Iowa Fiduciary Income Tax Return (IA 1041): What It Is, When You File, and How to Get the Certificate of Acquittance

Most executors know they need to file the deceased person's final federal and Iowa income tax returns. Many don't realize the estate itself is a separate taxpayer — one that requires its own return if it earns income during the administration period.

That return is the Iowa Fiduciary Income Tax Return (IA 1041). Missing it, or filing it incorrectly, can delay the estate closing by months.

What Triggers the IA 1041 Requirement

When a person dies, the estate becomes a distinct legal entity for tax purposes. Any income generated by estate assets after the date of death — interest from bank accounts, dividends from stocks, rental income from property, proceeds from asset sales — belongs to the estate, not to the deceased.

An IA 1041 must be filed if the gross income of the estate for the tax year is $600 or more.

This is a low threshold. A single interest payment from a savings account, or one month of rent from a farm lease, can easily exceed $600. Estates that sit open for six to twelve months — which is typical under Iowa Chapter 633 probate — almost certainly meet this threshold.

The Iowa IA 1041 runs parallel to the federal Form 1041. Both returns must be filed for the same tax year, and Iowa requires that a copy of the federal return accompany the Iowa filing.

Iowa's Flat Tax Rate for Estates

Iowa has simplified its income tax structure significantly. For tax years 2025 and 2026, the Iowa fiduciary income tax rate is a flat 3.8%.

This means that whatever taxable income the estate reports — after deductions and distributions to beneficiaries — is taxed at a single 3.8% rate. There are no brackets, no graduated rates, and no guesswork about which rate applies.

Iowa-specific modifications affect the calculation:

• Interest received from federal government securities (U.S. Treasury bonds, for example) is subtracted from federal taxable income for Iowa purposes
• Interest from out-of-state municipal bonds, which is excluded for federal purposes, must be added back for Iowa purposes

These adjustments typically require a few line-item calculations but are not complex.

Due Date for the IA 1041

The Iowa fiduciary return is due on the 15th day of the 4th month following the close of the estate's tax year.

For estates using a calendar year (January 1 through December 31), that means the IA 1041 is due April 15 (or April 30 if Iowa provides its standard extension to the 30th — confirm current-year rules with the Iowa Department of Revenue).

Estates can elect a fiscal year rather than a calendar year. This is sometimes advantageous for timing income recognition and distributions. The due date shifts based on the fiscal year end.

An extension of time to file is available. However, an extension to file is not an extension to pay — if the estate owes tax, the estimated amount must be paid by the original due date to avoid penalties and interest.

Electronic Filing Requirements

Iowa requires electronic filing (via Modernized e-File, or MeF) for estates that have:

• At least $250,000 in gross receipts, or
• 10 or more Schedule K-1s to issue to beneficiaries

Below these thresholds, paper filing is permitted, though electronic filing is strongly encouraged by the Department of Revenue.

For most small to mid-size Iowa estates, paper filing is an option. For larger estates or those distributing income to multiple beneficiaries, electronic filing through a CPA or tax preparer with MeF access is the practical route.

Distributions to Beneficiaries and Schedule K-1

When the estate distributes income to beneficiaries during the tax year, that income is deductible on the IA 1041. The tax liability passes through to the beneficiaries. The estate issues each beneficiary a Schedule K-1 showing their share of the distributed income.

Each beneficiary then reports that K-1 income on their individual Iowa income tax return (IA 1040) at the 3.8% flat rate.

If the estate distributes nothing and retains all income during the tax year, the estate pays tax on the full amount at 3.8%.

Non-resident beneficiaries: If the estate has beneficiaries who are not Iowa residents, it may need to file an Iowa Composite Return (IA PTE-C). The estate pays composite tax on the non-resident's share of Iowa-source income at 3.8%, rather than requiring each non-resident beneficiary to file an Iowa return individually.

The Income Tax Certificate of Acquittance

This is the most important function of the final IA 1041 filing — and the piece that most executors don't know about until they're trying to close the estate.

Iowa probate courts will not allow an estate to close — and will not discharge the executor — until the Iowa Department of Revenue certifies that all of the decedent's and estate's income tax liabilities have been satisfied. That certification is called the Income Tax Certificate of Acquittance.

How to request it: On the final IA 1041, check the box indicating that it is the "Final" return and that the executor is requesting the Certificate of Acquittance. This checkbox serves as the formal application. The Department of Revenue reviews it, confirms no outstanding tax issues exist, and mails the certificate to the fiduciary or their designated Power of Attorney.

If there are unresolved tax issues — a prior unfiled return, an outstanding balance from the decedent's individual returns, or questions about the IA 1041 itself — the Department of Revenue will not issue the certificate until those issues are resolved.

Practical implication: File the final IA 1041 before you expect to close the estate. Leave time for the Department of Revenue to process and issue the certificate. Trying to schedule a court hearing to close the estate and simultaneously waiting on the certificate is a common reason estate closings get delayed.

How the IA 1041 Relates to the Decedent's Final IA 1040

These are two separate returns:

Decedent's final IA 1040: Covers income the deceased person earned from January 1 of the year of death through the exact date of death. This is filed using the decedent's Social Security Number. If there is a surviving spouse, they may elect to file jointly for the year of death.

Estate's IA 1041: Covers income generated by estate assets after the date of death, reported under the estate's Employer Identification Number (EIN). The estate's first tax year begins on the date of death.

Both returns must be filed and all balances paid before the Certificate of Acquittance will be issued. If the decedent had unfiled returns from prior years, those must also be resolved.

Getting the EIN for the Estate

Before filing the IA 1041, the executor must obtain an Employer Identification Number (EIN) for the estate from the IRS. The estate cannot use the deceased person's Social Security Number.

Apply for the EIN online at irs.gov at no cost. The process takes about 15 minutes and the EIN is issued immediately. Beware of third-party websites that charge fees for this free service.

Use the estate's EIN to open a dedicated estate checking account. Never co-mingle estate funds with personal funds.

Common Mistakes on Iowa Fiduciary Returns

Waiting until the estate is almost closed to file. The final IA 1041 triggers the Certificate of Acquittance process. If you wait until you're ready to distribute and close, you'll wait even longer for the certificate.

Failing to attach the federal 1041. Iowa requires a copy of the federal return. Missing it can prompt a request for additional information that slows processing.

Not electing a fiscal year when it would be advantageous. If the estate will be open for more than 12 months, a CPA can help determine whether a fiscal year election defers income and reduces tax.

Not issuing K-1s to beneficiaries. If the estate distributed income, each beneficiary needs a K-1. They cannot file their individual returns without it.

The Iowa Final Tax & Estate Tax Guide walks through the complete IA 1041 process alongside the full estate settlement timeline — including how to sequence the fiduciary return, the Certificate of Acquittance, and the final probate accounting so the estate closes cleanly and on schedule.

Summary

The Iowa IA 1041 is due whenever an estate earns $600 or more in gross income during the tax year. It's taxed at a flat 3.8%. The final return triggers the Certificate of Acquittance process — the single document Iowa probate courts require before they will close the estate and discharge the executor. File the final return early, allow processing time, and confirm all individual income tax issues are resolved to avoid delays.

See more Iowa guides →