Here's what most students get wrong about IELTS Task 1 letters: they write the same tone for every letter. A formal letter to a university gets the same bland vocabulary as a complaint to your landlord. A friendly note to an old colleague sounds just as robotic and stiff as a request to a government office.
This is where tone kills your band score. IELTS examiners aren't just marking what you say. They're marking whether you've said it the right way. A Band 7 writer doesn't just communicate. They communicate appropriately for the context. That's the difference between Band 6 and Band 7, and it's what you're going to master today.
The band descriptors for IELTS Writing Task 1 include a specific criterion: Task Response. Within that, examiners assess whether you've adopted an appropriate tone. This isn't vague. It's measurable.
Band 7 requires you to "write in an appropriate register and tone." Band 6 says you might use "mostly appropriate register and tone"—which means you're slipping. Band 5? Your tone is all over the place. You see the gap immediately.
The problem is that "appropriate tone" feels abstract until you see it side by side with what doesn't work. Let's fix that.
A formal letter to a company, council, or organization demands distance. Not coldness, but respect. You haven't met this person. You're not friends. Your tone should reflect that professional gap.
Weak (Too casual): "Hey, I'm writing because the apartment is basically falling apart. You've gotta fix the window soon because it's driving me crazy."
Good (Appropriately formal): "I am writing to bring an urgent matter to your attention. The window in the living room has sustained significant damage and requires immediate repair."
The difference is stark. The second version uses passive constructions ("has sustained"), formal vocabulary ("bring to your attention"), and cuts the personal complaint language ("driving me crazy"). Band 7 writers know that formality isn't about sounding intelligent. It's about sounding professional.
In formal letters, you need at least three tone markers:
Quick test: Read your formal letter aloud. If you'd never say it in a face-to-face conversation with a stranger, you're hitting the right formality level.
Semi-formal letters are the Band 6 trap. You're writing to someone with slight authority or distance, but there's also familiarity. A teacher. A course coordinator. Your manager. This requires balance, and balance is hard.
Weak (Too robotic): "I hereby request that you grant me permission to submit my assignment beyond the stipulated deadline due to unforeseen circumstances."
Good (Balanced): "I would like to request an extension for my assignment submission. Due to unexpected circumstances, I would greatly appreciate your understanding."
The good version sounds respectful without being absurd. It uses "I would like" (courteous, not groveling), "greatly appreciate" (more formal than "thanks"), and a clear explanation. No contractions. No slang. But also no "hereby" or "stipulated deadline" nonsense that sounds like you're reading from a legal document.
Semi-formal means professional but personable. You respect hierarchy without abandoning natural English. This is exactly what examiners want to see.
Informal letters trip up a different group. Band 7 informal is NOT the same as how you text your friends. You're writing to someone you know—maybe a friend or family member—but you're still writing a letter. That matters.
Weak (Too sloppy): "OMG you won't believe what happened at uni lol. Literally everyone was so confused and it was actually hilarious. Srsly, you gotta come visit soon cos it's mental here."
Good (Appropriately informal): "You won't believe what happened at university last week. Everyone was completely confused, and it turned out to be quite amusing. You really must come visit soon; things have been quite hectic here."
The good version keeps the friendly tone (contractions like "won't," conversational phrasing) but dumps the text-speak and maintains grammatical structure. This is Band 7 informal: warm and natural, not chaotic.
Most Band 6 students swing too far one way or the other. They either sound like they're writing to a government official when the task asks for a friend, or they write like they're texting. You need the middle ground: friendly vocabulary and contractions, but proper sentences and no abbreviations.
Examiners aren't counting your friendly phrases. They're noticing patterns in 90 seconds. Here's what they actually look for:
Two-sentence test: Read only your first sentence and last sentence aloud. Do they sound like they're from the same letter? If not, your tone is inconsistent.
You don't need to guess if your tone is right. Build a simple internal checklist. Read through your letter and ask yourself these questions:
This takes 60 seconds. Sixty seconds between Band 6 and Band 7 is often just tone consistency.
If you're also checking your letter's structure and formatting, our guide on letter formatting walks you through the other elements examiners assess. You can also use our free IELTS writing checker to evaluate your tone alongside grammar and vocabulary.
Let's look at an actual IELTS Task 1 prompt: "Write a letter to a local government office about a public library you'd like to see built in your area. Explain why it's needed and suggest how it might be funded."
This is semi-formal. You're addressing a public official you don't know, but you're not groveling. Here's how tone works in practice:
Band 7 opening: "I am writing to propose the development of a public library in our area. This facility would address a significant gap in our community's resources and would benefit residents of all ages."
This is formal enough (no contractions, "I am writing," objective language) but not stiff. There's no "hereby" or passive voice overload. The tone shows respect for the recipient's authority without sounding desperate. It establishes credibility on line one.
Now compare to a Band 6 attempt:
Band 6 opening: "Hi, I'm writing because I really think we need a library in our area. Honestly, it would be so cool and helpful for lots of people."
Too casual. "Hi" doesn't belong here. Contractions in the wrong places. "So cool" is conversational, not persuasive. Examiners see this and think: this writer doesn't understand the social context. The tone doesn't match the task. That's a Band 6 ceiling right there.
Here's something crucial that separates Band 6 from Band 7: poor tone often masks grammar errors, and vice versa.
A sentence like "I would be most grateful if you could consider my request" sounds formal and polite. But if you write "I would be grateful if you could have considered my request," the grammar collapses. The formal politeness disappears because the structure is wrong. Examiners notice both problems at once.
Band 7 writers know that tone and grammar are linked. Formal tone demands careful conditional structures, passive voice, and complex sentences. You can't slap "Dear Sir" on sloppy grammar and hope it works.
If your tone feels weak, check these patterns first:
Pro tip: Formal tone mistakes are often grammar mistakes in disguise. If your letter sounds off, check your modals (would, could, should) and passive voice first.
Use these checklists every time. Most students who hit Band 7 aren't geniuses. They're systematic. They check the same things over and over until it becomes automatic.
The prompt always tells you the tone you need. If it says "a government office," "a company," or "an organization you don't know," it's formal. If it says "a teacher," "a manager," or "a course coordinator," it's semi-formal. If it says "a friend," "a relative," or someone you know well, it's informal. Look at the relationship first, and the tone becomes clear.
Our IELTS writing checker analyzes your letter's tone, grammar, and vocabulary in seconds. Get a band score estimate and specific feedback on letter appropriateness and tone evaluation.
Check My Letter Free