I own properties and have a property manager, so I will be writing from this point of view. First off, what you should do is start paying rent separately. It will totally be accepted with a short phone call saying 'hey, I'm going to pay my rent and my roommate will pay hers' (unless your landlord is a douche, which some are). Secondly, you cannot evict your roommate, nor would I necessarily evict a tenant solely because they were 3-5 days late on their payment. I hate it when tenants pay late because I still have mortgage, insurance, property manager fees, and tax payments that I do not get a chance to 'pay late'. Eviction usually takes 3-6 months, so only under situations such as not paying or causing a thousand in damages or having the cops called on them several times would I evict someone. I have evicted two people for not paying...ever. It does hurt credit scores to not pay rent on time if your landlord is a douche.