MANAGEMENT AGREEMENT

     This MANAGEMENT AGREEMENT ("Agreement") is made as of the 29th day of
November, 2006 by and between AMERICAN CENTURY INVESTMENT TRUST, a Massachusetts
business trust and registered investment company (the "Company"), and AMERICAN
CENTURY INVESTMENT MANAGEMENT, INC., a Delaware corporation (the "Investment
Manager").

     WHEREAS, the Company is registered as an open-end management investment
company under the Investment Company Act of 1940, as amended (the "1940 Act"),
and has registered its shares for public offering under the Securities Act of
1933, as amended; and

     WHEREAS, the Company is authorized to create separate funds, each with its
own separate investment portfolio of which the beneficial interests are
represented by a separate series of shares of the Company, including the two
recently created funds, Core Plus Fund and Short Duration Fund (the "New
Funds"); and

     WHEREAS, the initial shareholder of each of the New Funds, as well as a
majority of those members of the Board of Trustees of the Company (collectively
the "Board of Directors," and each Trustee independently a "Director") who are
not "interested persons" as defined in the Investment Company Act of 1940
(hereinafter referred to as the "Independent Directors") has approved the
Agreement as it relates to each of the New Funds.

     NOW, THEREFORE, IN CONSIDERATION of the mutual promises and agreements
herein contained, the parties agree as follows:

1.   INVESTMENT MANAGEMENT SERVICES. The Investment Manager shall supervise the
     investments of each Fund. In such capacity, the Investment Manager shall
     maintain a continuous investment program for each such Fund, determine what
     securities shall be purchased or sold by each Fund, secure and evaluate
     such information as it deems proper and take whatever action is necessary
     or convenient to perform its functions, including the placing of purchase
     and sale orders.

2.   COMPLIANCE WITH LAWS. All functions undertaken by the Investment Manager
     hereunder shall at all times conform to, and be in accordance with, any
     requirements imposed by:

     (a)  the Investment Company Act and any rules and regulations promulgated
          thereunder;

     (b)  any other applicable provisions of law;

     (c)  the Declaration of Trust of the Company as amended from time to time;

     (d)  the By-Laws of the Company as amended from time to time;

     (e)  the Multiple Class Plan; and

     (f)  the registration statement(s) of the Company, as amended from time to
          time, filed under the Securities Act of 1933 and the Investment
          Company Act.

3.   BOARD SUPERVISION. All of the functions undertaken by the Investment
     Manager hereunder shall at all times be subject to the direction of the
     Board of Directors, its executive committee, or any committee or officers
     of the Company acting under the authority of the Board of Directors.

4.   PAYMENT OF EXPENSES. The Investment Manager will pay all the expenses of
     each class of each Fund that it shall manage, other than interest, taxes,
     brokerage commissions, portfolio insurance, extraordinary expenses, the
     fees and expenses of the Independent Directors (including counsel fees),
     and expenses incurred in connection with the provision of shareholder
     services and distribution services under a plan adopted pursuant to Rule
     12b-1 under the Investment Company Act. The Investment Manager will provide
     the Company with all physical facilities and personnel required to carry on
     the business of each class of each Fund that it shall manage, including but
     not limited to office space, office furniture, fixtures and equipment,
     office supplies, computer hardware and software and salaried and hourly
     paid personnel. The Investment Manager may at its expense employ others to
     provide all or any part of such facilities and personnel.

5.   ACCOUNT FEES. The Board of Directors may impose fees for various account
     services, proceeds of which may be remitted to the appropriate Fund or the
     Investment Manager at the discretion of the Board of Directors. At least 60
     days' prior written notice of the intent to impose such fee must be given
     to the shareholders of the affected series.

6.   MANAGEMENT FEES.

     (a)  In consideration of the services provided by the Investment Manager,
          each class of a Fund shall pay to the Investment Manager a management
          fee that is calculated as described in this Section 6 using the fee
          schedules described herein.

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