<![CDATA[Purchasing administration plays a vital role in ensuring procurement effectiveness and financial management efficiency. However, reliance on manual systems often leads to data inaccuracies and barriers to information access. This study aims to analyze the contribution of purchasing administration to financial efficiency through a case study of PT Indo Bismar Surabaya, which still implements a manual system and is transitioning to digital. Using descriptive qualitative methods, data collection was conducted through participant observation, in-depth interviews, and documentation of stock recapitulation, Purchase Order (PO) management, profit and loss statement preparation, and archiving activities. The research findings indicate that routinely organized administrative governance significantly improves cost transparency and purchasing budget control. Although manual systems still dominate, initial efforts to digitize documents have proven to accelerate information access and reduce the need for archive space. It is concluded that optimizing purchasing administration is a key element in financial efficiency, and therefore recommends a transition to an integrated digital system to maximize the accuracy, speed, and accountability of future procurement processes. ABSTRAK Administrasi pembelian memegang peranan vital dalam menjamin efektivitas pengadaan dan efisiensi pengelolaan keuangan, namun ketergantungan pada sistem manual sering kali memicu ketidakakuratan data dan hambatan akses informasi. Penelitian ini bertujuan menganalisis kontribusi administrasi purchasing terhadap efisiensi keuangan melalui studi kasus pada PT Indo Bismar Surabaya yang masih menerapkan sistem manual dan transisi digital. Dengan menggunakan metode kualitatif deskriptif, pengumpulan data dilakukan melalui observasi partisipatif, wawancara mendalam, dan dokumentasi terhadap aktivitas rekapitulasi stok, pengelolaan Purchase Order (PO), penyusunan laporan laba rugi, serta pengarsipan. Temuan penelitian menunjukkan bahwa tata kelola administrasi yang terorganisir secara rutin mampu meningkatkan transparansi biaya dan pengendalian anggaran pembelian secara signifikan. Meskipun sistem manual masih mendominasi, upaya awal digitalisasi dokumen terbukti mempercepat akses informasi dan mereduksi kebutuhan ruang arsip. Disimpulkan bahwa optimalisasi administrasi purchasing adalah elemen kunci dalam efisiensi keuangan, sehingga direkomendasikan transisi menuju sistem digital terintegrasi guna memaksimalkan akurasi, kecepatan, dan akuntabilitas proses pengadaan di masa depan. ]]>
