Can You Use Idioms in IELTS Writing?

Yes, you can use idioms in IELTS Writing, but they rarely raise your score alone. Examiners reward precise, natural vocabulary under Lexical Resource. One well-chosen idiom in Task 2 is fine; stacking casual phrases usually looks forced and can keep Lexical Resource at Band 6.

This guide from IELTS AI Tutor by IELTSGRADER shows when idioms help, when they hurt, and what to practise instead if you want Lexical Resource 7.

Can you use idioms in IELTS writing? (quick guide)

Choice	Effect on Lexical Resource	Example
Precise academic collocation	Usually helps	reduce traffic congestion, widens access to education
One natural idiom, correctly used	Neutral to slight help	a double-edged sword for a clear trade-off
Multiple casual idioms	Often hurts tone / accuracy	piece of cake, hit the books, go the extra mile stacked
Wrong or invented idiom	Clear LR penalty	in a nutshall, blessings on disguise

Speaking allows more informal idioms. Writing Task 2 expects a semi-formal academic tone. Task 1 (charts/letters) almost never needs idioms.

What Lexical Resource actually rewards

Band 7 Lexical Resource is less about rare words and more about:

• Accurate meaning
• Natural collocations
• Controlled paraphrase (not thesaurus spam)
• Few errors that confuse the reader

Idioms sit in the “natural and appropriate” bucket. If the idiom is informal, off-topic, or incorrect, it works against you.

Deep dive: lexical resource Band 6 to 7. Side-by-side tone examples: Band 6 vs Band 7.

Before / after: idiom stuffing vs precise wording

Prompt: Some people say technology makes life more stressful. To what extent do you agree?

Band 6 pattern (forced idioms)

Technology is a double-edged sword and at the end of the day it is a piece of cake for some people but others are over the moon or down in the dumps because they burn the midnight oil using phones.

Several idioms, mixed register, weak argument. Examiners see vocabulary display, not idea control.

Band 7 pattern (precision first)

Technology can increase stress when constant notifications interrupt deep work and blur the boundary between office and home. For example, employees who answer messages late at night often sleep less and report higher anxiety. Used with clear limits, the same tools can reduce stress by automating routine tasks — so the effect depends on habits, not on devices alone.

Zero idioms required. Clear collocations, developed idea. That is the Lexical Resource upgrade most 6.5 candidates need.

Idioms that are usually safe (if used once)

• a double-edged sword — genuine trade-off
• a vicious cycle — self-reinforcing problem
• the tip of the iceberg — small visible part of a larger issue

Rules: one per essay maximum unless you write with native-like control; must fit the argument; never invent variations.

Idioms and phrases to avoid in Task 2

• piece of cake, kids these days, hang out
• I wanna, chat-style spelling
• Memorised “impressive” lists from Instagram IELTS accounts
• Proverbs that do not answer the question (Every cloud has a silver lining as a fake conclusion)

If you are stuck at mid-band, the plateau is usually development or Coherence — not missing idioms. See stuck at Band 6.5.

Try this yourself

Prompt: Many working people do not get enough exercise. What are the causes, and what solutions can you suggest?

Write 260–290 words. Do not use any idioms. Focus on precise cause–solution vocabulary (sedentary jobs, flexible work schedules, community sports programmes). Then try the IELTS essay checker and read the Lexical Resource notes: Were any words marked as informal or imprecise?

Frequently asked questions

Can you use idioms in IELTS writing?

Yes, but sparingly and only if they sound natural in a semi-formal essay. Precise collocations matter more for Lexical Resource than idiom lists.

Do idioms increase my band score?

Not automatically. A correct, relevant idiom is fine; forced or incorrect idioms can lower Lexical Resource. Development and accuracy move the band more.

Are idioms better for Speaking than Writing?

Generally yes. Speaking Part 1–2 tolerates more informal language. Writing Task 2 stays closer to academic tone.

Should I memorise 20 idioms before the exam?

No. Memorise topic collocations (education, environment, health, work) and practise paraphrasing the question accurately.

Can I use idioms in Task 1?

Almost never useful in Academic Task 1. In GT letters, match the tone: informal letters allow a few casual phrases; formal complaint letters should stay precise and polite.

Next steps

Stop collecting idiom lists. Start collecting collocations that fit your common essay topics, then practise under time.

Get your band score free on a no-idiom draft, review how writing is scored, or follow IELTS AI Tutor criterion plans. Free evaluations start at signup.