The main change for the 2026 index is the move towards an accreditation-based model. For the first time, it will become a paid-for service, expanding its reach to include a wider range of aid and development organisations. These organisations will have the opportunity to be independently assessed, benchmarked, and formally recognised for their transparency.

The Index is open to all aid organisations that meet a set of minimum criteria:

1. Organisations engaged in international aid, development, humanitarian, climate change or related activities.
2. Organisations with an annual budget of at least $20 million and at least 50 ongoing projects, investments or programmes. Smaller organisations would have limited benefits from the process.
3. Organisations should have a formal commitment to transparency outlined in a policy or strategic document.