Individual retirement accounts for a partnership

Agaric is a cooperative but the United States worker-owners are taxed as partners in a pass-through LLC.

https://www.irs.gov/retirement-plans/retirement-plans-faqs-regarding-seps

https://www.irs.gov/retirement-plans/choosing-a-retirement-plan-simple-401k-plan

https://www.irs.gov/retirement-plans/plan-sponsor/simple-ira-plan

Decent overview: https://www.415group.com/tax-favored-retirement-plans-for-partnerships

Very wide overview of everything: https://investmentfirms.com/best-401k-alternatives/

https://www.irahelp.com/forum-post/29757-solo-401k-partnership-firm

https://www.solo401k.com/llc-contributions/

https://individual401k.com/rules.html

SEP vs Solo 401K

https://smartasset.com/retirement/sep-ira-vs-solo-401k-which-is-better

https://www.guideline.com/blog/sep-ira-vs-401k/

Defined Benefit Plan

Comparison with others: https://www.mlrpc.com/articles/tax-favored-retirement-plans-partnerships/

https://saberpension.com/2019/05/01/defined-benefit-plan-self-employed/#Chapter5

SEP IRA account options

digital credit union SEP IRA https://www.dcu.org/bank/retirement/ira-savings.html

https://investor.vanguard.com/accounts-plans/small-business-retirement-plans/sep-ira

Solo 401K account options

https://investor.vanguard.com/accounts-plans/small-business-retirement-plans/individual-solo-401k