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There is already a similar question here, but it is about forming questions: Which is the correct question ("Who has" vs "Who have")?
When combining who with you in a statement, which is correct and why?
It is you who has chosen.
It is you who have chosen.
who is third-person singular, so it takes has. you is second-person, so it takes have.
Does the verb to have conjugate with you or who in this sentence? Which one is correct, or can it vary?
It's you who has chosen.
It's you who have chosen.
The former isn't grammatical whereas the latter is OK.
It's a cleft sentence divided into two clauses. The first clause "it's you" is a focussed clause. The verb in the second clause agrees with the subject in the first clause; if the subject is in the singular or plural, the verb in the other clause is used accordingly. But, as the pronoun you, whether in the singular or plural, always takes a plural verb, you must use have, not has, in the sentence presented.
I think it depends on the number of people you're talking about. If it is just one person, then use has. If it is more than one person, use have. It all really comes down to this simple rule.
Example #1:
It is you who has broken the law here! Not me!
Example #2:
It is you guys who have broken the law here!. Not me!
