Choosing between Their vs Thier can be confusing. However, only Their is the correct English spelling, while Thier is simply a common spelling mistake.
Many English learners and even native speakers accidentally type Thier instead of Their because the letters “i” and “e” are easy to reverse. However, Their is the only correct possessive determiner used in standard English grammar. It shows that something belongs to them, as in “Their house is beautiful” or “Their ideas inspired everyone.” On the other hand, Thier has no accepted meaning in modern English dictionaries and should always be corrected to Their. Understanding this simple spelling difference helps improve your writing, grammar, and overall communication skills. Learning the correct usage also prevents common mistakes in emails, academic writing, business documents, and everyday conversations.
Understanding the difference between Their vs Thier is essential for anyone who wants to write with confidence and accuracy. Since Their is one of the most frequently used English words, spelling it correctly leaves a better impression in both personal and professional communication. Whether you are writing a school assignment, blog post, social media caption, or work email, using Their instead of Thier improves clarity and credibility. In this guide, you’ll learn the correct spelling, simple grammar rules, practical examples, memory tips, and common mistakes to avoid. By the end, you’ll never confuse Their and Thier again, making your English more polished and error-free.
The Quick Answer: Their vs Thier
| Word | Correct? | Meaning |
| Their | Yes | Shows possession or ownership |
| Thier | No | Misspelling of “their” |
Correct Examples
- Their house is beautiful.
- Their children go to school nearby.
- The employees submitted their reports.
Incorrect Examples
- Thier house is beautiful.
- I borrowed thier book.
- The students forgot thier homework.
The answer is straightforward:
Use “their” whenever you want to show that something belongs to someone. Never use “thier.”
What Does “Their” Mean?
The word their is a possessive determiner in English grammar. It shows ownership or possession.
In simple terms, it tells you that something belongs to someone or something.
Examples
- Their car is parked outside.
- Their ideas changed the project.
- The dogs wagged their tails.
In each sentence, their tells us who owns something.
| Owner | Thing Owned |
| They | Car |
| They | Ideas |
| Dogs | Tails |
Think of their as a label that says:
“This belongs to them.”
Understanding Possessive Determiners
English has several possessive determiners.
| Pronoun | Possessive Determiner |
| I | My |
| You | Your |
| He | His |
| She | Her |
| We | Our |
| They | Their |
Examples:
- My phone
- Your computer
- Our house
- Their garden
The word their works exactly like my or your. The only difference is that it usually refers to more than one person.
Is “Thier” a Real Word?
No.
Thier is not an English word.
You won’t find it in a dictionary because it has no meaning in standard English.
It exists only because people accidentally switch the letters i and e.
Why Does It Look Correct?
The mistake happens because our brains often process words by looking at the first and last letters. When typing quickly, it’s easy to transpose two letters.
For example:
- recieve instead of receive
- freind instead of friend
- beleive instead of believe
- thier instead of their
These are all common spelling mistakes.
Why Do People Write “Thier” Instead of “Their”?
The error is surprisingly common.
There are several reasons.
The “I Before E” Rule
Many people remember this famous saying:
“I before E except after C.”
Unfortunately, English is full of exceptions.
Words like these break the rule:
- weird
- their
- foreign
- height
- leisure
Because of this inconsistency, people often spell their incorrectly.
Fast Typing
Modern communication happens quickly.
People send:
- emails
- text messages
- social media posts
- work documents
When typing fast, fingers sometimes hit letters in the wrong order.
The Brain Fills in the Gaps
Research in cognitive psychology suggests that readers can understand many words even when internal letters are mixed.
For example:
Aoccdrnig to rscheearch, you can raed tihs snetnece.
Because the human brain recognizes patterns, many people don’t notice they typed thier.
Pronunciation Doesn’t Help
Both words sound exactly the same.
You pronounce them as:
/ðer/
Since pronunciation offers no clue, writers must rely entirely on memory.
What Does “Their” Actually Do in a Sentence?
The word their usually appears before a noun.
Structure
Their + noun
Examples:
- Their dog
- Their car
- Their office
- Their children
You can also use it before adjectives and nouns.
Examples:
- Their new apartment
- Their expensive computer
- Their beautiful garden
Examples of “Their” in Everyday Writing
Family Examples
- Their parents live in Chicago.
- Their daughter won the competition.
- Their home overlooks the lake.
School Examples
- The students forgot their notebooks.
- The teachers graded their exams.
Business Examples
- The company changed their policies.
- The employees updated their schedules.
Sports Examples
- The players celebrated their victory.
- The team packed their equipment.
Singular Their: Can “Their” Refer to One Person?
Yes.
Modern English widely accepts singular their.
Examples
- Someone forgot their keys.
- Every student should submit their assignment.
- A customer can return their purchase within thirty days.
Years ago, many grammar books preferred:
Everyone should bring his or her notebook.
Today, this sounds awkward and repetitive.
Instead, most style guides recommend:
Everyone should bring their notebook.
Why Singular Their Matters
Singular their has become important because it:
- sounds natural
- avoids awkward wording
- supports gender-neutral writing
- reflects modern English usage
Major style guides accept singular their, including:
- The Associated Press Stylebook
- The Chicago Manual of Style
- Merriam-Webster
- Oxford English Dictionary
In fact, Merriam-Webster chose singular they as its Word of the Year in 2019 because of its growing importance in modern communication.
