This study is published within the UNU-WIDER project Fiscal states-the origins and developmental implications, which is part of the Domestic Revenue Mobilization programme. The programme is financed through specific contributions by the Norwegian Agency for Development Cooperation (Norad).

The main argument of this paper is that there is considerable heterogeneity in the way aid can shape tax performance in developing countries: through behavioural effects, donor conditionality, recipient policy reform and technical assistance; and these effects are countryspecific. We investigate these effects by applying the dynamic Common Correlated Effects Mean Group estimator to a dataset comprising 84 developing countries from 1980 to 2013. The following results ensued: aid and taxes comprise an equilibrium relation, with a positive long-run association between aid and taxes; causality runs from aid to taxes, suggesting that on average, changes in aid induce permanent changes in taxes.

This paper contributes to research on the institutional determinants of tax capacity using annual data from 39 sub-Saharan African countries from 1985 to 2018 to construct a measure of tax capacity for each country based on the trend component of the ratio of actual to potential tax revenue. Potential revenue is estimated by a parsimonious tax performance specification, including only variables found to be robust determinants of the tax/GDP ratio. The results show that, on average, tax capacity is high (given potential) and has improved over time (especially for low-income countries). The final stage of analysis selects, from a wide variety of economic and institutional variables, the most important determinants of cross-country variation in tax capacity. Equal distribution of resources is the most important institutional factor associated with greater capacity, consistent with perceptions of equity supporting the fiscal bargain; corruption is associated with lower capacity, consistent with undermining trust in government. Private consumption and resource rents are associated with greater capacity. Other institutional factors are indirectly associated with greater capacity, such as accountability and elements of democracy associated with equity in the allocation and use of public resources.

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We argue that tax revenues and political institutions placing constraints on the executive power may reinforce each other over time and so co-evolve in the long run. This may also bring a shift in the composition of revenues, from taxes levied on a narrow base to broadly levied taxes. To test these hypotheses, we use historical cross-country data covering 31 countries for 1800–2012 and panel time series methods allowing for different forms of country-specific heterogeneity and cross-section dependence. The results offer three main findings. First, executive constraints, whether they are judicial or legislative, and tax revenues are cointegrated. While in the short run they can drift apart, this will be temporary because there is a long-run relationship between the two. Second, evidence of cointegration is strongest for revenues from direct taxes, suggesting that the existence and nature of a long-run relationship may be mainly related to the emergence of broad-based taxation. Third, long-run causality runs mostly from executive constraints to taxation. This is most evident for income taxes. Our findings link Sustainable Development Goals 16 and 17, implying that the goal of promoting inclusive and accountable institutions may work in synergy with that of generating internal resources to finance development goals.