IELTS Letter Writing – Formal & Informal Tone

IELTS letter writing seems easy, but without a consistent tone, your Task Achievement score will be 6 or lower.

This lesson will ensure that your score can increase to a band 7 and higher.

Specifically, you’ll learn what tone is, how to use it and how to improve your own ability to use it accurately.

IELTS General letter writing requires you to know how to write in the appropriate tone.


What is Tone?

To have the appropriate tone for IELTS General letter writing, we must write in a formal or informal style.

The reason that tone is important is that it affects what people think about us.

We use formal language if we want people to think that we’re intelligent, respectful, serious, knowledgeable or dependable.

If we want people to think that we’re friendly, fun, relaxed or outgoing, we use informal language.

Tone affects the way that people perceive you.

So, for example, we normally use informal language with our friends, but if we need to discuss something serious, we will use formal language instead.

Similarly, we normally use formal language with our employer, but if we’re at a work party, we would use informal language.

To adjust the tone of the language, different vocabulary and grammar must be used.

You can also see how Cambridge describes formal and informal language here.

General Guidelines for the IELTS Letter Writing

Which Tone to Use for IELTS General Letter Writing

When the question says to write a letter to a friend, like the one below, we use an informal tone.

This is a typical General Training IELTS question that requires an informal tone.

When we’re writing a letter to anyone else, we use a formal tone.

For IELTS letter writing, there’s no need to worry about semi-formal language as formal and informal is enough to meet the examiner’s requirements.

Not Too Informal

When we are sending messages to our friends, we often use shortened versions of a word like ‘pls’ instead of ‘please’ or ‘OK’ instead of ‘okay’.

However, you don’t want to do this for IELTS letter writing. Remember, it’s still a test of your English, so you need to show what you’re capable of.

In an informal letter, IELTS requires you to use full English grammar structures.

Also, you should use complete grammatical structures.

Saying something like, “You going?” isn’t acceptable, and you need to use the full structure, “Are you going?”


Don’t use idioms in IELTS general letter writing as they will reduce your score.

Idioms are quite old fashioned and are rarely used in modern English.

Also, the circumstances in when they are appropriate are very rare, which means that even if you know what an idiom means, it will normally be inappropriate to use it.

Idioms are not suitable for IELTS letter writing Task 1.


Don’t use abbreviations like e.g. or etc.

Cohesive Devices for IELTS Letter Writing

As you’re likely aware, you need to use cohesive devices to get a high Coherence and Cohesion score in Task 1.

Cohesive devices tend not to be informal and are mostly formal or neutral.

The formal ones should only be used in formal letters, but the neutral ones are okay for both formal or informal letters.

Strangely, the tone of these words isn’t labelled in any of the most reliable dictionaries, so you can use the list below to help you determine which ones are suitable for your Task 1 answer.

The appropriate cohesive devices are essential for your Task Achievement and Coherence and Cohesion scores.

However, word lists are not a good way to learn new vocabulary so just use this list to help you learn about the tone of the cohesive devices you already know.

In General Training IELTS, you can use neutral cohesive devices in informal letters or any cohesive device in formal letters.

As you may have noticed from the above image, formal cohesive devices are often longer than neutral ones.

If you’d like a pdf download of the above cohesive devices, you’ll get these, as well as sample questions and answers, when you sign up for my newsletter.

Grammar for IELTS Letter Writing

In this part of the lesson, we are looking at how different grammatical structures can affect the tone of your writing.

However, if you don’t have a firm grasp of English grammar already, you should focus on that first.

As grammar in Task 1 is scored the same way as Task 2, my grammar lesson will show you how the examiner decides and how to improve your score.

The Length of the Structures

In general, longer grammar structures are more formal.

For example;

Formal: I am afraid that I won’t be able to attend your party.

Informal: I can’t go to your party.

One thing to be aware of the help you use the correct tone in IELTS letter writing Task 1 is that formal grammatical structures tend to be longer.

Being Direct

Also, informal structures tend to be more direct.

For example;

Formal: I think it would be a good idea if you started to do some regular exercise.

Informal: You should do more exercise.

Being indirect is considered to be more formal in IELTS General letter writing.

Keep in mind, though, that being direct can be rude if you’re giving advice or asking for help.


Contractions are considered to be less formal.

For example;

Formal: I am so sorry.

Informal: I’m so sorry.

This is something to keep in mind for your IELTS letter writing because we are making an effort to sound more formal or informal.

For Task 2, though, it’s acceptable to use contractions because modern English is less strict about this convention.


The use of modals is another way to sound more formal.

For example;

Formal: I would like to go home.

Informal: I want to go home.

Using modals is another aspect of being formal.

Phrasal Verbs

Phrasal verbs are often more informal.

For example;

Formal: He arrived late to the party.

Informal: He turned up late to the party.

Passive Voice

Passive voice isn’t always formal, but it can be used to make a sentence sound more formal.

For example;

Formal: The house was bought for $1 million.

Informal: Someone bought the house for $1 million.

Use passive voice in General Training IELTS to sound more formal.

Vocabulary for IELTS Letter Writing

Neutral Tone

Firstly, it’s important to note that most vocabulary is neutral rather than formal or informal.

Let’s first look at an example from the Cambridge Dictionary.

Here, we see three words that can be used to describe food with a nice flavour.

However, as you can see in the image, only the word ‘yummy’ is marked as being informal.

The other two don’t say anything about the tone, which means that they are neutral.

