A two-track framework holding all investment activity in fully independent silos. The retirement track and the personal track share no common ownership and no inter-track activity — the §4975 firewall down the center is structural, not advisory.
Entity Map
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Structural Rules & Assumptions
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Track 1 — C-Corp blocker constraints:
Each SDIRA owns ≤19% of any single blocker (conservative buffer well under the §4975(e)(2)(G) 50% disqualified-person line).
One operator per blocker. A second operator's deals require a separately formed, separately owned blocker — replicate the structure rather than commingling operators in one C-corp.
SDIRA may be the taxpayer's or the spouse's — but see the open question below before assuming both can co-own one blocker.
Checkbook-LLC path is reserved for genuinely passive, un-leveraged, no-UBTI deals only.
Open question (flagged for ERISA counsel): Can the taxpayer's SDIRA and the spouse's SDIRA each own ≤19% of the same blocker? See discussion in chat — this is not yet resolved on the diagram.
Transition Workplan
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Current entity
Current treatment
Target position
Action items
Tax consequence / trigger
Track
e.g. Existing operating LLC
Disregarded to individual
Track 2 — SMLLC under Family Holding C-Corp
Contribute membership interest to holding; update operating agreement & EIN responsible party
Firewall rule of thumb for the workplan: any action item that would put a Track-2 entity (including the management S-corp) in an ownership, fee, lending, or service relationship with a Track-1 entity is a non-starter — it likely triggers a §4975 prohibited transaction. When in doubt, the two tracks get separate counsel, separate bank accounts, and separate books.