Ask any brokerage customer service rep what you can put in a Roth IRA and the menu they describe will sound like a drive-thru. Stocks. Mutual funds. Bonds. Maybe ETFs if they are feeling modern. That's it. That's the conversation most Americans ever have with a custodian about their retirement account. And that conversation leaves 95% of what the IRS actually allows completely off the table.
The real menu is much bigger. Under IRC §408, an Individual Retirement Account can hold almost any asset that is not specifically prohibited. The prohibited list is short — life insurance contracts, collectibles like art and wine, certain coins, and anything that constitutes self-dealing with a disqualified person. Everything else is on the table. Private company stock. LLC interests. Real estate. Precious metals bullion. Notes and loans. Cryptocurrency. Tax liens. Racehorses, if you're into that. The reason you've never heard of any of this is that Fidelity and Schwab don't make money on exotic assets, so they don't tell you about them.
A self-directed Roth IRA — commonly called an SDIRA — is a Roth IRA held at a custodian who allows the full legal menu. The tax treatment is identical to a regular Roth. Contributions are after-tax. Growth is tax-free. Qualified withdrawals after 59½ are tax-free. The only difference is what you are allowed to buy inside the wrapper.
Why This Matters For Founders And Angels
Here is the math that changes the game. Say you angel-invest $25,000 into an early-stage company at a $5 million post-money valuation. Five years later the company sells for $500 million. Your 0.5% stake is now worth $2.5 million. A 100x return on paper.
In a taxable account, you hand the IRS roughly $600,000 to $750,000 on that exit between federal capital gains, net investment income tax, and state tax, depending on where you live. In a self-directed Roth IRA, you hand the IRS zero. The entire $2,475,000 gain sits in the wrapper, compounding until you pull it out tax-free in retirement.
Now run that math across a portfolio. A typical angel portfolio is structured to absorb a lot of zeros in exchange for one or two outsized winners. The winners are what fund retirement. If you put those winners inside a Roth wrapper, the after-tax outcome of a successful angel portfolio roughly doubles. I am not exaggerating. Double. That is the power of moving the wrapper, not the asset.
The asset doesn't change. The wrapper does. And the wrapper is worth half of everything you will ever earn from that asset.
The Custodians That Actually Allow It
You can't do this at Fidelity or Schwab. You need a custodian built for the self-directed world. The three I see mentioned most by founders I know are:
- Rocket Dollar — set up for startups and alternative assets, flat fees, LLC structure for faster transactions (the "checkbook IRA")
- Equity Trust — the largest self-directed IRA custodian, longer track record, good for complex real estate
- Alto IRA — newer, with integrations into AngelList, Republic, and other platforms. Designed for startup angels
Every custodian charges fees differently. Some flat, some percentage-of-assets, some per-transaction. Read the fee schedule before you open the account. I've watched founders pick the wrong custodian and pay multiples more per year than they needed to. The difference on a $500,000 account can be thousands annually, which matters because those dollars could have been compounding instead of paying admin.
The Prohibited Transactions Rule (The Part That Will Kill You)
This is the rule that sends self-directed IRAs off the rails. The IRS says you can't engage in a prohibited transaction with a disqualified person. A disqualified person is you, your spouse, your parents, your kids, your grandkids, anyone who provides services to the IRA, and entities controlled by any of those people. The list is narrower than it sounds — siblings and cousins are generally not disqualified, for example — but the consequences of crossing the line are nuclear.
If you commit a prohibited transaction, the IRS treats your entire Roth IRA as distributed on the first day of that year. You owe taxes on the whole balance plus a 10% penalty if you are under 59½. A one-time mistake can wipe out twenty years of compounding in a single audit.
What counts as prohibited? The clearest examples. You cannot invest your Roth in a company you personally own or control. You cannot lend your Roth money to your own business. You cannot buy a house with your Roth and live in it. You cannot pay yourself to manage property held by your Roth. You cannot invest in a startup where you are the founder and hold significant control. The line is "no benefit to the disqualified person from IRA assets." Stay on the right side of it.
Where it gets fuzzy — and where people get burned — is third-party startups where you happen to know the founder, side deals where you're pitching the LLC manager, or LP interests in a fund you also work for. This is where you stop guessing and call a tax attorney before wiring any money. The cost of the attorney is a rounding error compared to the cost of blowing up the Roth.
The UBIT Trap Nobody Tells You About
Here's the other trap. Unrelated Business Income Tax — UBIT — applies to IRAs that hold operating businesses or use leverage. If you buy a piece of real estate with a mortgage inside your Roth, the income attributable to the mortgaged portion can be subject to UBIT at trust tax rates, which are punishing. If you invest in a partnership that operates an active business, the pass-through income can also trigger UBIT.
Most startup equity held as stock doesn't trigger UBIT because the gain is capital gain, not business income. But LLC interests, partnerships, and leveraged real estate need to be structured carefully. Again — cheap attorney consult, expensive mistake. I learned this the hard way on a real estate deal years ago where I did not understand the UBIT implications of leverage inside a retirement account. The tax bill at the end was not a rounding error.
Real Examples From People I Know
Here's what it actually looks like in practice. A founder I know angel-invested $50,000 into three early-stage companies through a self-directed Roth with a checkbook LLC structure. Two went to zero. One exited for 80x. Her Roth went from $150,000 contributed to roughly $2.1 million. All of it tax-free. The strategy for her was simple — use the self-directed Roth exclusively for high-variance early-stage bets, keep her boring index fund money in a regular taxable brokerage where she can harvest losses.
Another operator I know uses his self-directed Roth for real estate. He buys rental properties in the Midwest through the Roth, cash only, no leverage (to avoid UBIT), and lets the rental income compound inside the wrapper. He's not getting 100x returns — he's getting 8-10% cash yield tax-free for thirty years. Boring. Effective. Probably better risk-adjusted than the angel portfolio over a long horizon.
Both strategies work. Both take the wrapper seriously. Both have been vetted by attorneys who know the prohibited transaction rules cold.
The Challenge
What investment are you about to make in 2026 that could go in a self-directed Roth instead of a taxable account? Is it an angel check? A real estate deal? A pre-IPO secondary? Crypto? Go look at the check you are about to write. If it has 10x potential, that appreciation belongs inside a tax-free wrapper, not a taxable one. Open the self-directed Roth first, fund it, then write the check from the Roth. The order matters. The tax savings over the life of the investment are not a rounding error — they are half of everything you'll ever earn on that bet.
For the mechanics of getting money into the Roth in the first place, see the backdoor Roth IRA guide.
Further Reading
- IRS — Retirement Topics: Prohibited Transactions
- IRS — Individual Retirement Arrangements (IRAs)
- SEC Investor Alert — Self-Directed IRAs and Fraud Risks