Generation-Skipping Trust Administration in California

Generation-Skipping Trust Administration in California

If you’re a trustee of a trust that names grandchildren, great-grandchildren, or anyone more than one generation below the person who created it, you’re running a generation-skipping trust, and the federal government has a separate tax regime waiting for you: exemption tracking, an inclusion ratio, and specific tax forms every time money moves out to a skip person. Missing any of it doesn’t surface right away. It surfaces years later, usually during an IRS audit or when a beneficiary’s own attorney flags the problem.

What makes a trust “generation-skipping”

A generation-skipping transfer happens when property moves to a “skip person,” someone assigned to a generation at least two levels below the transferor. Grandchildren are the classic example. So are unrelated beneficiaries more than 37.5 years younger than the grantor.

The federal GST tax exists because, without it, a family could set up a trust for grandchildren and never pay estate tax at the parent’s generation. The government closes that gap with a separate transfer tax, layered on top of any gift or estate tax already due.

GST tax exemption and allocation

Every individual has a GST exemption amount, which moves in step with the federal estate tax exemption. Under Internal Revenue Code § 2632, this exemption can be allocated to transfers into the trust, either automatically or by affirmative election on a gift or estate tax return.

If the exemption is allocated properly and fully covers the transfer, the trust becomes “GST exempt,” meaning distributions and terminations from it won’t trigger GST tax down the line. If the exemption is only partially allocated, the trust has an “inclusion ratio” somewhere between zero and one, and every taxable distribution gets taxed proportionally.

This allocation decision usually happens when the trust is funded, often through the grantor’s estate plan or at the time of a taxable gift. But the trustee inherits the consequences. A trustee administering a GST trust needs to know whether exemption was allocated and how much, the trust’s inclusion ratio, and whether any subsequent contributions require new allocation decisions. If this wasn’t documented correctly at funding, the trustee may need to work with the estate’s accountant or attorney to reconstruct it before making any distributions.

Trustee duties specific to GST trusts

Tracking taxable distributions and terminations

Two events trigger GST tax exposure during administration: a taxable distribution, money or property going out to a skip person, and a taxable termination, the trust’s interest passing to a skip person, often when an older beneficiary dies or a trust period ends.

For a taxable distribution, the beneficiary who receives it is generally responsible for the tax, but the trustee must file Form 706-GS(D-1) reporting the distribution and provide the recipient the information needed to compute the tax. For a taxable termination, the trustee is directly responsible for the tax and must file Form 706-GS(T). Missing these filings, or filing them late, creates penalty exposure that falls on the trust and can expose the trustee to a surcharge claim from beneficiaries under Probate Code § 16420 if the error causes a loss.

Coordinating with the trust’s accountant

Because GST calculations depend on the inclusion ratio, the original exemption allocation, and any additional contributions, this isn’t work a trustee should attempt without a CPA who has handled GST returns before. Ridley Law works alongside the accountants on these matters rather than trying to do tax math in-house, and any trustee administering a GST trust should insist on the same division of labor.

Reporting to beneficiaries

California’s trust accounting rules under Probate Code §§ 16060-16063 apply to GST trusts the same as any other trust. Beneficiaries, including the skip persons who are the ultimate targets of the trust, generally have a right to information about how the trust is administered and how their interests are affected. A trustee who treats the GST tax mechanics as a reason to withhold information from current beneficiaries is inviting a Probate Code § 17200 petition.

Investment and distribution standards

GST trusts are still trusts, which means the trustee owes the ordinary duties of loyalty, impartiality, and prudent administration under the Probate Code, on top of the tax-specific obligations. A trustee can’t let GST tax planning override the duty to treat income and remainder beneficiaries fairly, or the duty to invest prudently under the Uniform Prudent Investor Act as adopted in Probate Code § 16047.

The GST trustee’s compliance cycle

What happens when the trustee gets it wrong

Errors in GST administration tend to surface years after the fact, often when the IRS audits a distribution or when a beneficiary’s own estate planning attorney flags an inclusion ratio problem. By then, correcting the error can mean amended returns, penalties, and interest that may come out of trust assets, or out of the trustee’s own pocket if the trustee breached a duty in the process.

Handling additional contributions to an existing GST trust

GST trusts don’t always stop receiving assets after the initial funding. A grantor might make additional gifts into the trust in later years, or a formula clause in a will might pour more assets in at a second death. Each new contribution needs its own exemption allocation decision, and the trust’s overall inclusion ratio has to be recalculated to reflect the blended result. A trustee who assumes the original inclusion ratio still applies after a new contribution, without checking whether exemption was allocated to that specific transfer, can end up with a trust that’s only partially exempt without realizing it until a distribution triggers an unexpected tax bill.

Multi-generation trusts and dynasty planning

Some GST trusts are drafted to last for decades, sometimes structured as dynasty trusts intended to benefit multiple future generations under California’s extended rule against perpetuities. A trustee administering one of these isn’t managing a transaction with a defined end date; they’re managing an institution that may outlast their own tenure as trustee. That reality changes how record-keeping should work. Exemption allocation records, the inclusion ratio calculation, and every GST tax filing need to be preserved in a way that a successor trustee, possibly decades from now, can pick up and understand without reconstructing the trust’s tax history from scratch.

Working with the trust’s investment strategy

Because GST trusts often span multiple generations of beneficiaries with different needs and time horizons, the trustee’s investment strategy has to account for that spread. A trust holding assets for a grandchild who is a minor today, but who may not receive principal for decades, has a different risk tolerance than a trust making current income distributions. The Uniform Prudent Investor Act gives trustees flexibility to invest for the trust as a whole rather than asset by asset, but that flexibility comes with the expectation that the trustee actually documents why a given strategy fits the trust’s time horizon and beneficiary mix.

The honest caveat

Building GST tax review into the trust’s regular administration cycle from day one, confirming the exemption allocation at funding, tracking the inclusion ratio, filing the correct forms every time a distribution or termination occurs, is the only reliable way to avoid this. A trustee who waits until a distribution is already requested to figure out the tax consequences is working backward from a problem instead of ahead of one.

Talk to a real California estate attorney

Generation-skipping trusts require a trustee who understands both the tax mechanics and the fiduciary duties layered on top of them. I work alongside tax professionals on these matters and can help you confirm where your trust actually stands.

Talk to Eric Ridley is a free 60-minute consultation by phone or Zoom, anywhere in California. Or call (805) 244-5291.

Related reading: The successor trustee’s role · The trustee’s duty to inform and account · The complete guide to trust administration in California

Frequently asked questions

What makes a trust a generation-skipping trust?

Property is set to move to a skip person, someone at least two generations below the trust’s creator, most commonly a grandchild. A separate federal GST tax applies on top of any gift or estate tax.

What is the GST inclusion ratio and why does it matter to a trustee?

It measures how much of the trust is exposed to GST tax based on the exemption allocated at funding. Zero means fully exempt; between zero and one means proportional tax on distributions.

What tax forms does a GST trustee have to file?

Form 706-GS(D-1) for taxable distributions and Form 706-GS(T) for taxable terminations, where the trustee is directly responsible for the tax.

Can a trustee administer a GST trust without a CPA?

Not advisable. The calculations are complex enough that most trustees work with a CPA experienced in GST returns to avoid penalty and surcharge exposure.

This is general information about California law, not legal advice for your situation.