SDG #17 is to “Strengthen the means of implementation and revitalize the Global Partnership for Sustainable Development”
Within SDG #17 are 19 targets, of which we here focus on Target 17.1:
Strengthen domestic resource mobilization, including through international support to developing countries, to improve domestic capacity for tax and other revenue collection
Target 17.1 has two indicators:
Indicator 17.1.1: Total government revenue as a proportion of GDP, by source
Indicator 17.1.2: Proportion of domestic budget funded by domestic taxes
The countries with the highest government revenue as a share of GDP as of 2021 are Nauru (170%) and East Timor (91%). The lowest shares were in South Sudan, Ethiopia and Sri Lanka, with less than 10%. The worldwide share was 32%, up a percentage point since 2015.
The country with the highest share of its budget funded by taxes in 2021 was Denmark with 94%. The lowest share was in Iraq with 3%. The global share was 58%, down a couple percentage points from 2015.