THE INTERNATIONAL INSTITUTE FOR STRATEGIC STUDIES
Activities
As described by the charity on the register
The IISS aims to provide, from an international perspective, the best objective information on military and political developments and to assist in conflict resolution through the conduct of dialogues and conferences, research and publications. Its mission is to promote the adoption of sound policies to further global peace and security and maintain civilised international relations.
Latest income
£31.6m
Expenditure
£29.5m
Financial year end
2025-09-30
Income & spending history
As reported to the Charity Commission, by financial year end
| Year end | Income | Expenditure | |
|---|---|---|---|
| 2021-09-30 | £18.4m | £17.6m | |
| 2022-09-30 | £24.5m | £24.0m | |
| 2023-09-30 | £25.0m | £25.2m | |
| 2024-09-30 | £26.5m | £25.5m | |
| 2025-09-30 | £31.6m | £29.5m |
Latest detailed return
Year end 2025-09-30 · consolidated (group) figures
Income mix
| Donations & legacies | £5.8m |
| Charitable activities | £24.5m |
| Trading | £2.5m |
| Investment income | £465k |
| Total income | £33.7m |
Spending
| Charitable spend | £27.8m |
| Raising funds | £67k |
| Grants to institutions | £0 |
| Governance | £202k |
| Total expenditure | £29.5m |
Balance sheet
| Reserves | £11.9m |
| Total funds | £39.4m |
| — restricted | £26k |
| — unrestricted | £25.3m |
| — endowment | £14.1m |
| Total assets | £39.4m |
| Cash | £9.0m |
People
| Employees | 179 |
Classification
The charity's own register classification
What it does
- General Charitable Purposes
- Education/training
- Other Charitable Purposes
Who it helps
- Other Defined Groups
- The General Public/mankind
How it works
- Provides Advocacy/advice/information
- Sponsors Or Undertakes Research
Source: Charity Commission for England and Wales register, 2026-07-28. Detailed figures as filed in the charity's annual return. Contains public sector information licensed under the Open Government Licence v3.0.