Is IELTS Speaking formal or informal?
Quick answer
Neither, strictly. It is a face-to-face conversation with an examiner, so natural, neutral spoken English is the safest register. IELTS does not publish a formality label for Speaking. The public band descriptors ask for speech that is situationally appropriate and for awareness of style, so essay-style language is not needed.
Part of The IELTS Speaking test, answered
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The Speaking test is a conversation, and the register that suits a conversation with a teacher you have just met is neutral: clear, polite, not stiff and not slangy. IELTS gives no formality label for Speaking, so this is a reading of what it does publish.
What IELTS publishes
IELTS.org describes the Speaking test as a face-to-face interview between you and an examiner. It lists four criteria, and none of them is formality. What the public band descriptors say about register is indirect. At Band 9, speech is “situationally appropriate”. At Band 7, an “awareness of style and collocation” is evident. Below that, “inappropriacies” in word choice are what pull the Lexical Resource mark down.
So the test asks whether your language fits the situation. In an interview about your home, work and interests, the situation is a friendly but structured conversation.
Writing is different
IDP says that Academic Writing Task 1 demands formal English: no slang, no idioms, no personal opinion, and formal English does not use contractions. That is where the advice to avoid contractions and to keep a formal tone belongs. Carrying it into Speaking makes your answers sound like a read-aloud essay, which is not the same as natural spoken English.
Where formal language goes wrong
IDP has an article on this. It notes that students often overuse discourse markers to make themselves sound more formal, and it points to the Band 5 descriptor, which mentions overuse of certain connectives and discourse markers. Its advice is to use markers to organise your language and not to use them just to sound formal.
A phrase like “on the other hand” is fine once. Repeated in every answer, it becomes a pattern that the examiner hears as overuse.
What to aim for
Speak as you would to a teacher or a manager you respect. Use contractions if you normally do. Use everyday words in preference to rare ones, and add an idiom only when it fits and you are sure of it. Keep the opening simple and answer the question first, then add a reason or an example.
You do not need special politeness. IDP says politeness is not part of the evaluation criteria, though a normal greeting and ordinary courtesy keep the conversation comfortable. If you want to see how the two ends of the scale look, read the band descriptors for Lexical Resource at Bands 6 and 7, and the answer on slang and idioms.
What this means for your score
Asked about your hometown, "It is a fairly quiet place, but there is a lot going on at the weekend" fits the conversation. "Nevertheless, whereas the city is quiet, on the other hand" sounds like a written essay, and it is the kind of overuse IDP warns about.
Frequently asked questions
Should I use contractions like "I'm" and "don't" in IELTS Speaking?
Yes, if that is how you naturally speak. The test is spoken English, and the descriptors reward speech that sounds natural and situationally appropriate. Avoiding contractions to sound formal usually makes speech stiffer, and it does not raise a band.
Is the Speaking test more formal than the Writing test?
Not in the same way. IDP says Academic Writing Task 1 demands formal English, with no slang or idioms. Speaking is an interview, and the descriptors ask for situationally appropriate speech rather than a fixed register, so the habits you use for Writing do not transfer directly.
Do I need to address the examiner as "sir" or "madam"?
No. IDP lists politeness as a myth and says it is not part of the evaluation criteria, so you should not worry about being overly polite. A normal greeting and ordinary courtesy keep the conversation comfortable, and that is enough.
Can informal expressions lower my score?
Only if they are inappropriate or inaccurate. The descriptors mark inappropriate word choices, and they credit idiomatic language used with awareness of style. Everyday expressions that fit the topic are fine; very casual or group-specific language is the real risk, so keep it plain.
Sources
- IELTS Speaking band descriptors (public version) — IELTS.org
- IELTS Academic: Speaking test format — IELTS.org
- Striking the balance: formal and informal English in IELTS — IDP IELTS
- Myths about the IELTS Speaking test — IDP IELTS
Last verified 30 Sep 2026
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