This bill recreates a Wisconsin estate tax by repealing and replacing chapter 72 and imposing a tax on the value of a decedent’s Wisconsin taxable estate for deaths on or after the act’s effective date (Nov. 1, 2026). The tax base is the decedent’s federal gross estate (excluding out-of-state situs property), reduced by specified federal estate tax deductions and a new qualifying farmland exclusion.
The tax uses a four-tier, graduated structure that is mechanically tied to two federal numbers: the highest federal marginal estate tax rate and the federal basic exclusion amount. The measure also builds in administration rules—returns due nine months after death, a 12% interest rate on unpaid tax, modest filing penalties, personal liability for personal representatives and trustees, confidentiality protections, and an interstate arbitration process for residency disputes—so estates and advisors must adjust probate and cash-flow planning.
At a Glance
What It Does
Establishes a state estate tax on Wisconsin-situs property by taxing the Wisconsin taxable estate (federal gross estate less enumerated IRC deductions and a farmland exclusion). It sets a four-tier rate schedule linked fractionally to the federal top rate and ties thresholds to the federal basic exclusion amount. Returns are generally due nine months after death and payment is due when the return is filed.
Who It Affects
High‑net‑worth decedents with property in Wisconsin, personal representatives, trustees, and heirs who inherit Wisconsin‑situs assets; family farmers who may qualify for the farmland carve‑out; and the Department of Revenue, which gains collection, audit, and arbitration duties.
Why It Matters
The bill reintroduces a state-level transfer tax in a form that imports federal parameters, creating revenue for the state while preserving a significant carve‑out for family farms and reintroducing compliance burdens—valuation, cash‑flow, and potential recapture—into estate administration in Wisconsin.
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What This Bill Actually Does
The bill defines the Wisconsin taxable estate as the decedent’s federal gross estate (the IRC section 2031 construct) but removes assets whose situs is outside Wisconsin. It then reduces that figure by certain federal estate tax deductions (sections 2053–2056 of the IRC), even if the estate did not claim those deductions on a federal return.
After those adjustments the remaining value is the Wisconsin taxable estate subject to the state tax.
Rather than a single flat rate, the tax is tiered. The bill links thresholds to the federal basic exclusion amount and sets rates as fixed fractions of the federal top estate tax rate; using current federal law (a $15,000,000 exclusion and a 40% top rate) the effective brackets are 0% for the first third of the federal exclusion, 6.67% for the next third, 13.33% for the next third, and 20% on amounts at or above the full exclusion.
If the federal exclusion is reduced or repealed, the bill instructs Wisconsin to use the exclusion amount that applied in the federal year immediately before the reduction.Qualifying farmland receives a carve‑out: real property primarily used for farming and transferred to qualifying family members (or a trust for family members) is excluded from the taxable estate if its value does not exceed $15,000,000 at death and the transferees continuously hold it for at least 10 years. If that land is sold or developed within the 10‑year hold period, the estate tax is triggered on the land’s full valuation at sale or development, and payment is due within six months.On administration, the bill requires filing an estate tax return within nine months of death (with a possible six‑month filing extension upon timely request).
Payment is due when the return is filed, though estates eligible to pay a percentage of federal estate tax under IRC section 6166 can use the same installment schedule for the state tax if they notify the department. The department may require security from distributees and can collect late amounts with 12% annual interest; failure to file draws a penalty equal to the lesser of 5% of tax due or $500.
The measure reestablishes collection powers, confidentiality protections for returns, circuit court review, and an interstate arbitration panel for residency disputes.
The Five Things You Need to Know
The bill takes effect Nov. 1, 2026 and applies to transfers on deaths occurring on that effective date.
Wisconsin taxes the "Wisconsin taxable estate," defined as the federal gross estate reduced by IRC sections 2053–2056 deductions (even if not claimed federally) and excluding out‑of‑state situs property and qualifying farmland.
The rate schedule ties to federal law: 0% for amounts <1/3 of the federal exclusion, ~6.67% for 1/3–2/3, ~13.33% for 2/3–full exclusion, and ~20% on amounts ≥ the federal exclusion (these fractions are one‑sixth, one‑third, and one‑half of the federal top rate).
Qualifying farmland (≤ $15,000,000 at death) is excluded if transferred to qualifying family members and held continuously for 10 years; an early sale or development triggers tax on the full value and payment within 6 months.
Returns are due 9 months after death (6‑month filing extension available if requested timely); payment is due on filing, interest is 12% per year on unpaid tax, and the failure‑to‑file penalty is the lesser of 5% of tax or $500.
Section-by-Section Breakdown
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Definitions and situs rules
This section imports federal concepts (federal gross estate) but narrows the taxable pool by defining situs for real, tangible, and intangible property and treating certain pass‑through interests as if the decedent directly owned the underlying in‑state property. Practically, this forces estates to perform a situs analysis for each asset (real property location, usual place of tangible property, domicile for intangibles) and to value pass‑through entity holdings as if they were direct ownership for Wisconsin tax purposes.
