Blog · 16 October 2026

GST Tax and Grandfathered Trust Division: PLR 202641001 Guide for US CPA Firms

By Keshav Bansal, CA

GST tax (generation-skipping transfer tax under Chapter 13) is a second transfer tax when wealth skips a generation. Bloomberg Tax (October 13, 2026) reported that PLR 202641001 held that dividing an irrevocable grandfathered GST-exempt trust into three equal separate trusts for different great-grandchildren retains GST tax-exempt status, creates no taxable income or gift tax, preserves carryover basis and holding periods, and gives each resulting trust separate taxpayer status. For US CPA firms advising multi-generation trusts, the ruling is a concrete walkthrough of Treas. Reg. §26.2601-1(b)(4) safe modifications.

What PLR 202641001 held

Primary source: PLR 202641001 (letter dated July 13, 2026; released October 9, 2026; PLR-100672-26; CC:PT&E:B04). The trust was established for Child and Child’s issue, became irrevocable before September 25, 1985, and received no actual or constructive additions after that date. After Child’s death, Grandchild and three living Great-grandchildren remained. The trustee proposed dividing the trust into three equal-value Resulting Trusts—each primarily for Grandchild, one Great-grandchild, and that Great-grandchild’s issue—with identical terms otherwise, funded pro rata under a State statute allowing division after notice to qualified beneficiaries.

The IRS granted five rulings, conditioned on the division being valid under State law and on the facts represented:

1. The Proposed Division will not cause Trust or Resulting Trusts to lose grandfathered GST status or otherwise become subject to GST tax.
2. No recognition of income, gain, or loss under §§61, 661, 662, or 1001 to Trust, Resulting Trusts, or any beneficiary.
3. No transfer subject to gift tax under §2501.
4. Adjusted basis and holding periods of Resulting Trust assets stay the same as Trust’s immediately before the division under §§1015 and 1223(2).
5. Resulting Trusts are separate trusts and separate taxpayers for federal income tax purposes under §643 (taxpayer represented no contributions after March 1, 1984, so §643(f) aggregation did not apply).

Under §6110(k)(3), the ruling may not be used or cited as precedent—the same limit noted in our guides on estate tax portability / PLR 202641004 and 9100 relief / PLR 202641003.

How generation-skipping transfer tax works

Section 2601 imposes a tax on every generation-skipping transfer. Under §2611(a), that means a taxable distribution, a taxable termination, or a direct skip. Chapter 13 generally applies to transfers after October 22, 1986 (Tax Reform Act of 1986 §1433(a); Treas. Reg. §26.2601-1(a)). The top rate for generation-skipping transfers is 40%, as noted in Form 709 instructions and our 2026 gift tax annual exclusion guide.

Each transferor has a GST exemption equal to the basic exclusion amount. Rev. Proc. 2025-32 §3.14 (via Pub. L. 119-21 §70106) sets that amount at $15,000,000 for 2026, with inflation adjustment from 2027—the same figure used for the gift/estate basic exclusion. Allocating exemption to a trust can drive its inclusion ratio to zero so later skip transfers from that trust are not taxed under Chapter 13. That planning tool is separate from grandfathered exemption: some trusts never needed an allocation because they predate the modern GST regime.

Grandfathered trusts irrevocable on September 25, 1985

Under Treas. Reg. §26.2601-1(b)(1)(i) and Act §1433(b)(2)(A), Chapter 13 does not apply to a generation-skipping transfer under a trust that was irrevocable on September 25, 1985—except to the extent transfers are made out of corpus added after that date (or income attributable to such additions). Post–September 25, 1985 additions create a chapter 13 portion with its own inclusion ratio; appreciation and undistributed income on the original corpus are generally not treated as additions (§26.2601-1(b)(1)(vi)).

