It's" vs "Its": The Apostrophe Rule and Email Fixes

Use it's only when you mean "it is" or "it has." Use its, with no apostrophe, for everything that belongs to or relates to a thing. Merriam-Webster states the rule this way: the apostrophe in it's shows that part of a word has been removed, and its is the possessive word, like "his" and "her," for nouns without gender.

1. Why the apostrophe causes trouble

With nouns, an apostrophe plus s usually shows possession: "the manager's approval," "the team's goal." So it feels natural to write "the company increased it's budget." Pronouns work differently. His, hers, ours, yours, theirs and its all show possession without an apostrophe.

The apostrophe in it's does a different job. It marks a missing letter, the same way it does in "can't" for "cannot" or "she's" for "she is." Merriam-Webster's examples: "it's raining" means "it is raining," and "it's been warm" means "it has been warm."

2. The two-second test

Before you send, replace the word with "it is" or "it has" and read the sentence aloud.

• If the sentence still makes sense, write it's.
• If it sounds wrong, write its.

"The company increased it is budget" fails, so the correct sentence is "The company increased its budget." And "It's been a busy quarter" becomes "It has been a busy quarter," which works, so the apostrophe is right.

3. Before and after, in work emails

Possessive written with an apostrophe

• Before: The vendor sent it's revised quote this morning.
• After: The vendor sent its revised quote this morning.

Contraction written without an apostrophe

• Before: Its not clear who owns this task.
• After: It's not clear who owns this task.

Mixed up in one sentence

• Before: The tool is useful, but it's main problem is that its slow.
• After: The tool is useful, but its main problem is that it's slow.

In the third example, "its main problem" is possessive (the main problem belongs to the tool), and "it's slow" is a contraction (it is slow). The test confirms both: "it is main problem" fails, "it is slow" works.

A sentence with both forms

• Before: Its a good plan, but it needs it's own budget line.
• After: It's a good plan, but it needs its own budget line.

4. Why the possessive it's looks so familiar

You are not imagining that it's used to look right. Merriam-Webster explains that when "its" first appeared in the early 1600s, it was written with an apostrophe as a possessive, as in "a house with it's own little garden." That form stayed extremely common through the 17th century and was used by writers such as Thomas Jefferson and Jane Austen. The version without an apostrophe only became dominant in the 18th century, probably because it's was taking on a new role, replacing the contraction 'tis.

That history does not make the old form acceptable now. Merriam-Webster's advice for current English is direct: use it's only when you mean "it is" or "it has," and drop the apostrophe everywhere else. The same page notes that the possessive it's still turns up in dashed-off emails and advertisements, which is exactly where readers will notice it.

5. Quick checks for proofreading

1. Search your draft for every "it's" and read each one as "it is" or "it has."
2. Search for every "its" and ask whether something belongs to or relates to a thing. If the sentence needs "it is" there, change it.
3. Check subject-verb gaps: "its" followed directly by an adjective (its important, its late) is almost always a missing apostrophe.
4. Check "it's" followed by a noun (it's budget, it's deadline) is almost always an extra apostrophe.

6. A shortcut for the other pronouns

If you are unsure, compare its with his and her, which Merriam-Webster names as the same kind of possessive word. You would never put an apostrophe in "his" or "her," so "it's budget" is wrong for the same reason. The dictionary entry for its defines it as an adjective meaning "of or relating to it or itself," with examples such as "the dog in its kennel" and "the company is hoping to increase its sales." As of October 2026, this is the distinction Merriam-Webster recommends following.

7. Key takeaways

• It's means "it is" or "it has." The apostrophe marks the missing letters.
• Its is the possessive form, like his and her, and never takes an apostrophe.
• Test by substituting "it is" or "it has" and reading the sentence aloud.
• "Its" before an adjective (its late) usually needs an apostrophe; "it's" before a noun (it's deadline) usually does not.
• The apostrophe possessive was common in the 1600s, but modern usage guidance says to avoid it.