This paper explores causes of differences in estimates of poverty incidence in Uganda since the early 1990s as measured by the Uganda Bureau of Statistics and the World Bank. While both sets of estimates from the two organisations show a declining trend in poverty incidence there are important differences in the levels of poverty, the speed of the decline and the direction of change in the early 2000s. Methodological differences linked to the determination of the poverty line and adjustments for household composition are found to play a role. Assessing the effect of other potential causes is complicated by limitations in the World Bank's meta-data.