What to know before you go
Illinois does not recognise the International Driving Permit
CriticalMany countries' guidance tells you to get an IDP before moving. Illinois explicitly does not recognise it, and it will not help you here — the state recommends carrying one only so your home licence is translated into English. You get 90 days on a valid foreign licence, then you need an Illinois one, and you must surrender every out-of-state licence and ID you hold before Illinois will issue.
A flat 4.95% state tax and no city income tax
CriticalIllinois taxes income at a single flat rate regardless of what you earn — the state constitution requires a flat tax, and a 2020 attempt to change it was rejected at referendum. Chicago levies no city income tax, unlike New York or Philadelphia. For a high earner this is one of the better big-city tax positions in America; for a low earner it is worse than a progressive system would be.
Property tax is the sting, and Cook County reassessments move fast
CriticalIllinois has some of the highest effective property tax rates in the country, and Cook County reassesses on a three-year cycle that can move a bill sharply in a single year. If you rent, it reaches you through the rent. If you buy, look up the property's actual tax history on the Cook County Assessor's site — not an estimate — before you make an offer.
Apply for your Social Security number about ten days after arriving
CriticalSSA verifies your status against DHS records that lag entry by one to two weeks, so an immediate visit usually wastes the trip. Only work-authorised people qualify; everyone else files IRS Form W-7 for an ITIN. The card is free.
Winter is the real thing and it lasts
ImportantJanuary and February regularly sit below -10°C with wind off the lake making it feel far worse, and snow can arrive from November through March. This is not the mild cold of a European winter — it requires an actual coat, boots with grip, and a mental adjustment. The compensation is that Chicago summers are genuinely excellent and the city lives outdoors for four months.
You probably do not need a car
ImportantChicago has the second-largest rail transit system in the US, an almost perfectly flat grid, and a numbered street system that makes navigation trivial once you learn it. Between the L, the buses and the lakefront trail, large numbers of residents go without a car — which given winter parking, dibs and Cook County vehicle costs is a sensible choice.
Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.