Irrevocable Trusts Hit the Top Tax Brackets at $15,200

How Capital Gains Tax and Trusts Actually Work

Capital gains tax and trusts interact in ways that standard financial advice rarely captures accurately. The core issue: irrevocable non-grantor trusts reach the top federal tax brackets at roughly $15,200 of taxable income in 2024, compared to $609,350 for a single individual filer. That compression alone makes trust structure decisions consequential for anyone holding appreciated assets.

This article covers the mechanics, the trade-offs, and the planning strategies that matter at the $5M+ level.

How Capital Gains Are Taxed in an Irrevocable Trust

The IRS treats irrevocable non-grantor trusts as separate taxpaying entities. They file Form 1041, report their own income and capital gains, and pay tax at trust-level rates unless gains are distributed to beneficiaries. According to the IRS Instructions for Form 1041, the trust document and trustee discretion determine whether gains stay at the trust level or pass through.

The bracket compression is severe. Per IRS Revenue Procedure 2023-34, the 2024 trust tax brackets look like this:

A single individual filer does not reach the 37% ordinary income rate until $609,350, and the 20% long-term capital gains rate until $583,750. For a trust holding a concentrated position or generating substantial investment income, retaining gains at the trust level is almost always the most expensive option available.

The 3.8% Net Investment Income Tax compounds this. Under IRC Section 1411, the NIIT threshold for trusts in 2024 is approximately $15,200, meaning virtually all investment income retained in a non-grantor trust is subject to NIIT on top of regular capital gains rates. The effective top federal rate on long-term gains retained at the trust level reaches 23.8%. On short-term gains, it reaches 40.8%.

Distributing those gains to beneficiaries in lower brackets eliminates or substantially reduces the NIIT burden. That is the central distribution planning insight most trustees underutilize.

What Is the Difference Between a Grantor Trust and a Non-Grantor Trust for Capital Gains?

The grantor versus non-grantor distinction drives most of the planning decisions around capital gains tax and trusts.

Under IRC Sections 671 through 679, a grantor trust is one where the grantor retains certain powers over the trust assets. The IRS treats the grantor as the owner for income tax purposes. Capital gains flow directly to the grantor's personal return and are taxed at individual rates, not compressed trust rates. A revocable living trust is the most common example. You can read more about how revocable trusts are taxed differently and why they offer limited asset protection despite their tax simplicity.

Non-grantor trusts, typically irrevocable trusts where the grantor has relinquished control, are separate taxpaying entities. They file their own returns, hold assets in their own name, and pay tax at trust rates on retained income. The trade-off for that tax exposure is meaningful: assets removed from the grantor's estate reduce estate tax liability, and the trust provides creditor protection and distribution control that a revocable structure cannot.

The practical decision point for most FATFIRE-level estate plans is not revocable versus irrevocable in the abstract. It is which irrevocable structure produces the best after-tax outcome across income tax, estate tax, and generation-skipping transfer tax simultaneously. Those objectives frequently conflict, and optimizing for one can create exposure in another.

The Step-Up in Basis Problem: What Irrevocable Trusts Cost You at Death

This is the trade-off that catches people off guard.

Under IRC Section 1014, assets transferred at death generally receive a stepped-up cost basis to fair market value on the date of death. For a portfolio with $3M in unrealized gains, that step-up eliminates the embedded capital gains tax entirely for heirs. It is one of the most valuable provisions in the tax code for high-net-worth estates.

Assets held in an irrevocable non-grantor trust during the grantor's lifetime typically do not qualify for this step-up. Because those assets are no longer part of the grantor's taxable estate, they pass to beneficiaries carrying the original cost basis. The estate tax savings are real, but so is the embedded capital gains liability that heirs inherit.

For a FATFIRE portfolio with highly appreciated positions, this trade-off deserves explicit modeling before any irrevocable transfer. Consider a scenario: a grantor transfers $8M of stock with a $1M cost basis into an irrevocable non-grantor trust. The estate tax savings on $8M at a 40% rate could exceed $3M. But heirs who eventually sell face a $7M gain taxed at combined federal and state rates that, in California, can approach 37%. The net outcome depends on holding periods, beneficiary tax rates, and whether the assets are ever sold.

Certain grantor trusts that remain includable in the estate for estate tax purposes can still qualify for the step-up. That inclusion is sometimes intentional, particularly for assets with large embedded gains and modest estate tax exposure.

How Intentionally Defective Grantor Trusts Reduce Capital Gains Tax

The Intentionally Defective Grantor Trust (IDGT) is one of the more effective structures for high-net-worth families trying to separate estate tax treatment from income tax treatment.

