Get your taxes done using TurboTax

I ran the number in Turbotax Online, and could reproduce the problem there.   Simplified the data, and came up with a cutoff at $2500 of unearned income.  If it's above this (eg $2501), the fed tax due is $1068 (see screenshot).   Otherwise fed tax is $0Screenshot 2024-03-08 at 7.10.40 PM.png