You've got 20 minutes to write a formal letter. Maybe 180-220 words. You finish, read it back, feel confident. Then the results come back: Band 6.5 instead of the Band 7 you need.
The examiner's feedback stings: "Task Response: The purpose of the letter is unclear."
This is where most students mess up. Not because they can't write. But because they haven't clarified what the letter is actually supposed to achieve before they start typing.
Here's the disconnect: the IELTS band descriptors spell it out clearly. Band 7 requires "writes appropriately, with proper format and tone, and communicates the main purpose(s) clearly." Band 6? "Writes appropriately, with mostly appropriate format and tone, though the main purpose may not be fully communicated."
One word separates them: clearly. That's it. Master clarity in your letter, and you move from Band 6 to Band 7.
The IELTS examiner isn't being picky. They're following a rubric that asks one simple question: What is this letter trying to achieve?
When your letter's purpose is fuzzy, the examiner can't confidently mark you higher on Task Response. And Task Response is worth 40% of your Writing score. That's massive. A Band 7 on Task Response paired with a Band 6 on Coherence & Cohesion drops you to around Band 6.5 overall, not Band 7.
Most unclear letters fail because the writer hasn't identified their own purpose before drafting. They know they're writing to a hotel manager or university professor, but they've never written down the specific outcome they want. Should the recipient refund your money? Approve your application? Explain their decision? All three?
Weak: "I am writing to you because I stayed at your hotel last month and I had some problems with my booking. The room was not what I expected. I would like to discuss this with you and see what can be done about it."
What does the writer actually want? A refund? An apology? A better room next time? The reader doesn't know. That ambiguity lands you in Band 5-6 territory because the main purpose gets lost.
Good: "I am writing to request a full refund for my three-night stay at your hotel from 12-15 June. I was promised an ocean-view room, but I was given an interior room on the ground floor with no view and excessive noise from the corridor."
Now it's crystal clear: refund. The examiner knows exactly what you want and can measure whether you've supported that goal. That clarity pushes you toward Band 7.
Stop. Don't start writing yet. Answer these four questions on paper first. Two minutes, that's all you need.
Write these down. One sentence each. This becomes your anchor. It keeps your IELTS letter from drifting into vague territory while you're writing.
Tip: The IELTS Task 1 prompt gives you clues about purpose. If it says "you have received an unsatisfactory service," your purpose probably includes complaint and a request for action. If it says "explain why you are interested," your purpose is persuasion. Read the prompt twice and underline the verbs. Those verbs tell you what you should do.
Band 7 letters announce their purpose in the first paragraph. Not buried in paragraph two. Not hinted at across three paragraphs. Right there in the opening.
A strong opening for a complaint letter looks like this:
Good: "I am writing to lodge a formal complaint regarding my recent stay at the Grand Hotel (Booking Reference: HT-456789) and to request a full refund of £320 due to significant failures in the service provided."
Six words establish the purpose: "lodge a complaint" and "request a full refund." No ambiguity. The examiner ticks the Task Response box. Done.
Compare that to a Band 5-6 opening:
Weak: "I am writing to tell you about my experience at the Grand Hotel during my stay last month. I had some issues that I think you should know about."
This uses vague language: "tell you," "some issues," "should know about." The examiner reads it and thinks, "What does this writer actually want?" That's Band 6 at best, maybe Band 5.
Your opening should use direct, purpose-revealing verbs:
These verbs make your purpose unmissable.
Type 1: Complaint / Compensation Letter
Purpose: Identify the problem and the specific remedy you want.
Good: "I am writing to formally complain about the faulty washing machine I purchased from your store on 10 May (Model: WX-250, Invoice: 54321) and to request either a full repair or a replacement within 7 days."
Type 2: Application / Request Letter
Purpose: State what you're applying for and why you're a fit.
Good: "I am writing to apply for the position of Marketing Assistant advertised on your website on 5 June. I have attached my CV and cover letter, and I would welcome the opportunity to discuss how my experience in social media management aligns with your team's needs."
Type 3: Inquiry / Information-Seeking Letter
Purpose: State what information you need and why.
Good: "I am writing to inquire about accommodation options for the upcoming summer semester. I am particularly interested in on-campus housing within walking distance of the Science Building, and I would appreciate details about availability, costs, and the application deadline."
In every case, the purpose emerges in the first 1-2 sentences. No guessing. No vagueness. That's Band 7 discipline.
Clarity also means consistency. Every paragraph should reinforce your main purpose, not introduce competing ones or contradict it.
This is where Coherence & Cohesion connects to Task Response. If your letter wanders, the examiner sees two problems: unclear purpose and weak coherence. That costs you points in two band descriptors, not one.
After you draft your letter, read it and ask: Does each body paragraph explain why your purpose is justified? Does it provide necessary context to achieve it? Or does it introduce a separate complaint, request, or grievance?
Weak structure: Paragraph 1: Request a refund for a faulty laptop. Paragraph 2: Explain the faults. Paragraph 3: Mention that your keyboard is also broken and you want a new keyboard. Paragraph 4: Complain that customer service was rude when you called. [You've got one main purpose but competing demands (keyboard) and separate grievances (rude service) that dilute focus.]
The reader gets confused. "Do they want a refund or a replacement? Should I investigate customer service separately?" Purpose becomes muddy. Band 6 range.
