It’s = It has (not possessive)

ITS

Its indicates possessive.

Or, put a more technical way, its is the possessive form of the neuter pronoun “it” — his, her, its.

Examples:

Its possessive

“Every dog has its day.”

“The jury has reached its decision.”

“Stop its momentum!”

“Guess its color.”

A Good Rule of Thumb:

If you can replace it with his or her, there's no apostrophe.

A Mnemonic Device:

The possessive dog had its tail removed.

ITS’

Its’ is never correct. Ever.