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Certification as a CDP

Goals of CDP Program

  • Allow individuals to demonstrate their knowledge of depreciation.
  • Provide an opportunity for members to be recognized as having met the requirements established by SDP.
  • Elevate the practice of depreciation by establishing minimum standards.
  • Keep members current and participating in the field.

Requirements for CDP Status

  • Active membership in the SDP.
  • At least 5 years of full time professional depreciation experience, at least 2 years of which must be in the area of depreciation administration. Three years experience may be in related fields such as engineering, finance, planning, regulation, and regulatory consulting. Depreciation administration comprises any of the following activities: involvement or responsibility for the preparation of depreciation studies, the review of depreciation studies, development of depreciation analysis software systems, and instruction in depreciation analysis and procedures.
  • College degree or its equivalent. Each year of practical depreciation experience equals 1 year of college equivalency. The Certification Committee recognizes career development and non-academic equivalency, e.g., courses, seminars, teaching, administrative/supervisory positions, membership in professional organizations. Documentation of all academic and non-academic experience is mandatory and must be on file at the SDP office (e.g., copy of diploma, current letter from college, transcript).
  • An application form (PDF) and an application fee of $100 must be received by SDP 20 days prior to the exam date. If a candidate is unable to attend the scheduled exam, they must notify SDP 5 days prior to the exam date or a cancellation fee of $50 may be assessed.

CDP Exam Details

  • A proctored, closed-book exam is given at each SDP Annual Meeting. The 2020 Exam will be hosted remotely due to the ongoing global pandemic.
  • The exam has two parts -- the Ethics part and the Technical part.
  • The Ethics part of the exam includes questions about the SDP Code of Ethics and the SDP Standards of Professional Conduct.
  • The Technical part of the exam includes questions in the following areas:
    • Plant and Reserve Accounting
    • Life Analysis Concepts
    • Life Analysis Using Actuarial Models
    • Life Analysis Using Simulation Models
    • Salvage and Cost of Retiring Analysis
    • Life Cycle Analysis
    • Depreciation Calculations
  • To pass the exam, a minimum score of 70% is required on the Ethics part of the exam. Additionally, a score of 70% is required on the Technical part of the exam OR on the Ethics and Technical parts combined.
  • An applicant who has twice unsuccessfully taken the exam must wait a minimum of 1 year before retaking the exam.

 Fees: (click payment option below)


The CDP Exam Consists of Two Parts

To Pass the Exam:

  • To pass, a minimum score of 70% is required on the Ethics part of the exam. Additionally, a score of 70% is required on the Technical part of the exam OR on the Ethics and Technical parts combined.

Recommended Study Material

SDP currently offers the Depreciation Systems textbook by Wolf and Fitch on our website as a gift with donations to our Education Fund, see details on our homepage. Later, we hope to also offer the Bulletins 125 and 155. The other resources can be found online, in libraries, or by reaching out directly to the publishing organization listed with the title.

  • American Gas Association (AGA) and Edison Electric Institute (EEI), Introduction to Depreciation for Public Utilities and Other Industries, 2003, AGA (, EEI (
  • Marston, Winfrey, and Hempstead, Engineering Valuation and Depreciation, Iowa State University Press, 1953.
  • National Association of Regulatory Utility Commissioners (NARUC), Public Utility Depreciation Practices, NARUC, 1996, (
  • Porter, Roper, Mason, Rossini, and Banks, Forecasting and Management of Technology, John Wiley and Sons, NY, 1991. 
  • Winfrey, Robley, Bulletin 125: Statistical Analyses of Industrial Property Retirements, 1935 as revised 1967, Iowa State University Engineering Publications and Communications Services.
  • Winfrey, Robley, Bulletin 155: Depreciation of Group Properties, Iowa State University Engineering Publications and Communications Services.
  • Wolf and Fitch, Depreciation Systems, Iowa State University Press, 1992, (


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Society of Depreciation Professionals
4 Lan Drive
Westford, MA 01886
Phone: 978-364-5195
Fax: 978-250-1117

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