U.S. Taxation Law:
If one of you has much less income than the other, consider getting married in December rather than January. You will generally be taxed less on the same income if you are married filing jointly than you would be if each of you filed single returns. If both of you have similar levels of income, choose January. Marriage partners who earn approximately the same income may pay more tax if they file a joint return or file separate married returns than they would if they could file two single returns. This is known as "the marriage tax penalty."
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