Here's what examiners see constantly: students who can organize a letter, choose the right tone, and hit the word count, but who lose marks because their punctuation is sloppy. And here's the thing—punctuation isn't decoration. It's grammar. It directly counts toward your Grammatical Range & Accuracy band score, which means it directly affects your overall writing band.
The IELTS band descriptors don't say "use punctuation correctly sometimes." Band 7 requires you to use a range of punctuation accurately, with only occasional errors that don't confuse the reader. Band 6 is where students get stuck—they nail the content but fumble the mechanics. You're probably closer to Band 7 than you think. You just need to know exactly what examiners are looking for and which traps to avoid.
This guide walks you through the specific punctuation rules that separate Band 7 from Band 6, with real examples from actual IELTS prompts. Whether you're using a manual checklist or an IELTS writing checker, understanding these rules first will make you a faster, more confident editor.
Let's be direct: you can write a perfectly coherent letter. Your ideas flow. Your register is spot on. But if your examiner reads run-on sentences and misplaced commas, they'll mark you down on Grammatical Range & Accuracy. That's one of four sub-scores in the writing assessment.
Here's what actually moves the needle: Writing Task 1 counts as 33% of your overall writing band. Within that, Grammatical Range & Accuracy is one of four equally weighted criteria. So if you're losing 0.5 points on punctuation—comma splices, missing apostrophes—you're directly hurting your Task 1 score.
The IELTS Writing Band Descriptors are explicit: Band 7 uses "a range of punctuation devices accurately." Band 6 shows "some errors in punctuation." That gap isn't small. That's the difference between a solid score and a strong one.
A comma splice happens when you join two complete sentences with only a comma. It's one of the most common formal letter punctuation errors, showing up in roughly 40% of Band 6 essays. The good news: once you spot the pattern, it's the easiest fix.
Weak: I am writing to request information about the course, I would like to know the start date.
Why doesn't it work? "I am writing to request information about the course" is a complete sentence. "I would like to know the start date" is also complete. You can't glue two complete sentences together with just a comma.
Here are three ways to fix it.
Good: I am writing to request information about the course, and I would like to know the start date.
That conjunction (and, but, or, nor, for, yet, so) is your safety net. Add one after your comma, and you've fixed the splice. This is the easiest pattern to remember and the safest for formal letters. Learning to spot and fix task 1 comma splice errors is often the single biggest punctuation improvement you can make.
Apostrophes trip up even strong writers. In formal Task 1 letters, you need to nail this.
Possessives show who owns something. For singular nouns, use an apostrophe plus 's'.
Good: I have received the university's application form.
Weak: I have received the universities application form.
Contractions squeeze two words into one. They're fine in semi-formal letters (don't, can't, won't), but use them sparingly in highly formal requests. When you do use them, the apostrophe replaces the missing letters.
Good: I can't attend the meeting on Friday.
Weak: I cant attend the meeting on Friday.
Tip: For highly formal complaint or inquiry letters, skip contractions altogether. Write "I cannot" instead of "I can't," and "I would" instead of "I'd." This keeps your register consistently formal and gives you fewer apostrophes to worry about.
This is where you actually separate yourself from the crowd. Most Band 6 writers stick to periods and commas. Band 7 writers use semicolons and colons strategically and correctly.
A semicolon connects two related independent clauses.
Good: I am writing regarding your advertisement; I am very interested in applying for the position.
Notice the semicolon shows that the second clause builds on the first without needing a conjunction. It's slightly more sophisticated than a period, and it fits naturally into formal letters.
A colon introduces a list, an explanation, or what comes next.
Good: I would appreciate information about the following: course content, fees, and accommodation options.
Weak: I would appreciate information about the following, course content, fees, and accommodation options.
Using colons correctly signals you understand formal writing conventions. Examiners notice this. Your Grammatical Range & Accuracy score improves.
You'll rarely quote directly in a formal letter. But when you reference something someone said or wrote, punctuation matters.
Good: In your email, you mentioned that "the course begins in September," which is helpful to know.
