Tuition Remission file joint or separat

Full time faculty and recently married. Spouse will be attending undergraduate program starting in a few weeks. The school is aware and has copies of our marriage license/certificate and spouse has been awarded tuition remission. Must I file a new w2? How do I fill it out? Must we file joint can we file separate and still remain untaxed for the tuition remission? Does she have to be my dependent? We's prefer to be married/file separate but don't want to mess up the paperwork.

Thanks

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