UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

Current Report

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 31, 2011 (August 26, 2011)

SOLAR SENIOR CAPITAL LTD.

(Exact name of registrant as specified in its charter)

500 Park Avenue

New York, NY 10022

(Address of principal executive offices and zip code)

Registrant’s telephone number, including area code: (212) 993-1670

Check the appropriate box below if the Form 8-K is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

On August 30, 2011, Solar Senior Capital Ltd. (the “Company”) announced that it has established a $200 million senior secured revolving credit facility with Citigroup Global Markets Inc. acting as administrative agent. In connection with this senior secured revolving credit facility, the Company’s wholly owned financing subsidiary, SUNS SPV LLC (the “SPV”), as borrower, entered into a Loan and Servicing Agreement, dated as of August 26, 2011 (the “Loan and Servicing Agreement”), whereby the Company will transfer certain loans it has originated or acquired or will originate or acquire (the “Loans”) from time to time to the SPV via a Contribution Agreement, dated as of August 26, 2011 (the “Contribution Agreement,” and together with the Loan and Servicing Agreement and various supporting documentation, the “Credit Facility”).

The Credit Facility, among other things, matures on August 26, 2016 and generally bears interest at a rate of LIBOR plus 2.25%. Under the Credit Facility, $150 million will be available initially with an additional $50 million available as a delayed draw. The Credit Facility can also be expanded up to $600 million. The Credit Facility is secured by all of the assets held by the SPV. Under the Credit Facility, the Company and the SPV, as applicable, have made certain customary representations and warranties, and are required to comply with various covenants, including leverage restrictions, reporting requirements and other customary requirements for similar credit facilities. The Credit Facility includes usual and customary events of default for credit facilities of this nature.

The description above is only a summary of the material provisions of the Credit Facility and is qualified in its entirety by reference to copies of the form of Loan and Servicing Agreement and form of Contribution Agreement, which are filed as Exhibits 10.1 and 10.2, respectively, to this current report on Form 8-K and by this reference incorporated herein.

On August 30, 2011, the Company issued a press release announcing its entry into the Credit Facility, a copy of which is attached hereto as Exhibit 99.1.

The disclosure set forth above under Item 1.01 is incorporated by reference herein.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.