For 2026, the sales tax rate in Lake County, Illinois stands at 7.25% — a combination of the 6.25% state rate and 1% local levy. The county's 700,000 residents make it an important market in the region.
For a $500 purchase in Lake County, the sales tax would be $36.25, bringing the total to $536.25.
Business Compliance in Lake County
Businesses must register with the Illinois Department of Revenue to collect and remit sales tax. Filing frequency depends on sales volume. With a population of 700,000, Lake County offers significant market potential for businesses of all sizes.