Quick Read
Romney built an IRA worth up to $100 million by loading Bain Capital private fund interests into a self-directed wrapper that is still fully legal today.
The IRS permits self-directed IRAs to hold private company shares, LLC interests, and real estate; brokers restricting you to public stocks is their policy, not law.
One prohibited transaction under Section 4975 disqualifies your entire IRA retroactively, making the full balance immediately taxable plus a 10% early-withdrawal penalty.
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If you own an IRA, you already have the same wrapper Mitt Romney used to build a retirement account reportedly worth between $20 million and $100 million, back when the annual contribution cap was just $6,000. The buried benefit: your IRA does not have to hold public stocks and mutual funds. A self-directed IRA can own private company shares, LLC interests, pre-IPO founder stock, private real estate, and other alternative assets, and every dollar of growth stays inside the tax shelter. That is the Romney IRA loophole, and it is still legal in 2026.
The Rule Hiding in Plain Sight
Nothing in the tax code caps how big your IRA can grow. The code only caps what you contribute each year, which for 2026 is $7,500, plus a $1,100 catch-up if you are 50 or older. What happens after the money is inside is up to the investments you pick. If you buy 1,000 shares of a private startup for $0.01 each inside a Roth IRA and those shares later sell for $500 apiece, the entire windfall grows tax-free. That is the math Romney used with Bain Capital fund interests, and any founder, early employee, or private-fund investor with an IRA can use the same wrapper today.
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Where the Law Actually Says This
The authority is Internal Revenue Code Section 408, which defines individual retirement accounts and lists only a short set of prohibited holdings: life insurance, collectibles, and S-corporation stock. Everything else, including privately held C-corp shares, LLC and LP interests, private notes, and real estate, is allowed. The custodian rules that let banks and brokerages restrict you to public securities are their choice, not the IRS’s. A self-directed IRA custodian, regulated under the same section, will hold the alternative assets for you. Prohibited transactions and disqualified persons are governed by IRC Section 4975, which is where most people trip.