Its is possessive: “The lantern lost its handle.” It’s is a contraction of it is or it has: “It’s bright” means “It is bright,” and “It’s been repaired” means “It has been repaired.” If you are unsure, expand it’s and see whether the sentence still works. [1]
Why the apostrophe points the wrong way
Many possessives take an apostrophe, but possessive pronouns do not. Its belongs to the same group as his, hers, ours, and yours: the form already marks possession without punctuation. It’s follows a different pattern because the apostrophe marks missing letters in a contraction. Purdue OWL distinguishes its as possessive from it’s as a contraction for it is or it has. [1]
That makes the two forms sound alike but perform different jobs. In “The microphone lost its charge,” its tells us which charge. In “It’s losing charge,” it’s expands to “it is.” The apostrophe does not indicate ownership in the first phrase, just as his does not need one in “his microphone.”
Expand the contraction
Use a simple editing test: replace it’s with it is, then with it has if the verb phrase allows it. “It’s a quiet room” becomes “It is a quiet room,” so the contraction is correct. “It’s recorded the first take” becomes “It has recorded the first take,” so it’s can also be correct there.
Now test “The room changed it’s acoustics.” Expanding gives “The room changed it is acoustics,” which does not work. The sentence needs the possessive its: “The room changed its acoustics.” The test is fast because it checks what the sentence means, not just what the word looks like.
Try it in a short editing exercise
Imagine a note about a community theater: “The stage has it’s own echo. It’s been fitted with curtains, and the crew adjusted it’s sound.” First expand each contraction. “The stage has it is own echo” fails, so write “its own echo.” “It has been fitted with curtains” works, so keep “It’s been fitted.” “The crew adjusted it is sound” fails, so use “its sound.”
The corrected note reads: “The stage has its own echo. It’s been fitted with curtains, and the crew adjusted its sound.” Read it once more for meaning: the stage has an echo of its own, somebody has fitted curtains, and the crew adjusted the sound associated with the stage. If the referent of it is unclear, name the stage again.
Do not let the shortcut override meaning
The expansion test catches most errors, but it does not decide whether a sentence is clear or accurate. In “It’s changed its tone,” the first form means “it has changed” and the second marks the tone belonging to it. Both are correct, yet a reader may need context to know what it refers to. A clearer version might name the source: “The announcement has changed its tone.”
Also remember that it’s can expand to it has only when the following words form a valid verb phrase. “It’s finished” may mean “it is finished” or, in a different context, “it has finished.” The surrounding sentence supplies the intended reading. When both expansions seem possible, keep the contraction only if the meaning is unmistakable.
Make proofreading targeted
When editing a draft, search mentally for every instance of its and it’s rather than waiting for a spellchecker to flag one. For each one, ask whether the word points to something associated with “it” or compresses “it is” or “it has.” Purdue OWL’s apostrophe guidance notes that possessive pronouns do not take apostrophes and that apostrophes show omitted letters in contractions. [2]
A useful practice is to write two original pairs: one sentence with possessive its, one with it’s meaning it is, and one with it’s meaning it has. Then expand both contractions aloud. Repeating the decision with different subjects—an instrument, a room, a message—helps make the distinction available during real editing rather than only in a memorized rule.
