As Filed with the Securities and Exchange Commission on September 20, 2006

REGISTRATION NO. 333-37907

811-05846

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SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM N-4

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

POST-EFFECTIVE AMENDMENT NO. 7

AND

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940

AMENDMENT NO. 73

SUN LIFE OF CANADA (U.S.) VARIABLE ACCOUNT F

(EXACT NAME OF REGISTRANT)

SUN LIFE ASSURANCE COMPANY OF CANADA (U.S.)

(NAME OF DEPOSITOR)

ONE SUN LIFE EXECUTIVE PARK

WELLESLEY HILLS, MASSACHUSETTS 02481

(ADDRESS OF DEPOSITOR'S PRINCIPAL EXECUTIVE OFFICES)

DEPOSITOR'S TELEPHONE NUMBER: (781) 237-6030

SANDRA M. DADALT, ASSISTANT VICE PRESIDENT AND SENIOR COUNSEL

SUN LIFE ASSURANCE COMPANY OF CANADA (U.S.)

112 WORCESTER STREET

WELLESLEY HILLS, MASSACHUSETTS 02481

(NAME AND ADDRESS OF AGENT FOR SERVICE)

COPIES OF COMMUNICATIONS TO:

THOMAS C. LAUERMAN, ESQ

JORDEN BURT LLP

1025 THOMAS JEFFERSON STREET, N.W.

SUITE 400 EAST

WASHINGTON, D.C. 20007

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It is proposed that this filing will become effective (check appropriate box)
/X/ immediately upon filing pursuant to paragraph (b) of Rule 485
/ / on (date) pursuant to paragraph (b) of Rule 485
/ / 60 days after filing pursuant to paragraph (a)(1) of Rule 485
/ / on (date) pursuant to paragraph (a)(1) 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

No filing fee is due because an indefinite amount of securities is deemed to have been registered in reliance on Section 24(f) of the Investment Company Act of 1940.

This Amendment No. 7 to the Registration Statement on Form N-4 (File Nos. 333-37907, 811-05846) is being filed pursuant to Rule 485(b) under the Securities Act of 1933, as amended, in order to add a supplement to the prospectus filed with Post-Effective Amendment No. 6 to the Registration Statement, which was filed on May 1, 2006. This Amendment does not otherwise delete, amend, or supercede any prospectus, statement of additional information, exhibit, or other information contained in Post-Effective Amendment No. 6 to the Registration Statement.

PART A

SUN LIFE ASSURANCE COMPANY OF CANADA (U.S.)
SUPPLEMENT DATED SEPTEMBER 20, 2006

TO PROSPECTUSES DATED MAY 1, 2006
FOR FUTURITY AND FUTURITY FOCUS

ISSUED BY SUN LIFE OF CANADA (U.S.) VARIABLE ACCOUNT F

Effective on or about November 20, 2006, a new investment option will be added to each of the above-captioned prospectuses. As a result of the addition of the investment option, each of the prospectuses will be amended and supplemented as follows:

The list of the available investment options appearing on the cover page of the prospectus is supplemented by the addition of the following investment option and corresponding investment management disclosure:

Large-Cap Growth Equity Funds

  SC FI Large Cap Growth Fund - I Class

Sun Capital Advisers LLC advises SC FI Large Cap Growth Fund (with Pyramis Global Advisors, LLC serving as the sub-advisor).

THIS SUPPLEMENT SHOULD BE READ AND RETAINED FOR FUTURE REFERENCE.

