If you are legally married to your partner, then you can file a joint return and combine W2's and 1099 forms. If not, you will file separate returns and each partner will use their own W2's and 1099's.
The IRS only allows a couple to file a joint tax return if the state they reside in recognizes their relationship as a legal marriage.
Unmarried couples are never eligible to file joint returns. Even if your wedding is on December 31, the IRS will consider you as being married for that tax year.
@BARRacine
