The need for efficient account management is critical because it gives an additional advantage to strategic information management. Accounting systems for legal firms involving distinct business processes and practices with client records and a reasonably detailed account of its own. Although currently there is a lot of accounting software locally and internationally, however, it is not appropriate to the needs of world-class firms, small and medium enterprises (SMEs), especially in terms of size, scope and cost. Majority of them manage the account by themselves such as manually record keeping or non-integrate system. Therefore, it is not surprising when the legal practitioner SMEs have difficulties in managing their account. Computerized Accounting Information Systems (CAIS @ Law) is proposed as a web service to help SMEs firms in managing financial transactions, performance monitoring firm, statements of cash flows and inflows out customer's account and the auditing process. Business process requirements have been identified, namely using web services oriented architecture through the virtual server. It requires a basic operating system, easy and reduced cost and customizable and easy to operate. This system can provide sufficient material for submission to the Bar Council as proof of the account as well as the use of a variety of clients and SME sector scale. The developed prototype successfully employed by local SMEs and shows competitive features with dynamics customization ability based on the capacity of the firm.