New IRS Rule for Irrevocable Trusts: TD 9991 Explained (2026)

If you've searched for the "new IRS rule for irrevocable trusts," you've probably come across confusing or conflicting information. Here's the plain-language answer: the rule you're likely hearing about is not about canceling, voiding, or altering your irrevocable trust. It's about how inherited property's income-tax basis must be reported, and it directly affects executors, trustees, and families who receive assets from a decedent's estate through an irrevocable trust.

What TD 9991 actually says

In September 2024, the IRS and Treasury Department finalized regulations known as TD 9991, published in the Federal Register and effective September 17, 2024. These final regulations implement two related statutory requirements:

1. IRC §1014(f): the consistent basis requirement. A beneficiary (including a trust) that receives property from a decedent's estate must use a tax basis that is consistent with the value the estate reported for federal estate-tax purposes. The consistent basis requirement stays in place until the property is sold, exchanged, or otherwise disposed of in a taxable transaction, or until the property is included in another decedent's gross estate.

2. IRC §6035: the basis reporting requirement. Executors must file an information return (using Form 8971) and furnish individual beneficiary statements documenting those estate-tax values, so that the IRS can verify consistency when the property is eventually sold.

The legal authority for these rules traces back to H.R. 3236, the Surface Transportation and Veterans Health Care Choice Improvement Act of 2015, signed July 31, 2015. The September 2024 final regulations replaced earlier proposed guidance, and minor corrections to the final rule became effective on March 19, 2026.

The regulations apply where an estate tax return is filed after July 31, 2015, and where estate tax liability increases after applying allowable credits. "Consistent basis property" is defined as property to which IRC §1014(a) applies and that meets those inclusion criteria.

Who is actually affected

Three groups face the most direct obligations under TD 9991:

Executors and personal representatives must file Form 8971 (the information return) and attach a beneficiary statement for each recipient of "included property." This applies when the estate files a required federal estate tax return and the property's inclusion increases estate-tax liability.

Trustees of beneficiary trusts face an additional layer of reporting. When a trust receives reported property and later makes an in-kind distribution of that same property to another trust or individual beneficiary, the trustee (not just the executor) must file and furnish statements. Individual beneficiaries generally are not responsible for "subsequent transfer reporting" under the final regulations. That obligation falls on the trustee.

Families with irrevocable trusts that are named as beneficiaries of an estate should be aware that the trust's income-tax basis in any inherited property must match the final estate-tax value. For Brooklyn families using irrevocable trust strategies for asset protection, this is not a reason to dismantle or restructure your trust. It's a record-keeping and coordination issue between your executor, trustee, and CPA.

Key deadlines you can't miss

The timing rules in the final regulations (§1.6035-1(c)(3)) are specific:

• Effective date of TD 9991: September 17, 2024.

• Corrections effective date: March 19, 2026.

• Initial reporting deadline: The executor must file Form 8971 and furnish beneficiary statements on or before the earlier of (A) 30 days after the estate tax return due date (including extensions), or (B) 30 days after the actual filing date.

• Late-acquired property: If the trust or beneficiary acquires reportable property after the estate tax return due date (or earlier filing), the executor must furnish the statement by January 31 of the year following the year in which the trust acquired the property. The supplemental information return has the same January 31 deadline.

• Supplemental updates: When the estate's final values change (for example, after an IRS audit), the updated statement and supplemental return are due within 30 days of when the relevant information becomes available.

Missing these deadlines exposes the executor (and potentially the trustee) to penalties for failure to file a correct information return and failure to furnish correct payee statements.

What this means for capital gains and trust income taxes

The practical tax consequence of the IRC §1014(f) consistent basis rule is straightforward. When the trust eventually sells inherited property, the gain or loss is calculated from the consistent basis, which equals the estate's final determined value. If the executor reported a Brooklyn row house at $800,000 on the estate return and the trust later sells it for $950,000, the trust's taxable gain is $150,000, not some lower number based on a different basis.

The risk of ignoring the rule cuts both ways. A trustee who uses a lower basis (and thus understates the gain) faces deficiency assessments and penalties. A trustee who uses a higher basis than the estate reported also violates the consistency requirement. Form 1041 (the trust's income tax return) must align with what was reported on Form 8971 and the estate's return.

What TD 9991 does not do: it doesn't rewrite general step-up in basis rules under IRC §1014(a), and it doesn't require existing irrevocable trusts to be amended. The trust's legal status, Medicaid-planning function, and asset-protection structure remain intact. The rule changes how fiduciaries track and report inherited asset values, not how trusts are formed or taxed as entities.

For families exploring Medicaid planning and asset protection trusts, this distinction matters. The new reporting framework doesn't affect your trust's Medicaid look-back position or its role in shielding assets from long-term care costs.

Practical steps for trustees, executors, and families

If you're the executor or personal representative:

• Confirm whether the estate is required to file a federal estate tax return and whether the reportable-property threshold is met.

• Document the estate's final values for each asset distributed to the trust or any beneficiary.

• File Form 8971 and attach beneficiary statements on the correct deadline. Don't wait until the return is finalized with the IRS if the early-filing trigger applies.

• Retain copies of everything. If the IRS later audits the estate and adjusts values, you'll need to file a supplemental Information Return within 30 days of that determination.

