GRAT vs. Sale to an IDGT: Choosing the Right Freeze

Two of the strongest moves in estate planning chase the same goal. Each one pulls the future appreciation of an asset out of your estate, so it grows for your heirs instead of getting taxed when you die, and each does it while spending little or none of your lifetime exemption. Both freeze the value at today's number and let the upside run free. On paper they look nearly interchangeable.

In practice they aren't. A grantor retained annuity trust and a sale to an intentionally defective grantor trust behave differently in ways that decide whether the plan works at all, how much it moves, and which generation ends up with it. Choose between them well, or know when to run each, and you've got a freeze that quietly hands down a fortune. Choose badly and you waste the opening or point it at the wrong heirs.

What Both Structures Do

Start with what they share, since that's really the whole point. In each one you hand over an appreciating asset and, in return, you're owed a stream of payments back over the years. If the asset grows faster than a rate the tax code assumes it will, that extra growth belongs to your heirs, clear of gift and estate tax. You've kept the value you put in, collected through the payments, and given away only what the asset becomes later.

That's the freeze. Your estate stays pinned at today's value plus the return you take back, while everything above the assumed rate compounds outside your estate for the next generation. Drop a pre-liquidity stock, a concentrated position, or a business interest into one of these ahead of a fast-growth stretch, and the appreciation passes for next to nothing. Where the two structures split apart is the mechanics, how the payments and the hurdle actually work.