The United Nations (UN) operates on a dual funding model: assessed contributions and voluntary contributions. Assessed contributions are mandatory dues determined by the UN's scale of assessments, which considers factors like Gross National Income (GNI) and population size. Voluntary contributions are non-mandatory and are provided by member states, international organizations, private sector entities, and philanthropic donors.

In 2022, the United States was the largest contributor, providing 22.0% of the regular budget. China followed with 12.0%, and Japan contributed 8.03%. Other significant contributors included Germany, France, and United Kingdom. Relative to their economies, Norway and Sweden stand out, each contributing approximately 0.3% of their GNI to the UN. This level of contribution is notably higher than that of larger economies.

The UN's funding structure ensures that wealthier nations contribute proportionally more, while developing countries pay significantly less. This system aims to maintain fairness and equity in the distribution of financial responsibility among member states. In addition to member state contributions, the UN also receives funding from other sources, including private sector entities and philanthropic donors. These voluntary contributions play a crucial role in supporting the UN's various programs and initiatives.