v3.26.3
DIVIDENDS, DISTRIBUTIONS AND TAXABLE INCOME (Tables)
 9 Months Ended
Sep. 30, 2026
Income Tax Disclosure [Abstract]  
Schedule of Dividend Information
A summary of dividends paid for the three and nine months ended September 30, 2026 and 2025 is as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
2026202520262025
(in thousands, except per share amounts)
Regular monthly dividends per share$0.795 $0.765 $2.355 $2.265 
Supplemental dividends per share0.30 0.30 0.90 0.90 
Total dividends per share$1.095 $1.065 $3.255 $3.165 
Total regular monthly dividends$74,509 $68,543 $217,582 $201,959 
Total supplemental dividends28,167 26,907 83,940 80,364 
Total dividends$102,676 $95,450 $301,522 $282,323 
Schedule of Taxable Income and to Total Distributions Declared to Common Stock Reconciliation
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, 2026 and 2025 is as follows:
Nine Months Ended
September 30,

20262025
(estimated, in thousands)
Net increase in net assets resulting from operations$313,641 $362,287 
Book-tax difference from share-based compensation expense(6,405)(9,878)
Net unrealized appreciation(50,126)(107,217)
Income tax provision26,912 21,360 
Pre-tax book income not consolidated for tax purposes(26,454)(96,943)
Book income and tax income differences, including debt origination, structuring fees, dividends, realized gains and changes in estimates(4,596)75,778 
Estimated taxable income (1)252,972 245,387 
Taxable income earned in prior year and carried forward for distribution in current year80,058 120,488 
Taxable income earned prior to period end and carried forward for distribution next period(54,868)(105,651)
Dividend payable as of period end and paid in the following period24,842 22,832 
Total distributions accrued or paid to common stockholders$303,004 $283,056 
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(1)MSCC’s taxable income for each period is an estimate and will not be finally determined until MSCC 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 Net Investment Income Related Taxes Main Street’s provision for income taxes was comprised of the following for the three and nine months ended September 30, 2026 and 2025:
Three Months Ended
September 30,		Nine Months Ended
September 30,
2026202520262025
(in thousands)
Net investment income taxes
Current tax expense (benefit):
Federal$174 $— $(54)$— 
State and other279 1,121 1,338 2,268 
Excise303 838 1,343 2,997 
Total current tax expense756 1,959 2,627 5,265 
Deferred tax expense (benefit):
Federal974 864 6,434 6,334 
State and other7 154 (587)442 
Total deferred tax expense981 1,018 5,847 6,776 
Total net investment income tax provision$1,737 $2,977 $8,474 $12,041 
Investment valuation related taxes
Current tax expense (benefit):
Federal$(337)$2,578 $— $6,969 
Total current tax expense (benefit)(337)2,578 — 6,969 
Deferred tax expense (benefit):
Federal6,987 3,774 15,615 3,702 
State and other1,021 389 2,823 (1,352)
Total deferred tax expense8,008 4,163 18,438 2,350 
Total investment valuation related income tax provision$7,671 $6,741 $18,438 $9,319 
Total income tax provision$9,408 $9,718 $26,912 $21,360