These neutral words are suitable to use in both formal and informal situations.

For your IELTS letter writing Task 1 answer, most language is suitable as most language is neutral.

Vocabulary You Already Know

Unfortunately, most students don’t check if new words are formal, neutral or informal when studying vocabulary.

This means that you could potentially know thousands of English words already but don’t know which ones to use for formal and informal letters.

The only option now is to go back and relearn this aspect of the vocabulary you already know.

Of course, you can search every word in a dictionary, but that’s impractical because of how much time it would take.

Relearning vocabulary you already know is a necessary part of improving your General Training IELTS score.

An English Speaking Friend

A better option is to do some IELTS General letter writing and then ask an English-speaking friend to check the tone for you.

Online Resources

  1. An alternative is to use a site like HiNative where people from all over the world help each other with language learning.

    With this option, however, you won’t be as confident that the feedback you get is reliable.

  2. If you’re willing to pay money, an app called Wordtune gives you suggestions on how to make your writing sound more formal or informal.

    This app won’t actually tell you which words are formal or informal, though; it just gives accurate suggestions on how to adjust the tone.

  3. As you’ll see in my Lexical Resource lesson, I’m against using word lists to learn new vocabulary.

    However, in this situation, they are a quick way to discover if words we already know are formal or informal.

    I have looked at all the most popular formal and informal vocabulary lists online and determined that these are the most reliable ones.

Free Live Feedback Lessons

You can also come to my free Live Feedback Lessons, where I will give you feedback on the tone of your writing.

Learning New Vocabulary

So how can you discover if any new vocabulary you learn is formal or informal?

In short, you need to check a dictionary and make a note of it in your vocabulary notebook.

For the full explanation, make sure you follow my Vocabulary Improvement Strategy.

However, you can also become better at recognising tone by noticing the intentions of the person speaking or writing.


The intention of the speaker or writer is a good indication of what tone is being used.

For example, a news reporter wants to convey that their information is reliable, so they use a formal tone.

To help you become more aware of tone for your IELTS General letter writing, pay attention to the intentions of writers and speakers in comparison to the tone they use.

Magazines like National Geographic or Time want to show that they are reputable sources of information so use formal language.

However, magazines like J14, which are aimed at teenagers, want to be seen as fun and trendy, so use informal language.

The tone of the language used in a movie or TV show will depend on the situation and the relationship between the speakers.

Noticing the intentions of a speaker or writer in this way is important for improving your ability to use the appropriate tone in IELTS letter writing.


Don’t read classic literature!

Most of these books were written a long time ago, and the English language has changed a lot since then.

For example, the novel “Frankenstein” was written in 1817 and in the very first sentence, you will see the word ‘distinguished’.

The types of language you will find in classic literature isn't suitable for IELTS letter writing.

However, the word ‘distinguished’ is not used as often anymore, as you can see in this image from Google Books.

As you can see, informal or formal letter IELTS need to use contemporary English.

Sample Answers for IELTS Letter Writing

What we’ve looked at so far is how to adjust the tone of our writing.

Now, let’s see what it actually looks like.

Below are two letters with the exact same information, but the first is for the writer’s boss and the second for the writer’s friend.

Formal Sample Answer

This is an example of a General Training IELTS question that requires a formal letter.

Dear Mrs Smith,

This Sunday, I am having a dinner party to mark my and my husband, John’s, 20th wedding anniversary. He is not aware that I am organising this party which means that it will be quite a big surprise for him. John immensely enjoys when we have guests, and because of this, I am quite confident that he will be very pleased when the guests arrive.

There will be cuisine from your country served as my husband is very fond of Nigerian dishes. Under normal circumstances, we don’t eat it very often, though, as it is quite challenging to get the right ingredients in this part of the world. Fortunately, however, I have been able to acquire all the necessary ingredients, and I am confident that John will enjoy the party all the more because of this.

I thought that it would be nice if you could come to the party as well since there will be some guests who I believe you would enjoy the company of. Dinner will be served at approximately 5 o’clock; however, it would be nice if you could come earlier and we can chat before the other guests arrive. Please let me know by Saturday if it is possible for you to attend because I would like to ensure that there is enough food for everyone.

Yours sincerely,

Jennifer O’Connell

Informal Sample Answer

IELTS letter writing questions like this require informal answers.

Dear Jane,

I’m throwing a dinner party on Sunday to celebrate 20 years of marriage with John. He doesn’t know that I am planning it, so that will be a big surprise for him. You know that he loves having visitors over to the house, so I’m pretty sure that he’ll be delighted when he sees all of the guests arriving.

We will have dishes from your country there because John is actually a massive fan of Nigerian food. We usually don’t eat it much because it’s just so tricky to get the right ingredients around here. Luckily, though, I was able to get everything I need already, and I know that this will make the party all the better for him.

I was hoping that you can come to the party too because there will be other people there that I think you will enjoy meeting. Dinner will be at about 5 o’clock but get here before that if you can, and we’ll hang out for a while before everyone else comes. Can you let me know by Saturday if you’ll be coming because I want to make sure that I cook enough food?

Best wishes,


What now?

I’m sure this lesson has highlighted a lot of things you need to focus on for your IELTS test and if you ever need to review it, you can use this video.

Embed your youtube videos in your own website blogs.

However, make sure you understand how the examiner assesses IELTS letter writing with my Task 1 band scores explanation and how to write a letter with my Step by Step Strategy. Finally, you can compare your writing with my sample letters.