Principal Business and Organization	6 Months Ended
Jun. 30, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Principal Business and Organization	Principal Business and Organization KKR FS Income Trust, or the Company, is a specialty finance company, organized on February 4, 2022 as a Delaware statutory trust, that seeks to invest primarily in the debt securities of private middle market U.S. companies. The Company is externally managed by FS/KKR Advisor, LLC, or the Adviser, pursuant to an amended and restated investment advisory agreement, or the Advisory Agreement. The Adviser also performs, or oversees the performance of, the Company’s corporate operations and required administrative services pursuant to the terms of an administration agreement, or the Administration Agreement. The Company’s investment objectives are to generate current income and, to a lesser extent, long-term capital appreciation. The Company is an externally managed, non-diversified, closed-end management investment company that, on March 31, 2023, elected to be regulated as a business development company, or BDC, under the Investment Company Act of 1940, as amended, or the 1940 Act. The Company has elected to be treated for U.S. federal income tax purposes, and intends to qualify annually, as a regulated investment company, or a RIC, under the Internal Revenue Code of 1986, as amended, or the Code. The Company has various wholly-owned subsidiaries, including special-purpose financing subsidiaries and subsidiaries through which it holds interests in portfolio companies. The unaudited consolidated financial statements include both the Company’s accounts and the accounts of its wholly-owned subsidiaries as of June 30, 2026. All intercompany transactions have been eliminated in consolidation. Certain of the Company’s consolidated subsidiaries are subject to U.S. federal and state income taxes.

Principal Business and Organization

6 Months Ended

Jun. 30, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

KKR FS Income Trust, or the Company, is a specialty finance company, organized on February 4, 2022 as a Delaware statutory trust, that seeks to invest primarily in the debt securities of private middle market U.S. companies. The Company is externally managed by FS/KKR Advisor, LLC, or the Adviser, pursuant to an amended and restated investment advisory agreement, or the Advisory Agreement. The Adviser also performs, or oversees the performance of, the Company’s corporate operations and required administrative services pursuant to the terms of an administration agreement, or the Administration Agreement. The Company’s investment objectives are to generate current income and, to a lesser extent, long-term capital appreciation.

The Company is an externally managed, non-diversified, closed-end management investment company that, on March 31, 2023, elected to be regulated as a business development company, or BDC, under the Investment Company Act of 1940, as amended, or the 1940 Act. The Company has elected to be treated for U.S. federal income tax purposes, and intends to qualify annually, as a regulated investment company, or a RIC, under the Internal Revenue Code of 1986, as amended, or the Code.

The Company has various wholly-owned subsidiaries, including special-purpose financing subsidiaries and subsidiaries through which it holds interests in portfolio companies. The unaudited consolidated financial statements include both the Company’s accounts and the accounts of its wholly-owned subsidiaries as of June 30, 2026. All intercompany transactions have been eliminated in consolidation. Certain of the Company’s consolidated subsidiaries are subject to U.S. federal and state income taxes.