UCSC Housing payment after SIR? What's the process?

Hello,

I haven’t submitted my SIR yet and was wondering when I do, do I immediately choose housing or what? Is there a deposit for housing I must pay and is it refundable if say I get into another school from my waitlists? I was worried that I should submit my SIR today lest I not have time to choose my housing.

I held off on the SIR because I am waiting for my waitlist results and I didn’t want to have to pay the nonrefundable SIR AND potential housing deposit if I was still waiting. Any insight would be really great!