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Is it adventageous to expedite my wedding before the new year for tax savings?
You are correct. If you get married by December 31, you will file as married for this year (Married Filing Jointly or Married Filing Separately) instead of Single. That could indeed save you some amount of taxes, if your situation is as you described. Some people do plan their date of marriage in such a way to optimize tax savings. Whether your marriage date should be set in such a way is your personal decision.