MSC Income Fund Announces Fourth Quarter 2026 Regular Monthly Dividends and Supplemental Dividend Payable in December 2026

Regular Monthly Dividends of $0.11 Per Share for each of October, November and December 2026

Supplemental Dividend of $0.03 Per Share Payable in December 2026

HOUSTON, Aug. 6, 2026 — MSC Income Fund, Inc. (NYSE: MSIF) (the "Fund") is pleased to announce that its Board of Directors declared regular monthly cash dividends of $0.11 per share for each of October, November and December 2026. These monthly dividends, which will be payable pursuant to the table below, total $0.33 per share for the fourth quarter of 2026.

Summary of Fourth Quarter 2026 Regular Monthly Dividends

Declared

Ex-Dividend Date

Record Date

Payment Date

Amount Per Share

8/5/2026

10/2/2026

10/2/2026

10/9/2026

$0.11

8/5/2026

11/2/2026

11/2/2026

11/9/2026

$0.11

8/5/2026

12/2/2026

12/2/2026

12/9/2026

$0.11

Total for Fourth Quarter 2026:

$0.33

In addition to the regular monthly dividends for the fourth quarter of 2026, the Board of Directors declared a supplemental cash dividend of $0.03 per share payable in December 2026. This supplemental cash dividend, which will be payable as set forth in the table below, will be paid out of the Fund's undistributed taxable income (taxable income in excess of dividends paid) as of June 30, 2026.

Supplemental Cash Dividend Payable in December 2026

Declared

Ex-Dividend Date

Record Date

Payment Date

Amount Per Share

8/5/2026

12/16/2026

12/16/2026

12/23/2026

$0.03

The final determination of the tax attributes for dividends each year are made after the close of the tax year. The final tax attributes for 2026 dividends are currently expected to include a combination of ordinary taxable income and qualified dividends and may include capital gains and return of capital.

The Fund maintains a dividend reinvestment plan (the "DRIP") which provides for the reinvestment of dividends on behalf of its registered stockholders who hold their shares with the Fund's transfer agent and registrar or certain brokerage firms that have elected to participate in the DRIP. Under the DRIP, if the Fund declares a dividend, registered stockholders who have not "opted out" of the DRIP at least ten days prior to the next dividend payment date will have their dividend automatically reinvested into additional shares of the Fund's common stock.

About MSC Income Fund, INC.

The Fund (www.mscincomefund.com) is a principal investment firm that primarily provides debt capital to private companies owned by or in the process of being acquired by a private equity fund. The Fund's portfolio investments are typically made to support leveraged buyouts, recapitalizations, growth financings, refinancings and acquisitions of companies that operate in diverse industry sectors. The Fund seeks to partner with private equity fund sponsors and primarily invests in secured debt investments within its private loan investment strategy. The Fund also maintains a portfolio of customized long-term debt and equity investments in lower middle market companies, and through those investments, the Fund has partnered with entrepreneurs, business owners and management teams in co-investments with Main Street Capital Corporation (NYSE: MAIN) ("Main Street") utilizing the customized "one-stop" debt and equity financing solutions provided in Main Street's lower middle market investment strategy. The Fund's private loan portfolio companies generally have annual revenues between $25 million and $500 million. The Fund's lower middle market portfolio companies generally have annual revenues between $10 million and $150 million.

About MSC Adviser I, LLC

MSC Adviser I, LLC ("MSCA") is a wholly-owned subsidiary of Main Street that is registered as an investment adviser under the Investment Advisers Act of 1940, as amended. MSCA serves as the investment adviser and administrator of the Fund in addition to several other advisory clients.