take?
If your German is already around B1 passively, four weeks of daily out-loud practice is a realistic runway for the oral exam.
Learn more: the 4-week speaking plan →