Principal Life Insurance Company, Raleigh, NC 27612 A member of the Principal Financial Group® THE EXECUTIVENONQUALIFIED DEFINED BENEFIT PLAN ADOPTION AGREEMENT

Exhibit 10.7

Principal Life Insurance Company, Raleigh, NC 27612

A member of the Principal Financial Group^®

THE EXECUTIVE NONQUALIFIED DEFINED BENEFIT PLAN

ADOPTION AGREEMENT

THIS AGREEMENT is the adoption by Kforce Inc. (the “Company”) of the Executive Nonqualified Defined Benefit Plan (“Plan”).

W I T N E S S E T H:

WHEREAS, the Company desires to adopt the Plan as an unfunded, nonqualified deferred compensation plan; and

WHEREAS, the provisions of the Plan are intended to comply with the requirements of Section 409A of the Code and the regulations thereunder and shall apply to amounts subject to section 409A; and

WHEREAS, the Company has been advised by Principal Life Insurance Company to obtain legal and tax advice from its professional advisors before adopting the Plan,

NOW, THEREFORE, the Company hereby adopts the Plan in accordance with the terms and conditions set forth in this Adoption Agreement:

ARTICLE I

Terms used in this Adoption Agreement shall have the same meaning as in the Plan, unless some other meaning is expressly herein set forth. The Employer hereby represents and warrants that the Plan has been adopted by the Employer upon proper authorization, and the Employer hereby elects to adopt the Plan for the benefit of its Participants as referred to in the Plan. By the execution of this Adoption Agreement, the Employer hereby agrees to be bound by the terms of the Plan.

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ARTICLE II

The Employer hereby makes the following designations or elections for the purpose of the Plan:

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If the Participant Separates from Service before reaching the Early Retirement Date, the Participant shall not have an Accrued Benefit.

For the other Qualifying Distribution Events, the Participant’s Accrued Benefit on a Straight Life basis is a monthly amount equal to (a) X (b) X [(c) / (d)], where

and where [(c) / (d)] shall not exceed one.

If the Qualifying Distribution Event is after a Participant’s Normal Retirement Date, the benefit percentage in (b) above is replaced with the following percentage based on the Participant’s age:

The benefit is further increased with interest from the first day of the month following the Normal Retirement Date to the actual date of determination based on the interest rate in the Present Value definition.

If the date of a Participant’s Qualifying Distribution Event is prior to the attainment of age sixty-two (62) and ten (10) years of service, or age fifty-five (55) and twenty-five (25) years of service, the Accrued Benefit shall be reduced by one half of one percent (1/2%) per month for each month between the Participant’s event date and the Participant’s Normal Retirement Date. For the purpose of this factor, a year of service shall mean the total number of full years in which a Participant is employed by an Employer. A year of employment shall be a 365 day period (or 366 day period in the case of a leap year) that begins on the later of December 31, 2006 or the Participant’s date of hire, and for any subsequent year, commences on the anniversary of such date. The Committee in sole discretion shall determine whether any partial year of employment shall be counted as a year of service and such determination need not be the same for each year or for each Participant.

If the Participant is covered by an employment agreement (“Employment Agreement”) and the Qualifying Distribution Event is the Participant’s death or becoming Disabled, then the Participant’s Accrued Benefit is modified by the following:

If the Accrued Benefit under this Plan is greater than the benefit under the Employment Agreement on an Actuarial Equivalent basis, the Participant’s Accrued Benefit under this Plan is reduced by Actuarial Equivalent benefit under the Employment Agreement.

If the benefit under the Employment Agreement on an Actuarial Equivalent basis is greater than or equal the Accrued Benefit under this Plan, the Participant shall not have an Accrued Benefit under this Plan.

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Benefit Formula Definitions:

For purposes of the Plan, “Normal Retirement Age” shall mean attainment of age 65.

For purposes of the Benefit Formula, “Years of Service” shall mean the total number of full years in which a Participant is employed by an Employer. A year of employment shall be a 365 day period (or 366 day period in the case of a leap year) that begins on the later of December 31, 2006 or the Participant’s date of hire, and for any subsequent year, commences on the anniversary of such date. The Committee in sole discretion shall determine whether any partial year of employment shall be counted as a year of service and such determination need not be the same for each year or for each Participant. In the event of a Change in Control Event, a Participant shall be credited with additional Years of Service, for the sole purpose of determining the SERP Benefit under the formula set forth in this Section 4.2, in an amount equal to one additional year of Year of Service for each year of employment completed by the Participant prior to the effective date of the Plan (not to exceed ten (10)); provided, however, that in no event shall the crediting of such additional Years of Service result in, or entitle a Participant (or his or her Beneficiary) to receive a benefit in excess of the maximum benefit that may be paid the under formula described in this Section 4.2. Additional years of service may be credited at death or becoming Disabled based on the Participant’s employment agreement, if any.