Read This Also: Outting vs Outing: Correct Spelling, Meaning?
Their vs There vs They’re
This is where many learners become confused.
These three words sound identical but have completely different meanings.
| Word | Meaning | Example |
| Their | Shows possession | Their car is new. |
| There | Refers to a place | The keys are over there. |
| They’re | Means “they are” | They’re going home. |
Their
Shows ownership.
Example:
Their house is beautiful.
There
Shows location.
Example:
Put the books over there.
They’re
A contraction of they are.
Example:
They’re planning a vacation.
Easy Trick to Remember the Difference
Replace the word in the sentence.
If you mean:
- Ownership → their
- Location → there
- They are → they’re
Examples:
Sentence: They’re coming tomorrow.
Can you replace it with “they are”?
Yes.
Therefore, they’re is correct.
Common Mistakes With Their and Thier
Mistake One: Using “Thier”
Thier dog is friendly.
Their dog is friendly.
Mistake Two: Using “There”
There house is beautiful.
Their house is beautiful.
Mistake Three: Using “They’re”
They’re house is beautiful.
Their house is beautiful.
Why Correct Spelling Matters
Some people think spelling mistakes are minor.
In reality, spelling affects how people judge your writing.
In School
Teachers often deduct marks for repeated spelling errors.
At Work
A professional email with spelling mistakes can appear careless.
In Business
Customers often trust companies that communicate clearly.
Online Writing
Articles with frequent errors may lose credibility.
Good spelling sends a message:
You pay attention to details.
Real-World Case Study: A Costly Typing Error
A marketing company once sent thousands of promotional emails containing the phrase:
“Visit thier website today.”
The mistake quickly spread on social media.
The company had to resend the campaign and issue a correction.
The lesson?
Even one small spelling mistake can affect professionalism and credibility.
Why “Their” Is One of the Most Misspelled Words
Several studies of typing behavior show that transposition errors are extremely common.
Examples include:
| Incorrect | Correct |
| Freind | Friend |
| Recieve | Receive |
| Thier | Their |
| Acheive | Achieve |
This happens because the human brain often processes words as complete units rather than individual letters.
Memory Tricks to Remember the Correct Spelling
Remember the Word “Heir”
The word their contains heir.
An heir inherits possessions.
Possessions involve ownership.
Ownership means:
Their.
This trick works surprisingly well.
Think About Belongings
Whenever something belongs to someone, ask yourself:
Whose is it?
If the answer is theirs, then the correct word is their.
Practice the Phrase
Repeat this sentence:
Their house is over there and they’re happy.
This famous sentence helps you remember all three words at once.
Examples of Correct Usage
Possession
- Their vacation starts next week.
- Their manager approved the project.
- Their children enjoy reading.
Organizations
- The company changed their pricing.
- The university announced their scholarship program.
Animals
- The birds built their nests.
- The cats cleaned their paws.
Examples of Incorrect Usage
Incorrect
- Thier car is broken.
- I borrowed thier laptop.
- Thier family moved away.
Correct
- Their car is broken.
- I borrowed their laptop.
- Their family moved away.
Their in Academic Writing
Academic writing often uses their as a singular pronoun.
Example:
A participant may withdraw their consent at any time.
This approach avoids awkward phrases like:
his or her consent.
Many universities now recommend gender-neutral language because it improves readability.
Their in Professional Communication
Business writing frequently uses singular their.
Examples:
- Every employee should update their password.
- Each customer must confirm their address.
This style sounds natural and inclusive.
Common Sentences Using Their
| Sentence | Correct? |
| Their dog is friendly. | |
| Their office opens at nine. | |
| I borrowed their pen. | |
| Thier office opens at nine. | |
| I borrowed thier pen. |
Practice Exercise
Choose the correct word.
Questions
- _____ house is on the corner.
- The students forgot _____ homework.
- _____ going to the concert tonight.
- Put the bags over _____.
- Somebody left _____ jacket.
Answers
- Their
- Their
- They’re
- There
- Their
Mini Quiz
Correct the sentence:
Thier dog is over there because they’re owner forgot it.
Answer:
Their dog is over there because their owner forgot it.
FAQs
1. Is “thier” ever the correct spelling?
No. Thier is always a misspelling. The correct word is their, which is a possessive pronoun used to show ownership or belonging.
2. What does “their” mean?
Their means something belongs to them. For example, “The students forgot their books.” It is commonly used in both spoken and written English.
3. Why do people confuse “their” and “thier”?
The mistake usually happens because the letters “i” and “e” are accidentally reversed while typing or writing. It’s one of the most common spelling errors in English.
4. How can I remember the correct spelling of “their”?
A simple trick is to remember that their follows the pattern “ei”, not “ie.” Reading your writing carefully or using a spell checker can also help catch the error.
5. Can using “thier” affect my writing?
Yes. Writing thier instead of their can make your work look less professional and may confuse readers. Using the correct English spelling improves clarity and credibility.
Conclusion
Understanding the difference between their vs thier is simple once you know that their is the only correct spelling. It is a possessive pronoun used to show ownership, while thier is merely a spelling mistake that should always be corrected. Learning this small distinction can greatly improve your grammar, writing accuracy, and overall communication.
Whether you’re writing an email, essay, blog post, or social media caption, using their correctly helps your writing appear polished and professional. By practicing the correct spelling and proofreading your work, you can easily avoid this common error and build stronger English writing skills over time.
