Use it’s (with an apostrophe) only when you mean “it is” or “it has.” Use its (no apostrophe) to show that something belongs to “it.” The quickest check: read the sentence aloud and expand the word to “it is.” If it still makes sense, it’s is correct. If it sounds wrong, you need the possessive its.
The rule in one line
These two words sound identical, which is why even careful writers slip. But they do completely different jobs:
- it’s — a contraction of it is or it has. The apostrophe marks the missing letter or letters (it is → it’s).
- its — the possessive form of it, meaning “belonging to it” (the same way his means “belonging to him”).
That is the whole rule. Everything else is just applying it.
The apostrophe test
You never have to guess. Whenever you’re unsure, mentally replace the word with “it is” (or “it has”):
- “It’s going to rain.” → “It is going to rain.” ✓ Makes sense — keep the apostrophe.
- “The city is proud of its history.” → “The city is proud of it is history.” ✗ Nonsense — so drop the apostrophe and use its.
If “it is” or “it has” fits, write it’s. If it doesn’t, write its. This single test resolves virtually every case you’ll ever meet.
Why this one is so easy to get wrong
Here’s the trap. In English we normally build possessives by adding apostrophe + s: the dog’s bowl, Maria’s phone, the company’s profits. So your instinct screams that “belonging to it” should be spelled it’s, with an apostrophe. That instinct is wrong.
It is a pronoun, and possessive pronouns never take an apostrophe. Look at the whole family: my/mine, your/yours, his, her/hers, its, our/ours, their/theirs, whose. Not one of them has an apostrophe. Its simply follows his and hers. Once you group it with those words instead of with dog’s and Maria’s, the apostrophe-free spelling stops looking strange.
Correct vs incorrect: possession (its)
- ✓ The dog wagged its tail. — ✗ The dog wagged it’s tail.
- ✓ Every problem has its solution. — ✗ Every problem has it’s solution.
- ✓ The phone is dead; its battery finally gave out. — ✗ … it’s battery finally gave out.
- ✓ The team celebrated its first win. — ✗ The team celebrated it’s first win.
- ✓ Water finds its own level. — ✗ Water finds it’s own level.
Correct vs incorrect: it is / it has (it’s)
- ✓ It’s raining again. (it is) — ✗ Its raining again.
- ✓ I think it’s too expensive. (it is) — ✗ I think its too expensive.
- ✓ It’s been a long day. (it has been) — ✗ Its been a long day.
- ✓ Don’t touch the pan — it’s got a loose handle. (it has got) — ✗ … its got a loose handle.
- ✓ It’s not my fault. (it is) — ✗ Its not my fault.
Tricky cases and exceptions
“It’s” can mean “it has” — but only sometimes
It’s is a valid shortening of it has only when has is a helper verb (as in the perfect tense): “It’s rained all week” (it has rained), “It’s got four seats” (it has got). When has is the main verb meaning “possesses,” you cannot contract it. “It has three legs” never becomes “It’s three legs.” Say it in full and the mistake is obvious.
“Its’” is never a word
Some writers, hunting for the possessive, land on its’ — apostrophe after the s. There is no such word in English. The possessive is always its, with no apostrophe anywhere. If you’ve written its’, it’s wrong every single time.
The identical trap: whose vs who’s
Its/it’s has a twin pair that follows exactly the same logic: whose is possessive (“Whose coat is this?”) and who’s means “who is” or “who has” (“Who’s coming?”). Master one pair and you’ve mastered both.
Contractions and formality
Because it’s is a contraction, some formal and academic styles prefer the full it is / it has. That’s a stylistic choice, not a grammar rule — it’s is perfectly correct in almost all writing. The possessive its, by contrast, is never optional: there’s no longer form to fall back on.
A memory trick that sticks
Remember: the apostrophe replaces a missing letter — here it never signals ownership. If nothing is missing from the word, nothing gets an apostrophe. Or keep it even simpler and file its next to his: “his tail, its tail.” Neither one wants an apostrophe.
US vs UK: any difference?
None. This is one of the rare spelling-and-usage points where American and British English agree completely: it’s is the contraction, its is the possessive, on both sides of the Atlantic. Style guides from Chicago to Oxford give the same instruction, so you can apply the apostrophe test with total confidence wherever you’re writing.
One historical footnote explains why the confusion runs so deep: for much of the 1600s, writers actually did spell the possessive it’s, apostrophe and all. The apostrophe-free its only settled in as the fixed standard later — so the “wrong” version is really just a spelling the language abandoned centuries ago.
