Prospectus by Investment Company - Form 497

DELAWARE GROUP INCOME FUNDS

Delaware Floating Rate Fund (the "Fund")

Supplement to the Fund's Statutory Prospectus,
dated November 30, 2023, as amended

Effective immediately, the following replaces the information in the section of the Fund's Statutory Prospectus entitled "Fund summary - Who manages the Fund? - Investment manager":

Investment manager

Delaware Management Company, a series of Macquarie Investment Management Business Trust (a Delaware statutory trust)

Effectively immediately, the following replaces the information in the section of the Fund's Statutory Prospectus entitled "Who manages the Fund - Portfolio managers":

Vivek Bommi and John P. McCarthy are primarily responsible for the overall day-to-day management of the Fund.

Vivek Bommi

Managing Director, Head of Leveraged Credit

•Joined Macquarie in 2023

•Based in Philadelphia

Vivek is Head of Leveraged Credit within Macquarie Asset Management (MAM) Credit, a role he assumed in November 2023. He has overall responsibility for the team's leveraged credit capabilities, including portfolio and business management. Prior to joining Macquarie, he was Head of European and UK Fixed Income at AllianceBernstein from August 2021 to November 2023, responsible for leadership and strategy of European Fixed Income. Before that, Vivek spent more than 10 years at Neuberger Berman within Leveraged Credit in various roles, including Director of Research, Portfolio Manager, and Head of Europe. Vivek received a Bachelor of Science in finance from the University of Illinois and a Master of Business Administration in finance and management from Columbia Business School. He holds the Chartered Financial Analyst^® designation and he is a Certified Public Accountant.

John P. McCarthy

Managing Director, Senior Portfolio Manager

•Re-joined Delaware Investments in 2007, acquired by Macquarie in 2010

•Based in Philadelphia

John is a Senior Portfolio Manager for Fixed Income within Macquarie Asset Management (MAM) Credit, a role he assumed in July 2016. He manages MAM Credit's high yield portfolios and serves as a Co-Portfolio Manager for MAM Credit's bank loans, fixed rate multisector, and core plus strategies. Previously, he was Co-Head of Credit Research for MAM Credit. Before that, he held a number of roles with Delaware Investments, including Senior Research Analyst, Senior High Yield Analyst, High Yield Trader, and Municipal Bond Trader. He worked for Delaware Investments from 1990 to 2002 and re-joined the firm in 2007. Prior to re-joining Delaware Investments, John was a Senior High Yield Analyst and Trader at Chartwell Investment Partners for five years. John earned a Bachelor of Science in business administration from Babson College. He holds the Chartered Financial Analyst^® designation and is a member of the CFA Society of Philadelphia.

Please keep this Supplement for future reference.