As wealth transfer planning becomes increasingly important for high-net-worth individuals and families, many seek strategies that can reduce future estate tax exposure without sacrificing current income. Two commonly used techniques—Grantor Retained Annuity Trusts (GRATs) and Private Annuity Sales to an Intentionally Defective Grantor Trust (IDGT)—offer ways to transfer appreciating assets out of a taxable estate while continuing to receive a stream of payments.
Although both strategies share the goal of shifting future growth to beneficiaries in a tax-efficient manner, they operate very differently and carry distinct benefits, risks, and planning considerations. Understanding how each approach works can help families determine which strategy best aligns with their liquidity needs, estate planning objectives, and tolerance for mortality and investment risk.
This three-part blog series offers a high-level, practice-oriented comparison for financially sophisticated readers. It is not legal, tax, or valuation advice. Outcomes are fact- and jurisdiction-specific and require coordinated professional guidance.
The Core Mechanics
How a GRAT shifts value
A GRAT is an irrevocable trust to which the grantor contributes appreciating assets and retains a fixed annuity for a set term. The annuity is actuarially priced using a required interest rate (obtained from Internal Revenue Code (the “Code”) Section 7520) set at the time of the GRAT’s creation. If the GRAT’s asset growth exceeds the Code Section 7520 “hurdle” (after fees and annuity payouts), the excess remainder passes to the GRAT’s remainder beneficiaries (often descendants or a generation-skipping transfer [“GST”] tax-exempt trust) without being subjected to the forty percent gift tax. This way, a large amount of assets end up with one’s family members (beneficiaries) with no gift tax risk at the end of the retained annuity term.
For example, if you place assets into a GRAT worth $10 million, but you retain an annuity stream for ten years, the present value of which is about $10 million, you avoid all gift taxes. Then, assume the assets you initially placed into the GRAT grow in value so that after you receive the approximate $10 million in annuity payments, there is still another $10 million remaining in the GRAT to be distributed among your beneficiaries, which remains free from gift taxes.
Role of the Code Section 7520 rate in a GRAT
The Code Section 7520 rate sets the present value of the grantor’s retained annuity. A lower rate makes it easier for asset performance to clear the hurdle and push value to the remaining beneficiaries. A “zeroed-out” GRAT targets a minimal taxable gift by sizing the annuity so the actuarial remainder value is close to zero, relying on performance above the hurdle to produce the eventual transfer. If you gift a discountable asset (such as an LLC interest) into the GRAT, the annuity is based solely on the discounted value of the LLC interest (twenty percent or greater discounts are common).
For example, if the LLC owns assets with a six percent rate of return (income and growth), but the LLC interest was discounted by twenty percent, this means that six percent (of the value of the gifted LLC interest) annuity payments only need to be 4.8% of the earnings and income of the LLC assets. Therefore, if the gifted LLC interest earns enough to pay $1,000 per month to the GRAT (at its six percent rate of return), only $800 of that needs to be paid out as an annuity payment (since the annuity payment is determined after the 20% discount is applied to the value of the LLC interest; hence eighty percent of the value of the LLC’s underlying assets). This makes it easier for the GRAT to grow in value.
How a private annuity sale to an IDGT moves value
In a sale to an IDGT for a private annuity, the grantor sells discountable assets (e.g., a non-controlling, non-marketable LLC interest) to the IDGT in exchange for the IDGT’s unsecured promise to pay an annuity for the grantor’s lifetime. The annuity amount is priced using actuarial life expectancy and an assumed discount rate.
Because the buyer is a grantor trust, sales and annuity payments are generally disregarded for income tax between the grantor and the IDGT while the grantor trust status lasts. The IDGT bears longevity and investment risk, meaning that the longer you live, the more the IDGT must pay out to you. Regardless of how long you live, upon your death, the entire value of the annuity is not included in your taxable estate (because it is worth zero upon your death).
Therefore, while you retained a healthy cash flow for your entire life, nothing related thereto is included in your taxable estate. The IDGT, however, must have owned sufficient assets (determined at the time of the sale) or had a guarantor to cover any shortage, to meet the assumption that the IDGT could have maintained the annuity payment obligations to you had you lived to be 110 years old (commonly known as the “exhaustion test”).
