The One Rule You Need
- It's (with apostrophe) = it is or it has. Always. No exceptions.
- Its (no apostrophe) = belonging to it. The possessive form. No exceptions.
The apostrophe in it's does not show possession. It marks a missing letter, just like in don't (do not) or they're (they are).
It's: The Contraction
It's contracts either it is or it has:
It's = It is
- It's raining outside. → It is raining outside.
- It's a difficult problem to solve. → It is a difficult problem.
- It's not what I expected. → It is not what I expected.
- It's been a long day. → It has been a long day.
It's = It has
- It's been three weeks since the update. → It has been three weeks.
- It's taken longer than planned. → It has taken longer than planned.
- It's never happened before. → It has never happened before.
Its: The Possessive
Its (no apostrophe) shows that something belongs to or is associated with the thing already mentioned. It is in the same family as his, her, our, and their — none of which use an apostrophe to show possession.
- The company released its annual report. (the report belonging to the company)
- The algorithm improved its accuracy over time.
- The project is behind schedule due to its complexity.
- The cat licked its paw.
- The software has its limitations.
The Foolproof Test
Whenever you write its or it's, expand the word to it is or it has and read the sentence. If it makes sense with the expansion, use the apostrophe (it's). If the sentence breaks down, use the possessive form (its).
| Sentence | Expand to "it is / it has" | Makes sense? | Use |
|---|---|---|---|
| ___ raining again. | "It is raining again." | Yes | It's |
| The team finished ___ work. | "The team finished it is work." | No | Its |
| ___ been a good year. | "It has been a good year." | Yes | It's |
| The software has ___ own learning curve. | "The software has it is own learning curve." | No | Its |
Why the Apostrophe Rule Feels Wrong
English uses apostrophes for two purposes: contractions (missing letters) and possession (Sarah's book, the dog's collar). With most nouns, you add 's to show possession: the company's report, the project's scope. So it feels logical that the possessive of it would be it's.
But English makes an exception for pronouns. None of the personal pronouns use an apostrophe to show possession: his, hers, ours, yours, theirs, its. No apostrophes, even though they all express ownership. This exception exists because the apostrophe in pronouns was already being used for contractions, which creates ambiguity. To resolve it, possessive pronouns simply drop the apostrophe.
The confusion is natural and understandable — but the rule itself is absolute. Its for possession, it's for "it is" or "it has."
Common Sentences with Errors and Corrections
| Incorrect | Correct |
|---|---|
| The organization published it's findings. | The organization published its findings. |
| Its been a long week. | It's been a long week. |
| The product is known for it's durability. | The product is known for its durability. |
| It's performance exceeded expectations. | Its performance exceeded expectations. |
| The app has improved it's interface. | The app has improved its interface. |
Its and It's in Professional Writing
In business documents, press releases, and academic papers, its/it's errors are particularly noticeable because readers expect polished proofreading. A misplaced apostrophe in a formal document signals that the writer did not review the final draft carefully.
Because spell checkers will not flag this error (both words are spelled correctly), a deliberate proofread specifically targeting its and it's is necessary. Read each instance, apply the expansion test, and confirm before publishing or submitting.
See the complete guide on how to edit and proofread for a full proofreading checklist that includes homophone errors like this one.
Related Possessive Pronouns: No Apostrophes
The its/it's rule is part of a broader pattern. None of the possessive pronouns use apostrophes:
| Possessive Pronoun | Common Error |
|---|---|
| its | it's (used as possessive) |
| yours | your's (does not exist) |
| hers | her's (does not exist) |
| theirs | their's (does not exist) |
| ours | our's (does not exist) |
| whose | who's (contraction of "who is") |
None of those apostrophe forms are correct for possession. Your's, her's, their's, and our's do not exist in standard English. Understanding this broader pattern reinforces why its (possessive) has no apostrophe.
Frequently Asked Questions
Is there ever a case where "its'" (with apostrophe after the s) is correct?
No. Its' is never correct in standard English. The possessive of it is always its. The form its' does not exist. Some writers produce it by analogy with plural possessives like the dogs' leashes, but that rule applies to nouns, not pronouns.
Why don't possessive pronouns need apostrophes?
Possessive pronouns evolved as a distinct set of forms specifically to show ownership, so they do not need an added apostrophe-s to signal possession the way nouns do. The forms his, hers, its, ours, yours, theirs, whose already carry the possessive meaning without additional punctuation.
How can I remember this quickly while writing?
The single fastest check: try substituting "it is." If the sentence works, write it's. If not, write its. You can do this in one second and it is never wrong.
Does this rule apply to other pronouns too?
Yes. The same principle applies: whose (possessive) vs. who's (who is). Your (possessive) vs. you're (you are). Their (possessive) vs. they're (they are). In every case, the form with an apostrophe is the contraction, and the form without is the possessive. For more on those pairs, see their vs. there vs. they're.