TERESIANI JENI HOANG; HENDRIK SUHENDRI; SRI INDAH. Implementation of Tax Planning to Optimize Income Tax Deductions (PPh Article 21) for Employees of PT Magnum Attack Malang City. IRDH International Journal of Social Sciences & Humanities, [S. l.], v. 2, n. 3, p. 316–326, 2025. Disponível em: https://irdhjournals.com/ijsch/article/view/843. Acesso em: 11 may. 2026.