LP positions inside a self-directed retirement account, or keep them taxable

The custodian side is worth pricing before the tax side. Every self-directed custodian I've looked at charges an annual fee per asset, plus transaction fees, plus something for holding an illiquid position they have to value each year. On a $50k position that can be a real drag, and it doesn't stop while the deal is paused. Ask the custodian for their fee schedule in writing and see what a five year hold actually costs you.

I hold my small multifamily directly and my one LP position taxable, and the depreciation is the reason. On my own buildings I can see exactly what the pass-through does to my return. Putting that same feature into an account that can't use it felt like buying a tool I'd already own twice. Of course, I only get to say that because I had the cash outside retirement. If the only $50k I had was in an old 401k, I'd be looking hard at the IRA route despite everything.

Questions before I'd vote on this. Who signs the subscription documents if the account owns the interest, the custodian or me? What happens if the deal calls capital and the account doesn't have cash sitting in it? Can the account even fund a call, or do I get diluted because the money is somewhere I can't move it fast? And who receives the K-1, me or the custodian, and who's responsible if a filing is required at the account level? Those feel like the practical failure points, more than the theory.

@anchor the mechanics answer most of your list. The custodian signs as owner of the interest at your direction, the K-1 goes to the account, and any filing obligation belongs to the account rather than to you personally. The capital call problem is the one people actually get hurt by. If your account is fully deployed into one illiquid position and a call comes, you can't just wire from your bank, so I keep cash uninvested in the account against exactly that. My rule is a reserve sized at a fifth of the committed amount, which is a guess, not a formula.

On the debt-financed income question, sponsors will sometimes tell you their structure is designed around it and sometimes tell you to ask your own advisor. Get the answer in writing from the sponsor and confirm how it applies to your account with a tax professional, because it turns on facts about both the deal and the account.

Patience argument for the wrapper. I'm not touching that money for eighteen years either way, so the thing I care about is that gains keep rolling without me making a decision every time a deal exits. Inside the account an exit just becomes cash I redeploy. Taxable, an exit is a tax event and a rebalancing conversation in the same month, and I've watched that push people into a rushed follow-on deal. Both wrappers hold the same asset, one of them makes me act less often.

I want the version that doesn't require me to understand a filing I've never heard of, so I'll say taxable and accept it's the less clever answer. @orchard's point about redeploying without a tax event is the strongest thing in this thread against me, though. If I ever do use retirement money for one of these it'll be a deal with modest debt on it, not because I've worked out the rules, more because less debt seems to mean fewer surprises reaching the account.