The Accounting Division prepares and manages the County’s annual financial statements according to generally accepted accounting principles and state statute. Accounting works with departments to provide financial review and reporting, and to assure accuracy of data. Also, the division assists departments in managing payments to vendors when obtaining goods and services for the County, as well as monitor and audit these payments for pricing, accuracy and compliance with County policies and procedures, and State and Federal laws.

Sign Up for Electronic Payments From the County

Suppliers and vendors can get payments quickly from Lake County by signing up for electronic payments! Fill out this W-9 Supplier Registration Form (PDF) and return with a voided check by email or fax it to 847-984-5780. Instructions for W-9 Supplier Registration Form (PDF).

Comprehensive Annual Financial Report

As required by Illinois State Statutes, Lake County has an independent audit completed annually and publishes the statements. This audit is prepared in conformity with generally accepted accounting principles and according to government standards issued by the Comptroller General of the United States. Lake County presents these statements in a Comprehensive Annual Financial Report (PDF), that also includes supplementary information, as required by the Government Accounting Standards Board.

Take a look at this year's and past year's Comprehensive Annual Financial Reports.


In an effort to enhance transparency about its budget and expenditures, Lake County government posts monthly check registers that show payments for all goods and services. Lake County also posts annual expenditures by vendor. The reports show payments for all goods, services, and/or reimbursements during the County's fiscal year.