The need for individuals to increase retirement savings has been widely promoted, yet our understanding of the motivations of individuals to save at a higher rate remains sparse. This paper reports the findings of a survey of 2300 retirement savings fund members and their motivations to contribute more to savings and to actively manage their investment strategy. Utilising the theory of planned behaviour, the study reveals respondent's self-reported attitudes, subjective norms and perceptions of behavioural control account for a high proportion of the variance in behavioural intention.Contrary to expectations, the study finds that respondent's risk tolerance adds little to the prediction of behavioural intention. By contrast, perceptions of planning importance and self-assessed planning preparedness (domain knowledge) are found to exert powerful indirect influences on behavioural intentions via the perceived behavioural control construct. This novel finding confirms the relevance of planning constructs and financial literacy to an understanding of retirement savings behaviour, and establishes a need to improve levels of financial literacy in society.