Since 1998 Percy Allan & Associates has undertaken assignments for the following organisations:
- NSW Treasury
- Victorian Department of Treasury and Finance
- Macquarie Bank
- Sydney Water
- Pro Tech Steel
- Arthur Andersen
- ICM Australia
- NSW Independent Pricing and Regulatory Tribunal
- Tyndall Australia
- Department of Industry Science and Resources
- The TCFL Design and Technology Centre ACIL Australia
- NSW Public Works and Services Department
- Commonwealth Department of Finance and Administration
- Surfboard Financial Securities AusAID
- Egis Consulting Australia
- Chinese Ministry of Personnel
- Chinese Ministry of Finance
- World Bank
- Mediate Today
- Ecocell Silverbats
- South Sydney Council
- Woollahra Municipal Council
- TriTel Australia
- Indonesian Ministry of Finance
- Aluminium Foil Insulation Association
- State Government of Karnataka (India)
- Chinese State Commission Office for Public Sector Reform
- NSW Department of Fair Trading
- The Commonwealth Treasury
- First Cape Management
- NSW Department of Transport
- The Thai Treasury Department
- International Monetary Fund
- Macquarie University Council
- Northern Territory Treasury Department
- Northern Territory Chief Minister’s Office
- National Ministerial Council on Consumer Affairs
- Macquarie Bank
- Sydney Water
- Pro Tech Steel
- Arthur Andersen
- ICM Australia
- Tyndall Australia
- The TCFL Design and Technology Centre
- University of NSW/ Department of Textile Technology
- NSW Independent Pricing and Regulatory Tribunal
- Department of Industry Science and Resources
- GHD
- PDP Australia
- Mediate Today
- World Bank
- The TCFL Design and Technology Centre
- NSW Public Works and Services Department
- The Commonwealth Department of Finance and Administration
- ACIL Australia
- Egis Consulting Australia
- Chinese Ministry of Finance
- AusAID
- Republic of Kazakhstan
- Asian Development Bank
- International Monetary Fund
- Indonesian Ministry of Finance
- Indian State Government of Karnataka Dept. of Finance
- Chinese State Commission on Public Sector Reform
- NSW Local Government and Shires Associations
- Bega Valley Shire Council
- Commonwealth Secretariat, London (UK)
- Great Lakes Council
- NSW Electoral Commission
- Dubbo City Council
- Review Today Pty Ltd
- Horsham Rural City Council
- Wollongong City Council
- Dexia Credit Local Asia Pacific
- Armidale Dumaresq Shire Council
- Commonwealth Public Services Commissioner
- NSW Department of Planning and Infrastructure,
- IPAA (NSW Branch)
- Hills Shire Council
- Albury City Council
- The Urban Taskforce
- Greater Taree City Council
- Sutherland Shire Council
- Alliance of Sydney Councils
- Riverina Regional Organisation of Councils
- Australian Habitat Studies (AusHS)
- Municipal Association of Victoria
- NSW Department of Planning and Infrastructure
- RESIMAC Ltd
- Coolamon Shire Council
- Dubai City Government
- NSW Office of Liquor
- Gaming and Racing
- Kyogle Shire Council
- Lane Cove Municipal Council
- Ryde City Council
- Municipality of Hunters Hill
- Newcastle City Council
- Queanbeyan City Council
- Queanbeyan-Palerang Regional Council
- NSW Department of Industrial Relations
- Kohler & Co (trading as The Constant Investor)
- Finance Sector Union of Australia
- Equinox Global Holdings (Aust)