The objective of this research is to prove that the auditor implement audit planning in order to perform audit service and create an audit planning according to applied auditing standards. The sample of this research is Public Accounting Firm that perform audit service to the client. Data gathering for this research comes from interview and documentation to the auditor of the Public Accounting Firm and document analysis that created by the auditor. The audit planning document comes from Public Accounting Firm that created to analyze the client to perform auditing. The result of this research is the auditor implement the audit planning to perform auditing to the client and auditor create audit planning according to applied Auditing Standards such as International Standard Auditing (ISA). Auditor created audit planning to maximize the performance of auditor when perform audit service.