The Philippines enters its 2026 budget cycle navigating a complex landscape of stable domestic growth set against significant global uncertainties and mounting fiscal pressures. This budget note provides a comprehensive assessment of the macroeconomic and fiscal assumptions underpinning the proposed 2026 National Government Budget, evaluating their credibility, vulnerabilities, and policy implications. It critically examines key parameters including GDP growth, inflation, the revised Medium-Term Fiscal Framework, revenue and expenditure programs, the fiscal balance, and the national debt trajectory. The note finds that government assumptions are cautiously optimistic, taking into account the inherent risks associated with downgraded revenue targets, widening fiscal deficit, and the rise in debt servicing that crowds out productive spending. Achieving fiscal sustainability and the budget's development goals is presented as contingent on strengthening revenue mobilization, managing expenditure pressures, and implementing structural reforms to build resilience against domestic and external shocks.