That grandfathered status is fragile. Additions, constructive additions, or modifications that shift beneficial interests to a lower generation or stretch vesting beyond the original period can put the trust—or a slice of it—into Chapter 13. PLR 202641001 stayed on the safe side: irrevocable before the cutoff, no additions, and a same-generation parallel-trust split.

Treas. Reg. §26.2601-1(b)(4): safe modifications

Section 26.2601-1(b)(4) tells when a modification, judicial construction, settlement, or trustee action will not cause an exempt trust to lose GST-exempt status. Those rules are for GST status only; the regulation itself warns they do not decide gift tax, estate inclusion, or §1001 gain unless specifically noted—which is why PLR 202641001 also ruled separately on income and gift tax.

Under §26.2601-1(b)(4)(i)(D), a modification valid under state law (judicial or nonjudicial) keeps exempt status if it does not (1) shift a beneficial interest to a beneficiary in a lower generation under §2651 than the persons who held the interest before, and (2) extend the time for vesting of any beneficial interest beyond the period in the original trust. A shift includes a change that can increase the amount of a GST transfer or create a new one. Administrative changes that only indirectly raise the amount transferred (for example, by cutting costs) are not treated as shifts.

Example 5 in §26.2601-1(b)(4)(i)(E) is the textbook parallel: a 1980 irrevocable trust for two children and their issue is divided by court order into two equal trusts along family lines, without extending vesting. The regulation concludes the partitioned trusts remain outside Chapter 13. PLR 202641001 expressly followed that example for a three-way split among great-grandchildren, with each Resulting Trust also preserving the same beneficial interests Settlor’s other issue had under the original trust.

Why the income, gift, basis, and separate-taxpayer holdings matter

GST status is only half the file. The IRS also concluded a pro rata equal-value funding was not a sale or exchange under §§61/1001 (citing Rev. Rul. 69-486 and Rev. Rul. 56-437), was not a gift under §2501 because beneficial interests were the same before and after, carried over basis and holding periods under §§1015 and 1223(2), and produced three separate §643 taxpayers (no contributions after March 1, 1984). Non-pro rata funding or a generation shift would put those conclusions at risk even if the GST safe harbor still seemed to apply.

Preparer checklist for grandfathered trust divisions

• Confirm grandfathering — irrevocable on September 25, 1985; document any post-cutoff additions or constructive additions and the resulting chapter 13 portion.
• Map generations — verify the modification does not move beneficial interests to a lower §2651 generation or extend vesting past the original instrument.
• Match Example 5 / PLR facts — parallel trusts for same-generation lines, pro rata equal value, identical dispositive terms aside from the named primary branch.
• State-law authority — statute or court order authorizing the division; notice to qualified beneficiaries as required.
• Separate income/gift analysis — do not assume the GST modification rules settle §1001 or §2501; document pro rata, equal interests.
• EINs and filing — Resulting Trusts as separate taxpayers need their own returns and basis/holding-period tracking.
• PLR limits — a private letter ruling binds only that taxpayer; §6110(k)(3) bars citing it as precedent.

Where Tax Brew fits

Grandfathered GST trusts show up in estate and gift workpapers long after the settlor is gone. Tax Brew provides bookkeeping, cleanup and tax prep support for US CPA firms, including trust-division workpapers, basis schedules and Form 1041 support your reviewers can rely on, with the first 20 hours free for qualifying engagements. Your firm keeps the advice and the sign-off. See our services, or email info@taxbrewglobal.com.

Sources: PLR 202641001 (dated July 13, 2026; released Oct. 9, 2026); Bloomberg Tax (Oct. 13, 2026), IRS Issues PLR Holding Division of Grandfathered Trust Retains GST Exemption; Treas. Reg. §26.2601-1 (Cornell LII); 26 U.S.C. §2601, §2611 (Cornell LII); Rev. Proc. 2025-32 §3.14 / Pub. L. 119-21 §70106 (2026 GST exemption $15,000,000, as cited in our gift tax annual exclusion guide). General information, not tax or legal advice.