When a client sits down with us after losing a parent or receiving an inheritance, one of the first questions we hear is some version of: "There's a trust — does that mean we avoid probate? Does it mean we avoid taxes?" The answer to both questions is: it depends, and the two questions have very different answers.

Estates and trusts are related concepts in wealth transfer law, but they are distinct legal entities with distinct tax treatment. Conflating them — or assuming one automatically solves the problems of the other — is one of the most common and costly mistakes families make during an already difficult time.

When a person dies, their assets do not immediately transfer to heirs. A legal entity called the decedent's estate comes into existence and holds those assets during the administration period — the time it takes to pay debts, file final returns, and distribute property to beneficiaries.

The estate is a separate taxpayer. It files its own income tax return, Form 1041, for any income earned during administration. If the estate earns more than $600 in gross income in a tax year, it must file.

The estate also has its own compressed tax brackets. In 2026, the top federal income tax rate of 37% applies to estate income above approximately $15,650. Compare that to an individual, who doesn't reach the 37% bracket until income exceeds $626,350 (single filer). This compression is intentional — Congress designed it to discourage prolonged estate administration as a tax deferral strategy.

The estate's tax year begins on the date of death. The executor can elect either a calendar year or a fiscal year ending on the last day of any month within 12 months of death. Choosing a fiscal year can shift income recognition and provide planning flexibility.

A trust is a legal arrangement in which one party (the grantor) transfers assets to a trustee to hold and manage for the benefit of one or more beneficiaries. Trusts can be created during life (inter vivos trusts) or at death through a will (testamentary trusts).

For tax purposes, the critical distinction is between grantor trusts and non-grantor trusts.

A grantor trust is one where the grantor retains sufficient control or economic interest that the IRS treats the trust as a disregarded entity for income tax purposes. The trust's income, deductions, and credits flow directly to the grantor's individual return. No separate Form 1041 is required — or rather, a Form 1041 may be filed but only as an informational return.

Revocable living trusts — the most common trust used in estate planning — are grantor trusts during the grantor's lifetime. They are popular because they avoid probate, allow for disability planning, and provide privacy. But they provide no income tax benefit while the grantor is alive. The grantor still pays tax on all trust income at individual rates.

When a trust becomes irrevocable — either because the grantor made it irrevocable at creation or because the grantor died — it typically becomes a non-grantor trust and a separate taxpayer. It files its own Form 1041 and is subject to the same compressed tax brackets as an estate.

This is where the planning gets complex. A non-grantor trust that accumulates income pays tax at the 37% rate on income above roughly $15,650. A trust that distributes income to beneficiaries can deduct that distribution (up to the distributable net income, or DNI), and the beneficiaries report it on their own returns at their individual rates. If the beneficiaries are in lower brackets, distributing income rather than accumulating it can produce significant tax savings.

Distributable net income (DNI) is the central concept governing how income is taxed when a trust or estate makes distributions to beneficiaries.

DNI represents the maximum amount of income that can be taxed to beneficiaries rather than to the trust or estate. It is calculated by starting with taxable income, adding back the deduction for distributions, and making certain adjustments for tax-exempt income and capital gains.

The mechanics matter:

• If a trust distributes less than its DNI, the trust pays tax on the undistributed portion.
• If a trust distributes more than its DNI, the excess is treated as a tax-free return of corpus — not taxable income to the beneficiary.
• Capital gains are generally included in DNI only if the trust instrument or state law requires them to be distributed, or if the trustee exercises discretion to include them.

This last point is frequently misunderstood. In many trusts, capital gains are allocated to principal rather than income, which means they stay in the trust and are taxed at the trust level — at the compressed 37% rate — rather than passing through to beneficiaries. Trustees who have discretion over this allocation have a meaningful planning lever.

One of the most important distinctions to understand is that estate tax and income tax are entirely separate systems.

The federal estate tax applies to the transfer of wealth at death. In 2026, the estate tax exemption is approximately $13.99 million per individual (indexed for inflation). Estates below this threshold owe no federal estate tax. Estates above it pay tax at rates up to 40%.

