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DEBT (Tables) | 9 Months Ended
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Sep. 30, 2025
Debt Disclosure [Abstract] |
Schedule of Debt and Average Amount of Total Borrowings Outstanding and Weighted-Overall Average Effective Interest Rate | The following table provides a summary of MSC Income’s debt as of September 30, 2025.
| Outstanding Balance |  | Unamortized Debt Issuance Costs (1) |  | Recorded Value |  | Estimated Fair Value (2)
| (in thousands)
SPV Facility | $ | 234,000 |  |  | $ | — |  |  | $ | 234,000 |  |  | $ | 234,000 |
Corporate Facility | 145,000 |  |  | — |  |  | 145,000 |  |  | 145,000 |
Series A Notes | 150,000 |  |  | (323) |  |  | 149,677 |  |  | 146,083 |
Total Debt | $ | 529,000 |  |  | $ | (323) |  |  | $ | 528,677 |  |  | $ | 525,083 |
_________________ (1)The unamortized debt issuance costs for the Credit Facilities are reflected as Deferred financing costs on the Consolidated Balance Sheets, while the deferred debt issuance costs related to the Series A Notes are reflected as a contra-liability to the Series A Notes on the Consolidated Balance Sheets. (2)Estimated fair value for outstanding debt is shown as if MSC Income had adopted the fair value option under ASC 825, Financial Instruments (“ASC 825”). See discussion of the methods used to estimate the fair value of MSC Income’s debt in Note B.10. — Summary of Significant Accounting Policies — Fair Value of Financial Instruments. The following table provides a summary of MSC Income’s debt as of December 31, 2024.
| Outstanding Balance |  | Unamortized Debt Issuance Costs (1) |  | Recorded Value |  | Estimated Fair Value (2)
| (in thousands)
SPV Facility | $ | 266,688 |  |  | $ | — |  |  | $ | 266,688 |  |  | $ | 266,688 |
Corporate Facility | 149,000 |  |  | — |  |  | 149,000 |  |  | 149,000 |
Series A Notes | 150,000 |  |  | (547) |  |  | 149,453 |  |  | 141,892 |
Total Debt | $ | 565,688 |  |  | $ | (547) |  |  | $ | 565,141 |  |  | $ | 557,580 |
___________________ (1)The unamortized debt issuance costs for the Credit Facilities are reflected as Deferred financing costs on the Consolidated Balance Sheets, while the deferred debt issuance costs related to the Series A Notes are reflected as a contra-liability to the Series A Notes on the Consolidated Balance Sheets. (2)Estimated fair value for outstanding debt is shown as if MSC Income had adopted the fair value option under ASC 825. See discussion of the methods used to estimate the fair value of MSC Income’s debt in Note B.10. — Summary of Significant Accounting Policies — Fair Value of Financial Instruments. A summary of MSC Income’s average amount of total borrowings outstanding and overall weighted-average effective interest rate including amortization of debt issuance costs, original issuance discounts and premiums and fees on unused lender commitments are as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
| (dollars in millions)
Weighted-average borrowings outstanding | $ | 555.5 |  |  | $ | 531.1 |  |  | $ | 543.5 |  |  | $ | 504.5 |
Weighted-average effective interest rate | 6.1 | % |  | 7.8 | % |  | 6.1 | % |  | 7.8 | %
Schedule of Interest Expense | Summarized interest expense for the three and nine months ended September 30, 2025 and 2024 is as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
| (in thousands)
SPV Facility | $ | 4,220 |  |  | $ | 5,904 |  |  | $ | 13,234 |  |  | $ | 17,902 |
Corporate Facility | 2,839 |  |  | 2,880 |  |  | 7,567 |  |  | 6,799 |
Series A Notes | 1,590 |  |  | 1,590 |  |  | 4,769 |  |  | 4,769 |
Total Interest Expense | $ | 8,649 |  |  | $ | 10,374 |  |  | $ | 25,570 |  |  | $ | 29,470 |

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