The problem addressed is the lack of clarity regarding the impact of political behaviour on the funding mechanisms of political parties and the broader implications for governance in Nigeria. This study examines the dynamics of political behaviour and the funding of political parties in Nigeria, with a focus on how political actions and party financing interact to influence democratic processes. Anchored in the Rational Choice Theory of political behaviour, as introduced by Anthony Downs in An Economic Theory of Democracy (1957), the study explores how individuals and political parties make strategic decisions based on perceived benefits and costs. The content analysis method was employed to critically examine relevant literature, political campaigns, and party financing strategies within the Nigerian political context. Findings reveal that political behaviour significantly impacts the source and allocation of funds, with party funding often influenced by the pursuit of power and political patronage. Furthermore, political financing is characterised by a lack of transparency and accountability, leading to potential corruption. Based on these findings, recommendations are proposed: first, a need for stricter regulations and transparency in party financing to ensure fair competition and reduce the influence of money in politics; second, the promotion of political behaviour that prioritises democratic values over individual gains, thereby fosters more inclusive and accountable political processes.