My wife has some student loans from 5 years before I met her.
We usually file a joint return (although that's less important now that I likely won't get Earned Income Tax Credit). So I have to file a form for injured spouse so that my taxes don't pay for her student loans.
She makes significantly less than the new standard deduction would be. Do I still have to split the standard deduction in half to give her half the credit or can I give her her full gross income (< $10k) and keep the rest to reduce my tax burden ?
If I'm not eligible for the Earned Income Tax Credit, would I still profit heavily from filing a joint return given the vastly different incomes (she makes less than 20% of what I do) ?