The IRS never banned real estate in IRAs. Your broker won't offer it because they make commissions on stocks and bonds, not property. A self-directed custodian lets you own real estate inside your retirement account instead.
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This surprises a lot of people, but the IRS has always allowed retirement accounts to own real estate. The law does not restrict your IRA to just stocks, bonds and mutual funds or ETFs. Those limitations come from brokerages, not the tax code. Because see, they don't get a commission when you go out and buy real estate. They want to manage a brokerage account. But when you go buy alternative assets, their brokerage may not function to provide a commission for their advisors. But when you self direct your account with a self directed custodian or trust company, you're simply choosing investment that Wall street doesn't sell. If someone says you can't, what they're really saying is they can't help you do it.