Wisconsin Fiduciary Income Tax Return: A Guide to Form 2

When someone dies, the estate does not simply freeze in place. Assets generate interest, dividends, and capital gains while the estate is being administered. Rents come in on investment properties. Stock dividends accumulate. Executors sell the family home and the sale proceeds flow through the estate. All of that income belongs to a new, separate taxpayer: the estate itself.

Wisconsin requires that estate to file its own income tax return — the Wisconsin Fiduciary Income Tax Return, filed on Form 2. This is separate from the decedent's final individual income tax return (Form 1), separate from the federal fiduciary return (Form 1041), and separate from the Schedule CC process to close the estate. It is its own filing, with its own due dates, its own thresholds, and its own rules.

Many executors don't know it exists until the estate generates a 1099. By then, the deadline may be months away — or already past.

When Is Wisconsin Form 2 Required?

A Wisconsin resident estate must file Form 2 if it generates $600 or more in gross income during the tax year. This threshold applies to gross income before any deductions, which creates an important trap:

If an estate sells a piece of real estate for $90,000 — even if the property sells at a $10,000 net loss after commissions, closing costs, and the stepped-up basis — the gross sale proceeds of $90,000 easily exceed the $600 threshold. Form 2 is required. The fact that the estate "lost money" on the transaction does not eliminate the filing obligation.

Gross income for Wisconsin Form 2 purposes includes:

• Interest and dividends from estate bank accounts and investments
• Capital gains from the sale of estate assets (using the stepped-up basis as the cost basis)
• Rental income from estate-owned real property
• Business income from any pass-through entity owned by the estate
• Any other Wisconsin-sourced income

Nonresident estates — those where the decedent lived outside Wisconsin but owned property in the state — face the same $600 threshold if their Wisconsin-sourced income reaches that level.

When Is Wisconsin Form 2 Due?

For estates using the calendar year (January through December), Form 2 is due April 15 of the year following the close of the tax year. An estate that operates on a calendar year and generates income in 2025 has a Form 2 due date of April 15, 2026.

Estates can elect a fiscal year rather than a calendar year for income tax purposes. This can be strategically useful for timing income recognition and distributing deductions between the estate and beneficiaries. If a fiscal year is chosen, Form 2 is due on the 15th day of the fourth month following the close of the fiscal year.

For short taxable years — the first year of the estate's existence, which runs from the date of death to the end of the chosen tax period — the estate must adhere to the federal due date parameters for short-year returns.

Extensions are available. Obtaining a federal extension (Form 7004) automatically extends the Wisconsin deadline, provided any estimated tax due is paid using Wisconsin Form 1-ES by the original due date.

The Federal EIN Requirement

Before filing Form 2, the estate needs a Federal Employer Identification Number (EIN). The estate cannot use the decedent's Social Security number for its own tax filings. The EIN is obtained from the IRS — the Wisconsin DOR does not issue EINs and has no authority to do so.

The EIN is required not just for Form 2 but for every state fiduciary filing, including the Schedule CC Closing Certificate. Applying for an EIN is typically the first tax administrative step after a death, and the IRS issues them online, usually immediately.

Form 2 and Its Relationship to Federal Form 1041

Wisconsin Form 2 is built on top of the federal Form 1041 (U.S. Income Tax Return for Estates and Trusts). The income, deductions, and distributable net income calculated on Form 1041 flow directly into the Wisconsin return. For practical purposes, you cannot complete Form 2 without first completing or having access to the federal Form 1041.

This sequencing matters for professional engagements: a CPA hired to handle only the state fiduciary return is working backward if the federal return has not been drafted first. The two returns should be prepared together.

Wisconsin-Specific Rules That Differ From Federal Treatment

Several Wisconsin adjustments on Form 2 create differences from the federal return that executors should understand:

QBI deduction addback: Wisconsin did not adopt the federal Section 199A Qualified Business Income deduction created by the Tax Cuts and Jobs Act. If the estate received pass-through income from a business and claimed a QBI deduction on the federal Form 1041, that deduction must be added back on Wisconsin Schedule B of Form 2. This increases Wisconsin taxable income relative to federal.

Electing Small Business Trusts (ESBTs): If the estate holds S-corporation stock and is treated as an ESBT, the Wisconsin portion of S-corporation income is taxed at the highest marginal rate of 7.65% — regardless of the estate's overall income level.

QSSTs: Qualified Subchapter S Trusts holding S-corporation stock are explicitly required to file Wisconsin Form 2. The trust's income from the S-corporation is reported on the fiduciary return.

Tax Rates for Wisconsin Estates

Wisconsin's graduated income tax rates for estates in 2025 and 2026 range from 3.50% at the lowest income tiers up to 7.65% at the top marginal rate. For most moderately active estates — selling a home, collecting a few months of dividends — the effective rate will fall somewhere in the middle of this range depending on how much income is retained in the estate versus distributed to beneficiaries.

Income distributed to beneficiaries during the year is typically deductible to the estate and reported to beneficiaries on Wisconsin Schedule 2K-1 (the Wisconsin equivalent of the federal Schedule K-1). Beneficiaries then report that income on their personal Wisconsin income tax returns. Income retained in the estate is taxed at the estate's rates.

The Schedule CC Connection

Before the probate court will close the estate and discharge the personal representative, the Wisconsin DOR must issue a Closing Certificate for Fiduciaries — obtained by filing Schedule CC. The DOR verifies, as part of its Schedule CC review, that all required Form 2 returns have been filed and all balances have been paid.

This means that a missed or late Form 2 filing does not just create penalties — it actively blocks the estate from closing. The probate court cannot finalize the distribution of assets until the DOR confirms that fiduciary tax compliance is complete.

File Form 2 promptly for every year the estate is active. If the estate's income activity is expected to end before December 31, electing a short fiscal year can collapse the final return period and allow Schedule CC to be filed sooner.

For a complete walk-through of the Wisconsin estate administration sequence — from opening the estate through Form 2, Schedule CC, the creditor claim period, and final distribution — the Wisconsin Final Tax & Estate Tax Guide covers each step with the specific forms, deadlines, and filing addresses involved.

See more Wisconsin guides →