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): June 8, 2015

Sierra Income Corporation

(Exact name of registrant as specified in its charter)

375 Park Ave, 33^rd Floor

New York, NY 10152

(Address of principal executive offices and zip code)

Registrant’s telephone number, including area code: (212) 759-0777

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

Amendment to Total Return Swap

On June 8, 2015, Sierra Income Corporation (“Sierra”), through Arbor Funding LLC (“Arbor”), its wholly-owned financing subsidiary, entered into the Third Amended and Restated Confirmation Letter Agreement (the “Third Amended Confirmation Agreement”) with Citibank, N.A. (“Citi”), initially entered into on August 27, 2013, and amended and restated on March 21, 2014 and July 23, 2014, relating to a total return swap, or TRS, for senior secured floating rate loans. The TRS with Citi enables Sierra, through Arbor, to obtain the economic benefit of the loans subject to the TRS, despite the fact that such loans will not be directly held or otherwise owned by Sierra or Arbor, in return for an interest-type payment to Citi. The Third Amended Confirmation Agreement reduces the maximum market value (determined at the time each such loan becomes subject to the TRS) of the portfolio of loans that Arbor may select from $350,000,000 to $300,000,000. Other than the foregoing, the Third Amended Confirmation Agreement did not change any of the other terms of the TRS.

The terms of the TRS are governed by an ISDA 2002 Master Agreement, the Schedule thereto and Credit Support Annex to such Schedule, and the Third Amended Confirmation Agreement exchanged thereunder, between Arbor and Citi, which collectively establish the TRS.

The foregoing descriptions of the TRS, the ISDA 2002 Master Agreement, the initial Confirmation Letter Agreement, the First Amended and Restated Confirmation Letter Agreement, the Second Amended and Restated Confirmation Letter Agreement and the Third Amended Confirmation Agreement do not purport to be complete and are qualified in their entirety by reference to the full text of the ISDA 2002 Master Agreement, filed as exhibit 10.1 to Sierra’s Current Report on Form 8-K filed with the Securities and Exchange Commission (“SEC”) on September 3, 2013, the initial Confirmation Letter Agreement, filed as exhibit 10.2 to Sierra’s Current Report on Form 8-K filed with the SEC on September 3, 2013, the First Amended and Restated Confirmation Letter Agreement filed as exhibit 10.1 to Sierra’s Current Report on Form 8-K filed with the SEC on March 27, 2014, the Second Amended and Restated Confirmation Letter Agreement attached as exhibit 10.4 to Sierra’s Current Report on Form 8-K filed with the SEC on July 23, 2014, and the Third Amended Confirmation Agreement attached as exhibit 10.1 hereto.

The information in Item 1.01 of this Current Report on Form 8-K is incorporated by reference into this Item 2.03.

(d) Exhibits.

SIGNATURE

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

EXHIBIT INDEX