Common IELTS Writing Mistakes: How to Avoid Costly Errors and Boost Your Score (2026)

So, you're gearing up for the IELTS Writing test. You've probably spent hours poring over grammar rules, memorising vocabulary, and practising Task 1 reports or Task 2 essays. That’s fantastic dedication!

But as an IELTS instructor with over a decade of experience guiding students through this exam, I’ve seen it again and again: even the most diligent candidates can lose marks due to small, repeatable issues. These IELTS writing mistakes often feel minor, but they can seriously chip away at your score.

The good news? Most of these writing errors are completely avoidable. They usually happen because of rushed planning, unclear structure, misunderstanding the question, or simply not proofreading properly.

In this guide, we’ll break down the 15 most common IELTS writing problems, show you why they happen, give examples of errors and corrections, and—most importantly—share practical ways to avoid them.

Let’s dive in.

The Foundation: What Examiners Actually Mark

Your IELTS Writing score is based on four equally weighted criteria:

• •

  Task Achievement (Task 1) / Task Response (Task 2): Did you answer the question fully and appropriately?

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  Coherence and Cohesion: Is your writing logically organised and easy to follow?

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  Lexical Resource: Is your vocabulary varied, accurate, and suitable for academic writing?

• •

  Grammatical Range and Accuracy: Do you use a range of sentence structures accurately?

Every mistake below affects at least one of these criteria—often more than one.

Top 15 Common IELTS Writing Mistakes (And How to Fix Them)

1) Not Fully Answering the Question (TR/TA)

Why it happens: candidates rush, don’t deconstruct the prompt, or focus too much on one side.

Example prompt: “Discuss both views and give your opinion.”

Common error: discussing only one view.

Fix:

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  underline instruction words (“discuss both”, “advantages”, “causes”, “give your opinion”)

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  create a quick paragraph plan to cover every part

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  after writing, check each part is clearly addressed

2) No Clear Thesis Statement (TR)

Without a clear position (especially in Task 2), your essay feels unfocused.

Weak thesis: “This essay will discuss the pros and cons.”

Better thesis: “Although technology has improved access to information, I believe its negative impact on social interaction outweighs these benefits.”

Fix: Decide your position before writing.

3) Poor Paragraph Structure (CC)

A strong paragraph = one main idea + development.

Common error: one paragraph contains 3 unrelated ideas.

Fix: Use PEEL

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  Point (topic sentence)

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  Explain

• •

  Example

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  Link back to the question

4) Linking Words Used Badly (CC)

Linkers can help, but they can also make your writing robotic if you overuse them.

Weak: “However… Moreover… Therefore…” (every sentence)

Fix:

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  use linkers only when the logic truly needs them

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  vary your linking devices (not just “Firstly/Secondly”)

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  sometimes a clear sentence is better than an extra connector

5) Subject–Verb Agreement Errors (GRA)

Common errors:

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  “People is…”

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  “The number of students are…”

Fix:

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  identify the true subject (ignore phrases in the middle)

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  memorise key patterns:

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  The number of = singular

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  A number of = plural

6) Tense Inconsistency (GRA)

Switching tenses without reason confuses the reader.

Bad: “Yesterday the government introduces a policy…”

Fix:

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  Task 1: mostly past (for past data) + present (for general statements)

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  Task 2: mostly present (general truths) + future (predictions)

7) Article Mistakes: a / an / the (GRA)

This is one of the most common issues for non-native speakers.

Fix:

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  a/an = first mention or non-specific

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  the = specific / already mentioned / unique

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  practise with common IELTS nouns: government, internet, education system, environment

8) Repetitive, Basic Vocabulary (LR)

Using “important / good / bad / thing / people” repeatedly limits your band.

Fix:

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  build topic vocabulary (environment, education, technology, health)

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  learn collocations, not single words:

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  “pose a threat”

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  “address the issue”

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  “play a crucial role”

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  “a significant proportion”

9) Misusing Advanced Vocabulary (LR)

Wrong “big words” hurt more than simple correct words.

Bad: “This policy will demolish pollution.”

Better: “This policy could reduce pollution significantly.”

Fix:

• •

  only use advanced vocabulary you can use confidently

• •

  check meaning + example sentences when learning new words

10) No Real Examples (TR/TA)

High-scoring essays develop ideas with explanations and examples.

Weak: “Public transport is better for society.”

Better: “For example, expanding metro systems can reduce congestion and air pollution in major cities.”

Fix: Aim for one concrete example in each body paragraph.

11) Informal Tone (TR/LR)

Task 2 is academic writing.

Avoid:

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  slang (“awesome”, “kids”, “stuff”)

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  contractions (“don’t”, “it’s”)

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  chatty phrasing (“In my life…”)

Fix: Use formal alternatives:

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  “children” instead of “kids”

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  “do not” instead of “don’t”

12) Punctuation Problems (GRA)

Comma splices and missing full stops are common.

Bad: “The trend increased, it then fell.”

Fix:

• •
  use a full stop or semicolon:
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  “The trend increased. It then fell.”
• •
  “The trend increased; it then fell.”

13) Overusing Passive Voice (GRA)

Passive can sound formal, but too much makes writing vague.

Better balance:

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  Active when the “doer” matters: “Governments should invest…”

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  Passive when the action matters: “A new law was introduced…”

14) Weak Introductions and Conclusions (TR/CC)

Common errors:

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  introductions that repeat the question with no position

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  conclusions that add new ideas

Fix:

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  intro: paraphrase + thesis (clear position / roadmap)

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  conclusion: summarise main points + restate position (no new arguments)

15) Not Proofreading (All Criteria)

This is the easiest score boost.

Fix: Always reserve 3–5 minutes to check:

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  subject–verb agreement

• •

  articles

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  spelling of topic words

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  tense consistency

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  plural/singular nouns

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  unclear sentences

Quick Reference Table

Key Takeaways

• •

  Most IELTS writing mistakes are predictable—and fixable.

• •

  Focus on the 4 marking criteria while planning and writing.

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  Use clear structure, develop ideas with examples, and keep tone formal.

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  Proofreading is the fastest way to raise your score.

Your Next Step (Simple Drill)

Pick one Task 2 question you’ve written before. Re-write only the introduction + two topic sentences using:

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  a clear thesis

• •

  one strong paragraph focus for each body paragraph

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  formal vocabulary (no slang / no contractions)