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N-2 - $ / shares | 9 Months Ended |  |  |
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Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Cover [Abstract] |  |  |  |
Entity Central Index Key | 0001535778 |  |  |
Amendment Flag | false |  |  |
Securities Act File Number | 814-00939 |  |  |
Document Type | 10-Q |  |  |
Entity Registrant Name | MSC Income Fund, Inc |  |  |
Entity Address, Address Line One | 1300 Post Oak Boulevard |  |  |
Entity Address, Address Line Two | 8th Floor |  |  |
Entity Address, City or Town | Houston |  |  |
Entity Address, State or Province | TX |  |  |
Entity Address, Postal Zip Code | 77056 |  |  |
City Area Code | (713 |  |  |
Local Phone Number | 350-6000 |  |  |
Entity Emerging Growth Company | false |  |  |
General Description of Registrant [Abstract] |  |  |  |
Investment Objectives and Practices [Text Block] | OVERVIEW OF THE BUSINESS MSC Income’s principal investment objective is to maximize its Investment Portfolio’s total return, primarily by generating current income from debt investments and, to a lesser extent, by generating current income and capital appreciation from equity and equity-related investments, including warrants, convertible securities and other rights to acquire equity securities in a portfolio company. MSC Income seeks to achieve its investment objective primarily through its Private Loan investment strategy and its LMM investment portfolio. MSC Income’s Private Loan investment strategy involves investments in companies that generally have annual revenues between $25 million and $500 million and annual earnings before interest, tax, depreciation and amortization expenses (“EBITDA”) between $7.5 million and $50 million. MSC Income’s LMM investment portfolio consists of investments in companies that generally have annual revenues between $10 million and $150 million and annual EBITDA between $3 million and $20 million. MSC Income’s Private Loan and LMM investments generally range in size from $1 million to $30 million. Private Loan investments primarily consist of debt securities that have primarily been originated directly by the Adviser or, to a lesser extent, through the Adviser’s strategic relationships with other investment funds on a collaborative basis through investments that are often referred to in the debt markets as “club deals” because of the small lender group size. In both cases, MSC Income’s Private Loan investments are typically made in a company owned by or in the process of being acquired by a private equity fund. The Fund’s Private Loan portfolio debt investments are generally secured by a first priority lien on the assets of the portfolio company and typically have a term of between three and seven years from the original investment date. The Fund may also co-invest with Main Street and the private equity fund in the equity securities of its Private Loan portfolio companies. MSC Income has also historically sought to fill the financing gap for LMM businesses, which, historically, have had limited access to financing from commercial banks and other traditional sources. The underserved nature of the LMM created the opportunity for MSC Income to meet the financing needs of LMM companies while also negotiating favorable transaction terms and equity participation. MSC Income’s ability to invest across a company’s capital structure, from secured loans to equity securities, allowed it to offer portfolio companies a comprehensive suite of financing options, or a “one-stop” financing solution. MSC Income’s LMM portfolio debt investments are generally secured by a first priority lien on the assets of the portfolio company and typically have a term of between five and seven years from the original investment date. In connection with the MSC Income Listing, the Fund’s Board of Directors and the Adviser decided to change its investment strategy with respect to new platform investments to be solely focused on the Fund’s Private Loan investment strategy. As a result, the size of the Fund’s LMM investment portfolio is expected to decrease over time as its existing LMM investments are repaid or sold in the ordinary course of business. The Fund does, however, plan to continue executing follow-on investments in its existing LMM portfolio companies going forward in accordance with its existing SEC order for co-investment exemptive relief. MSC Income’s Middle Market investments are generally debt investments in companies owned by a private equity fund that were originally issued through a syndication financing process. MSC Income has generally stopped making new Middle Market investments and expects the size of its Middle Market investment portfolio to continue to decline in future periods as existing Middle Market investments are repaid or sold. MSC Income’s Middle Market debt investments generally range in size from $1 million to $20 million, are generally secured by a first priority lien on the assets of the portfolio company and typically have an expected duration of between three and seven years from the original investment date. MSC Income’s Other Portfolio investments primarily consist of investments that are not consistent with the typical profiles for its Private Loan, LMM or Middle Market portfolio investments, including investments in unaffiliated investment companies and private funds managed by third parties. In the Fund’s Other Portfolio, it may incur indirect fees and expenses