A couple of notes:
1. If you live in a community property State, you DO NOT need to split income 50/50 per se. Spouses can choose to split income as they both see fit, including possibly classifying each of their income as their own as separate
2. Even if filing jointly is advantageous for a couple, a couple may still want to do a MFS vs. MFJ analysis to see who owed (or was refunded) more, who owed (or was refunded) less to ensure tax filing/returns were equitable to each
This is the main reason I still do not use TurboTax: the lack of a comparative analysis, allowing a couple to specify income division for each taxable income entry (e.g. each W2, each 1099-DIV, each 1099-MISC, etc.), being allowed to do an MFS vs. MFJ analysis out of the box, then allowing the couple to do their internal finances/planning more transparently and equitably
