TCF IRN or DELF B2: which French exam to choose for 2026 naturalisation

Since 1 January 2026, B2 level is required for any French naturalisation application1. Two exams prove it: the TCF IRN and the DELF B2. They assess the same skills but they aren't the same tool. The right choice depends on your horizon, not your level.

This article compares the two certifications line by line — format, score, price, frequency, validity — and proposes three typical profiles to help decide. The goal: pick the choice that fits your filing calendar and what you intend to do with the certificate afterwards.

Before 2026, many candidates proved their level of French with a diploma from a French-speaking country, or even a French-language course abroad. The decree of 15 July 2025 and the 2 May 2025 circular7 tightened the list: only diplomas issued by a French institution at the required level, and TCF IRN or DELF B2 certificates, now count as safe proof.

For most candidates, taking an exam has become unavoidable. The question is no longer “do I need a test?”, it's “which one?”11Nationals of French-speaking countries (Belgium, Switzerland, Quebec, Senegal, etc.) may still be covered by specific exemptions, but the administration verifies these case by case. When in doubt, planning to take an exam is safer than relying on an exemption.

Both exams assess the same four skills: listening, reading, speaking, writing. What differs is the nature of the tasks.

TCF IRN — about 1h35 total

The TCF IRN is computer-based. Three of the four sections are MCQ with automatic scoring:

• Listening — about 25 multiple-choice questions, 25 minutes. Short audio clips, everyday and formal situations.
• Reading — about 20 multiple-choice questions, 45 minutes. Press articles, administrative documents, emails.
• Writing — two or three short tasks, 30 minutes. Short messages, emails, brief argumentation.
• Speaking — face-to-face interview with an examiner, about 12 minutes. Self-presentation, exchange, discussion of a viewpoint.

MCQ results land within a few days; the production sections (writing, speaking) are corrected by France Éducation International, which extends the wait to 2 to 4 weeks typically.

DELF B2 — about 2h30 of group sections + 30 min of speaking

The DELF B2 is on paper (and on computer in some centres soon). All sections require constructed production:

• Listening — 30 minutes. Two documents (one long, one short), with open and multiple-choice questions.
• Reading — 1 hour. One informative text and one argumentative text, with detailed comprehension questions.
• Writing — 1 hour. An argued position (formal letter, contribution to a debate, 250 words minimum).
• Speaking — 30 minutes total (20 minutes prep, 20 minutes in front of the jury). Presentation of a viewpoint based on a short document, then debate.

As an official diploma, the DELF undergoes double correction and is centralised by France Éducation International, lengthening the wait to 4 to 8 weeks typically, sometimes more during peak periods.

TCF IRN — score per skill on a 699 scale

The TCF IRN places the candidate on the official scale published by France Éducation International4. To validate the B2 level required for naturalisation, you need a score between 400 and 499 points in listening and reading, and the equivalent of B2 in writing and speaking (graded out of 20). Below (300–399) places you in B1, which no longer suffices since 2026. Above (500–599 and up) is C1 or C2 — well above the naturalisation bar.

DELF B2 — total out of 100, with a minimum-floor rule

The DELF B2 is graded out of 100 points across four sections of 25 points each. To earn the diploma:

• Minimum total: 50/100 across the four sections.
• Floor rule: no section may drop below 5/25, or the exam fails — even if the total clears 50.

Test centres are private or consular, so there is no single national price. The figures above are typical ranges in major cities; Alliances Françaises abroad often charge lower local rates.

The TCF IRN certificate expires 2 years after its issue date. If you plan to file more than 18 months out, you may need to retake it. The clock starts at the certificate's issue date — not the date you sat the test, nor the prefecture's decision.

The DELF B2 is a diploma issued by the Ministry of National Education. It never expires. Beyond naturalisation, it is recognised by French universities for bachelor's and master's admission, and by many employers and institutions abroad.

Profile A — Tight calendar, filing in 3 to 6 months

You work full time, and your residency permit or job situation pushes you to file quickly. You have little room to prepare a long exam.

Recommended choice: TCF IRN. Weekly sessions, results in 2 to 4 weeks, MCQ format less demanding in writing. The main risk: the 2-year validity, generous for this profile.

Profile B — Career and long term

You aim for French nationality but also long-horizon projects: master's or doctoral studies, professional advancement, or a family settling durably in France. You have 6 to 12 months to prepare and a strong academic background.

Recommended choice: DELF B2. The lifetime diploma avoids retaking it for future steps. It is recognised by French universities and many employers. The pedagogical cost is higher, but so is the asset.

Profile C — Currently B1, filing in 9 to 12 months

You are currently at B1 (verified by a mock test) and want to move up to B2 to file in about a year. You have time to prepare well but not to absorb a second tight attempt in case of a near-miss.

Recommended choice: TCF IRN, aiming for 420–460 points. The MCQ format is more predictable when you're at the boundary of a level. The DELF, with its 5/25 floor rule, can be tricky if you're still hesitant in writing. Reserve the DELF for when your B2 is solid across the board.

For the TCF IRN, there is no “fail” notion: you get the score you get. If you land at 380/699, you are positioned in B1 and need to retake. The minimum gap between two sittings is 30 days in the same centre. Full price each time.

For the DELF B2, fail is binary: you have the diploma or you don't. No mention, no make-up, no partial validation of skills you passed. You retake the entire exam at the next session (2 to 6 months later depending on the centre), at full price.

1. Counting on a B1 obtained before 2026. A B1 certificate from 2024 or 2025, however recent, no longer suffices for naturalisation files filed from 1 January 2026 onwards. The threshold is now B2, with no grandfathering.
2. Confusing test validity with file processing. A TCF IRN certificate dates from its issue, not your filing date. If you obtain it in March 2024 and file in April 2026, it is expired — regardless of whether the naturalisation itself is still being processed.
3. Underestimating B2 writing. At B1, simple sentences sufficed. At B2, the examiner expects constructed argumentation — introduction, development, conclusion — with logical connectors. That's where most candidates disappoint on the DELF, and where TCF writing scores plateau.