Executive summary

Dynasty trusts remain the most durable way to separate control and beneficial enjoyment, to hard wire creditor and divorce protection, and to compound capital outside transfer tax systems for several generations. The federal landscape shifted again in 2025. For calendar year 2025 the basic exclusion amount for estate and gift tax is 13.99 million per individual and the annual gift tax exclusion is 19,000 per donee. Congress then enacted the One Big Beautiful Bill Act in July 2025, which sets the basic exclusion at 15 million beginning in 2026 with future inflation indexing. This removes the uncertainty that the exemption would automatically fall by half at the end of 2025. The rate remains 40 percent. Practitioners should recalibrate designs for both lifetime and testamentary transfers, with special attention to basis management after the Service’s 2023 ruling on step up for grantor trusts. Tax News+2IRS+2

On the income tax side the step up in basis rule under section 1014 is intact. The Service confirmed in Revenue Ruling 2023 2 that assets in an irrevocable grantor trust that are not includible in the grantor’s gross estate do not receive a basis adjustment at the grantor’s death. Basis consistency and reporting rules under section 1014 f and section 6035 continue to constrain mismatches between estate tax value and income tax basis for property reported on an estate return that is required to be filed. These points together make basis engineering essential in dynasty trust drafting and administration. IRS+2eCFR+2

What follows is a deep dive written for attorneys who draft, fund, and administer long duration trusts. The focus is wealth propagation with an eye on estate tax, generation skipping transfer tax, income tax basis, and the practical levers that allow a family to retain optionality as laws and facts change.

I. Federal transfer taxes in 2025 and what changes in 2026

Current thresholds. For 2025 the basic exclusion is 13.99 million per person and the annual gift tax exclusion is 19,000 per donee. Spouses can continue to elect portability of a deceased spouse’s unused exclusion. The top federal rate is 40 percent. Tax News+1

From 2026 forward. The One Big Beautiful Bill Act fixes the basic exclusion at 15 million starting January 1, 2026 and indexes it thereafter. That figure applies for estate, gift, and GST purposes. The Act did not repeal portability or the 40 percent rate. Plan designs that assumed a hard drop at the end of 2025 should be revisited. Congress.gov

No clawback of prior gifts. The anti clawback regulations remain in effect. A decedent who used higher exclusion during life is not penalized if the exclusion is lower at death. This is a foundational assurance when encouraging clients to use exemption during life. IRS+1

II. Why dynasty trusts still dominate

A dynasty trust locks in creditor protection, family governance, and multigenerational GST shelter. Modern trust jurisdictions permit very long or perpetual duration and often offer directed trustee statutes, decanting flexibility, trust protector roles, and favorable income tax treatment.

Duration.

• South Dakota abolished the rule against perpetuities for most trust property. Pierce Atwood

• Delaware and Alaska permit perpetual or very long duration trusts with flexible modification tools. Forbes+1

• Nevada allows trusts to last up to 365 years and adds strong creditor protection. Sikich

Situs selection. Selecting situs in a no income tax trust jurisdiction can reduce drag on compounding when the trust will accumulate income for decades. This interacts with state source rules and fiduciary residency, so documents should empower trustees to change situs and governing law if family circumstances or statutes change.

III. Step up in basis after 2023 and why it drives design

What still steps up. Section 1014 continues to adjust basis of property acquired from a decedent to fair market value at death. Basis must be consistent with the estate tax value when a return is required. Legal Information Institute+1

What does not step up. Revenue Ruling 2023 2 states that assets held in an irrevocable grantor trust that are not includible in the grantor’s gross estate do not receive a basis adjustment at the grantor’s death. This confirms that completed gift grantor trusts that are excluded from the estate will often carry low basis forward. IRS

The one year rule. Do not try to pass appreciated property through a terminal person only to have it return to the original donor. Section 1014 e denies a basis increase if the appreciated property was gifted to the decedent within one year and comes back to the donor or the donor’s spouse. Planners can sometimes route assets to a different beneficiary to avoid the bar, but the facts must be examined with care. Legal Information Institute+1

Practical drafting responses.

