Choosing between “on this matter” and “in this matter” can be confusing, especially because both phrases appear in formal and everyday English. While they may seem similar, they are used in different contexts and can change the tone and meaning of a sentence.
If you’ve ever wondered which phrase is correct, when to use each one, and how native speakers use them, this guide will help you understand the difference clearly. By the end, you’ll know exactly whether to write “on this matter” or “in this matter” in emails, conversations, legal documents, and professional writing.
Quick Answer
Both “on this matter” and “in this matter” are correct, but they are used differently:
- On this matter = about this topic, issue, or subject.
- In this matter = within this situation, case, or circumstance.
Examples:
✅ I would like to share my opinion on this matter.
✅ The court will make a decision in this matter next week.
In most everyday and business communication, “on this matter” is more common.
What Does “On This Matter” Mean?
The phrase “on this matter” means about a particular topic, issue, concern, or subject being discussed.
People often use it when:
- Giving an opinion
- Providing information
- Offering advice
- Discussing a topic
- Sharing feedback
Examples of “On This Matter”
- I have a few comments on this matter.
- She expressed her views on this matter during the meeting.
- Experts disagree on this matter.
- We need more research on this matter.
- The manager will speak on this matter tomorrow.
In these examples, the phrase simply means “about this issue.”
What Does “In This Matter” Mean?
The phrase “in this matter” refers to within a specific case, situation, affair, or circumstance.
It is commonly used in:
- Legal English
- Formal writing
- Official correspondence
- Administrative contexts
Examples of “In This Matter”
- The judge has issued a ruling in this matter.
- We are not directly involved in this matter.
- Her role in this matter remains unclear.
- The authorities are investigating everyone involved in this matter.
- No further action will be taken in this matter.
Here, the phrase refers to participation or involvement within a specific situation.
On This Matter vs In This Matter
The key difference is the focus of each phrase.
| Phrase | Meaning | Common Use |
| On this matter | About this topic or issue | Discussions, opinions, advice |
| In this matter | Within this case or situation | Legal, official, formal contexts |
| On this matter | Focuses on the subject being discussed | Meetings, reports, conversations |
| In this matter | Focuses on involvement or action within a situation | Court cases, investigations, procedures |
Side-by-Side Examples
On this matter
- I need your opinion on this matter.
- The professor wrote an article on this matter.
In this matter
- The company acted responsibly in this matter.
- The court has reached a verdict in this matter.
Which Phrase Is More Common?
In modern English, “on this matter” is generally more common because people frequently discuss topics, issues, and opinions.
You’ll often hear it in:
- Business meetings
- Workplace emails
- Academic discussions
- Everyday conversations
Examples:
- What are your thoughts on this matter?
- We need clarification on this matter.
- I agree with you on this matter.
Meanwhile, “in this matter” appears more often in formal and legal settings.
Examples:
- The attorney represents the client in this matter.
- The government has taken action in this matter.
Common Mistakes to Avoid
Many learners use these expressions interchangeably, but doing so can sound unnatural.
Mistake 1: Using “In This Matter” for Opinions
❌ I agree with you in this matter.
✅ I agree with you on this matter.
Because you’re discussing an opinion, on is the correct choice.
Mistake 2: Using “On This Matter” for Legal Cases
❌ The judge ruled on this matter yesterday.
⚠ While possible in some contexts, legal English usually prefers:
✅ The judge ruled in this matter yesterday.
Mistake 3: Confusing Topic with Involvement
❌ We were not involved on this matter.
✅ We were not involved in this matter.
The sentence refers to participation in a situation, so in is correct.
Easy Rule to Remember
A simple way to remember the difference:
- Use on when talking about something.
- Use in when talking within a situation or case.
Think of it this way:
On = About
In = Within
Examples:
- My opinion on this matter.
- My involvement in this matter.
Formal Email Examples
Using “On This Matter”
- Thank you for your comments on this matter.
- We appreciate your feedback on this matter.
- Please share your views on this matter at your earliest convenience.
Using “In This Matter”
- We are currently reviewing our position in this matter.
- The legal department is handling all communications in this matter.
- Further updates in this matter will be provided soon.
Academic and Professional Usage
In academic writing, “on this matter” is often preferred when discussing research, theories, or viewpoints.
Examples:
- Scholars remain divided on this matter.
- Several studies have been published on this matter.
In professional and corporate communication, both phrases appear depending on the context.
Examples:
- We need a final decision on this matter.
- The compliance team is investigating issues in this matter.
American vs British English
There is no major difference between American and British English regarding these phrases.
Both varieties use:
- On this matter for topics and opinions.
- In this matter for situations, cases, and formal proceedings.
American English Examples
- What’s your position on this matter?
- The company remains neutral in this matter.
British English Examples
- The committee has differing views on this matter.
- The court’s judgment in this matter is final.
The usage patterns remain largely the same across both forms of English.
Synonyms and Related Phrases
Depending on the context, you may also use:
Alternatives to “On This Matter”
- About this issue
- Regarding this topic
- Concerning this subject
- With respect to this matter
- About this question
Alternatives to “In This Matter”
- In this case
- In this situation
- In this circumstance
- Regarding this case
- Within this issue
Using these alternatives can help improve variety in writing.
FAQs
Is “on this matter” grammatically correct?
Yes. It is a correct and common phrase meaning about a particular topic or issue.
Is “in this matter” grammatically correct?
Yes. It is grammatically correct and usually refers to involvement within a specific situation, case, or circumstance.
Which is more common in everyday English?
“On this matter” is generally more common because people frequently discuss opinions and topics.
Can I use both phrases interchangeably?
Not always. Their meanings differ slightly, and choosing the wrong one may sound unnatural.
Which phrase is better in business emails?
Usually “on this matter” when discussing an issue or requesting feedback. Use “in this matter” when referring to involvement in a specific case or situation.
Is “in this matter” mainly legal English?
It is especially common in legal and official documents, but it can also appear in formal business communication.
How do I remember the difference?
Remember:
- On = About
- In = Within
This simple rule works in most situations.
Can native speakers use both phrases?
Yes, native speakers use both regularly, but they select the phrase based on the intended meaning and context.
Summary
Understanding the difference between “on this matter” and “in this matter” helps you communicate more naturally and professionally. While both phrases are correct, they serve different purposes.
“On this matter” refers to a topic, issue, or subject being discussed, whereas “in this matter” refers to participation, action, or circumstances within a specific case or situation.
In most conversations, emails, and discussions, “on this matter” is the phrase you’ll use more often. Reserve “in this matter” for formal, legal, administrative, or case-related contexts. Choosing the correct phrase makes your writing clearer, more precise, and more professional.
Actionable Takeaway
Before choosing between the two phrases, ask yourself a simple question: Am I talking about a topic or about involvement in a situation? If it’s a topic, use “on this matter.” If it’s a case, circumstance, or involvement, use “in this matter.” This quick check will help you use both expressions confidently every time.
Jase Tucker is a contributing author at SyntaxlyHub, dedicated to helping readers master English grammar with clarity and confidence. His writing focuses on practical rules, common mistakes, and clear examples that support accurate writing, stronger sentence construction, and effective communication in academic, professional, and everyday contexts.
