Quarterly report [Sections 13 or 15(d)]

DIVIDENDS, DISTRIBUTIONS AND TAXABLE INCOME (Tables)

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DIVIDENDS, DISTRIBUTIONS AND TAXABLE INCOME (Tables)
3 Months Ended
Mar. 31, 2026
Income Tax Disclosure [Abstract]  
Schedule of Dividend Information
A summary of dividends paid for the three months ended March 31, 2026 and 2025 is as follows:
Three Months Ended March 31,
2026 2025
(in thousands, except per share amounts)
Regular monthly dividends per share $ 0.78  $ 0.75 
Supplemental dividends per share 0.30  0.30 
Total dividends per share $ 1.08  $ 1.05 
Total regular monthly dividends $ 70,383  $ 66,508 
Total supplemental dividends 27,731  26,639 
Total dividends $ 98,114  $ 93,147 
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 three months ended March 31, 2026 and 2025 is as follows:
Three Months Ended March 31,

2026 2025
(estimated, in thousands)
Net increase in net assets resulting from operations $ 48,981  $ 116,082 
Book-tax difference from share-based compensation expense 5,105  4,842 
Net unrealized (appreciation) depreciation 50,599  (63,190)
Income tax provision 6,236  7,373 
Pre-tax book income not consolidated for tax purposes (28,080) (14,078)
Book income and tax income differences, including debt origination, structuring fees, dividends, realized gains and changes in estimates 5,624  47,082 
Estimated taxable income (1) 88,465  98,111 
Taxable income earned in prior year and carried forward for distribution in current year 80,058  120,488 
Taxable income earned prior to period end and carried forward for distribution next period (93,767) (147,552)
Dividend payable as of period end and paid in the following period 24,126  22,165 
Total distributions accrued or paid to common stockholders $ 98,882  $ 93,212 
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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 months ended March 31, 2026 and 2025:
Three Months Ended
March 31,
2026 2025
(in thousands)
Net investment income taxes
Current tax expense:
Federal $ —  $ 164 
State and other 455  660 
Excise 381  1,341 
Total current tax expense 836  2,165 
Deferred tax expense (benefit):
Federal 3,627  1,894 
State and other (1,199) (146)
Total deferred tax expense 2,428  1,748 
Total net investment income tax provision $ 3,264  $ 3,913 
Investment valuation related taxes
Current tax expense:
Federal $ 1,443  $ 321 
Total current tax expense 1,443  321 
Deferred tax expense (benefit):
Federal 1,103  3,271 
State and other 426  (132)
Total deferred tax expense 1,529  3,139 
Total investment valuation related income tax provision $ 2,972  $ 3,460 
Total income tax provision $ 6,236  $ 7,373