If you're the trustee of a beneficiary trust:

• Create a log of every property item the trust received from a decedent's estate, the reported estate-tax value, and the date of acquisition.

• When the trust makes an in-kind distribution of any such property to another trust or person, check whether trustee reporting obligations apply and flag the January 31 deadline for the following year.

• Coordinate with the estate attorney and CPA before filing Form 1041 to verify that reported basis figures match the estate return.

For families: Ask the executor for a copy of the Form 8971 beneficiary statement and keep it in your permanent tax file. That document is your proof of consistent basis if the IRS ever questions the trust's gain calculation on a future sale. This is especially important for families holding real estate in Brooklyn and the outer boroughs, where property values have appreciated significantly.

Reviewing the trust documents with an experienced attorney is a good idea, not because the documents likely need to change, but because your trustee needs to understand these new reporting duties. You can learn more about trust and estate administration and the executor's role in the process.

Three scenarios that show how the rules play out

Scenario 1: Trust receives real property at funding. An estate distributes a Queens apartment to an irrevocable trust. The estate return reports the apartment's value at $620,000. That figure becomes the trust's consistent basis. When the trust sells years later for $720,000, the taxable gain is $100,000. The executor must have furnished a Statement to the trustee within 30 days of the earlier of the estate return due date or filing date.

Scenario 2: IRS audit adjusts the estate value. The IRS examines the estate and increases the apartment's value to $660,000. The estate's final value is now $660,000. The trust must use $660,000 as its basis in any open tax years. The executor files a supplemental Form 8971 within 30 days of the final IRS determination. If the trust already sold the property using the original $620,000 basis, an amended Form 1041 may be required with the help of a tax professional.

Scenario 3: Trust distributes property in-kind. The beneficiary trust later distributes the apartment in-kind to an individual beneficiary (rather than selling it). The trustee must furnish a statement reporting the consistent basis to that beneficiary and file a supplemental Information Return by January 31 of the year following the distribution. The individual beneficiary then holds the property with the same consistent basis.

Frequently asked questions

Does this rule change my irrevocable trust's tax treatment? No. TD 9991 governs basis consistency and reporting for inherited assets. It doesn't alter how your trust is taxed as a grantor or non-grantor trust, and it doesn't affect the trust's Medicaid asset protection function.

Does my existing irrevocable trust need to be amended? Almost certainly not, based solely on these regulations. The practical need is to update trustee workflows and record-keeping to reflect the reporting requirements for inherited assets. Reviewing the trust with counsel is worthwhile to make sure your trustee understands their obligations, but amendment is typically not required.

Grantor trust vs. non-grantor trust: which is affected? The regulations turn on whether property qualifies as "included property" under the estate tax rules, not simply on grantor or non-grantor trust status. Ask your attorney or CPA to analyze whether the specific assets your trust received meet the definition. The IRS's estate and gift tax guidance page (last updated July 23, 2026) summarizes the consistent basis rules and references TD 9991 directly.

What if no estate tax was owed? The IRS has clarified that the reporting obligation can still apply if a federal estate tax return was required to be filed, even if the estate ultimately owed no tax. Whether a return was "required" depends on the gross estate value exceeding the applicable exclusion amount for the year of death.

What if the trust already sold the property? If the trust used a basis inconsistent with the estate return values, there may be a capital gains deficiency and potential penalties. Don't file amended returns without first consulting a tax professional and reviewing what the estate's actual reported values were. The Brooklyn Probate & Trust Administration process involves coordinating these records, and doing it correctly the first time saves significant cost later.

How Alatsas Law Firm can help

For middle-income Brooklyn families, the administrative burden of these rules can feel disproportionate to the size of the estate. A $650,000 house or a modest investment account that passes through an irrevocable trust now requires careful coordination between the executor, trustee, and CPA to avoid capital gains surprises and IRS penalties.

At Alatsas Law Firm, we assist with the full scope of trust and probate administration for New York families, including the specific workflow that TD 9991 requires: reviewing estate return values, confirming Form 8971 compliance, aligning those figures with the trust's Form 1041 reporting, and advising trustees on subsequent-transfer obligations. Our approach focuses on clear documentation and coordinated fiduciary practice, not on creating unnecessary amendments or alarming clients.

If your irrevocable trust is receiving, or has recently received, inherited property, schedule a review of your basis and reporting workflow. Bring your executor, trustee, and CPA to the table. That coordinated review is the single most practical step you can take to protect your family's assets from an avoidable tax problem.

For guidance on how these rules fit within your broader Medicaid planning and long-term care strategy, or to discuss your estate administration situation, contact Alatsas Law Firm at 718-233-2903.

Sources

• IRS, "What's New - Estate and Gift Tax" (Consistent basis reporting section, last reviewed July 23, 2026): https://www.irs.gov/businesses/small-businesses-self-employed/whats-new-estate-and-gift-tax

• Federal Register, TD 9991, "Consistent Basis Reporting Between Estate and Person Acquiring Property From Decedent" (effective September 17, 2024): https://www.federalregister.gov/documents/2024/09/17/2024-19975/consistent-basis-reporting-between-estate-and-person-acquiring-property-from-decedent

• Federal Register, TD 9991 Correction (effective March 19, 2026): https://www.federalregister.gov/documents/2026/03/19/2026-05830/consistent-basis-reporting-between-estate-and-person-acquiring-property-from-decedent-correction