Report of Independent Registered Public Accounting Firm

To the Board of Trustees of AIM Growth Series (Invesco Growth Series) and Shareholders of Invesco Conservative Allocation Fund, Invesco Growth Allocation Fund, Invesco Moderate Allocation Fund, Invesco Income Allocation Fund, Invesco International Allocation Fund, Invesco Balanced-Risk Retirement Now Fund, Invesco Balanced-Risk Retirement 2020 Fund, Invesco Balanced-Risk Retirement 2030 Fund, Invesco Balanced-Risk Retirement 2040 Fund, Invesco Balanced-Risk Retirement 2050 Fund, Invesco Convertible Securities Fund, Invesco Global Low Volatility Equity Yield Fund, Invesco Mid Cap Core Equity Fund, Invesco Small Cap Growth Fund, Invesco Quality Income Fund, Invesco Peak Retirement^™ Now Fund, Invesco Peak Retirement^™ 2015 Fund, Invesco Peak Retirement^™ 2020 Fund, Invesco Peak Retirement^™ 2025 Fund, Invesco Peak Retirement^™ 2030 Fund, Invesco Peak Retirement^™ 2035 Fund, Invesco Peak Retirement^™ 2040 Fund, Invesco Peak Retirement^™ 2045 Fund, Invesco Peak Retirement^™ 2050 Fund, Invesco Peak Retirement^™ 2055 Fund, Invesco Peak Retirement^™ 2060 Fund, Invesco Peak Retirement^™ 2065 Fund, Invesco Oppenheimer International Diversified Fund, Invesco Oppenheimer Main Street Mid Cap Fund^®, Invesco Oppenheimer Main Street Small Cap Fund^®, Invesco Oppenheimer Master Event-Linked Bond Fund, Invesco Oppenheimer Portfolio Series: Active Allocation Fund, Invesco Oppenheimer Portfolio Series: Conservative Investor Fund, Invesco Oppenheimer Portfolio Series: Growth Investor Fund, and Invesco Oppenheimer Portfolio Series: Moderate Investor Fund.

In planning and performing our audit of the financial statements of the funds listed in Appendix A (constituting AIM Growth Series (Invesco Growth Series), hereafter collectively referred to as the “Funds”) as of and for the year periods indicated in Appendix A, 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 Fund 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.

PricewaterhouseCoopers LLP, 1000 Louisiana Street, Suite 5800, Houston, TX 77002

   T: (713) 356 4000, F: (713) 356 4717, www.pwc.com/us

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 material weaknesses as defined above as of December 31, 2019.

This report is intended solely for the information and use of the Board of Trustees AIM Growth Series (Invesco Growth Series) 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

February 28, 2020

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Appendix A

Invesco Balanced-Risk Retirement Now Fund Invesco Balanced-Risk Retirement 2020 Fund Invesco Balanced-Risk Retirement 2030 Fund Invesco Balanced-Risk Retirement 2040 Fund Invesco Balanced-Risk Retirement 2050 Fund Invesco Conservative Allocation Fund Invesco Convertible Securities Fund Invesco Global Low Volatility Equity Yield Fund Invesco Growth Allocation Fund Invesco Mid Cap Core Equity Fund Invesco Moderate Allocation Fund Invesco Income Allocation Fund Invesco International Allocation Fund Invesco Peak RetirementTM Now Fund Invesco Peak RetirementTM 2015 Fund Invesco Peak RetirementTM 2020 Fund Invesco Peak RetirementTM 2025 Fund Invesco Peak RetirementTM 2030 Fund Invesco Peak RetirementTM 2035 Fund Invesco Peak RetirementTM 2040 Fund Invesco Peak RetirementTM 2045 Fund Invesco Peak RetirementTM 2050 Fund Invesco Peak RetirementTM 2055 Fund Invesco Peak RetirementTM 2060 Fund Invesco Peak RetirementTM 2065 Fund Invesco Quality Income Fund Invesco Small Cap Growth Fund	For the year ended December 31, 2019
Invesco Oppenheimer International Diversified Fund Invesco Oppenheimer Main Street Small Cap Fund®	For the period from May 1, 2019 through December 31, 2019
Invesco Oppenheimer Main Street Mid Cap Fund®	For the period from July 1, 2019 through December 31, 2019
Invesco Oppenheimer Master Event-Linked Bond Fund	For the period from October 1, 2019 through December 31, 2019
Invesco Oppenheimer Portfolio Series: Active Allocation Fund Invesco Oppenheimer Portfolio Series: Conservative Investor Fund Invesco Oppenheimer Portfolio Series: Growth Investor Fund Invesco Oppenheimer Portfolio Series: Moderate Investor Fund	For the period from February 1, 2019 through December 31, 2019

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