A prohibited transaction is any use of an IRA's money or assets that serves you, a close relative or another "disqualified person" instead of the account. In a Bitcoin IRA, one of them can end the account's tax shelter for the whole year.

The question usually comes up at setup. Someone opens a self-directed IRA, which is an IRA whose custodian allows assets beyond stocks and funds, and then wonders whether they can keep the coins on their own hardware wallet, move them through their personal exchange login, or borrow against them. The rules behind that question are in Internal Revenue Code Section 4975. For several of those moves, the answer is that doing it once can cost the entire account.

How one transaction disqualifies the whole IRA

The statute starts with people. A disqualified person is you, your spouse, your parents and grandparents, your children and grandchildren and their spouses, the account's fiduciaries and service providers, and any entity that these people own 50% or more of. According to uDirect IRA Services, siblings, aunts, uncles, cousins and unrelated friends are not on the list.

The statute then lists six kinds of dealing between the IRA and those people. They are selling, exchanging or leasing property, lending money or extending credit, furnishing goods, services or facilities, transferring the IRA's income or assets to a disqualified person or for their benefit, fiduciary self-dealing, and a fiduciary taking payment from a third party who deals with the plan. The IRS sums it up in one line: "A prohibited transaction is the improper use of IRA assets by the IRA owner, beneficiary or any disqualified person."

The consequence is what makes this rule unusual. Under the IRS investment FAQs, if the owner engages in a prohibited transaction, "the account stops being treated as an IRA as of the first day of that year." The whole balance is treated as distributed on January 1, and the IRS taxes the full value, not only the coins involved. IRA Financial notes that this generates a Form 1099-R for the entire account. Ordinary income tax applies, and so does the 10% early withdrawal penalty if you are under 59 and a half.

There is a separate penalty for other people who take part. A disqualified person who engages in the transaction owes a 15% excise tax on the amount involved for each year or partial year it remains uncorrected. That rises to an additional 100% if it is never corrected.

The four Bitcoin moves that trigger it

Holding the IRA's keys yourself. This one is contested. In a checkbook IRA LLC, the IRA owns 100% of an LLC and you manage it without pay. That setup makes it technically possible to put the LLC's Bitcoin on a cold wallet you control. The obstacle is McNulty v. Commissioner (157 T.C. No. 10, decided November 18, 2021). As IRA Financial summarizes, the Tax Court held that "an IRA owner cannot take personal possession of an IRA asset and cannot have unfettered control over any IRA asset." No court has yet ruled on a hardware wallet held through an LLC. The industry is exploring safeguards, including blockchain audit trails, third-party depositories and multi-signature wallets, but none has been tested. Until a ruling settles the question, a seed phrase in your desk drawer is a bet on how a judge reads McNulty.

Routing coins through your personal exchange account. IRA Financial names this as a common violation: moving IRA money into your own exchange login to buy, then sending the coins back. Every dollar and every coin in a self-directed IRA has to move through the custodian. Moving IRA crypto to your personal wallet is treated as a taxable distribution.

Lending or pledging the coins. If you use IRA Bitcoin as collateral for a personal loan, you are extending credit between the plan and a disqualified person under §4975(c)(1)(B). The rule also reaches indirect versions of the same thing. In Peek v. Commissioner (2013), the owners personally guaranteed notes of a company their IRAs owned, and the court treated that guarantee as an indirect extension of credit.

Buying coins from yourself or family. If you sell your own Bitcoin to your IRA, you are dealing with yourself, and the same applies to a parent or child selling to it. The clean route is cash. The IRS does not accept in-kind crypto contributions, so you cannot simply move coins you already own into the account.

What one pledged loan could cost

This example is hypothetical. A 48-year-old has a traditional IRA worth $200,000 on January 1 and pledges $20,000 of its Bitcoin as collateral for a personal loan in June.

Value treated as distributed$200,000 (the full account, not the $20,000 pledged)
10% early withdrawal penalty$20,000
Ordinary income taxOn all $200,000, at the owner's bracket

The bill runs to tens of thousands of dollars before income tax is even counted, and the account's future tax-sheltered growth is gone. uDirect's own worked example puts the immediate hit on a $300,000 Roth violation at age 45 at roughly $112,000 to $122,000.

Not the same as a collectible or an early withdrawal

Prohibited transaction Often confused with
Collectibles rule About who you deal with and how: self-dealing with the account About what the IRA buys. Art, gems and many NFTs are barred outright. Bitcoin is not listed as a collectible.
Early withdrawal The whole account is taxed as of January 1 Only the amount you take out is taxed, plus 10% if under 59 and a half

Questions to settle before you fund the account

The safest Bitcoin IRA is one where you cannot reach the coins yourself. Before you fund an account, ask the custodian three things. Who holds the private keys? Does every purchase and sale run through the custodian? Is there any path for coins to reach a wallet or exchange login in your name?

Custodial models exist so that you never have to answer the McNulty question. One example is IRA Financial's IRAfi Crypto, which buys through Bitstamp and keeps the keys with the custodian. IRA Financial has listed it at about $100 a year in one guide and $495 a year in another, so confirm the current fee before signing up. If you want the access that a checkbook LLC gives you, treat it as a legal structure that needs a tax attorney, not as a way to hold your own keys.

Which custody setup keeps your hands off the keys?

The full guide walks through setting up a Bitcoin Roth IRA with a custodian and the mistakes that cost the account.

Read the Bitcoin Roth IRA guide