• Include a power of substitution under section 675 4 C so the grantor can swap low basis trust assets for high basis assets or cash before death. Revenue Ruling 2008 22 and related guidance explain how to avoid estate inclusion while keeping this swap power. Document fiduciary safeguards and valuation procedures to keep the swap power respected. ILS Webinar Materials

• Use formula or toggled general powers of appointment. An independent person can be granted authority to confer a general power of appointment over selected assets to absorb the decedent’s remaining exclusion amount. That brings only the targeted assets into the estate to secure basis increase while keeping the overall estate tax neutral.

• Consider upstream planning. A child can contribute assets to a trust designed to cause inclusion in a parent’s estate if the parent has a modest taxable estate. This can capture a basis increase without transfer tax cost. The one year rule and local creditor rules must be respected.

• In community property states spouses often receive a basis adjustment on both halves of community assets at the first death. In separate property states a joint exempt step up trust can sometimes approximate the result. Drafting and state law risk vary, so treat this as a situational tool.

Administrative responses.

• Keep robust records for basis consistency reporting under section 6035 and Form 8971 when an estate return is required. Beneficiaries cannot claim basis above the reported value. Justia

• Build a valuation and swap calendar for aging clients with grantor trusts. The goal is to substitute low basis trust assets out of completed gift grantor trusts well before death.

IV. Lifetime dynasty trusts for married clients and for single wealth creators

Spousal lifetime access trusts. A SLAT allows one spouse to fund an irrevocable, typically grantor, trust for the other spouse and descendants. This uses exclusion, removes appreciation from the taxable estate, and keeps indirect access through the beneficiary spouse. Avoid reciprocal trust issues by separating timing, trustees, beneficial terms, and funding sources. The basis lesson from 2023 is that low basis assets left in a completed gift grantor SLAT will not receive a basis increase at the grantor’s death, so add swap powers and consider later inclusion techniques when exclusion is available.

Sales to intentionally defective grantor trusts. The classical sale to an IDGT swaps a seed gift and a note for appreciating assets. Income tax is ignored between the grantor and the trust. The sale freezes value and shifts future appreciation out of the estate. After 2023 this technique requires a basis plan because trust assets excluded from the estate will not step up at death. Swap powers, upstream options, and late stage toggles are essential. IRS

GRATs. A GRAT transfers only the remainder interest as a gift, valued using the section 7520 rate. Zeroed out short term rolling GRATs remain workhorses when a family wants to move upside with minimal exclusion use. Mortality and reinvestment risk remain the tradeoffs. GRATs are authorized under section 2702 and the Walton case allows near zero gifts when structured carefully. A rising section 7520 rate favors GRATs over lead trusts in some interest environments. For reference the section 7520 rate for October 2025 is 4.60 percent. Tax Law Center+2Cushing & Dolan, P.C.+2

Preferred partnership freezes and FLPs. Section 2701 governs preferred partnership freezes and section 2704 polices lapsing rights and certain restrictions. Freezes can deliver powerful valuation outcomes but are technically demanding, and recent cases continue to pull assets back into estates under section 2036 when formalities and non tax purposes are weak. Careful drafting, real business purposes, and clean administration matter more than ever. Legal Information Institute+2Legal Information Institute+2

QPRTs for residences. With higher section 7520 rates, QPRTs can again be attractive for primary and vacation homes, especially for clients with long life expectancy and strong desire to keep the property in the family. Remember that if the grantor dies during the term the property is pulled back into the estate, which restores a basis increase but sacrifices the transfer tax benefit. Schwab Brokerage+1

Domestic asset protection trust structures. In appropriate jurisdictions a self settled spendthrift trust can be combined with dynasty features for future gift funding or as a hybrid DAPT that initially benefits only a spouse and descendants with a protector hold back power to add the settlor later. Creditor law and public policy limits vary by state and by timing of transfers. Situs, solvency, and clear non fraudulent purposes are essential. Asset Protection Planners+1

State income tax reduction with ING trusts. Incomplete gift non grantor trusts established in favorable jurisdictions are still used to shift investment income and capital gain away from a high tax home state. They are complex. They require precise balance between avoiding grantor trust status and retaining enough power to keep the funding transfer incomplete. State conformity and sourcing rules differ widely. Baker Tilly+1

V. Testamentary structures that seed or continue dynasty trusts

Marital and bypass design. Many families still benefit from a marital trust plus a family bypass trust, each drafted with dynasty provisions and GST allocation. The surviving spouse can receive income and principal under a HEMS standard in the bypass trust and can enjoy full income and principal from a QTIP, with the QTIP remainder GST exempted through reverse QTIP election where appropriate.

