Level 2

Can one member of a two person LLC do a SIMPLE IRA, SEP, or Solo 401k on their own without involving the LLC?

My biz partner is not interested in a retirement plan.  We have a tax accountant who does our LLC tax return and gives us a K-1 each year.    I would like to put my share of the income from the K-1 into a retirement plan.  I usually put it into a traditional IRA, but those contributions are limited to $6k.  I would like to contribute more to my retirement, so I was looking into other options (SIMPLE, SEP, Solo 401k).  Can I do one of these without involving the LLC?

Also, I do my own personal taxes through TurboTax. Is it generally easy to do a SIMPLE, SEP, or Solo 401k through TurboTax?