Can a GST trust prevent an inheritance from being depleted by taxes

Lloyd just received word that the codicil he signed last year – the one directing his beachfront property into a trust for his grandchildren – was deemed invalid due to a minor technicality. He’d assumed that document shielded his legacy from estate and gift taxes, but now that’s uncertain, and the potential tax bill could wipe out a significant portion of what he intended to leave behind. This is a tragically common scenario, and it underscores the critical need for meticulous planning and proactive trust administration.

The short answer is yes, a properly structured Generation-Skipping Transfer (GST) trust can significantly reduce or even eliminate taxes on inherited wealth, but it’s far from a “set it and forget it” solution. It requires ongoing attention, particularly given the ever-changing landscape of tax law. Many clients believe simply creating a trust is enough; they don’t realize the importance of active exemption planning and aligning the trust’s terms with current regulations.

The primary goal of a GST trust is to transfer assets to future generations—grandchildren, and even great-grandchildren—without incurring gift or estate tax at each generation. Without a GST trust, assets would be subject to estate tax when passed from you to your children, and again when passed from your children to your grandchildren. This “stacking” of estate tax can erode wealth substantially. A GST trust effectively “skips” the tax liability at the intermediate generation. However, merely designating a trust as a “GST trust” isn’t enough. There are specific allocation requirements and ongoing administrative duties.

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. Many clients mistakenly assume this exemption is automatic; it must be affirmatively elected. We frequently see situations where clients haven’t properly allocated their exemption, resulting in unexpected tax consequences.

What Happens if I Don’t Properly Fund the Trust?

A trust document is merely a blueprint. The assets must be actually transferred into the trust to receive the intended tax benefits. I’ve seen too many instances where clients intend to transfer real estate into a GST trust but die with the property still in their name. In those cases, particularly in California, the transfer will be subject to probate. For deaths on or after April 1, 2025, a home intended for the GST trust but left in the settlor’s name (valued up to $750,000) qualifies for a ‘Petition for Succession’ under AB 2016 (Probate Code § 13151). It’s crucial to understand this is a “Petition” (a court order), not a simple “Affidavit” as many assume. This process, while simpler than full probate, still involves court oversight and incurs costs.

How Does Prop 19 Affect GST Trusts?

California’s Prop 19 poses a significant challenge to GST trusts involving real estate. 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 effectively negate the tax benefits of the trust if the property tax burden becomes unsustainable. Careful consideration must be given to whether holding real estate within a GST trust is advantageous, given the potential property tax implications.

What About Business Assets Held Within the Trust?

Holding business interests, such as LLCs, within a GST trust requires attention to Beneficial Ownership Information (BOI) reporting requirements. 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. Failing to do so can result in substantial penalties.

Are Digital Assets Protected?

In today’s world, digital assets – cryptocurrency, online accounts, etc. – are an increasingly important part of an estate. 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. This can leave those assets inaccessible or subject to estate taxes if not properly addressed in the trust document.

What’s the Long-Term Viability of the Trust?

It’s essential to consider the long-term duration of the trust. Unlike ‘dynasty friendly’ states like South Dakota, 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 incorporate these clauses into our GST trust documents to maximize the potential benefits for future generations, but it’s crucial to understand the limitations imposed by California law.

After 35+ years of practice as both an Estate Planning Attorney and a CPA, I understand the nuanced interplay between tax law and estate planning. The CPA perspective is invaluable when structuring a GST trust. We can analyze the potential step-up in basis for assets transferred into the trust, assess capital gains implications, and develop valuation strategies to minimize tax liabilities. This combined expertise provides clients with a comprehensive and effective wealth transfer solution.

What determines whether a California trust settlement remains private or erupts into public litigation?

Success in trust administration depends on more than just the document; it requires active management of assets, precise accounting to beneficiaries, and careful navigation of tax rules. Whether dealing with a blended family or complex real estate, understanding the mechanics of trust law is the only way to ensure the grantor’s wishes survive scrutiny.

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

• Federal GST Tax Exemption: IRS Estate & GST Tax Guidelines
  Reflects the inflation-adjusted exemption effective January 1, 2026, which sets the GST Tax Exemption at approximately $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 unless the parents are deceased.
• 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)
  The Corporate Transparency Act applies to most GST trusts holding LLCs. Trustees must file a Beneficial Ownership Information (BOI) report for both domestic and foreign entities. Failure to report changes within 30 days can result in federal civil penalties of $500/day.