Here's the thing: most IELTS students write informal letters that sound like robots trying to impersonate humans. They use perfect grammar, zero contractions, and phrases like "I hope this letter finds you in good health" when they're supposedly writing to their best friend. The examiner notices immediately. Band 7 letters, though? They sound like actual people wrote them.
The difference between Band 6 and Band 7 in Task 1 letter writing often comes down to tone authenticity. You can have the right structure, solid vocabulary, and correct grammar but still lose marks if your letter doesn't match the context. An informal letter to a friend needs to feel like a conversation on paper, not a formal document masquerading as casual.
This guide teaches you how to check your own letter tone, spot the subtle errors that keep you stuck at Band 6, and write informal letters that examiners actually believe are genuine. Whether you're using an IELTS writing checker or evaluating your work manually, these principles apply.
Informal doesn't mean sloppy. Let me be blunt: a Band 7 informal letter is still written in English, still grammatically sound, and still well-organized. The difference is that it uses casual language, personal voice, and real conversational patterns without breaking the rules.
The IELTS band descriptors for writing task 1 focus on Task Response, which includes whether you've adopted the right register for the context. For an informal letter, this means:
The examiner is asking: "Would a native speaker actually write this to a friend or family member?" If the answer is no, you're losing marks on Task Response and register consistency.
Let's look at how tone separates good letters from strong ones. Same prompt, different tone approaches.
Prompt: Write a letter to a friend you haven't seen in years. Tell them what you've been doing and suggest meeting up.
Weak (Band 5-6): "I am writing to inform you that I have been engaged in numerous activities since our last meeting. My professional responsibilities have been demanding, and I have pursued educational opportunities. I would like to suggest that we arrange a meeting in the near future to reconnect and exchange information regarding our respective experiences."
Why this fails: Sounds like a business proposal. Zero contractions. "I am writing to inform you" is stiff. "Exchange information regarding our respective experiences" is awkward formality. No personality.
Strong (Band 7): "It's been forever since we caught up! I've been pretty busy with work, honestly, but I'm finally getting some breathing room. Work's been intense, and I've also started taking some online courses, which is eating up my free time. Anyway, I'd love to see you soon. How about we grab coffee next month? I want to hear what you've been up to."
Why this works: Contractions throughout. "It's been forever" and "pretty busy" sound conversational. "Honestly" and "Anyway" are real discourse markers. Questions feel genuine. The writer is actually engaged, not just delivering information.
Prompt: Write to your neighbor about a party you're throwing and invite them.
Weak: "I am delighted to extend an invitation to you for a celebration event scheduled for the forthcoming weekend. The gathering will comprise musical entertainment and various refreshments. Your attendance would be most appreciated. I await your response with great anticipation."
This reads like a formal invitation card, not a casual note to a neighbor. "Most appreciated"? "Forthcoming"? A neighbor would never write this.
Strong: "Hi! We're throwing a little party this Saturday and we'd really like you to come. Nothing too fancy, just some food, drinks, and music. Should kick off around 7. Let me know if you can make it, and feel free to bring someone along!"
Natural. Short sentences mixed with longer ones. Actual invitation tone. Shows personality.
Stop guessing whether your tone is right. Use this checklist after you write:
Tip: Print your letter and mark every contraction you find. If the page looks sparse, you need more. Aim for one contraction every 25-30 words in an informal letter. An IELTS writing checker will flag this automatically, but doing it manually strengthens your instincts.
You're not failing because of grammar. You're failing because examiners catch these tone slips instantly.
Mistake 1: Mixing formal and informal randomly. You write casual for two sentences, then slip into business-speak, then back to casual. Pick one and stick with it. If it's informal, everything stays informal. Don't use "furthermore" in an informal letter to a friend.
Mistake 2: Being too formal because you're nervous about grammar. This is fear disguising itself as caution. You think: "If I use complicated words and perfect structure, the examiner will think I'm smart." Wrong. The examiner thinks you didn't read the prompt. If it says informal, informal it is. Grammatical accuracy at Band 7 includes writing correctly for the context, not just writing correctly.
Mistake 3: Overusing slang or abbreviations. You can use "lol", "btw", or "gonna" sparingly in very casual contexts, but a Band 7 letter finds the middle ground. You're aiming for conversational English, not text-message English. "I'm gonna see you soon" works. "U r the best" does not.
You don't need an expert to spot tone problems. Here's the process:
Step 1: Identify the relationship. Who are you writing to? A close friend, a coworker you know casually, a relative, a neighbor? Write it at the top of your draft.
Step 2: Read the prompt carefully. Does it say "friend", "family member", "person you know", "colleague you know well"? The descriptor matters. "A person you used to study with" is less familiar than "your best friend."
Step 3: Find three sentences in your letter. Read them out loud as if you're actually saying them to that person in real life. Would you say it? If yes, keep it. If it feels stiff or weird, rewrite it.
Step 4: Count contractions and mark them. Fewer than 2 in a 150-word letter? Too formal.
Step 5: Check the opening line. Is it a real greeting that acknowledges the relationship? Or a generic "I am writing"? Rewrite generic openings to create strong letter openings that establish your tone immediately.
Step 6: Cross-check for formal markers. Search your letter for these words: "furthermore, moreover, nevertheless, notwithstanding, in conclusion, with reference to, as per, it is with regret." If any appear, delete them immediately. They're red flags for wrong register in an informal letter.
