EXHIBIT 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in this Registration Statement No. 333-280501 on Form N-2 of our reports dated February 24, 2026, relating to the consolidated financial statements of New Mountain Finance Corporation and subsidiaries (the “Company”) and the effectiveness of New Mountain Finance Corporation’s internal control over financial reporting, appearing in the Annual Report on Form 10-K of New Mountain Finance Corporation for the year ended December 31, 2025.
/s/ DELOITTE & TOUCHE LLP
New York, New York
February 24, 2026