Portability remains helpful but is no substitute for a trust. Portability preserves unused exclusion for the survivor but does not shelter growth outside the survivor’s estate, does not multiply GST exemption, and can be lost through remarriage risks. The Service allows a simplified late portability election window in many cases, which is a useful backstop, yet practitioners should not rely on portability alone when creditor protection and GST shelter are core goals. IRS

Formula powers for basis. Consider adding an independent person who can grant a general power of appointment over selected assets near death to soak up the decedent’s remaining exclusion and capture a basis increase while avoiding estate tax.

Charitable overlays. Testamentary CLATs can reduce or eliminate estate tax while ultimately delivering a remainder to GST exempt dynasty trusts for descendants. In high 7520 rate environments CRTs can be paired with concentrated low basis assets to diversify inside a tax exempt wrapper and then funnel remainder to family foundations or donor advised funds. Legal Information Institute+1

VI. Step up optimization playbook

Core rules to respect.

• Assets included in the decedent’s gross estate under typical inclusion sections are eligible for basis increase. Basis must match reported estate values when a return is required. eCFR

• Assets in a completed gift grantor trust that are not includible in the estate do not step up at the grantor’s death. IRS

• Gifts within one year that return to the donor or donor’s spouse do not step up. Legal Information Institute

Tools.

• Swap power under section 675 4 C. Use written procedures requiring independent valuation, trustee fiduciary review, and same day settlement to minimize challenge. A well drafted swap power allows the grantor to pull low basis assets from a grantor trust before death and replace them with cash or high basis assets. ILS Webinar Materials

• Upstream basis trusts. Give a senior family member with unused exclusion a limited testamentary power of appointment over assets placed in trust for the senior’s benefit. Add a formula mechanism to expand that power to a general power of appointment to the extent of unused exclusion at the senior’s death.

• Marital basis strategies. In community property states both halves of community property often receive a basis adjustment at the first death. Outside those states a joint exempt step up trust is sometimes used to approximate the outcome where permitted.

• QTIP basis toggles. Because QTIP assets are includible in the surviving spouse’s estate, placing appreciated assets inside a QTIP for the survivor can produce a second basis adjustment at the survivor’s death.

• Valuation discipline. Basis consistency under section 6035 and section 1014 f punishes casual reporting. Line up appraisal teams early, especially if fractional interests or hard to value assets are involved. Justia

VII. Retirement accounts and dynasty trusts after the final RMD regulations

Stretch planning changed. Final regulations issued in July 2024 implement the SECURE Acts. For most non eligible designated beneficiaries subject to the ten year rule, annual required minimum distributions are now required during the ten year window if the decedent died on or after the required beginning date. The Service waived penalties for missed 2021 through 2024 distributions and stated that final rules apply for 2025 and later years. Conduit and accumulation trust design for retirement benefits must be harmonized with these rules and with dynasty trust objectives. Federal Register+1

VIII. QSBS and dynasty trusts after the 2025 law change

The Act significantly expands the QSBS regime for stock acquired after July 4, 2025, including tiered exclusions with shorter holding periods and an increased per issuer cap for new issuances. Non corporate taxpayers include trusts, so carefully structured non grantor dynasty trusts can hold QSBS. Families continue to explore stacking strategies by spreading stock across multiple non grantor trusts. This is an aggressive area that must account for the anti abuse multiple trust regulation under section 643 f and related doctrines. Tie every trust to distinct beneficiaries, purposes, and governance to reduce aggregation risk. Blend QSBS planning with GST shelter and situs choices, and remember that the old rules remain for pre July 2025 issuances. Frost Brown Todd+2Perkins Coie+2

