| Service model | Investment range | Who executes |
|---|---|---|
| Brokerage self-directed | Publicly traded securities only | Brokerage, at your direction |
| Non-traditional custodian | Alternative and conventional assets | Custodian, at your written direction |
| Checkbook control | Alternative and conventional assets | You, as manager or trustee |
Why do three different accounts all call themselves self-directed?
Self-direction is not a product. It is a description of who makes the investment decision, and three very different service models all claim the label.
The first is the brokerage account. You pick the stocks, bonds, and funds, so the account is accurately described as self-directed, but the menu is limited to what trades on a public exchange. The vast majority of retirement money sits here.
The second is the non-traditional custodian. Several dozen specialty firms administer IRAs the same way a mainstream brokerage does, handling contributions, distributions, beneficiaries, and reporting, but they carry the staff training and documentation systems to record an IRA's purchase of real estate, a private note, or a fund interest. These custodians do not sell investments and do not give advice. They are a passive processing layer: you identify the opportunity, you submit written direction, and the custodian executes the paperwork, releases the funds, and receives the income back into your account. Each of those steps carries a fee and a queue.
The third is checkbook control, and it changes the servicing model rather than the account type. A legal entity sits between the retirement plan and the investment, and you hold signing authority over that entity. The plan still has a custodian where one is required by law. What it no longer has is a third party standing between you and every transaction.
What can a self-directed plan actually invest in?
The IRS does not publish a list of approved investments. The tax code works in the opposite direction: it names a short list of what a retirement plan cannot hold, and everything else is permitted so long as the transaction does not violate the rules against self-dealing.
Life insurance contracts are prohibited for IRAs under IRC Section 408(a)(3). Collectibles are prohibited under IRC Section 408(m)(2), a category that includes artwork, antiques, gems, alcoholic beverages, and most coins, with a narrow exception for certain bullion and US Eagle coins that must stay in the custodian's physical possession. An IRA also cannot hold S corporation stock, not because of an IRA rule but because IRC Section 1361 limits who can be an S corporation shareholder.
That leaves a wide field. Rental property, fix and flip projects, raw land, private mortgage notes, tax liens and deeds, private company stock, venture and private equity funds, cryptocurrency, and mineral rights are all commonly held in self-directed plans, alongside conventional securities if you want them. The investment universe is the same for every plan type discussed here. What differs is how much friction stands between the decision and the closing table.
How is checkbook control different from a custodian-held account?
In a checkbook IRA, the IRA makes one investment: it buys an IRA LLC or an IRA Trust formed for that purpose. Cash moves from the custodian into the entity's bank account, and you serve as manager of the LLC or trustee of the trust. From that point you sign the purchase contract, wire the earnest money, pay the roof repair, and deposit the rent, all without submitting a direction letter or waiting on review.
The custodian stays in place. It reports the IRA's fair market value to the IRS on Form 5498, tracks your beneficiary designations, and processes everything that happens at the IRA layer.
Important: contributions, rollovers, transfers, and distributions all move through the custodian. The entity checking account is for investing, never for putting money into or taking money out of the plan. Mixing those two layers is the single most common structural error in a checkbook plan.
The practical difference shows up in two places. The first is speed. A courthouse auction, a foreclosure sale, or a seller who wants proof of funds by Friday cannot accommodate a custodial review cycle, and those deadlines are exactly where custodial accounts fail their owners. The second is cumulative cost. The friction is rarely the first purchase. It is the tenth invoice on a rehab, each one a separate request, each one billed. How that plays out transaction by transaction is covered in How checkbook control actually works.
How does checkbook control work in a Solo 401(k)?
A Solo 401(k) reaches the same place with one layer instead of two. It is a qualified employer plan rather than an IRA, so the custodial requirement of IRC Section 408 does not apply to it at all. The plan itself is a trust, you serve as trustee, and the plan trust opens its own bank or brokerage account and holds investments directly.
There is no custodian, no separate LLC or trust to form, and no custodial transaction fees. The trade-off is eligibility: the plan requires self-employment income from a for-profit business and no full-time non-owner employees. A day job, an employer 401(k), and a participating spouse are all compatible with it. The full test, including the common-law employee and controlled group rules, is in Solo 401(k) eligibility: key things to know.
What stays the same once you self-direct?
Everything that makes a retirement account a retirement account. Contribution limits, deduction rules, the age thresholds for penalty-free distributions, required minimum distributions, Roth qualification, and beneficiary treatment are identical to a conventional plan of the same type. A self-directed Roth IRA is a Roth IRA. The tax shelter does not weaken because the asset is a duplex instead of an index fund.
The rules that demand more attention are the ones a brokerage account never forced you to think about. Your plan cannot transact with you personally or with disqualified persons, a group that includes your spouse, your parents, your children, and entities you control. You cannot use plan property personally, not even at market rent. Debt-financed income inside an IRA can trigger tax at the plan level. These are covered in Prohibited transactions, and the prohibited transaction rules under IRC Section 4975 are worth reading before your first purchase rather than after it.
Frequently Asked Questions
Is a self-directed IRA a special type of IRA?
No. There is no separate account type called a self-directed IRA in the tax code. It is a Traditional, Roth, SEP, SIMPLE, or inherited IRA held with a custodian willing to document alternative assets. The tax rules, contribution limits, and distribution rules are unchanged. What changes is the range of investments available and, with checkbook control, who executes the transaction.
Is checkbook control legal?
Yes. IRA LLC and IRA Trust structures have been in continuous use since the early 1990s. Swanson v. Commissioner, 106 T.C. 76 (1996), established that an account holder directing an IRA-owned entity is not self-dealing under IRC Section 4975, provided the benefit flows to the IRA rather than to the account holder personally. The IRS does not approve or disapprove any structure. Compliance depends on how the structure is used.
Do I still need a custodian if I have checkbook control?
For an IRA, yes. Every IRA requires a custodian under IRC Section 408, and that does not change when the IRA owns an LLC or trust. The custodian handles annual reporting, beneficiary records, and any movement of money into or out of the IRA. A Solo 401(k) is different: it is not an IRA, so no custodian is required.
Can I move an existing retirement account into a self-directed plan?
Usually. Traditional, Roth, SEP, SIMPLE, and inherited IRAs can be transferred, and 401(k), 403(b), 457, and TSP balances from a former employer can generally be rolled over. A current employer's plan may or may not allow an in-service rollover. Traditional and Roth funds stay in separate plans, since the two tax treatments cannot be blended in one account or one entity.
How long does setup take?
An IRA Trust or Solo 401(k) is formed in two to three days. An IRA LLC takes one to three weeks depending on the state's filing speed. Getting to a plan that is funded and ready to invest runs two to four weeks, driven mostly by how fast your current institution releases funds. Starting the rollover request early is the single best way to compress the timeline.
Next steps
You now know what self-direction means and where checkbook control changes the mechanics. The question left is which structure fits the assets you intend to buy. Answer a few questions with the Plan Finder to see whether an IRA LLC, IRA Trust, or Solo 401(k) matches your situation, or compare setup costs and features across all three on the Plans page.