How does a GST trust work in California estate planning

I recently had a client, Randall, come to me in a panic. His father had meticulously crafted a Generation-Skipping Transfer (GST) trust years ago, intending to leave a substantial legacy to his grandchildren. Unfortunately, the original codicil, clearly outlining the trustee’s successor, had been misplaced during a move. Reconstructing that intent through probate was going to cost Randall’s family an estimated $35,000 in legal fees and delay the distribution of funds for at least a year—a heartbreaking situation stemming from a simple administrative oversight.

As an Estate Planning Attorney and CPA with over 35 years of experience here in Escondido, California, I’ve seen countless families benefit from – and occasionally struggle with – the nuances of GST trusts. They’re powerful tools, but require careful planning, and increasingly, proactive administration. Let’s break down how they work within the California context.

What is a Generation-Skipping Transfer Trust?

A GST trust is designed to transfer assets to grandchildren (or even further down the line, like great-grandchildren) without triggering estate tax at each generation. Normally, when you gift assets to your children, and they later pass those assets to their children, estate tax is potentially due at both the children’s death and the grandchildren’s inheritance. A GST trust bypasses that intermediate tax, effectively allowing you to transfer wealth across generations with a single layer of taxation.

How Do You Fund a GST Trust?

Funding a GST trust involves transferring assets – cash, stocks, real estate, business interests – into the trust during your lifetime, or through your estate plan at death. The key is a properly drafted trust document that explicitly designates the trust as a GST trust, and a conscious allocation of your GST tax exemption. Currently, for 2025, the federal estate and gift tax exemption is high, but that is scheduled to revert to around $5 million per person in 2026. However, effective Jan 1, 2026, the OBBBA (One Big Beautiful Bill Act) permanently set the Federal Generation-Skipping Transfer (GST) Tax Exemption to $15 million per person; failing to allocate this exemption on Form 709 exposes the trust to a flat 40% tax on every distribution to grandchildren.

As a CPA, I emphasize that proper valuation is crucial when gifting appreciated assets. The “step-up” in basis at death can significantly reduce capital gains taxes for your heirs, but that benefit is lost if assets are gifted into the GST trust during your lifetime. Careful planning with a qualified financial professional is essential.

What are the Limitations in California?

California, unlike some “dynasty friendly” states, isn’t always the easiest place to establish a long-term GST trust. Unlike those states, California is bound by the Uniform Statutory Rule Against Perpetuities (USRAP), which generally limits the trust’s lifespan to 90 years unless specific savings clauses are used. We meticulously draft these clauses to extend the trust’s duration to the maximum extent permitted by law, but clients must understand this limitation.

What Happens with Real Estate Held in a GST Trust?

This is a particularly tricky area in California, thanks to Prop 19. Under Prop 19, transferring a home to grandchildren via a GST Trust almost always triggers a property tax reassessment to current market value, as the ‘grandparent-grandchild’ exclusion is severely restricted compared to the old Prop 58 rules. This can significantly impact the overall benefit of the trust, so we often advise clients to consider alternative ownership structures for real estate intended for future generations.

However, if the settlor dies with a home intended for the GST trust still in their name (valued up to $750,000), for deaths on or after April 1, 2025, a ‘Petition for Succession’ under AB 2016 (Probate Code § 13151) can be used. This is a Petition (Judge’s Order), NOT an “Affidavit” – a critical distinction.

What About Business Interests?

GST trusts can hold ownership of Limited Liability Companies (LLCs). The FinCEN 2025 Exemption states that while domestic U.S. LLCs held in the trust are exempt from BOI reporting as of March 2025, trustees managing foreign-registered entities must still file updates with FinCEN within 30 days to avoid federal fines.

Protecting Digital Assets in a GST Trust

In today’s digital world, it’s essential to address the issue of digital assets – cryptocurrency, online accounts, intellectual property. Without specific RUFADAA language (Probate Code § 870) in the GST Trust, service providers can legally block your trustee from accessing crypto wallets or cloud accounts intended for future generations. We routinely incorporate this language into our trust documents to ensure seamless access to these vital assets.

What failures trigger court intervention and contests in California trust administration?

California trusts are designed to bypass probate and maintain privacy, yet they often fail when assets are not properly funded, trustee duties are ignored, or ambiguous terms trigger disputes. Even with a signed trust document, families can face court battles if the “operations manual” of the trust isn’t followed strictly under the Probate Code.

Ultimately, the success of a trust depends on the details—proper funding, clear terms, and a trustee willing to follow the rules. By anticipating friction points and documenting every step of the administration, fiduciaries can protect the estate and themselves from liability.

Verified Authority on California Generation-Skipping Trust (GST) Administration

• GST Tax Exemption (OBBBA): IRS Estate & GST Tax Guidelines
  Reflects the OBBBA update effective January 1, 2026, which sets the GST Tax Exemption at $15 million per person. Proper allocation of this exemption is the only way to shield trust assets from the flat 40% tax on distributions to grandchildren.
• Trust Duration Limits (USRAP): California Probate Code § 21205 (90-Year Rule)
  California follows the Uniform Statutory Rule Against Perpetuities. This statute generally limits a Generation-Skipping Trust’s validity to 90 years, preventing “forever” trusts common in other jurisdictions.
• Property Tax Reassessment (Prop 19): California State Board of Equalization (Prop 19)
  Critical for GST planning. Prop 19 severely limits the “grandparent-grandchild” exclusion, meaning most real estate transfers to grandchildren will trigger a property tax increase to current market value.
• Primary Residence Succession (AB 2016): California Probate Code § 13151 (Petition for Succession)
  If a home intended for the GST trust was accidentally left out, this statute (effective April 1, 2025) allows a “Petition for Succession” for residences valued up to $750,000, avoiding a full probate.
• Digital Legacy (RUFADAA): California Probate Code § 870 (RUFADAA)
  The authoritative statute for digital assets. Without specific RUFADAA provisions in the trust, multi-generational access to cryptocurrency and digital files can be legally denied by custodians.
• Business Compliance (FinCEN): FinCEN – Beneficial Ownership Information (BOI)
  As of March 2025, domestic U.S. LLCs are exempt from mandatory BOI reporting. However, trustees managing foreign-registered entities must still comply with strict reporting windows to avoid penalties of $500/day.