Form 1041-ES: Estimated Tax Deadlines, Safe Harbors, and Payments

A fiduciary uses Form 1041-ES to pay estimated income tax for estates and trusts in four installments across the year whenever the entity expects to owe $1,000 or more after withholding and credits.¹ Miss an installment or underpay one, and the IRS charges a penalty computed at 7% per year, compounded daily, running separately for each quarter the shortfall sits unpaid.²

Who Has to File and Pay

The $1,000 threshold covers regular income tax, the alternative minimum tax, and the 3.8% net investment income tax combined. If the projected total after credits and withholding reaches that figure, estimated payments are required.¹

Some entities are exempt regardless of the tax due:

A decedent’s estate owes no estimated tax for any tax year ending within two years of the date of death. The clock runs from the date of death, not the date probate opens.³
A trust that was entirely owned by the decedent during life and that will receive the residue of the estate gets the same two-year exemption.³
Tax-exempt trusts owing only unrelated business income tax use Form 990-W instead of 1041-ES, and their threshold is $500.⁴

One boundary worth stating clearly. A grantor trust that remains fully owned by a living person does not file Form 1041 or 1041-ES at all. The grantor picks up the income on their personal return and makes any estimated payments through Form 1040-ES.

Payment Deadlines for 2026

For calendar-year trusts and estates, the four installments are due:

1st installment: April 15, 2026
2nd installment: June 15, 2026
3rd installment: September 15, 2026
4th installment: January 15, 2027

The gap between the first two installments is only two months, which catches some fiduciaries off guard. If a due date lands on a weekend or legal holiday, it shifts to the next business day.¹ Paying the full year with the first installment is allowed if that suits the entity’s cash flow.

Fiscal-year filers use the same pattern shifted to their year: the 15th day of the 4th, 6th, and 9th months of the fiscal year, then the 15th day of the 1st month after year-end.

Calculating the Estimated Tax

The Form 1041-ES package contains a worksheet. The logic runs in four steps: project gross income, subtract deductions, apply the tax rates, and reduce by credits.

Projecting Taxable Income

Start with expected gross income for the full year. Subtract the income distribution deduction, which covers amounts paid or required to be distributed to beneficiaries. Only what the entity retains is taxed at the entity level. The deduction is capped at distributable net income, a modified taxable-income figure that keeps items like capital gains allocated to corpus from being pushed out to beneficiaries.⁵

Then subtract the personal exemption: $600 for an estate, $300 for a simple trust (one required to distribute all income currently), and $100 for a complex trust. The result is estimated taxable income.

Applying the Rates

Trust and estate brackets are compressed hard. For 2026:¹

10% on taxable income up to $3,300
24% from $3,301 to $11,700
35% from $11,701 to $16,000
37% over $16,000

The 3.8% net investment income tax stacks on top of the top bracket for entities with undistributed investment income, producing a combined 40.8% marginal rate above $16,000. That compression is the reason fiduciaries often distribute income to beneficiaries in lower brackets rather than retain it.

After computing gross tax, subtract credits. Foreign tax credits and business credits passing through from underlying investments are the usual ones. Divide the result into four installments.

When Income Arrives Unevenly

If most of the entity’s income comes in late in the year, equal quarterly payments force overpayment early. The annualized income installment method lets each quarter’s payment reflect income actually earned through that period. Payments will not be equal. If you use it, file Form 2210 with the final Form 1041 showing how each installment was computed.⁶ Refresh the projection each quarter and adjust the next installment when the earlier estimate misses.

How to Submit Payments

EFTPS is the IRS’s preferred channel for entities. Enrollment is required first, and the IRS mails a PIN to the entity’s address of record in five to seven business days, so newly established trusts and estates should start the process well before the first due date.⁷ The scheduling rule that trips people up: payments must be scheduled by 8:00 p.m. ET at least one calendar day before the due date, not on the due date.⁸ Submit later than that and the payment counts as late.

IRS Direct Pay debits a bank account without pre-enrollment. Individual payments cannot equal or exceed $10 million, and no more than five payments are accepted within a 24-hour window.⁹

Paper vouchers from the Form 1041-ES package still work. Mail a check or money order with the correct voucher, marking the entity’s EIN and tax year, and allow for postmark timing.

Keep proof of every payment. EFTPS confirmation numbers, bank records, and canceled check images all serve. If the IRS later disputes a payment, the fiduciary carries the burden of proving it went in.

Avoiding the Underpayment Penalty

The penalty is computed on the underpayment amount for the period it stays unpaid, at the published quarterly rate. That rate is 7% per year for the first quarter of 2026, compounded daily.² Because the clock runs quarter by quarter, a missed Q1 payment costs more than the same shortfall in Q4.

Safe Harbors

You avoid the penalty entirely if total estimated payments and withholding equal at least:

90% of the tax shown on the current year’s Form 1041, or
100% of the tax shown on the prior year’s Form 1041.¹

Higher-income entities face a stricter version. If the trust or estate reported adjusted gross income above $150,000 on the prior year’s return, the prior-year safe harbor rises to 110% of that year’s tax.¹ Given how quickly trust income runs into the top bracket, many trusts with real retained earnings cross that AGI line. The prior-year safe harbor is easiest to lean on when current-year income is unpredictable, since prior-year tax is a known number.

Waivers

The IRS will waive all or part of the penalty in narrow circumstances. You may qualify if:

The underpayment resulted from a casualty, disaster, or other unusual circumstance and imposing the penalty would be unfair, or
The fiduciary retired after reaching age 62 or became disabled during the tax year, and the underpayment was due to reasonable cause.

For federally declared disaster areas, the IRS identifies affected taxpayers by location and applies relief automatically, no Form 2210 required.¹⁰ For any other waiver, file Form 2210 with the return and check the waiver request box.

Shifting Payments to Beneficiaries

If the entity distributes most of its income and the beneficiaries will owe individual tax on those distributions, the fiduciary can elect to credit some or all of the entity’s estimated payments to beneficiaries instead. File Form 1041-T, Allocation of Estimated Tax Payments to Beneficiaries, by the 65th day after the close of the entity’s tax year.¹¹ Allocated amounts are treated as estimated payments made by the beneficiaries on the last day of the entity’s tax year. It’s a useful correction when the distribution pattern shifts mid-year and the entity ends up overpaid relative to its final retained income.

1
Internal Revenue Service. Form 1041-ES – Estimated Income Tax for Estates and Trusts
2
Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026
3
Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax
4
Internal Revenue Service. Estimated Tax: Unrelated Business Income
5
Office of the Law Revision Counsel. 26 USC 643 – Definitions Applicable to Subparts A, B, C, and D
6
Internal Revenue Service. IRS Form 2210 – Underpayment of Estimated Tax by Individuals, Estates, and Trusts
7
Electronic Federal Tax Payment System. Electronic Federal Tax Payment System
8
Internal Revenue Service. Electronic Federal Tax Payment System: A Guide to Getting Started
9
Internal Revenue Service. Direct Pay With Bank Account
10
Internal Revenue Service. Instructions for Form 2210
11
Internal Revenue Service. Instructions for Form 1041 and Schedules A, B, G, J, and K-1 (2025)