Penelitian ini bertujuan untuk mengetahui penerapan metode Just In Time dalam efisiensi biaya persediaan bahan baku pada meubel refinsa. Metode penelitian yang digunakan adalah metode kuantitatif pendekatan deskriptif. Hasil penelitian menunjukkan bahwa peramalan permintaan furnitur terbaik adalah dengan menggunakan metode moving averages dengan tingkat error MAD sebesar 6.25, MSE sebesar 48.275 dan MAPE sebesar 19.698% serta memberikan hasil peramalan permintaan produk optimal sebesar 38 produk. Total biaya Total Inventory Cost menurut perusahaan Rp52.481.912 sedangkan menurut Economic Order Quantity sebesar Rp420.864,319 jadi ada penghematan biaya sebesar Rp52.061.047,681 dan kebijakan dari perusahaan mengakibatkan pengeluaran lebih besar yaitu Rp442.000.000,- sedangkan dengan menerapkan metode Just In
Time perusahaan mengeluarkan biaya sebesar Rp331.126.900,-. Dengan menerapkan metode Just In Time perusahaan dapat menghemat biaya pembelian dan biaya pemesanan bahan baku sebesar Rp131.737.905,9.

Kata Kunci: Just In Time (JIT), Peramalan, Persediaan, Efisiensi.

This study aimed to examine the implementation of the Just In Time (JIT) method in achieving cost efficiency for raw material inventory at Refinsa furniture. The research utilized a quantitative methodology with a descriptive approach. The results indicated that the best forecasting method of furniture demand was the moving averages method, with an error rate of MAD at 6.25, MSE at 48.275, and MAPE at 19.698%, yielding an optimal product demand forecast of 28 units. The total inventory cost, according to the company, was Rp52,481,912, while the Economic Order Quantity (EOQ) approach suggests it to be Rp420,864,319, resulting in a cost saving of Rp52,061,047,681. The company’s current policy leads to higher expenditures of Rp442,000,000, whereas implementing the Just In Time method result in a cost of Rp331,126,900. Therefore, it can be concluded that by implementing the Just In Time method, the company can save Rp131,737,905,9 in raw material purchasing and ordering costs. Keywords: Just In Time (JIT), Forecasting, Inventory, Efficiency.