This chapter outlines three pragmatic approaches for measuring and attributing tax compliance outcomes through revenue metrics. These revenue outcomes relate to collecting the right tax at the right time. The focus is less on taxpayers’ behaviour and more on getting the right tax result. This is often expressed as maximising tax revenues or closing the tax gap. These approaches are not exhaustive but draw attention to some of the best current and emerging practice for revenue bodies to consider, drawn from a survey of the OECD Forum on Tax Administration membership.