to third party managers. Similar to MSC Income’s Middle Market investments, the Fund has generally stopped making new Other Portfolio investments and expects the size of its Other Portfolio to continue to decline in future periods as existing Other Portfolio investments are repaid or sold. Subject to changes in MSC Income’s cash and overall liquidity, it may in the future invest in short-term portfolio investments that are atypical of its Private Loan and LMM portfolio investments in that they would be intended to be a short-term deployment of capital. These assets would be expected to be realized in one year or less and would not be expected to be a significant portion of MSC Income’s overall Investment Portfolio. MSC Income’s portfolio investments are generally made through MSIF, the Taxable Subsidiaries and the Structured Subsidiaries. MSIF, the Taxable Subsidiaries and the Structured Subsidiaries share the same investment strategies and criteria. An investor’s return in MSIF will depend, in part, on the Taxable Subsidiaries’ and the Structured Subsidiaries’ investment returns as they are wholly-owned subsidiaries of MSIF. The level of new portfolio investment activity will fluctuate from period to period based upon MSC Income’s view of the current economic fundamentals, its ability to identify new investment opportunities that meet its investment criteria, its ability to consummate the identified opportunities and its available liquidity. The level of new investment activity, and associated interest and fee income, will directly impact future investment income. In addition, the level of dividends paid by portfolio companies and the portion of the Fund’s portfolio debt investments on non-accrual status will directly impact future investment income. While MSC Income intends to grow its portfolio and its investment income over the long term, growth and operating results may be more limited during depressed economic periods. However, the Fund intends to appropriately manage its cost structure and liquidity position based on applicable economic conditions and investment outlook. The level of realized gains or losses and unrealized appreciation or depreciation on investments will also fluctuate depending upon portfolio activity, economic conditions and the performance of individual portfolio companies. The changes in realized gains and losses and unrealized appreciation or depreciation could have a material impact on the Fund’s operating results. MSC Income has received an exemptive order from the SEC permitting co-investments among it, Main Street and other advisory clients of the Adviser in certain negotiated transactions where co-investing would otherwise be prohibited under the 1940 Act. MSC Income has made co-investments with, and in the future intends to continue to make co-investments with Main Street and other advisory clients of the Adviser, in accordance with the conditions of the order. The order requires, among other things, that Main Street and the Adviser consider whether each such investment opportunity is appropriate for MSC Income, Main Street and the other advisory clients of the Adviser, as applicable, and if it is appropriate, to propose an allocation of the investment opportunity between such parties. Because the Adviser is wholly-owned by Main Street and is not managing MSC Income’s investment activities as its sole activity, this may provide the Adviser an incentive to allocate opportunities to Main Street or its other advisory clients instead of MSC Income. However, both MSC Income and the Adviser have policies and procedures in place to manage this conflict, including approval of investment allocations and oversight of co-investments by the independent members of MSC Income’s Board of Directors. In addition to the co-investment program described above, MSC Income also co-invests in certain investment transactions where price is the only negotiated point by the Fund and its affiliates. |  |  |
Risk Factors [Table Text Block] | You should carefully consider the risks described below and all other information contained in this Quarterly Report on Form 10-Q, including MSC Income’s interim consolidated financial statements and the related notes thereto, before making a decision to purchase MSC Income’s securities. The risks and uncertainties described below are not the only ones facing the Fund. Additional risks and uncertainties not currently known or currently deemed to be immaterial also may have a material adverse effect on the Fund’s business, financial condition and/or operating results, as well as the market price of MSC Income’s securities. In addition to the other information set forth in this report, you should carefully consider the risk factors described in Item 1A. Risk Factors in MSC Income’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024 filed with the SEC on March 20, 2025 and in its Quarterly Report on Form 10-Q for the quarter ended March 31, 2025 filed with the SEC on May 13, 2025, which could materially affect the business, financial condition and/or operating results. |  |  |
NAV Per Share | $ 15.54 | $ 15.53 | $ 15.38 | $ 15.54
SPV Facility [Member] |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |
Long Term Debt, Title [Text Block] | SPV Facility |  |  |
