Report of Independent Registered Public Accounting Firm

To the Board of Trustees of AIM Investment Funds (Invesco Investment Funds) and Shareholders of Invesco Balanced-Risk Allocation Fund, Invesco Balanced-Risk Commodity Strategy Fund, Invesco Core Bond Fund, Invesco Discovery Mid Cap Growth Fund, Invesco EQV Emerging Markets All Cap Fund, Invesco Emerging Markets Innovators Fund, Invesco Emerging Markets Local Debt Fund, Invesco Emerging Markets Select Equity Fund, Invesco Fundamental Alternatives Fund, Invesco Global Allocation Fund, Invesco Global Infrastructure Fund, Invesco Global Strategic Income Fund, Invesco Health Care Fund, Invesco International Bond Fund, Invesco Macro Allocation Strategy Fund, Invesco Multi-Asset Income Fund, Invesco U.S. Managed Volatility Fund, and Invesco World Bond Factor Fund

In planning and performing our audits of the financial statements of the Funds listed in Appendix A (hereafter collectively referred to as the “Funds”) as of and for the year ended October 31, 2022, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), we considered the Funds’ internal control over financial reporting, including controls over safeguarding securities, as a basis for designing our auditing procedures for the purpose of expressing our opinion on the financial statements and to comply with the requirements of Form N-CEN, but not for the purpose of expressing an opinion on the effectiveness of the Funds’ internal control over financial reporting. Accordingly, we do not express an opinion on the effectiveness of the Funds’ internal control over financial reporting.

The management of the Funds is responsible for establishing and maintaining effective internal control over financial reporting. In fulfilling this responsibility, estimates and judgments by management are required to assess the expected benefits and related costs of controls. 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 (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) 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 (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of a company’s assets that could have a material effect on the financial statements.

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.

A deficiency in internal control over financial reporting exists when the design or operation of a control does not allow management or employees, in the normal course of performing their assigned functions, to prevent or detect misstatements on a timely basis. A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of the company’s annual or interim financial statements will not be prevented or detected on a timely basis.

Our consideration of the Funds’ internal control over financial reporting was for the limited purpose described in the first paragraph and would not necessarily disclose all deficiencies in internal control over financial reporting that might be material weaknesses under standards established by the PCAOB. However, we noted no deficiencies in the Funds’ internal control over financial reporting and its operation, including controls over safeguarding securities, that we consider to be a material weakness as defined above as of October 31, 2022.

This report is intended solely for the information and use of the Board of Trustees of AIM Investment Funds (Invesco Investment Funds) and the Securities and Exchange Commission and is not intended to be and should not be used by anyone other than these specified parties.

/s/ PricewaterhouseCoopers LLP

Houston, Texas

December 23, 2022

Appendix A

AIM Investment Funds (Invesco Investment Funds)

Invesco Balanced-Risk Allocation Fund

Invesco Balanced-Risk Commodity Strategy Fund

Invesco Core Bond Fund

Invesco Discovery Mid Cap Growth Fund

Invesco EQV Emerging Markets All Cap Fund

Invesco Emerging Markets Innovators Fund

Invesco Emerging Markets Local Debt Fund

Invesco Emerging Markets Select Equity Fund

Invesco Fundamental Alternatives Fund

Invesco Global Allocation Fund

Invesco Global Infrastructure Fund

Invesco Global Strategic Income Fund

Invesco Health Care Fund

Invesco International Bond Fund

Invesco Macro Allocation Strategy Fund

Invesco Multi-Asset Income Fund

Invesco U.S. Managed Volatility Fund

Invesco World Bond Factor Fund