Imposition and computation of the estate tax
This is the core tax provision: it imposes the tax on Wisconsin‑situs transfers from residents and certain nonresidents, defines the Wisconsin taxable estate (federal gross estate less specified IRC deductions and the farmland exclusion), and prescribes the tiered rate schedule tied to federal exclusion and the top federal rate. A key operational point is that the statute requires using federal definitions for valuation but allows Wisconsin to disallow foreign tax deductions under IRC 2053(d), which can change the state tax base relative to the federal base.
Farmland exclusion and recapture
The statute excludes qualifying farmland up to a $15 million value cap if transferred to family members (as defined via IRC 2032A) and held continuously for 10 years. The recapture mechanic is trigger‑based: sale or development before the 10‑year period causes the full then‑value of the land to be taxed, with a 6‑month payment deadline. That creates a deferred tax-like exception with strict holding rules and a short window for payment if the carve‑out collapses.
Filing, payment, and installment parity with federal law
This section sets a 9‑month filing deadline, authorizes a single 6‑month filing extension if requested before the due date with an estimate, and generally requires payment when filing. It preserves parity with IRC section 6166 by allowing the same percentage of tax to be paid in installments on the federal schedule if timely notice is given, but it adds a separate 12% interest rate and a department requirement that distributees provide liens or financial guarantee bonds as security when necessary.
Personal liability of fiduciaries and distributees
Personal representatives and trustees with control over estate assets are severally liable for the tax up to the clear market value of property under their control, and trustees/distributees receiving post‑death transfers are liable for the value they received. This creates direct financial exposure for fiduciaries and motivates estates to secure payment and preserve assets during administration.
Jurisdiction, interstate arbitration, confidentiality, and enforcement powers
The bill assigns jurisdiction to county circuit courts (resident decedents at county of domicile; certain Dane County jurisdiction for nonresidents), creates an interstate arbitration panel to resolve residency contests between states, and applies existing confidentiality protections to estate tax returns. It also folds in collection authorities similar to other tax statutes, allowing setoffs, liens, and standard enforcement tools—practical levers for the Department of Revenue when collecting assessments or pursuing delinquent estates.
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Every bill creates winners and losers. Here's who stands to gain and who bears the cost.
Who Benefits
- Family farmers who meet the transfer, use, value (≤ $15M), and 10‑year holding tests — they can exclude qualifying farmland from the taxable estate, reducing or eliminating state estate tax exposure and helping preserve working farms across generations.
- Estates with values below one‑third of the federal exclusion — the lowest tier is untaxed, so smaller high‑value estates that fall under that threshold avoid state tax liability entirely.
- Heirs who can utilize IRC section 6166 installment schedules — those estates that qualify for federal installment treatment may mirror that schedule for state payments, easing liquidity pressures and aligning federal/state timing.
Who Bears the Cost
- High‑net‑worth decedents and their heirs with large Wisconsin‑situs assets — the tax targets estates above fractions of the federal exclusion and will increase transfer costs for wealthy estates with in‑state property.
- Personal representatives, trustees, and distributees — fiduciaries face personal, several liability and may need to post liens or bonds to secure the tax, adding administrative burdens and potential out‑of‑pocket exposure during estate administration.
- Department of Revenue and circuit courts — the DOR must implement valuation, security, and collection procedures and support inter‑state arbitration and contested appeals, creating operational and budgetary demands that could require new staff or systems.
Key Issues
The Core Tension
The central tension is between raising revenue from large, in‑state wealth transfers and protecting working family farms and estate liquidity: the bill ties its tax to federal parameters to capture high‑value estates while offering a narrow farmland carve‑out that preserves intergenerational farms but creates lock‑in and recapture risk, forcing a trade‑off between stability for farms and flexibility (and cash) for other heirs and fiduciaries.
The bill deliberately ties Wisconsin’s tax to federal estate tax parameters (the basic exclusion and highest marginal rate). That linkage reduces the need for Wisconsin to set its own inflation indexing and brackets, but it imports federal volatility: a future federal reduction or repeal could leave Wisconsin using the prior year’s exclusion amount (the bill’s fallback), which fixes the threshold but still creates complexity when federal rates or definitions change.
Tying rates to fractions of the federal top rate also produces non‑standard bracket math (fractions of a moving target) that complicates taxpayer planning and tax software implementation.
The farmland exclusion preserves family farms but creates lock‑in and liquidity risk. The 10‑year continuous‑holding requirement with a six‑month payment obligation upon sale/development can force heirs to either retain low‑return real estate for a decade or face a large, accelerated tax bill.
Valuation disputes—what is the correct value at death versus at forced recapture—will be frequent and administratively heavy. The statute’s requirement to apply certain IRC deductions “regardless of whether the estate makes the deductions for federal tax purposes” raises questions about coordination: estates that forego federal deductions for planning reasons could still see those deductions applied for Wisconsin, producing timing and tax‑planning mismatches.
Operationally, the 12% interest rate and the personal liability rule raise practical issues: estates with illiquid assets may face both high carrying costs and fiduciary exposure. The arbitration panel for residence disputes reduces litigation risk but shifts costs into a procedural mechanism whose workload and fees could be significant.
Finally, the statute leaves open some drafting choices—how to apportion deductions between in‑state and out‑of‑state assets, standards for ‘‘primarily used for farming,’’ and how the department will calculate and demand security—all of which will determine how burdensome compliance becomes in practice.
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