Established in 1971, McMahon & Associates has been serving Northwest Indiana and Chicago’s South Suburbs to help them grow their business. McMahon & Associates is locally-owned and offers a unique blend of big firm services and small firm care. From advanced tax expertise, IRS representation, audits, business valuations, estate planning and succession planning to basic bookkeeping and payroll services, clients find the services they need for every stage of their business or every stage of life.