IELTS Writing Task 1 Letter Punctuation Checker: Stop Making These Common Mistakes

Here's the thing: most students lose marks on IELTS Task 1 letters not because they can't write, but because their punctuation is sloppy. The IELTS band descriptors explicitly reward "correct use of punctuation," and a few careless commas or apostrophes can tank your score. This guide shows you exactly what examiners are looking for—and what makes them mark you down. If you want real-time feedback on these errors, our free IELTS writing checker flags punctuation mistakes instantly.

Why Punctuation Matters More Than You Think

You might think punctuation is a minor detail. It isn't. The Grammatical Range & Accuracy criterion covers punctuation directly. But here's the thing: bad punctuation doesn't just lower that one score. It also affects your Coherence & Cohesion band because readers (including examiners) have to work harder to follow your ideas.

Compare two Band 5 essays to one Band 7 essay and you'll see the difference immediately. The Band 7 writer uses punctuation consistently and correctly. The Band 5 writer doesn't. And examiners notice.

When an examiner sees misused punctuation, they read it one of two ways: either you don't know the rules, or you didn't bother to check your work. Either way, points come off. On a 9-point band scale, even one point dropped in Grammatical Range & Accuracy can lower your overall writing band.

Comma Splice in IELTS Letters: The #1 Punctuation Killer

A comma splice happens when you join two complete sentences with only a comma. In IELTS formal letter punctuation, it's the most common error. And it's a clear grammatical mistake.

See the problem? You have two complete sentences here: "I am writing to inquire about the course start date" and "it begins in September." A comma can't join them alone. That's a splice.

You have three real options: use a period, use a semicolon, or add a conjunction like "and" or "but" with the comma. Most Task 1 students go with the period. That's the safest choice, and there's nothing wrong with it.

Notice what changed: "I received your email last week" is now its own sentence. Then we start fresh with "I was busy with work," and add a comma before "so" because "so" connects the two parts of that new sentence. No splice.

IELTS Formal Letter Punctuation Errors: Apostrophes

Apostrophes are tiny characters, but misuse them and you look careless. Here are the two traps Task 1 students fall into most.

Trap 1: It's vs. its. "It's" is short for "it is." Period. "Its" is possessive (the cat lost its toy). In formal letters, you won't use "it's" often. But when you do, get it right.

Trap 2: Adding apostrophes to plurals. Don't. Just don't. This kills credibility faster than almost any other error.

The rule is simple: apostrophes show possession or contraction, never plurals. "The course's start date" (one course, possessive). "The courses' start dates" (multiple courses, possessive). "The courses" (just plural, no apostrophe).

Semicolons: Powerful When Used Right, Wrong When You Guess

Semicolons are powerful. They also intimidate students. Here's the core rule: use a semicolon to join two related independent clauses when you want them to feel connected.

The test? If you can replace the semicolon with a period and both parts still make sense as complete sentences, the semicolon works.

Both halves are complete sentences, they're related, and they feel connected. The semicolon fits. You could use a period instead (also correct). You could use a dash. You could even use "however" with a comma. All valid. The semicolon just makes the connection tighter.

This doesn't work because "with the booking process" isn't a complete sentence. It can't stand alone. So no semicolon.

In Task 1, use semicolons once or twice per letter maximum. If you're unsure whether a semicolon works, use a period instead. Examiners don't expect Task 1 to be semicolon-heavy. They expect it to be clear.

Exclamation Marks and Dashes: Keep Them Out

Exclamation marks have no place in formal Task 1 letters. Even if you're genuinely enthusiastic about the program or thrilled to apply, an exclamation mark sounds informal and childish in this context.

Same rule for dashes. Don't use them to break up your thoughts in a formal letter. Use commas, semicolons, or periods instead. Keep your punctuation traditional and professional. That's what the IELTS examiner expects.

Salutations and Closings: Pick a Style and Stick With It

This trips up more students than you'd think: the punctuation around your opening and closing. British English (the standard for IELTS) has two acceptable formats.

Format 1: Traditional British style (with punctuation)

Format 2: Open punctuation style (no punctuation)

Both are correct. Pick one. Use it consistently throughout your letter. Don't mix them—that makes you look careless.

How to Catch Your Own Errors Before Submission

You can't rely on spell-check or Grammarly to catch all punctuation errors. You need to train yourself. Here's a practical checklist to run through after you write your Task 1 letter.

1. Scan for comma splices: Read each sentence. If a comma joins two independent clauses, replace it with a period or semicolon.
2. Check every apostrophe: Look for "it's" and mentally expand it to "it is"—does that make sense? Check possessives: does the apostrophe go before or after the s?
3. Look for comma overload: If a sentence has three or more commas, reread it carefully. You might need to break it into two sentences.
4. Verify your opening and closing: Are your salutation and closing punctuated the same way? Are they consistent with the format you chose?
5. Count exclamation marks: If you have any in the body of your letter, replace them with periods.

Three Sentence Patterns You'll Use Over and Over

Rather than memorizing grammar rules, learn these patterns. They appear in almost every formal letter, and when you copy them, your punctuation will be correct automatically.

Pattern 1: Statement + reason

Pattern 2: Request + context

Pattern 3: Two related points

Use these templates. Once you see how punctuation works in real examples, you won't have to think about it. You'll just write correctly.

For more detail on how tone and formality affect your letter structure, check out our guide to common formal register errors in Task 1 letters. Getting the tone right is just as important as getting the punctuation right.

Beyond punctuation, your overall tone and formality matter just as much. Our complete guide to tone and register in Task 1 letters covers all the mistakes that can drag down your score.