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DIVIDENDS, DISTRIBUTIONS AND TAXABLE INCOME (Tables) | 9 Months Ended
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Sep. 30, 2025
Income Tax Disclosure [Abstract] |
Schedule of Dividends Payable | summary of dividends accrued during 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, except per share amounts)
Regular quarterly dividends per share |  | $ | 0.35 |  |  | $ | 0.36 |  |  | $ | 1.05 |  |  | $ | 1.09 |
Supplemental quarterly dividends per share |  | 0.01 |  |  | — |  |  | 0.03 |  |  | — |
Total dividends per share |  | $ | 0.36 |  |  | $ | 0.36 |  |  | $ | 1.08 |  |  | $ | 1.09 |
Total regular quarterly dividends |  | $ | 16,544 |  |  | $ | 14,478 |  |  | $ | 49,444 |  |  | $ | 43,724 |
Total supplemental quarterly dividends |  | 472 |  |  | — |  |  | 1,412 |  |  | — |
Total dividends |  | $ | 17,016 |  |  | $ | 14,478 |  |  | $ | 50,856 |  |  | $ | 43,724 |
Schedule of Taxable Income and to Total Distributions Declared to Common Stock Reconciliation | Listed below is a reconciliation of “Net increase in net assets resulting from operations” to taxable income and to total distributions declared to common stockholders for the nine months ended September 30, 2025 and 2024.
| Nine Months Ended September 30,
| 2025 |  | 2024
| (estimated, in thousands)
Net increase in net assets resulting from operations | $ | 58,693 |  |  | $ | 36,089 |
Net unrealized (appreciation) depreciation | (35,886) |  |  | 24,656 |
Income tax provision | 2,176 |  |  | 6,150 |
Pre-tax book income not consolidated for tax purposes | (11,924) |  |  | (9,867) |
Book income and tax income differences, including debt origination, structuring fees, dividends, realized gains and changes in estimates | 27,980 |  |  | (9,989) |
Estimated taxable income (1) | 41,039 |  |  | 47,039 |
Taxable income earned in prior year and carried forward for distribution in current year | 20,348 |  |  | 14,745 |
Taxable income earned prior to period end and carried forward for distribution next period | (27,547) |  |  | (32,538) |
Dividend payable as of period end and paid in the following period | 17,016 |  |  | 14,478 |
Total distributions accrued or paid to common stockholders | $ | 50,856 |  |  | $ | 43,724 |
________________ (1)MSIF’s taxable income for each period is an estimate and will not be finally determined until MSIF files its tax return for each year. Therefore, the final taxable income, and the taxable income earned in each period and carried forward for distribution in the following period, may be different than this estimate.
Schedule of Provision for Income Taxes | MSC Income’s provision for income taxes was comprised of the following 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)
Net investment income taxes |  |  |  |  |  |  |
Current tax expense (benefit): |  |  |  |  |  |  |
Federal | $ | (38) |  |  | $ | 761 |  |  | $ | 80 |  |  | $ | 940 |
State and other | 108 |  |  | 396 |  |  | 449 |  |  | 810 |
Excise | (39) |  |  | 491 |  |  | 240 |  |  | 570 |
Total current tax expense | 31 |  |  | 1,648 |  |  | 769 |  |  | 2,320 |
Deferred tax expense (benefit): |  |  |  |  |  |  |
Federal | 474 |  |  | (245) |  |  | 1,716 |  |  | 500 |
State and other | (52) |  |  | (137) |  |  | 8 |  |  | (49) |
Total deferred tax expense (benefit) | 422 |  |  | (382) |  |  | 1,724 |  |  | 451 |
Total net investment income tax provision | $ | 453 |  |  | $ | 1,266 |  |  | $ | 2,493 |  |  | $ | 2,771 |
Investment valuation related taxes |  |  |  |  |  |  |
Current tax expense: |  |  |  |  |  |  |
Federal | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 205 |
Total current tax expense | — |  |  | — |  |  | — |  |  | 205 |
Deferred tax expense (benefit): |  |  |  |  |  |  |
Federal | 1,051 |  |  | 898 |  |  | (362) |  |  | 2,895 |
State and other | 150 |  |  | 270 |  |  | 45 |  |  | 279 |
Total deferred tax expense (benefit) | 1,201 |  |  | 1,168 |  |  | (317) |  |  | 3,174 |
Total investment valuation related income tax provision (benefit) | $ | 1,201 |  |  | $ | 1,168 |  |  | $ | (317) |  |  | $ | 3,379 |
Total income tax provision | $ | 1,654 |  |  | $ | 2,434 |  |  | $ | 2,176 |  |  | $ | 6,150 |

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- Definition Tabular disclosure of the federal tax basis of investment holdings. This item captures the aggregate cost of securities, aggregate gross unrealized appreciation for all securities in which there is an excess of value over tax cost, aggregate gross unrealized depreciation for all securities in which there is an excess of tax cost over value, net unrealized appreciation (depreciation), and an explanation of the differences between tax and book. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(h)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479886/946-10-S99-3 + Details
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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
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