Good structure: Paragraph 1: Request a refund for a faulty laptop purchased 12 June. Paragraph 2: Explain the specific faults (screen dead, battery fails after 20 minutes). Paragraph 3: Describe your attempts to get a repair without success. Paragraph 4: Politely state your expectation of a full refund within 10 days. [Every paragraph directly supports the main purpose. No competing requests. No tangents.]
Purpose is locked in. Every sentence works toward one goal. That's Band 7.
Mistake 1: Hiding your purpose in paragraph two or three
You open with context or background, then finally reveal what you want later. Examiners expect to know your purpose by the end of paragraph one. Delay it = confusion = lower band.
Mistake 2: Using weak or indirect language
Words like "perhaps," "if possible," "I would like if," and "it would be nice" soften your purpose. For formal letters, directness is clarity. "I request" is sharper than "I was wondering if it might be possible." Both can be polite, but "request" signals purpose more clearly.
Mistake 3: Multiple conflicting purposes
If the prompt asks you to complain and request a refund, that's two purposes but they're linked. Complaint justifies the request. Fine. But if you're also apologizing for something you did, or asking an unrelated question, you've created confusion.
Mistake 4: Forgetting to echo purpose subtly in your closing
Your closing paragraph should reinforce your purpose without repeating it verbatim. "I look forward to your prompt response" works for a request. "I trust you will address this matter seriously" works for a complaint. This reinforces clarity and shows strong Coherence & Cohesion.
Tip: After you draft your letter, highlight every sentence that mentions or implies your main purpose. If fewer than three sentences do this, your purpose isn't clear enough. Strengthen your opening or sharpen your body paragraphs.
Example 1: Complaint Letter (Band 6 vs. Band 7)
The prompt: "You received a damaged item from an online shop. Write a letter to the shop manager complaining and requesting a replacement or refund."
Band 6 Opening: "I am writing regarding my recent order from your online store. I ordered a coffee maker last week, and when it arrived, I noticed it had a problem. The glass jug was cracked, which makes it impossible to use. I am disappointed because I was looking forward to using this product."
Why Band 6? Purpose is implied but never stated directly. We infer complaint and request for action, but the writer doesn't say "I request a replacement" or "I demand a refund." The focus drifts to personal disappointment instead. Examiners want to see the purpose named explicitly. That's what separates Band 7.
Band 7 Opening: "I am writing to lodge a complaint about the coffee maker I ordered from your store (Order #789456, purchased 15 June) and to request a full refund or replacement. The item arrived with a severely cracked glass jug, rendering it unusable."
Why Band 7? Purpose is named explicitly in the first two sentences: "lodge a complaint" and "request a full refund or replacement." The writer then provides evidence. Clarity is immediate and professional. The examiner ticks Task Response: "clearly communicates the main purpose."
Example 2: Application Letter (Band 6 vs. Band 7)
The prompt: "Your friend suggested you apply for a job advertised in a newspaper. Write a letter to the company applying for the position and explaining why you are interested."
Band 6 Opening: "I am writing because I saw an advertisement for a job in the newspaper. My friend told me about the position, and I thought it might be a good opportunity for me. The job sounds interesting, and I have some relevant experience."
The writer is applying, but it's buried in vague phrasing: "might be a good opportunity," "sounds interesting," "have some relevant experience." Purpose is unclear and weak. Is this writer serious or just exploring options?
Band 7 Opening: "I am writing to formally apply for the position of Customer Service Coordinator advertised in the Guardian on 8 June. I am particularly drawn to this role because it combines my three years of customer-facing experience with my passion for problem-solving in a fast-paced environment."
Purpose: apply for the position. Interest: stated explicitly with specific reasons. The writer positions themselves as a serious candidate. Task Response is clearly met. Band 7 level.
When you're reviewing your own letter, run through these specific clarity markers.
If you spot gaps in any of these areas, revise before submitting. These five markers are your Band 7 checklist for Task Response clarity.
Sometimes the IELTS prompt does require two purposes. You might need to complain about a service and request compensation. That's linked, the complaint justifies the request.
But here's the rule: one main purpose, plus supporting sub-purposes if they're directly linked to it. If you're complaining about a hotel and asking about booking a new room, that's two separate purposes competing for attention. You'll confuse the examiner and lose points.
Stick to one main purpose. Everything else should support it, not compete with it. When in doubt about how to clarify your letter's intent, read the IELTS prompt three times and identify the verbs. Those verbs tell you your purpose. You can also use our IELTS writing checker to evaluate if your letter communicates its purpose clearly before you submit.
IELTS examiners aren't looking for perfect letters. They're looking for clear ones.
Spend two minutes planning. Answer the four clarity questions. Announce your purpose in the opening. Support it consistently in every paragraph. Close with a nod to what you've asked for.
Do this, and you've locked in Task Response. That's 40% of your Writing score. Pair it with solid Coherence & Cohesion and you're hitting Band 7.
Your letter doesn't need to be fancy. It needs to be unmistakably clear about what it wants. That clarity is what separates Band 6 from Band 7.
Our IELTS writing checker flags vague openings, conflicting purposes, and tone mismatches instantly. It's like having an IELTS examiner review your formal letter before you submit. You can also check our band score guides to see exactly what examiners expect at each level.
Get instant feedback on your Task 1 letter's purpose clarity and band score potential with our free IELTS writing evaluator.
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