IX. Life insurance inside dynasty structures

ILITs. An irrevocable life insurance trust remains the standard for removing policy proceeds from the taxable estate, provided the insured retains no incidents of ownership. Avoid the three year rule for policies transferred to an ILIT by having the trust purchase new coverage or by structuring a sale to the trust with valuation and proper funding. Coordinate Crummey administration and, for large programs, consider a corporate trustee with specialty administration. Cummings & Cummings Law+1

Split dollar and private placement. Advanced families sometimes pair dynasty trusts with economic benefit or loan regime split dollar to finance large coverage or to move value through collateral arrangements. Recent cases illustrate inclusion risks when formalities are weak, so practitioners should document arms length terms and observe the regulations under sections 1.61 22 and 1.7872 15. Private placement life insurance funded by trusts can wrap investments to defer income tax and reduce future estate tax if ownership and funding are properly structured. Expect heightened scrutiny. Freeman Law+1

X. Grantor trust tax reimbursement and cash flow

Grantor trust status is often desirable because the grantor’s payment of the trust’s income tax allows additional tax free compounding inside the trust. Revenue Ruling 2004 64 explains that the grantor’s tax payments are not gifts. If the governing instrument or local law allows discretionary reimbursement, have an independent trustee and avoid any arrangement that suggests an enforceable right to reimbursement by the grantor. Some recent advice from the Service questions beneficiary consent amendments that add reimbursement powers, so proceed carefully with post funding changes. unclefed.com+1

XI. Governance, controls, and flexibility

Directed and divided trusteeship. Separate investment and distribution functions. Use letters of wishes that can be refreshed over time. Provide for a trust protector with narrowly drawn powers such as adding or removing beneficiaries, moving situs, appointing successor trustees, granting or withholding powers of appointment, and toggling grantor trust powers on or off.

Decanting and modification. In long horizon plans, decanting and nonjudicial modification statutes will eventually be needed. Draft to permit use of those statutes, but limit beneficiary driven changes that could trigger estate inclusion or creditor exposure.

Spendthrift and beneficiary stewardship. Use spendthrift clauses across the dynasty system. Integrate education on trust purpose and distribution standards for future trustees and beneficiaries.

XII. Putting it together by client fact pattern

Two parent family with net worth of 60 million, concentrated in a private business and real estate.

• During life, create two independent SLATs sited in a dynasty jurisdiction. Seed each with diversified assets and a swap power.

• For the business, consider a preferred partnership freeze paired with a sale to an IDGT for growth units, with the GRAT reserved for a particularly volatile sleeve.

• Fund an ILIT for liquidity sized to the estate tax and state death tax that would be due if basis toggles fail.

• Add an upstream basis trust for a parent with modest wealth and strong health to harvest basis on a concentrated low basis block.

• In wills, build a bypass trust with a formula general power that can be granted by an independent person to the extent of unused exclusion at death. Place highly appreciated assets in the marital QTIP for possible second basis increase at the survivor’s death.

• Allocate GST exemption to each perpetual trust to keep growth GST free.

• For retirement assets, route to see through accumulation trusts tailored for the ten year regime and liquidity needs. Federal Register

Founder expecting a QSBS exit in seven years.

• For new issuances after July 2025, spread stock across several truly independent non grantor dynasty trusts with distinct primary beneficiaries and trustees.

• Document business purpose and respect trust separateness to reduce 643 f aggregation risk.

• After the exclusion period, consider moving non QSBS assets into completed gift grantor trusts and use swap powers to manage basis before later deaths. Frost Brown Todd+1

Couple with valuable residences and marketable securities, strong charitable intent, and adult children.

• Use a QPRT for the vacation home.

• Layer a testamentary CLAT to reduce estate tax and deliver remainder to GST exempt trusts for children and grandchildren.

• For concentrated low basis stock, pair a CRT with tax aware reallocation, then coordinate remainder with the family foundation. Schwab Brokerage+1

XIII. Common drafting elements for dynasty trust instruments

• Spendthrift protection and broad discretionary distribution standard.

• Directed trust architecture with investment advisers for complex assets.

