MSC Income Fund Quarterly report [Sections 13 or 15(d)]

DEBT - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Debt Instrument [Line Items]
Total interest expense	$ 9,951	$ 8,649	$ 28,736	$ 25,570
October 2026 Notes \| Unsecured Debt
Debt Instrument [Line Items]
Total interest expense	1,590	1,590	4,769	4,769
May 2029 Notes \| Unsecured Debt
Debt Instrument [Line Items]
Total interest expense	2,440	0	5,363	0
September 2029 Notes \| Unsecured Debt
Debt Instrument [Line Items]
Total interest expense	428	0	428	0
Revolving Credit Facility \| SPV Facility \| Line of Credit
Debt Instrument [Line Items]
Total interest expense	4,000	4,220	11,945	13,234
Revolving Credit Facility \| Corporate Facility \| Line of Credit
Debt Instrument [Line Items]
Total interest expense	1,464	2,839	6,110	7,567
Revolving Credit Facility \| Main Street Facility \| Line of Credit
Debt Instrument [Line Items]
Total interest expense	$ 29	$ 0	$ 121	$ 0