It's up to you means “you decide” or “whatever you prefer”. You say it to hand the choice to the other person, when you don't mind either way or when the decision really is theirs. The pattern it's up to + person + to + verb shows whose responsibility something is: It's up to the teacher to check the tests.
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It's up to you.; it's up to + person + to + verb; it's up to you + what/where/whether + clause
- 'Pizza or sushi tonight?' 'It's up to you, I'm happy with either.'
- It's up to the team leader to decide who works on the new project.
- You can pay the deposit now or next week; it's entirely up to you.
What changed
First version'Should we take the train or the bus?' 'It depends on you.'
Revision'Should we take the train or the bus?' 'It's up to you.'
It depends on you can look like a close match, but it means that a result relies on that person and others are counting on them. It is not how you let someone choose between the bus and the train. To hand over the choice, say It's up to you. The question stays the same; only the reply has changed.
Don't confuse it with the question What are you up to? It means “What are you doing?” or “What are you planning?”: What are you up to this weekend? With numbers, up to means “as many as”: The hall holds up to 200 people.
Your turn
'Which film shall we watch tonight?' 'I've seen them all, so ___.'
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it's up to you — The speaker has already seen all the films, doesn't mind which one, and lets the other person choose: it's up to you. It depends on you would sound as if some important outcome relied on the other person.
A colleague asks when you are free for a call this week. Reply with it's up to you and name two days when you are available.
It's up to you. I'm free on Tuesday afternoon and all day Thursday, so just send me an invite.
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