Illinois has a cost of living index of 93 (national average = 100). Illinois sits close to the national cost of living average, making the rent vs buy decision fairly balanced and highly sensitive to your specific situation, timeline, and local neighborhood.
At a 3-year horizon, renting in Illinois is typically the lower-risk option because the buy premium of $964/month has not yet been offset by equity accumulation and appreciation. By year 12, cumulative equity growth and home appreciation generally surpass the total rent premium paid. Beyond 12 years, buying in Illinois historically delivers stronger financial outcomes for most households.
Illinois has a state income tax of 4.95% flat. The mortgage interest deduction (federal) can reduce the effective cost of buying, particularly in the early years when interest makes up the bulk of your mortgage payment. Consult a tax professional to understand how Illinois's state tax rules interact with your overall housing deductions.