Deductions & credits

@KrisD15 & @MaryK4 , do either of you have references for your answer so I can review?  I was told we can't contribute to our ROTH IRA if we've already maximized on our solo401K contribution by a solo401K administrator.  I would like to  review the reference so I can understand it better & maybe communicate with the solo401K administrator again with that reference.

 

Thanks.