Look at the new tax policy, no marriage makes more sense:

来源: 于 2013-01-02 11:05:54 [旧帖] [给我悄悄话] 本文已被阅读：次

pay more tax if >=400,000 (single)  or >=450,000(joint)

If single man makes 390,000 and single woman makes 390,000 each live together, nither of them pays extra, if married, they have to pay more.