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RELATED PARTY TRANSACTIONS (Tables) | 9 Months Ended
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Sep. 30, 2025
Related Party Transactions [Abstract] |
Schedule of Management And Incentive Fee | The following table provides a summary of MSC Income’s incurred base management fees, subordinated incentive fees on income and capital gains incentive fees for the three and nine months ended September 30, 2025 and 2024.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024 |  |
| (in thousands)
Base management fees | $ | 4,860 |  |  | $ | 5,338 |  |  | $ | 14,739 |  |  | $ | 15,545 |  |  |
Subordinated incentive fees on income (1) | 3,321 |  |  | 2,136 |  |  | 8,775 |  |  | 9,364 |  |  |
Capital gains incentive fees | — |  |  | — |  |  | — |  |  | — |  |  |
____________________ (1)During the three months ended September 30, 2025, the Adviser irrevocably waived $0.2 million of the subordinated incentive fees on income, and such amount is not subject to future payment. The subordinated incentive fees on income incurred before the waiver by the Adviser was $3.5 million and $8.9 million for the three and nine months ended September 30, 2025, respectively. The following table provides a summary of MSC Income’s incurred Internal Administrative Expenses (before and after waivers) for the three and nine months ended September 30, 2025 and 2024.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024 |  |
| (in thousands)
Internal Administrative Expenses before waivers | $ | 173 |  |  | $ | 2,368 |  |  | $ | 519 |  |  | $ | 7,155 |  |  |
Internal Administrative Expenses waived (1) | — |  |  | (2,206) |  |  | — |  |  | (6,678) |  |  |
____________________ (1)Waived Internal Administrative Services expenses are permanently waived and are not subject to future reimbursement.
Schedule of Annual Basis Point Rate | MSC Income is not required to reimburse the Adviser for Internal Administrative Expenses in an amount that exceeds on a quarterly basis the product obtained by multiplying (x) the value of MSC Income’s total assets at the end of each calendar quarter by (y) the applicable “Annual Basis Point Rate” set forth in the below table:
Total Assets |  | Annual Basis Point Rate
$0 - $500 million |  | 6.000 |
Over $500 million - $1.25 billion |  | 5.125 |
Greater than $1.25 billion |  | 4.500 |
Schedule of Sale of Common Stock to Main Street | The following table summarizes Main Street’s purchases of shares of MSC Income’s common stock during the three months ended September 30, 2025, pursuant to the Main Street Share Purchase Plan.
Period |  | Total number of shares purchased |  | Average price paid per share (1) |  | Total number of shares purchased as part of publicly announced plans or programs |  | Approximate dollar value of shares that may yet be purchased under the plans or programs
|  | (in thousands, except shares and per share amounts)
July 1 through July 31, 2025 |  | — |  | $ | — |  |  | — |  | $ | 19,955 |
August 1 through August 31, 2025 |  | 14,010 |  | 14.25 |  |  | 14,010 |  | 19,756 |
September 1 through September 30, 2025 |  | 41,611 |  | 13.98 |  |  | 41,611 |  | 19,175 |
___________________ (1)Includes broker commissions.

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