What it means
A GRAT works by splitting an asset into two pieces: the annuity stream the grantor keeps, and the remainder the beneficiaries get at the end. The taxable gift is only the remainder, valued at the outset using a prescribed discount rate, so if the annuity is set high enough the calculated gift can be pushed close to zero.
That prescribed rate is the point of the whole structure. Tax rules assume the assets will grow at a set benchmark rate, so only growth above that benchmark ends up with the beneficiaries free of additional gift tax.
The structure suits assets expected to appreciate sharply or unevenly, such as shares in a private company before a sale, or a concentrated stock position after a strong run. It works poorly for slow, steady assets, because if growth merely matches the benchmark rate there is nothing left over to pass on.
Short terms are common precisely because of the main risk. If the grantor dies during the trust term, most or all of the assets are pulled back into their taxable estate, so a two-year or three-year GRAT limits that exposure and can be repeated in a rolling series.
The downside is modest but real: the costs of setting up and administering the trust are wasted if the assets underperform. Nothing is lost beyond fees, because the annuity payments simply return the original value to the grantor, which is why practitioners often describe a GRAT as a low-risk bet on growth.
GRATs are a United States estate tax planning tool and depend on rules that change from time to time. Anyone considering one needs current professional advice rather than a general description, since the value of the technique moves with the benchmark rate and with the legislative mood.
In practice
Real-world examples.
Example
A software founder expecting an acquisition places $5,000,000 of her shares into a three-year GRAT. The deal closes 14 months later at a large premium, and the excess above the benchmark rate, several million dollars, passes to her children without using her lifetime exemption.
Example
A property developer sets up a rolling series of two-year GRATs, funding a new one each January with a slice of his listed share portfolio. Some vintages produce nothing because markets are flat, while the two funded before strong years transfer meaningful value, and his total downside across all of them is the annual legal and accounting cost.
Example
A 71-year-old business owner considers a ten-year GRAT to maximise the growth window, but her adviser models the mortality risk and recommends three-year terms instead. The shorter structure sharply reduces the chance that she dies mid-term and the assets are dragged back into her estate.
Formula
Calculation
The taxable gift is calculated as:
Taxable gift = Value of assets transferred - Present value of retained annuity
Present value of annuity = Annual payment x Annuity factor, where the annuity factor for n years at rate r is the sum of 1 / (1 + r) raised to each year from 1 to n.
Suppose a founder transfers $1,000,000 of private company shares into a two-year GRAT when the prescribed rate is 5%.
Annuity factor = 1 / 1.05 + 1 / 1.05 squared = 0.952381 + 0.907029 = 1.859410
To zero out the gift, the annual payment is set at $1,000,000 / 1.859410 = $537,804.88
Present value of the annuity = $537,804.88 x 1.859410 = $1,000,000, so the taxable gift is $1,000,000 - $1,000,000 = $0.
Now assume the shares actually grow at 12% a year.
Year 1: $1,000,000 x 1.12 = $1,120,000, less the $537,804.88 payment leaves $582,195.12
Year 2: $582,195.12 x 1.12 = $652,058.53, less the $537,804.88 payment leaves $114,253.65
The beneficiaries receive $114,253.65 free of additional gift tax, because the gift was valued at zero at the start. Had the shares grown at only 5%, the trust would have ended with nothing left over and the exercise would have cost only the professional fees.Case study
Seen in the real world.
This illustrative and fictional example concerns Pallow Robotics, a privately held automation business. Its founder held shares independently valued at $1,000,000 and believed a trade sale within two years could multiply that figure, so she funded a two-year zeroed-out GRAT when the prescribed rate stood at 5%, retaining an annual annuity of $537,804.88.
The company grew strongly and the shares appreciated at roughly 12% a year during the term. After both annuity payments were made in full, $114,253.65 of value remained in the trust and passed to her two children, with a reported taxable gift of zero. Her total cost was about $18,000 in legal and valuation fees.
The illustrative moral is one of proportion. The technique did not create wealth, it simply redirected the growth above a benchmark, and the founder's downside had always been limited to fees rather than to the underlying assets.
Watch out
Common mistakes.
- Funding a GRAT with slow-growing or income-only assets, where returns rarely beat the benchmark rate and the structure delivers nothing beyond professional fees.
- Choosing a long term to capture more growth, which greatly increases the risk that the grantor dies during the term and the assets return to the taxable estate.
- Treating the annuity payments as optional, when missing or underpaying them can invalidate the structure and expose the entire transfer to gift tax.
Questions
People also ask.
What happens if the grantor dies during the GRAT term?
Some or all of the trust assets are included in the grantor's taxable estate, largely undoing the planning benefit, though the family is generally no worse off than if nothing had been done.
Can the annuity be paid in shares rather than cash?
Yes, illiquid trusts often pay in kind by transferring shares back to the grantor at their then value, which is common where the underlying asset produces little cash.
Is a GRAT the same as a grantor trust?
A GRAT is one specific type of grantor trust; the grantor pays income tax on the trust's earnings, which adds a further, usually welcome, transfer of value to the beneficiaries.
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