Page 90 - Suncor AR English

Report on internal control over financial reporting

We have also audited Suncor Energy Inc.’s internal control over financial reporting as at December 31, 2013, based on
criteria established in Internal Control – Integrated Framework (1992), issued by the Committee of Sponsoring

Organizations of the Treadway Commission (COSO).

Management’s responsibility for internal control over financial reporting

Management is responsible for maintaining effective internal control over financial reporting and for its assessment of the
effectiveness of internal control over financial reporting included in the accompanying Management’s Report on Internal

Control over Financial Reporting.

Auditor’s responsibility

Our responsibility is to express an opinion on the company’s internal control over financial reporting based on our audit.
We conducted our audit of internal control over financial reporting in accordance with the standards of the Public

Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to
obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all

material respects.
An audit of internal control over financial reporting includes obtaining an understanding of internal control over financial

reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness
of internal control, based on the assessed risk, and performing such other procedures as we consider necessary in the

circumstances.

We believe that our audit provides a reasonable basis for our audit opinion on the company’s internal control over
financial reporting.

Definition of internal control over financial reporting
A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the

reliability of financial reporting and the preparation of financial statements for external purposes in accordance with
generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and

procedures that: (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the
transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded
as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles,

and that receipts and expenditures of the company are being made only in accordance with authorizations of
management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely

detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the
financial statements.

Inherent limitations

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also,
projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become
inadequate because of changes in conditions or that the degree of compliance with the policies or procedures may

deteriorate.

Opinion
In our opinion, Suncor Energy Inc. maintained, in all material respects, effective internal control over financial reporting as

at December 31, 2013, based on criteria established in Internal Control – Integrated Framework (1992) issued by COSO.

13FEB200801293926

Chartered Accountants
Calgary, Alberta

February 28, 2014

86 SUNCOR ENERGY INC. ANNUAL REPORT 2013