Innovation is represented by the constant pressure to reduce costs and increase revenue together with the manufacturing excellence that companies face every day. Cost accounting is a fundamental activity, essentially when it is understood that it is responsible for measuring costs for performance evaluation, inventory balancing, profit margin definition, and decision making However, cost control arises from the comparison of expectations with the results obtained, thus verifying the importance of information provided by the costing systems. This paper presents the results of the implementation of a new costing system in an SME from the nautical industry, located in the Industrial Complex of Manaus. The costing system was developed, with two proposals for imputation of manufacturing overhead costs, with a simple and intuitive format, where it is possible to relate material costs, manufacturing overhead, unit value analysis and total labor cost, administrative and commercial costs, in the order described, so that all these values are related to obtain the cost of processing.