An IDGT is structured to be outside the grantor's estate for estate tax purposes while remaining a grantor trust for income tax purposes under IRC Sections 671 through 679. The result: assets appreciate outside the estate, reducing future estate tax exposure, while capital gains and other income flow to the grantor's personal return and are taxed at individual rates rather than compressed trust rates.

The grantor's payment of income tax on trust earnings functions as an additional tax-free gift to beneficiaries. The trust assets grow without being eroded by income taxes at the trust level, and the grantor's estate shrinks by the amount of taxes paid. According to the American Bar Association's Section of Real Property, Trust and Estate Law, this structure effectively transfers wealth in two directions simultaneously.

The IDGT does not solve the step-up in basis problem. Assets in an IDGT that are outside the estate do not receive a stepped-up basis at death. For assets with very large embedded gains and a long expected holding period, that cost needs to be weighed against the estate tax and income tax benefits. Grantor trustee arrangements in irrevocable trusts add another layer of complexity worth reviewing with counsel before finalizing the structure.

Can an Irrevocable Trust Avoid Capital Gains Tax by Distributing Gains to Beneficiaries?

Yes, with conditions. This is the primary planning lever available to trustees of non-grantor irrevocable trusts, and it is underused.

The default rule under trust tax law is that capital gains are excluded from Distributable Net Income (DNI) and taxed at the trust level. DNI represents the maximum amount of income a trust can distribute to beneficiaries and deduct from its own taxable income. Because gains are typically excluded from DNI, they stay in the trust and get hit with compressed trust rates plus NIIT.

There are three exceptions that allow capital gains to be included in DNI and distributed to beneficiaries:

1. The trust document explicitly allocates capital gains to income. If the governing instrument directs that gains are distributable, they can flow to beneficiaries.
2. The trustee has discretionary authority to distribute principal, and consistently exercises that discretion to distribute gains under a regular practice.
3. The trust is in its final year. All gains are included in DNI in the termination year.

When gains are successfully distributed, they are taxed at the beneficiary's individual rate. For beneficiaries in the 0% or 15% long-term capital gains bracket, the tax savings versus trust-level taxation can be substantial. The 65-day rule under IRC Section 663(b) allows trustees to treat distributions made within the first 65 days of the new tax year as if made in the prior year, providing a planning window after year-end.

For a trust generating $500,000 in long-term capital gains, the difference between retaining those gains at the trust level (20% federal plus 3.8% NIIT) and distributing them to a beneficiary in the 15% bracket is roughly $43,000 in federal tax alone, before state taxes.

Capital Gains Tax Rates for Trusts in 2024: Federal vs. State

Federal rates are only part of the picture. Several states do not offer preferential capital gains rates and tax gains as ordinary income.

For a California resident with a non-grantor trust retaining $1M in long-term capital gains, the combined federal and state tax bill approaches $368,000. The same gains distributed to a beneficiary in a no-income-tax state could be taxed at 20% federal plus 3.8% NIIT, totaling roughly $238,000. That $130,000 difference is a planning opportunity, not a rounding error.

Trust siting matters because some states tax trust income based on the residence of the trustee, the grantor, or the beneficiaries, not just where the trust was formed. Nevada, South Dakota, and Wyoming have favorable trust laws and no state income tax, making them common choices for trust siting when the goal is minimizing state-level capital gains exposure. This requires a trustee with nexus in the chosen state and careful attention to whether the beneficiary's state will assert jurisdiction over distributed income.

Generation-skipping transfer tax planning intersects with trust siting decisions, particularly for dynasty trusts designed to hold assets across multiple generations in perpetuity states.

Selling a Home Held in an Irrevocable Trust: The Section 121 Problem

The Section 121 exclusion allows individuals to exclude up to $250,000 of capital gains ($500,000 for married couples filing jointly) from the sale of a primary residence. When a home is held in an irrevocable trust, that exclusion becomes complicated.

The IRS has provided limited formal guidance on applying Section 121 to trust-owned residences. The general framework: if the trust is a grantor trust and the grantor uses the home as a primary residence meeting the two-year ownership and use tests, the exclusion may apply. For non-grantor irrevocable trusts, the exclusion is generally unavailable because the trust itself does not meet the use test.

The home sale exclusion rules for irrevocable trusts carry significant dollar implications for high-value real estate. Consider a primary residence transferred to an irrevocable trust with a $500,000 cost basis that later sells for $3.5M. An individual seller could exclude $250,000 to $500,000 of gain. The trust, if it cannot claim the exclusion, pays tax on the full $3M gain at compressed trust rates plus NIIT, producing a federal tax bill that could exceed $700,000 before state taxes.

