A co-tenant in a month-to-month tenancy who wants to leave is legally responsible for giving the landlord proper written notice and paying rent through the end of the notice period. If there's a lease, the tenant should either get permission from the landlord to leave early or, if this is impossible, find a new tenant who is acceptable to the landlord. If a co-tenant simply leaves without the landlord's okay or without an acceptable substitute, the fallout can be serious.
The unauthorized departure of a co-tenant gives the landlord the option of evicting the rest of you, even if you are able to pay the full rent. The landlord has this option because breaking the lease or rental agreement by even one tenant is a violation of a key lease term (the length of stay), for which all tenants are liable.
In practice, however, your landlord will probably let you stay if you can keep a steady stream of rent money coming in and keep the place occupied by stable, nondestructive tenants. So if you want to stay after a co-tenant has broken the lease and left, the landlord will probably not evict you and other tenants unless:
Always get your landlord's approval before moving in a new roommate. If a co-tenant takes off and leaves you facing the entire rent, you may be tempted to simply move in another roommate, bypassing the landlord's application process. Don't! Your lease or rental agreement probably prohibits unauthorized sublets. If it does, bringing in a new tenant -- even a great one -- without your landlord's okay violates your agreement and gives your landlord a watertight reason to evict you. Instead, keep your relationship on an honest footing and get your landlord's approval for a replacement tenant. (For more information, see Adding a Roommate to the Lease or Rental Agreement.)
Remaining roommates need to cover their legal flanks with respect to the departed tenant as well as the landlord. If your housemate has left during the middle of a lease or without proper notice in a month-to-month tenancy, leaving you responsible for all the rent, your personal relations will be rocky at best. Probably the last thing you want is to have your errant roommate reappear expecting to move back in.
To avoid such surprises, try to get your former roommate to sign an agreement, making it clear that the departing tenant:
But what if you and the departing roommate can't work things out, and the departed co-tenant shows no signs of paying? If your roommate is long gone or out-of-state, you may want to grit your teeth, pay his share and forget it, since trying to find him, sue him, and then collect the judgment is likely to be more trouble than it's worth.
On the other hand, if your ex-roommate is still in town and has a source of income, consider taking the time to sue him in small claims court for unpaid rent, damage to the rental unit, unpaid utilities, and your costs to find a replacement co-tenant, such as advertising. Then, if your ex-roommate still doesn't pay up, you can collect what you won in court from his bank account or wages. For more information, see the Small Claims Court section of Nolo's website.
If your co-tenant skips out, leaving you in the lurch, you may decide that it's not worth the hassle of trying to stay and rustle up another roommate.
To ease your departure and forestall the landlord from keeping your security deposit to make up for unpaid rent, or listing you as a deadbeat at the credit bureau, follow these steps:
For critical legal and practical information that every renter needs, see Renters' Rights: The Basics, by Janet Portman and Marcia Stewart (Nolo).