The roots of PT Amalgamated Consulting Indonesia (ACI) go back to the accounting firm established by Basuki T. Siddharta in 1957. ACI evolved from the reorganisation of one of the Indonesian "Big 4" accounting firms, which spun off its accounting, payroll, secretarial and establishment services 20 years ago. They subsequently added a broad range of tax and advisory services. Many of their employees were previously with "Big 4" accounting firms, including Istama T. Siddharta. This means that their clients benefit greatly from the many years of experience and in-depth knowledge of local and international financial and tax business planning and strategies, as well as of Indonesian accounting and tax requirements. PT Amalgamated Consulting Indonesia also has a Japan Business Desk, headed by Koji Shima, President Commissioner, and provides professional services to a significant number of Japanese companies with Indonesian operations. The firm provides efficient and effective outsourcing and professional advisory services to a large number of entities, both large and small.