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Forecasting the cost of spending in a hotel is one of the keys to the income management system, so far researchers have always tried to predict hotel revenues, and have never tried to forecast expenses. In this study, researchers tried to forecast expenditure costs on hotels that refer to inflation. This study aims to determine the forecasting of costs incurred in hotels with the ARIMA method . The data used in this study are data on expenditure cost from January 2014 to january 2019. Data obtained by means of the documentation method by collecting data and literature. this method was chosen because of the suitability of the number and pattern of existing data. according to preliminary research researchers ARIMA method is suitable for forcasting this data. that means using ARIMA method will bring a good data forcast that can make a good analysys for company.