It depends. You may file either Married Filing Joint or Married Filing Separately, but you must use one of the Married Statuses because you were married before December 31 (and congratulations!). Most people do find it more advantageous to file jointly, as this FAQ explains: https://ttlc.intuit.com/replies/3288477
Having said that, however, you are not required to file a joint return, but it is likely more advantageous to do so.
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