Residency rules, sticky taxes, and first-year steps (2026)
2026.1 Edition · Revised 2026-07-25 · DomusDay Research
The move changes the rate; the record decides whether it sticks. Illinois keeps taxing until domicile actually changes — clear and convincing evidence to overcome the residency presumptions, with no fixed day threshold to hide behind. Below: what follows leavers, and the Wisconsin steps that build the record.
Who has to show it: on the taxpayer asserting the change; only one domicile at a time.
Wisconsin and Illinois reciprocity means a Wisconsin resident working in Illinois pays income tax on those wages only to Wisconsin — and the reverse. It covers wages, salaries, and commissions, not self-employment, pass-through, rental, or property-sale income. Form W-220 stops nonresident withholding.
Source ↗Wisconsin allows a deduction for 30% of net capital gain on assets held more than one year — 60% for farm assets — before applying its 3.50%–7.65% brackets. Illinois taxes capital gains in full at its flat rate; Wisconsin's exclusion narrows the gap for gain-heavy years.
Source ↗Wisconsin has no 183-day statutory residency test. Publication 122 ties full-year, part-year, and nonresident status entirely to domicile, which changes only on abandonment of the old home, acquisition of the new one, and physical presence — each shown by dated actions.
Source ↗Wisconsin is the easy half. Illinois decides whether the move counts, and it decides on evidence — the two tests below stay live until the record closes them out.
The full rules, the audit program, and every source: the complete Leaving Illinois guide →
Top-bracket rates differ by 2.7%: Illinois at 4.95%, Wisconsin at 7.65% — an illustration at the top marginal rate, not an effective-rate calculation.
The first weeks in Wisconsin matter more than they look: each step below produces a dated document, and dated documents are what answer a Illinois examiner years later. Do them early and the record starts on your side of the timeline.
New residents with an out-of-state license apply for a Wisconsin driver license within 60 days of establishing residency (30 days for a commercial license).
Source ↗Vehicles are titled and registered in Wisconsin upon establishing residency, with Wisconsin plates displayed to operate on state roads.
Source ↗Voter registration is available online or by mail up to 20 days before an election, in person at the municipal clerk's office until the Friday before, or at the polling place on election day — each registration requires a proof-of-residence document.
Source ↗Wisconsin has no declaration-of-domicile instrument to record; Publication 122 looks to actions showing intent — the license, registration, voter, and filing records above — plus physical presence in the new home.
Source ↗The homestead credit — a property tax/rent credit claimed on Schedule H — requires legal Wisconsin residency for the entire year and 2025 household income under $24,680, so an arrival-year mover generally first qualifies the year after the move.
Source ↗Wisconsin's homestead exemption makes $75,000 of an owner-occupied homestead exempt from execution and from the lien of every judgment by statute — no recording or filing creates it.
Source ↗Wisconsin requires liability insurance of $25,000 for injury or death of one person, $50,000 for more than one person, and $10,000 for property damage on registered vehicles.
Source ↗A mover who keeps an Illinois employer updates state withholding after the domicile change: under the reciprocity agreement, wages are taxed by the resident state only, so a new Wisconsin resident's Illinois wages shift to Wisconsin reporting.
Source ↗The arrival year is filed on Form 1NPR, the nonresident and part-year resident return, splitting income at the domicile change date.
Source ↗Publication 122 is the department's residency guidance: full-year, part-year, and nonresident status all turn on domicile, and a change requires abandonment of the old domicile, acquisition of the new one, and physical presence — each shown by actions.
Source ↗Everything Wisconsin asks of a new resident, on its own plate: the Moving to Wisconsin guide →
Every rule on this page traces to a statute, regulation, or agency publication, listed in full on each state's own plate.
Wisconsin. Under the Illinois–Wisconsin reciprocity agreement, wages, salaries, and commissions are taxed by the resident state only, so after the domicile change those wages are reported on the Wisconsin return. The agreement covers only employee compensation — self-employment, pass-through, rental, and property-sale income follow normal sourcing rules.
Wisconsin uses four brackets — 3.50%, 4.40%, 5.30%, and a 7.65% top rate — where Illinois uses a single flat rate. Wisconsin deducts 30% of long-term capital gains (60% for farm assets) before the brackets apply, and has no estate tax (deaths after 2007) or inheritance tax (deaths after 1991).
From the domicile change date — there is no day-count test. Publication 122 requires abandonment of the old domicile, acquisition of the new one, and physical presence, each shown by actions: the 60-day license exchange, vehicle registration, voter registration, and the Form 1NPR part-year return splitting the arrival year.
2026.1 Edition · Revised 2026-07-25 · DomusDay Research