If you have an asset that you expect to explode in value—like pre-IPO startup stock or a rapidly growing business—you face a massive estate tax problem. If you hold it until you die, the IRS takes 40% of the appreciated value. If you gift it now, you use up your lifetime gift tax exemption. The solution is the Grantor Retained Annuity Trust (GRAT).
The Mechanics of a Zeroed-Out GRAT
You transfer the asset into an irrevocable trust for a set term (e.g., 2 years). The trust is required to pay you back an annuity equal to the initial value of the asset, plus a small IRS-mandated interest rate (the Section 7520 rate). Because you are getting back exactly what you put in (plus interest), the IRS considers the 'gift' to your heirs to be zero dollars.
Important
The Magic Trick
If the asset grows faster than the IRS hurdle rate, all of that excess growth stays in the trust and passes to your heirs completely tax-free when the term ends.
The Mortality Risk
The catch is that you must survive the term of the GRAT. If you set up a 10-year GRAT and die in year 9, the assets are pulled back into your taxable estate, and the strategy fails. This is why wealthy individuals often use 'rolling' 2-year GRATs to minimize mortality risk.