A Qualified Personal Residence Trust (QPRT) is a specific irrevocable trust structure designed for high-value real estate. The grantor transfers the residence into the QPRT at a discounted gift tax value, retaining the right to live there for a fixed term. At the end of the term, the property passes to beneficiaries at a reduced gift tax cost. The trade-off: beneficiaries inherit the grantor's original cost basis rather than a stepped-up basis, embedding a potentially large capital gain. In California or New York, where combined capital gains rates can exceed 33%, that embedded gain deserves explicit modeling before committing to a QPRT structure.

Irrevocable Trust Structures: Capital Gains and Estate Tax Trade-offs

Not all irrevocable trusts handle capital gains the same way. The structure choice drives both the income tax outcome and the estate planning result.

The key benefits of irrevocable trusts extend well beyond capital gains management, but the income tax implications of each structure should be modeled explicitly before funding. A trust that saves $2M in estate taxes but costs $800,000 more in capital gains tax over a 20-year period may or may not be the right choice depending on the family's liquidity, beneficiary tax rates, and asset holding intentions.

Planning Strategies to Minimize Capital Gains Tax in Irrevocable Trusts

The strategies that actually move the needle at the $5M+ level are structural, not cosmetic.

Draft distribution language carefully. If the trust document includes explicit provisions allocating capital gains to income or granting the trustee broad discretion to distribute principal, the trustee has the tools to push gains to beneficiaries in lower brackets. Trusts drafted without this language leave the trustee with limited options after the fact.

Use the 65-day rule. Under IRC Section 663(b), distributions made within the first 65 days of the tax year can be treated as prior-year distributions. This gives trustees a window after December 31 to assess the trust's tax position and make distributions that reduce the prior year's trust-level tax liability.

Coordinate asset location across the estate plan. Tax-inefficient assets that generate short-term gains or ordinary income belong in structures where the income can be distributed to lower-bracket beneficiaries or offset by deductions. Tax-efficient assets with long holding periods and low turnover are better candidates for trust retention.

Consider the Section 645 election for estates. The Section 645 election tax benefits allow a qualified revocable trust to be treated as part of the decedent's estate for income tax purposes during the administration period, potentially providing access to the estate's fiscal year election and higher DNI thresholds.

Model the step-up trade-off before transferring appreciated assets. For assets with large embedded gains and a reasonable probability of sale within the beneficiary's lifetime, the lost step-up in basis may outweigh the estate tax savings. This is not a reason to avoid irrevocable trusts; it is a reason to be deliberate about which assets fund them.

For additional strategies to minimize capital gains taxes on appreciated positions more broadly, the interaction between trust structure and individual holding decisions deserves coordinated review across your tax attorney, CPA, and investment advisor.

What Expenses Can Reduce Capital Gains Tax Liability in a Trust

Trusts can deduct certain expenses against income, which reduces the net amount subject to capital gains tax and NIIT. The Tax Cuts and Jobs Act of 2017 suspended miscellaneous itemized deductions for individuals, but trusts retain the ability to deduct expenses that are unique to the trust's administration.

Deductible trust expenses include trustee fees, attorney fees for trust administration, accounting fees for trust tax returns, and investment advisory fees directly attributable to trust assets. These deductions reduce the trust's adjusted gross income, which in turn reduces the NIIT calculation under IRC Section 1411.

Understanding allowable expenses paid from irrevocable trusts is particularly relevant for complex trusts with active investment management, real estate holdings, or ongoing legal administration costs. A trust paying $50,000 annually in deductible administrative expenses effectively reduces its NIIT exposure by $1,900 per year at the 3.8% rate, in addition to the ordinary income tax savings.

Irrevocable life insurance trust tax returns involve a distinct set of considerations, particularly when the trust holds policies with cash value or receives death benefit proceeds that interact with the trust's investment income calculations.

References

• Internal Revenue Service -- "Publication 550: Investment Income and Expenses" (2023).
• Internal Revenue Service -- "Instructions for Form 1041: U.S. Income Tax Return for Estates and Trusts" (2023).
• Internal Revenue Code -- "IRC Section 1014: Basis of Property Acquired from a Decedent."
• Internal Revenue Code -- "IRC Section 1411: Imposition of Tax (Net Investment Income Tax)."
• Internal Revenue Code -- "IRC Sections 671 through 679: Grantor Trust Rules."
• Internal Revenue Service -- "Revenue Procedure 2023-34: 2024 Inflation Adjustments for Tax Provisions" (2023).
• American Bar Association -- "Section of Real Property, Trust and Estate Law: IDGT Planning Strategies."
• Journal of Financial Planning -- "Trust Taxation and Wealth Transfer Efficiency for High-Net-Worth Families."