As Filed with the U.S. Securities and Exchange Commission on February 17, 2011

1933 Act File No. 002-94608

1940 Act File No. 811-04165

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C.  20549
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FORM N-1A
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REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933	T
Pre-Effective Amendment No.	£
Post-Effective Amendment No. 48	T
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	T
Amendment No. 50	T
(Check appropriate box or boxes.)
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American Century Target Maturities Trust (Exact Name of Registrant as Specified in Charter)
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4500 MAIN STREET,  KANSAS CITY, MISSOURI 64111 (Address of Principal Executive Offices)                                   (Zip Code)
REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (816) 531-5575
CHARLES A. ETHERINGTON 4500 MAIN STREET,  KANSAS CITY, MISSOURI  64111 (Name and Address of Agent for Service)
It is proposed that this filing will become effective (check appropriate box)

T	immediately upon filing pursuant to paragraph (b)
£	on (date) pursuant to paragraph (b)
£	60 days after filing pursuant to paragraph (a)(1)
£	on (date) pursuant to paragraph (a)(1)
£	75 days after filing pursuant to paragraph (a)(2)
£	on (date) pursuant to paragraph (a)(2) of rule 485.
If appropriate, check the following box:
£	this post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for effectiveness of this Registration Statement amendment pursuant to Rule 485(b) promulgated under the Securities Act of 1933, as amended, and has duly caused this amendment to be signed on its behalf by the undersigned, duly authorized, in the City of Kansas City, State of Missouri on the 17th day of February, 2011.

American Century Target Maturities Trust

(Registrant)

By:

*

___________________________________

Jonathan S. Thomas

President

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement amendment has been signed by the following persons in the capacities and on the dates indicated.

SIGNATURES	TITLE	DATE
* _________________________________ Jonathan S. Thomas	President and Trustee	February 17, 2011
* _________________________________ Robert J. Leach	Vice President, Treasurer and Chief Financial Officer	February 17, 2011
_________________________________ Tanya S. Beder	Trustee	February 17, 2011
* _________________________________ John Freidenrich	Trustee	February 17, 2011
* _________________________________ Ronald J. Gilson	Chairman of the Board and Trustee	February 17, 2011
* _________________________________ Frederick L.A. Grauer	Trustee	February 17, 2011
* _________________________________ Peter F. Pervere	Trustee	February 17, 2011
* _________________________________ Myron S. Scholes	Trustee	February 17, 2011

* _________________________________ John B. Shoven Trustee February 17, 2011  

*By:        /s/ Kathleen Gunja Nelson

Kathleen Gunja Nelson

Attorney in Fact

(pursuant to Power of Attorney

dated December 16, 2009)

EXHIBIT INDEX

EXHIBIT NUMBER	DESCRIPTION OF DOCUMENT
Exhibit - 101.INS	XBRL Instance Document
Exhibit - 101.SCH	XBRL Taxonomy Extension Schema Document
Exhibit - 101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
Exhibit - 101.LAB	XBRL Taxonomy Extension Label Linkbase Document
Exhibit - 101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document