It is almost always better to file Married Filing Jointly. Many people think they come out better when filing Married Filing Separately but they are filling out their married filing separate returns incorrectly. If one person itemizes deductions then the other one must itemize too, even if it's less than the standard deduction. And there are several credits you can't take when filing separately, like the Child Care Credit, Earned Income Credit, and Education Credits. You also cannot deduct student loan interest.
Also to do it online you need to use two separate accounts and pay for 2 returns. The desktop version can do unlimited returns and it has what if scenarios and you can see and enter into the actual forms.
There is no advantage to filing separate returns just because one spouse has income and the other doesn't, one has more income than the other, one has a business and the other doesn't, or because the spouses married during the year.
