Oldenburg Accountants & Advisors is a boutique CPA firm based in Grayslake, IL, serving small and medium-sized businesses as well as individuals with high income and complex tax situations. The firm supports clients with accounting, tax, and advisory needs, with services available in person and remotely.

Its work includes business and individual tax preparation, tax planning, bookkeeping, payroll processing, financial statements, and help with IRS notices and audits. The firm also lists support for accounting software and uses IRIS myPay Solutions for payroll-related needs.

Client-facing services are especially relevant for small businesses, medium-sized businesses, and individuals seeking organized accounting records, tax compliance support, and planning around business finances.