• Trust protector with powers to change situs, amend administrative provisions, and grant formula general powers of appointment to harvest basis.

• Power of substitution for the settlor with fiduciary guardrails and valuation requirements. ILS Webinar Materials

• Tax reimbursement clause that is discretionary only and administered by an independent trustee, mindful of Revenue Ruling 2004 64 and later commentary. unclefed.com

• Express decanting permission and nonjudicial settlement language subject to state law.

• Clear accounting, loan, and related party transaction provisions for family entities.

XIV. Funding and administration checklists

Before funding.

• Confirm situs and governing law.

• Align appraisers, especially for FLPs and closely held companies.

• Map basis by lot for swap planning and future consistency reporting. Justia

At funding.

• Observe formalities for transfers into FLPs and LLCs.

• For GRATs and freezes, lock in section 7520 and AFR numbers and calendar annuity or preferred returns. Eide Bailly

Annual.

• Review swap opportunities for basis.

• Re evaluate trustee and protector composition.

• Confirm GST allocations and file Form 709 where needed in light of the 19,000 annual exclusion rules for annual gifts and Crummey programs. IRS

Near a death.

• Inventory low basis assets inside completed gift grantor trusts and execute swaps.

• Consider granting a formula general power of appointment to soak up remaining exclusion.

• For retirement accounts, verify that trust design and beneficiary designations meet the current ten year and annual RMD framework. Federal Register

XV. Cautions and ethics

• Dynasty trusts must be anchored in legitimate nontax purposes. Family governance, creditor protection, and stewardship are genuine purposes that justify long duration planning.

• Avoid last minute FLPs. Courts continue to collapse deathbed partnerships and to include the underlying assets in the estate. Weinstock Manion

• When exploring QSBS stacking with multiple trusts, weigh reputational and audit risk and rely on formal independence and real economic separateness. The multiple trust regulation can aggregate similar trusts if a principal purpose is income tax avoidance. Legal Information Institute

XVI. Rates and numbers to remember for the current season

• Estate and gift basic exclusion 13.99 million per person in 2025. Annual gift exclusion 19,000 in 2025. Tax News+1

• Basic exclusion will be 15 million in 2026 with indexing thereafter under the 2025 Act.

• Section 7520 rate for October 2025 is 4.60 percent. Eide Bailly

• Final RMD regulations apply beginning in 2025 and confirm annual distributions for many non eligible designated beneficiaries under the ten year rule when the decedent died on or after the required beginning date. Federal Register

Closing thoughts

The 2025 legislative reset and the Service’s pronouncements on basis sharpen the difference between transfer tax minimization and income tax efficiency. Dynasty trusts continue to excel at the former. With thoughtful toggles, flexible powers, and careful administration they can serve the latter as well. For families with the will to steward capital across generations, the attorney’s task is to engineer a blueprint that defends against creditors and chaos, exploits lawful tax arbitrage when it exists, and preserves optionality as people and laws change.

Key sources
Numbers and law evolve. Always check current authority before relying on any described strategy.
Core references cited above include the IRS inflation adjustments and gift exclusion for 2025, the 2025 Act’s increase of the unified credit beginning in 2026, section 1014 and the basis consistency regulations, Revenue Ruling 2023 2 on grantor trust step up, modern perpetuities statutes in leading trust jurisdictions, section 7520 rates, and the 2024 final RMD regulations, among others. Federal Register+10Tax News+10IRS+10

• Late portability election relief for five years. Internal Revenue Service

This article is for attorneys and assumes familiarity with federal transfer tax and income tax principles. State law can change outcomes. Confirm application of creditor and family law rules and any state level transfer or inheritance taxes in the relevant jurisdiction before implementing any technique described here.

Disclaimer:
The information provided in this post is for educational and general informational purposes only and does not constitute legal, tax, financial, or other professional advice. Laws, regulations, and interpretations are subject to change frequently and may vary by jurisdiction. You should not rely solely on this information when making decisions affecting your personal circumstances. Please consult with a qualified attorney, tax advisor, or financial professional for advice specific to your situation. The transmission or receipt of this information does not create an attorney-client relationship or any other professional relationship. This post may be considered advertising under applicable state laws.