Tip: Create a personal "forbidden word list" for informal letters and paste it next to your workspace while you draft. This prevents autopilot formality when you're under time pressure.
Let's see a complete Band 7 response so you understand the whole picture.
Prompt: Write a letter to an old school friend. You've recently started a new job. Tell them about it and ask about their life.
Example:
Hi Sara,
It's been ages! I hope you're doing well. I'm writing because I've got some news. I finally landed that job I mentioned last time we talked. It's with a tech company downtown, and honestly, I'm still getting used to it all.
The work's interesting but pretty intense. My boss is lovely, though, and the team's been supportive. The commute's a killer some days, but I'm adjusting. I'm mainly working on project management, which is different from what I expected but I'm enjoying the challenge.
Anyway, enough about me! What about you? You mentioned wanting to travel last year. Have you managed to plan anything? And are you still at the same company, or have things changed? I'd love to catch up properly soon. We should grab coffee or dinner next month if you're free.
Looking forward to hearing from you!
All the best,
James
Why this scores Band 7 for tone: Uses contractions naturally (I'm, It's, that's). Opens with genuine warmth ("It's been ages"). Mixes sentence lengths. Includes real questions showing genuine interest. Says "Anyway" and "Enough about me" as actual discourse markers. Closes appropriately without being stiff. Feels like a real person wrote it. An IELTS letter tone checker would flag this as authentic register use.
Here's what I see students doing wrong, mapped to what they should do instead:
Each "fix" maintains grammatical correctness while sounding like a real person wrote it. This is exactly what an IELTS task 1 letter correction should address.
If you're using an IELTS writing checker to evaluate your informal letter tone, here's what quality tools flag:
Basic spell-checkers won't catch tone issues. You need a tool that understands register and context. That's the difference between a tool that checks grammar and one that checks actual IELTS band descriptors. When you're ready to check your essay, our free IELTS writing checker evaluates tone consistency alongside vocabulary, grammar, and band score prediction. It's designed specifically for Task 1 letters, so you get targeted feedback on register matching instead of generic suggestions.
One moment you're writing casually, the next you slip into formal mode. It happens faster than you'd think, especially under exam pressure. A single sentence in the wrong register doesn't tank your score, but multiple shifts signal to the examiner that you're either unsure of the context or struggling with consistency.
For instance, you might write: "I'm really busy with work these days. I have been endeavoring to maintain a balanced lifestyle while managing professional obligations." See the shift? The first sentence is conversational; the second is stiff and formal. Your brain reached for "big words" mid-letter without noticing.
This is why reading aloud works. Your ear catches what your eyes miss. If you stumble over a phrase while reading it naturally, the examiner will too. Rewrite that moment in whatever voice flows without effort.
Contractions are the single easiest way to shift from Band 6 to Band 7 in informal letters. Not because the examiner is counting them (they're not), but because they make your writing sound human.
Here's the thing: native speakers contract. They don't avoid it in casual letters. You're not "I am happy" in a text to your friend. You're "I'm so happy." You don't say "You will not believe what happened." You say "You won't believe it."
A Band 6 letter might have 0-1 contractions in 180 words. A Band 7 letter has 4-6. That's not a rule the examiner checks with a clipboard. It's a symptom. It means you're writing like an actual English speaker instead of translating from a textbook.
Common contractions to use naturally:
Use these where they feel natural. Don't force them into every sentence. A letter stuffed with unnatural contractions reads as forced, which is worse than formal.
The closing is where many students accidentally sabotage themselves. They write an entire informal letter, then end with "Yours faithfully" or "Respectfully." The examiner thinks: "This person just spent 150 words sounding casual, and now they're signing off like a lawyer."
Your closing should match your opening and the entire tone of the letter. For informal letters to friends or family, these work:
For neighbors or people you know casually but aren't close with, these sit in the middle:
Never use "Yours faithfully" or "Yours truly" for informal letters. These are formal closings. Similarly, skip "With deepest gratitude" or "Respectfully" unless you're writing a formal letter, which falls under IELTS writing task 1 formal letter correction, not this guide.
Informal letters are personal by definition. The examiner expects you to include details about your life, feelings, or opinions. This isn't optional. It's part of the task response.
Don't write: "It would be beneficial to meet and discuss various topics." Write: "I've missed chatting with you. Let's grab coffee and catch up properly."
The second version includes genuine feeling. You're not just proposing a meeting. You're expressing that you've actually missed this person and want to reconnect. That's authentic tone.
When the prompt asks you to tell a friend about something, add your actual reaction to it. If you got a new job, don't just state that fact. Say whether you're nervous, excited, exhausted, proud. That transforms basic information into a real letter.
You now know what separates Band 6 from Band 7 in tone. You know the checklist. You know the common mistakes. The last piece is execution.
Write your next practice letter, then run through the checklist. Count contractions. Read it aloud. Mark any formal phrases. Rewrite the stiff bits. Then, if you want instant feedback on whether your tone actually lands at Band 7, use our IELTS writing checker to validate your work on task 1 letter correction and register consistency.
The difference between guessing and knowing is the difference between Band 6 and Band 7.
Get instant feedback on your letter tone, register consistency, and band score prediction. See exactly where your informal letters land and what to fix.
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