Background: Mental health accounts for an estimated 14% of the global disease burden yet receives less than 2% of health budgets in most countries, with even lower investment in low- and middle-income settings. This study examines federal mental health financing trends from 2021-2025 to assess whether legislative reform translated into fiscal prioritization. Methods: A mixed-methods policy analysis was conducted, combining quantitative analysis of federal budget appropriation documents (2021-2025) with qualitative documentary review and comparative case studies. Mental health allocations were assessed by recurrent and capital expenditure, institutional distribution, and proportional share of total federal health spending. WHO reports, national policy documents from Ghana and Kenya, and peer-reviewed literature informed comparative analysis. Results: Federal mental health allocations increased from ₦23.33 billion in 2021 to ₦88.24 billion in 2025, a 278% nominal rise. However, the sector’s share of the total health budget declined from 3.67% to 3.12%, indicating relative marginalization. Over 90% of funding supported recurrent expenditures in ten federal neuropsychiatric hospitals, with minimal investment in community-based services or primary care integration. In contrast, Ghana and Kenya more effectively leveraged legislation, fiscal decentralization, and insurance mechanisms to expand access. Conclusion: Despite legislative reform, Nigeria’s mental health financing remains centralized, hospital-focused, and misaligned with population needs. Institutional inertia, weak coordination, and delayed implementation of the Act have constrained equitable scale-up. Activating the Mental Health Fund and integrating mental health into national financing mechanisms are urgently required to prevent deepening inequities.
King et al. (Wed,) studied this question.