The “Compensation” of a Participant shall mean all of a Participant’s base salary received as an Employee and Bonus.

The “Average Compensation” of a Participant shall mean the highest average of a Participant’s Compensation for any three (3) full Pay Years (or, if the Participant has been employed for less than three (3) full Pay Years, the actual number of the Participants full Pay Years) out of the last ten (10) full Pay Years preceding the date benefits are being determined.

If the Participant has not completed the entire Pay Year period specified by the Average Compensation computation since his Entry Date, the Average Compensation shall be based on those full Pay Years that have been completed since his Entry Date.

The “Pay Year” shall mean the consecutive 12-month period ending on the last day of the month of December.

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15.9 Construction: The provisions of the Plan shall be construed and enforced according to the laws of the State of Florida except to the extent that such laws are superseded by ERISA and the applicable provisions of the Code.

IN WITNESS WHEREOF, this Agreement has been executed as of the day and year above stated.

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EXHIBIT A

TO

KFORCE INC. SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN

(As Amended and Restated December 31, 2006)

The purpose of this Exhibit A to the Kforce Inc. Supplement Executive Retirement Plan (“Plan”) is to set forth terms and conditions that revise, supplement or are in addition to the terms and conditions of the Principal Executive Nonqualified Defined Benefit Plan (“Basic Plan Document”) and Adoption Agreement adopted by Kforce Inc. (the “Company”) to implement the Plan. The terms of this Exhibit A shall supercede any provision of the Basic Plan Document or Adoption Agreement to the contrary.

Section 2.28: “Present Value” means the current value of a benefit that is payable in a specified form on a specified date. The basis for the calculation shall be: (a) the RP-2000 Mortality Table for Healthy Annuitants (sex distinct) and (b) an annual rate equal to the Moody’s Aa Long Term Corporate Bond Yield at month end close for December prior to the date for which the rate is to be used rounded to the nearest .25% or such other rate deemed appropriate by the Company in accordance with the Generally Accepted Accounting Principles. The actuarial assumptions may be adjusted from time to time as selected by the Company and such assumptions shall be applied consistently to all Participants.

Within one hundred and twenty (120) days following a Change in Control, the individuals who comprised the Committee immediately prior to the Change in Control (whether or not such individuals are members of the Committee following the Change in Control) may, by written consent of the majority of such individuals, appoint an independent third party administrator (the “Administrator”) to perform any or all of the Committee’s duties described in Sections 7 and 9 of the Plan, including, without limitation, the power to determine any questions arising in connection with the administration or interpretation of the Plan, and the power to make benefit entitlement determinations. Upon and after the effective date of such appointment, (i) the Company must pay all reasonable administrative expenses and fees of the Administrator, and (ii) the Administrator may only be terminated with the written consent of the majority of Participants with benefits under the Plan as of the date of such proposed termination.

If such claim relates to the contents of a notice received by the claimant, the claim must be made within sixty (60) days after such notice was received by the claimant. All other claims must be made within 180 days of the date on which the event that caused the claim to arise occurred.

14.6 Arbitration. If a claimant has complied with the foregoing provisions of this Section 14, the claimant shall have the right to submit the controversy to final and binding arbitration pursuant to the then most applicable Rules of the American Arbitration Association (“AAA”) provided, however, that unless the parties otherwise agree, the arbitration shall be before a single arbitrator selected either by mutual agreement or, failing agreement, from a list of seven arbitrators provided by AAA. In the event the

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parties are unable to agree upon such an arbitrator from such list of seven, each party shall strike one name in turn with the first to strike being chosen by lot. When only one name remains, that person shall be the parties’ arbitrator. The parties expressly waive their rights, if any, to have such matters heard by a jury or a judge, whether in state or federal court. The cost of the arbitration, including, but not limited to, any reasonable legal fees or other expenses incident thereto incurred in connection with such arbitration shall be borne by the party that is determined by the arbitrator(s) not to have prevailed with respect to the applicable claim(s). In the arbitration the Committee’s decision on appeal shall not be entitled to a presumption of correctness; rather, the dispute shall be decided de novo.

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