These two English words are very often used incorrectly by native speakers. It's important that you understand the difference.
 

It's

It's is a contraction of "it is" or "it has."

It's time to go.

Do you think it's ready?

I read your article - it's very good.

Do you know where my purse is? It's on the table.

It's been a long time.

Its

Its is the possessive form of "it."

That's an interesting device - what is its purpose?

I saw Les Misérables during its initial run.

This stove has its own timer.

The bird lost some of its feathers.

Where is its head office?

 
The Bottom Line

The confusion between it's and its occurs because on virtually every other word 's indicates possession, so English speakers naturally want to use it's to mean "something belonging to it." But it's is only used when it's a contraction of it is or it has.

The ironclad rule - no exceptions - is that if you can replace the word with "it is" or "it has," use it's. Otherwise, it's always its.
 

Related difficulties:

• apostrope s
• hers vs her's
• ours vs our's
• theirs vs their's
• whose vs who's
• yours vs your's
   

More English Difficulties

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