🧠 “On This Matter” vs “In This Matter”: Know the Real Difference

Ever stumbled on a sentence and paused, wondering whether to say “on this matter” or “in this matter”? You’re not alone. These prepositional phrases might appear interchangeable, but they carry subtle differences in tone, focus, and context.

Here’s the kicker: The difference isn’t just grammatical—it’s also stylistic. In professional communication, especially legal and formal writing, the right preposition can shape how your message is received.

Let’s break this down clearly, so you’ll never second-guess yourself again.

“On this matter” implies an external opinion about an issue, while “in this matter” signals active involvement or responsibility within it.

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Exploring the Subtle Nuances of “On This Matter” and “In This Matter”

At first glance, these two phrases might seem synonymous. After all, both relate to a specific topic or issue. But dig a little deeper, and you’ll discover important distinctions.

Core Differences at a Glance

Phrase	Implied Focus	Common Usage Areas
On this matter	External viewpoint or opinion	Legal, formal letters, decisions
In this matter	Internal involvement or action taken	Legal cases, personal involvement

Think of it this way:

• “On this matter” = Speaking about the issue
• “In this matter” = Acting within the issue

Here’s an analogy: If an issue were a room, saying “on this matter” is like standing outside and commenting through the doorway. Saying “in this matter” means you’ve stepped inside and are part of what’s going on.

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The Grammatical Perspective: How Prepositions Influence Meaning

Prepositions like on and in are more than just small connecting words—they frame the relationship between ideas.

• “On” typically refers to topics, surfaces, or involvement at a high level.
• “In” implies physical or metaphorical inclusion, deeper involvement, or being within boundaries.

Here’s how they affect “this matter”:

• On this matter → a surface-level stance, opinion, or input
  Example: “I would like to offer my thoughts on this matter.”
• In this matter → involvement, participation, or responsibility
  Example: “He acted diligently in this matter.”

These nuances can impact tone, especially in professional writing. Using the wrong one might make your message feel detached or overly assertive.

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Definition of “On This Matter” with Contextual Examples

“On this matter” means “concerning this issue” or “regarding this topic.” It suggests you’re addressing or commenting on a specific subject.

When to Use:

• When offering a viewpoint or formal response
• When referencing a topic in letters, emails, or speeches

Examples:

• “The board has reached a final decision on this matter.”
• “I have no further comments on this matter at this time.”
• “Let me clarify my position on this matter.”

The phrase has a slightly more objective or analytical tone, often used by people not directly involved in the issue but addressing it from a professional or advisory perspective.

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Understanding “In This Matter” Through Illustrative Sentences

“In this matter” means “within the context of this issue” or “as part of this situation.” It suggests a role or engagement in handling or resolving the matter.

When to Use:

• When emphasizing participation, contribution, or responsibility
• Often appears in legal contexts or formal declarations

Examples:

• “We appreciate your cooperation in this matter.”
• “The lawyer represented her client well in this matter.”
• “He played a key role in this matter and deserves credit.”

It sounds more personal and embedded, suggesting direct involvement or responsibility.

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Usage and Variations in Different Contexts

Context matters a lot. Let’s look at some real-life situations where one phrase fits better than the other.

Professional Communication

• ✅ “We would like to state our official position on this matter.”
• 🚫 “We would like to state our official position in this matter.” (sounds off unless you’re involved in a decision-making process)

Legal Correspondence

• ✅ “The court requires further evidence in this matter.”
• ✅ “The judge delivered her ruling on this matter.”

Customer Service

• ✅ “Thank you for your patience in this matter.” (suggests the customer was involved in an ongoing issue)
• ✅ “We apologize for the delay in this matter.”
• ✅ “We hope to provide clarity on this matter.” (refers to the topic, not the action)

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Historical Usage Trends: “On This Matter” vs. “In This Matter”

Let’s take a brief look at how these phrases have evolved over time.

According to Google’s Ngram Viewer:

• “On this matter” has traditionally seen more frequent usage than “in this matter,” especially in government documents and public statements.
• “In this matter” is often used in legal and procedural writing, peaking in usage alongside the rise of formal litigation and contractual documentation in the 20th century.

Here’s a simplified breakdown:

Decade	Dominant Phrase	Typical Usage Scenario
1900s–1950s	On this matter	Formal speeches, letters
1960s–2000s	In this matter	Legal cases, contracts, investigations
2010–Today	Both in parallel	Style-dependent usage

As language modernizes, both phrases coexist, but with different shades of formality and involvement.

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Alternate Prepositions and Their Impacts on “This Matter”

While “on” and “in” are most common, there are a few alternate prepositions people use—sometimes correctly, sometimes not.

Other Prepositions Occasionally Used:

Preposition	Phrase	Correct?	Usage Tone/Meaning
About	About this matter	✅	Informal; neutral commentary
Concerning	Concerning this matter	✅	Formal; traditional style
Regarding	Regarding this matter	✅	Neutral and professional
With	With this matter	❌	Often incorrect or awkward
To	To this matter	❌	Misused; not grammatically correct

Tip: Stick with on, in, about, or regarding to maintain professionalism.

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❓ 6 FAQs

What is the difference between “on this matter” and “in this matter”?
“On this matter” refers to commenting about a topic, while “in this matter” implies direct involvement or participation.

Which is more formal: “on this matter” or “in this matter”?
Both are formal, but “on this matter” is often used in official positions, while “in this matter” appears in legal or participatory contexts.

Can I use “on this matter” in legal writing?
Yes, particularly when expressing judgments or positions. “In this matter” is better for describing legal involvement.

Is it wrong to say “with this matter”?
Generally, yes—it sounds awkward and is not standard in professional or formal English.

How do I know which preposition fits my sentence?
Use “on” for opinions or commentary; use “in” when discussing actions taken or roles played within the issue.

Are “regarding this matter” and “on this matter” the same?
They are close in meaning. “Regarding” is slightly more neutral and professional, while “on” can feel more assertive.

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Conclusion: Knowing the Right Preposition Makes All the Difference

So, what’s the takeaway?

• Use “on this matter” when you’re referring to a topic, expressing an opinion, or responding from an external point of view.
• Use “in this matter” when you’re describing involvement, participation, or responsibility.
• Know your context. Legal documents, customer service emails, formal letters—all benefit from choosing the right tone.

Mastering these subtle distinctions can sharpen your communication, especially in professional and academic settings. Language isn’t just about rules—it’s about resonance. And when your prepositions align with your purpose, your message lands exactly as intended.