When you use direct quotation marks, the punctuation inside stays inside the marks, and your sentence punctuation follows outside.
But here's the smarter move for formal letters: use reported speech without quotation marks.
Good: You mentioned that the course begins in September, which is helpful to know.
No quotation marks needed. Your sentence flows naturally, your punctuation stays clean, and you sound more formal. This is the safer choice for Task 1.
Task 1 letters follow predictable structures. Master the punctuation for these patterns, and you'll write cleaner drafts every time.
Opening line after the salutation.
Good: Dear Sir or Madam, I am writing to apply for the position of marketing coordinator, which I saw advertised on your website.
That comma after "Madam" is required in British English (which IELTS uses). The rest is one sentence with a subordinate clause built in.
Listing your reasons or points.
Good: I would like to request the following information: your fees, payment options, and scholarship availability. Furthermore, I would appreciate details about accommodation on campus.
The colon introduces the list (fees, payment options, scholarship availability), and commas separate each item. The second sentence uses a period to start fresh.
Closing statement before your sign-off.
Good: I look forward to hearing from you soon. Yours faithfully, [Your name]
That period before the closing phrase is essential. No comma there.
Task 1 letters include practical details. Here's how to punctuate them correctly.
Dates. British English (IELTS standard) uses this format: 24 July 2026. No commas inside the date.
Good: 24 July 2026
Weak: July 24, 2026 or 24, July, 2026
Addresses. If you're writing the recipient's address at the top, each line stands alone without internal punctuation.
Good:
The Manager
Riverside Language School
45 Oak Street
Cambridge CB1 2QP
United Kingdom
References to titles or events. Capitalize them but skip quotation marks in formal business letters.
Good: I saw your vacancy for the Senior Marketing Coordinator position on your website.
Run through this in 60 seconds before you finalize your letter.
Tip: Read your letter aloud. Punctuation errors usually sound wrong when you hear them. If you stumble or pause awkwardly, you've probably hit a comma splice or misplaced period.
For a faster check, use our free IELTS writing checker to catch these errors instantly. It flags comma splices, missing apostrophes, and semicolon mistakes before you submit.
Beyond punctuation, make sure your letter stays consistent in tone throughout. Our guide on formal letter tone shifts shows you how examiners spot register inconsistencies that cost you points even when punctuation is clean. Also worth checking: request politeness in formal letters. The way you phrase your requests affects tone, which then affects punctuation choices.
These mistakes show up constantly in Band 6 essays. Fix them, and you're closer to Band 7.
Missing comma after "Dear Sir or Madam." This is a formal letter rule. The comma is required in British English.
Apostrophe in plurals. "The university's offer" (possessive) is correct. "The universities' offer" is correct only if multiple universities own it together. "The universitys offer" is always wrong.
Semicolon joining an independent clause to a dependent clause. A semicolon only works between two independent clauses. "I am writing to request information; which you can find online" is wrong because "which you can find online" is dependent. Use a comma instead: "I am writing to request information, which you can find online."
Comma before "which" clauses but not before "that" clauses. "I received the letter, which arrived yesterday" (comma needed). "I received the letter that arrived yesterday" (no comma). This matters for formal letter punctuation rules scoring.
Missing punctuation inside addresses. Each line of an address should not have internal punctuation unless you're running it inline (which you won't do in a formal letter).
You can use our free IELTS writing checker to catch punctuation errors instantly. It flags comma splices, missing apostrophes, and misplaced semicolons in real time. Upload your letter and you'll see exactly which formal letter punctuation errors are costing you band points.
If you're checking manually, prioritize the most common errors first. Comma splices appear in 40% of Band 6 essays. Apostrophe errors in possessives show up just as often. Fix those two categories, and you've solved most of your punctuation problems.
Once you've cleaned up punctuation, shift your focus to sentence length variation. Examiners notice when all your sentences are similar lengths, and that affects your Grammatical Range score alongside punctuation accuracy.
Our IELTS writing checker gives you instant feedback on punctuation, grammar, and your band score estimate. See exactly where you're losing marks.
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