A Field Research Report Submitted to Mzumbe University in Partial Fulfillment of the Requirement for the Award of the Bachelor Degree of Accounting and Finance in Business Sector (Baf-Bs) of Mzumbe UniversityThe project aimed at assessing the effectiveness of computerized accounting systems on financial reporting, using Tanganyika Wattle Company Ltd (TANWAT) as a case study. The specific objectives of the study focused on assessing the extent to which TANWAT has adopted computerized accounting system in their financial reporting, assessing the effect of CAS on the quality of the financial reports, assessing the time used by TANWAT in financial reporting with CAS as well as assessing the challenges faced by TANWAT on using CAS in financial reporting. A case study design with both primary and secondary data collection methods was used to make sure the intended objective is achieved. The targeted population was the TANWAT organization’s employees whereby the sample of 16 people was selected while focusing on those with accounting and finance knowledge. The study findings show that the use of computerized accounting systems enhances the quality of financial reports in terms of accuracy, understandability, reliability, and materiality. It also show that with CAS, financial reporting is said to be done quickly hence reducing time consumption to the organization as well as enhancing timely decision making by the information users. Though there are some challenges facing accountants when using this CAS in recording and processing transactions. For example, the issue of system failure may cause delays and loss of work, also the lack of enough experience on CAS usage is a challenge. Therefore, the organizations have the responsibility of training their accountants to make them aware of the use of CAS effectively. Also they should be practicing frequently backups to avoid too much loss of data when there is system failure caused by power breakdown. This work is organized into six chapters such as; an introductory chapter, Literaturereview, Research methodology, Presentation of findings, discussion of findings, andthe last one being the conclusion and recommendations as well as area for furtherstudy, followed by references and appendices.