The income tax on estates and trusts — the Form 1041 system — applies to income earned by the estate or trust during administration or operation. An estate worth $500,000 owes no estate tax but still files Form 1041 if it earns income during administration. An estate worth $20 million owes estate tax and also files Form 1041 for income earned during administration.

These are parallel obligations, not alternatives. Confusing them leads to missed filings, underpayment penalties, and sometimes significant tax liability that could have been managed with proper planning.

One of the most powerful income tax benefits associated with death is the step-up in basis under Section 1014. When a beneficiary inherits an asset, their cost basis is generally stepped up to the fair market value of the asset on the date of death (or the alternate valuation date, if elected).

This means that decades of unrealized capital gains are permanently eliminated. A stock purchased for $10,000 that is worth $500,000 at death passes to the beneficiary with a $500,000 basis. If the beneficiary sells it immediately, there is no capital gain.

Assets held in a revocable living trust receive the step-up because they are included in the grantor's taxable estate. Assets transferred to an irrevocable trust during life generally do not receive a step-up — they carry the grantor's original basis. This is a critical planning consideration when deciding whether to transfer appreciated assets to an irrevocable trust.

In our practice — and in our years at the IRS — the most common failures in estate and trust tax compliance fall into predictable patterns:

Failure to file Form 1041. Many families and even some attorneys don't realize that an estate or trust with more than $600 in gross income must file. Interest income on a bank account held during administration, rental income from inherited property, dividends from an inherited brokerage account — all of these trigger a filing obligation.

Incorrect treatment of capital gains. Trustees routinely allocate capital gains to corpus and then fail to report them on Form 1041, or report them incorrectly. The IRS has increased scrutiny of trust capital gain reporting.

Missing the DNI calculation. Distributing trust income to beneficiaries without properly calculating DNI — and issuing the corresponding Schedule K-1s — creates mismatches that trigger IRS notices.

Ignoring state fiduciary income tax. Many states impose their own fiduciary income tax, with their own rules about what constitutes a resident trust and what income is taxable. A trust administered in Arizona, with a California beneficiary and assets in Texas, may have filing obligations in multiple states.

Late elections. The fiscal year election for estates, the Section 645 election to treat a revocable trust as part of the estate, and the election to treat certain trusts as qualified revocable trusts all have strict deadlines. Missing them forecloses planning options permanently.

When a grantor dies with a revocable living trust, the trust becomes irrevocable and a separate taxpayer — unless the executor and trustee make a Section 645 election to treat the trust as part of the estate for income tax purposes.

This election allows the combined estate and trust to use a fiscal year, potentially defer income recognition, and file a single Form 1041 rather than two. It also allows the trust to take advantage of the estate's $600 exemption (versus the trust's $100 or $300 exemption) and to deduct certain administrative expenses that would otherwise be subject to limitations.

The election must be made by the due date of the estate's first Form 1041. It is irrevocable once made. For estates with significant income-producing assets and a revocable trust, it is almost always worth evaluating.

The tax treatment of estates and trusts is not a set-it-and-forget-it matter. The decisions made at the drafting stage — how income and principal are defined, whether the trustee has discretion over distributions, how capital gains are allocated — have lasting tax consequences that play out over years or decades.

If you are currently serving as an executor or trustee, or if you are in the process of updating your estate plan, the tax implications deserve the same attention as the legal structure. An estate plan that is legally sound but tax-inefficient can cost beneficiaries far more than the cost of proper planning.

At Autarky Tax and Accounting, our team includes former IRS agents who have reviewed estate and trust returns from the government's side. We bring that perspective to every engagement — whether we are preparing Form 1041, advising on trust distributions, or helping a family navigate the administration of a complex estate.

If you have questions about an estate or trust you are administering, or if you want to review the tax implications of your current estate plan, contact us for a consultation.

Related: Estate & Trust Tax Services · Form 1041 vs. Form 706: Which Return Does Your Estate Need? · Building Generational Wealth