THE INTERNATIONAL INSTITUTE FOR STRATEGIC STUDIES

Registered charity 206504 · accounts filings on the Charity Commission register · also known as I I S S

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.

Causes: General Charitable Purposes · Education/training · Other Charitable Purposes · website · Get email alerts

Latest income
£31.6m
Latest spending
£29.5m
Registered
1962
Accounts read
FY2025

Financial health, per its FY2025 accounts

The accounts state that the Institute held free reserves of £11,896,000, which equated to approximately 6 months of operating expenditure, meeting the Trustees' policy target of between 3 and 6 months. Per the Trustees' report, the financial health is considered sound, with total net assets increasing to £39,417,000 and no loan liabilities at the year-end.

Automated summary of the FY2025 accounts; the evidenced findings below carry the verbatim passages.

What the accounts disclose

Reserves policy: three to six months of operating expenditure (held: £11.9m)
“the Trustees aim to hold free reserves equivalent to between 3 and 6 months operating expenditure.”
Per its FY2025 accounts as filed with the Charity Commission.
Trading subsidiary: Arundel House Enterprises Limited
“The Institute’s commercial trading subsidiary, Arundel House Enterprises Limited (AHEL), experienced much improved trading conditions” — page 14
Per its FY2025 accounts as filed with the Charity Commission.

Accounts audited by Crowe U.K. LLP. Discloses 4 of 6 completeness components.

Property (HM Land Registry)

1 registered title in England and Wales held by the charity’s company or corporate body (1 freehold). All charity-held property. Contains HM Land Registry data © Crown copyright, OGL v3.0.

Public profiles (found on the charity’s own website): facebook (93,707 followers) · instagram (30K followers)

Structured financials (annual return, FY ending 30/09/2025)

Total income
£33.7m
Total spending
£29.5m
Cost of raising funds
£67k
Reserves (reported)
£11.9m
Employees
179

Reported reserves equal ~4.8 months of spending — above the median for charities its size (median 4.6 months; benchmarks).

Per its annual return, cost of raising funds: 0.2% of total income — below the median for charities its size (3.8%) (benchmarks).

Trustees · trustee networks

Trustee list from the Charity Commission register (current, not historical).

Operates in: Bahrain · City Of London · Germany · India · Singapore · United States

Income and spending

Financial year endIncomeSpending
30/09/2025£31.6m£29.5m
30/09/2024£26.5m£25.5m
30/09/2023£25.0m£25.2m
30/09/2022£24.5m£24.0m
30/09/2021£18.4m£17.6m

Common questions

Is THE INTERNATIONAL INSTITUTE FOR STRATEGIC STUDIES financially healthy?

Per its FY2025 accounts: The accounts state that the Institute held free reserves of £11,896,000, which equated to approximately 6 months of operating expenditure, meeting the Trustees' policy target of between 3 and 6 months. Per the Trustees' report, the financial health is considered sound, with total net assets increasing to £39,417,000 and no loan liabilities at the year-end. Its FY2025 accounts were audited by Crowe U.K. LLP.

Who funds THE INTERNATIONAL INSTITUTE FOR STRATEGIC STUDIES?

Funders whose own accounts filings name THE INTERNATIONAL INSTITUTE FOR STRATEGIC STUDIES as a grant recipient include PRISM THE GIFT FUND.

Known funders

Grants to this charity found in funders’ own accounts filings.

FunderYearAmountPurpose (as stated by the funder)
PRISM THE GIFT FUNDFY2024£100kJustice and Community Development

Funders of similar charities

Funders whose accounts show grants to charities similar to this one (and no recorded grant to this charity) — a starting list for fundraisers.

Charities like this

Semantically similar by activities and financial character, from our analysed corpus. Compare with THE ROYAL INSTITUTE OF INTERNATIONAL AFFAIRS.

Side by side with its peers

CharityIncomeTop pay bandStaff >£60kReserves vs policyFundraising costGoing concern
THE INTERNATIONAL INSTITUTE FOR STRATEGIC STUDIES£31.6m——unclear—no doubt
THE ROYAL INSTITUTE OF INTERNATIONAL AFFAIRS FY2025£20.2m——unclear—no doubt
INSTITUTE FOR STRATEGIC DIALOGUE FY2024£5.2m——above—no doubt
THE ROYAL UNITED SERVICES INSTITUTE FOR DEFENCE AND SECURITY STUDIES FY2025£16.6m£170,001 - £180,000—below—no doubt
THE INTERNATIONAL INSTITUTE FOR CONSERVATION OF HISTORIC AND ARTISTIC WORKS FY2025£435k£60,000 - £69,0001above—no doubt
THE INSTITUTE FOR FISCAL STUDIES FY2024£13.1m—35above—no doubt

Each row is that charity’s latest analysed filing; every value is quote-backed on its own page.