Quarterly report pursuant to Section 13 or 15(d)

Cover

v3.23.1
Cover - shares
 3 Months Ended
Mar. 31, 2023
May 12, 2023
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2023  
Document Transition Report false  
Entity File Number 814-00939  
Entity Registrant Name MSC Income Fund, Inc  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 45-3999996  
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 Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   80,456,816
Entity Central Index Key 0001535778  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q1  
Amendment Flag false