Long Term Debt, Structuring [Text Block] | MSC Income, through MSIF Funding, LLC (“MSIF Funding”), a wholly-owned Structured Subsidiary that primarily holds debt investments, maintains a special purpose vehicle revolving credit facility dated February 3, 2021 (as amended, the “SPV Facility”) with JPMorgan Chase Bank, National Association (“JPM”), as administrative agent, and U.S. Bank, N.A., as collateral agent and collateral administrator, JPM and other financial institutions as lenders and MSIF as portfolio manager. In March 2025, the SPV Facility was amended to, among other things: (i) decrease the interest rate for advances to the applicable SOFR plus 2.20% from the prior interest rate of the applicable SOFR plus 3.00%, (ii) extend the revolving period from through February 2027 to through February 2029 and (iii) extend the final maturity date from February 2028 to February 2030. As of September 30, 2025, the SPV Facility included (i) total commitments of $300.0 million, (ii) an accordion feature with the right to request an increase of total commitments and borrowing availability up to $450.0 million and (iii) a revolving period through February 2029 and a final maturity date in February 2030. As of September 30, 2025, advances under the SPV Facility bore interest at a rate equal to the applicable SOFR in effect, plus a margin of 2.20%. MSIF Funding also pays a commitment fee of 0.75% on the average daily unused amount of the financing commitments until February 2029. The SPV Facility is secured by a first lien on the assets of MSIF Funding. Borrowing availability under the SPV Facility is subject to certain leverage and borrowing base limitations, covenants, reporting and other requirements customary for similar credit facilities. |  |  |
Corporate Facility [Member] |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |
Long Term Debt, Title [Text Block] | Corporate Facility |  |  |
Long Term Debt, Structuring [Text Block] | September 30, 2025, the Corporate Facility included (i) total commitments of $245.0 million from a diversified group of seven lenders, (ii) an accordion feature with the right to request an increase in commitments under the facility from new and existing lenders on the same terms and conditions as the existing commitments up to $300.0 million of total commitments and (iii) a revolving period through November 2028 and a final maturity date in May 2029, with two one-year extension options subject to lender approval. Borrowings under the Corporate Facility bear interest, subject to MSC Income’s election, at a rate equal to (i) SOFR plus 2.05% or (ii) the base rate plus 1.05%. The base rate is defined as the higher of (a) the Prime rate, (b) the Federal Funds Rate (as defined in the credit agreement) plus 0.5% or (c) SOFR plus 1.0%. Additionally, MSC Income pays an unused commitment fee of 0.25% on the unused lender commitments if 50% or more of the lender commitments are being used and an unused commitment fee of 0.375% on the unused lender commitments if less than 50% of the lender commitments are being used. Borrowings under the Corporate Facility are secured by a first lien on all of the assets of MSIF and its subsidiaries, excluding the assets of Structured Subsidiaries or immaterial subsidiaries, as well as all of the assets, and a pledge of equity ownership interests, of any future subsidiaries of MSIF (other than Structured Subsidiaries or immaterial subsidiaries). Borrowing availability under the Corporate Facility is subject to certain leverage and borrowing base limitations, covenants, reporting and other requirements customary for similar credit facilities. |  |  |
Series A Notes due 2026 [Member] |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |
Long Term Debt, Title [Text Block] | Series A Notes |  |  |
Long Term Debt, Structuring [Text Block] | Pursuant to a Master Note Purchase Agreement dated October 21, 2021 (the “Note Purchase Agreement”), MSC Income issued $77.5 million of 4.04% Series A Senior Notes due 2026 (the “Series A Notes”) upon entering into the Note Purchase Agreement and an additional $72.5 million on January 21, 2022. The Series A Notes bear a fixed interest rate of 4.04% per year and mature on October 30, 2026, unless redeemed, purchased or prepaid prior to such date by the Fund in accordance with their terms. Interest on the Series A Notes is due semiannually on April 30 and October 30 of each year. The Series A Notes may be redeemed in whole or in part at any time at MSC Income’s option subject to certain make-whole provisions. In addition, MSC Income is obligated to offer to prepay the Series A Notes at par plus accrued and unpaid interest up to, but excluding, the date of prepayment, if certain change in control events occur. In the event that a Below Investment Grade Event (as defined in the Note Purchase Agreement) occurs, the Series A Notes will bear interest at a fixed rate of 5.04% per year from the date of the occurrence of the Below Investment Grade Event to and until the date on which the Below Investment Grade Event ends. The Series A Notes are general unsecured obligations of MSIF that rank pari passu with all outstanding and future unsecured unsubordinated indebtedness issued by MSIF. The Note Purchase Agreement also contains customary events of default with customary cure and notice periods, including, without limitation, nonpayment, incorrect representation in any material respect, breach of covenant, cross-default under other indebtedness of MSIF or subsidiary guarantors subject to a cure pass-through, certain judgments and orders and certain events of bankruptcy. |  |  |

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