PART C

OTHER INFORMATION

Item 24. FINANCIAL STATEMENTS AND EXHIBITS

(a)	The following Financial Statements are included in the Registration Statement:
	A.	Condensed Financial Information - Accumulation Unit Values (Part A) (Incorporated herein by reference to Post-Effective Amendment No. 6 to the Registration Statement on Form N-4, File No. 333-37907, filed on May 1, 2006)
	B.	Financial Statements of the Depositor (Part B) (Incorporated herein by reference to Post-Effective Amendment No. 6 to the Registration Statement on Form N-4, File No. 333-37907, filed on May 1, 2006)
		1.	Consolidated Statements of Income, Years Ended December 31, 2005, 2004 and 2003;
		2.	Consolidated Balance Sheets, December 31, 2005 and 2004,
		3.	Consolidated Statements of Comprehensive Income, Years Ended December 31, 2005, 2004 and 2003;
		4.	Consolidated Statements of Stockholder's Equity, Years Ended December 31, 2005, 2004 and 2003;
		5.	Consolidated Statements of Cash Flows, Years Ended December 31, 2005, 2004 and 2003;
		6.	Notes to Consolidated Financial Statements; and
		7.	Report of Independent Registered Public Accounting Firm.
	C.	Financial Statements of the Registrant (Part B) (Incorporated herein by reference to Post-Effective Amendment No. 6 to the Registration Statement on Form N-4, File No. 333-37907, filed on May 1, 2006)
		1.	Statement of Condition, December 31, 2005;
		2.	Statement of Operations, Year Ended December 31, 2005;
		3.	Statements of Changes in Net Assets, Years Ended December 31, 2005 and December 31, 2004;
		4.	Notes to Financial Statements; and
		5.	Report of Independent Registered Public Accounting Firm.
(b)		The following Exhibits are incorporated in the Registration Statement by reference unless otherwise indicated:
(1)		Resolution of Board of Directors of the Depositor dated December 3, 1985 authorizing the establishment of the Registrant (Incorporated herein by reference to Exhibit 1 to Registrant's Registration Statement on Form N-4, File No. 333-37907, filed on October 14, 1997);
(2)		Not Applicable;
(3)(a)		Specimen Marketing Services Agreement between the depositor, Sun Life of Canada (U.S.) Distributors, Inc., and Clarendon Insurance Agency, Inc. (Incorporated herein by reference to Pre-effective Amendment No. 1 to the Registration Statement of the Registrant on Form N-4, File No. 333-37907, filed on January 16, 1998);
(3)(b)(i)		Specimen Sales Operations and General Agent Agreement (Incorporated herein by reference to Pre-effective Amendment No. 1 to the Registration Statement of the Registrant on Form N-4, File No. 333-37907, filed on January 16, 1998);
(3)(b)(ii)		Specimen Broker-Dealer Supervisory and Service Agreement (Incorporated herein by reference to Pre-effective Amendment No. 1 to the Registration Statement of the Registrant on Form N-4, File No. 333-37907, filed on January 16, 1998);
(3)(b)(iii)		Specimen General Agent Agreement (Incorporated herein by reference to Pre-effective Amendment No. 1 to the Registration Statement of the Registrant on Form N-4, File No. 333-37907, filed on January 16, 1998);
(4)(a)		Specimen Flexible Payment Combination Fixed/Variable Group Annuity Contract (Incorporated herein by reference to the Registration Statement of the Registrant on Form N-4, File No. 333-37907, filed on October 14, 1997);
(4)(b)		Specimen Certificate to be issued in connection with the Contract filed as Exhibit 4(a) (Incorporated herein by reference to the Registration Statement of the Registrant on Form N-4, File No. 333-37907, filed on October 14, 1997);
(5)(a)		Specimen Application to be used with the Contract filed as Exhibit 4(a) (Incorporated herein by reference to the Registration Statement of the Registrant on Form N-4, File No. 333-37907, filed on October 14, 1997);
(5)(b)		Specimen Application to be used with the Certificate filed as Exhibit 4(b) (Incorporated herein by reference to the Registration Statement of the Registrant on Form N-4, File No. 333-37907, filed on October 14, 1997);
(6)(a)		Certificate of Incorporation of the Depositor (Incorporated herein by reference to Depositor's Form 10-K, File No. 333-82824, filed on March 29, 2004);
(6)(b)		By-Laws of the Depositor, as amended March 19, 2004 (Incorporated herein by reference to Depositor's Form 10-K, File No. 333-82824, filed on March 29, 2004);
(7)		Not Applicable;
(8)(a)		Participation Agreement by and between The Alger American Fund, the Depositor, and Fred Alger and Company, Incorporated (Incorporated herein by reference to Post-Effective Amendment No. 13 to the Registration Statement of the Registrant on Form N-4, File No. 33-41628, filed April 23, 1999);
(8)(b)(i)		Participation Agreement dated February 17, 1998 by and between Goldman Sachs Variable, Insurance Trust, Goldman Sachs & Co. and the Depositor (Incorporated herein by reference to Post-Effective Amendment No. 13 to the Registration Statement of the Registrant on Form N-4, File No. 33-41628, filed April 23, 1999);
(8)(b)(ii)		Amendment No. 1 dated December 14, 1998 to Participation Agreement filed as Exhibit 8(b)(i) (Incorporated herein by reference to Post-Effective Amendment No. 13 to the Registration Statement of the Registrant on Form N-4, File No. 33-41628, filed April 23, 1999);
(8)(b)(iii)		Amendment No. 2 dated as of March 15, 1999 to Participation Agreement filed as Exhibit 8(b)(i) (Incorporated herein by reference to Post-Effective Amendment No. 13 to the Registration Statement of the Registrant on Form N-4, File No. 33-41628, filed April 23, 1999);
(8)(c)		Fund Participation Agreement between Depositor and J.P. Morgan Services Trust II (Incorporated herein by reference to Post-Effective Amendment No. 13 to the Registration Statement of the Registrant on Form N-4, File No. 33-41628, filed April 23, 1999);
(8)(d)		Participation Agreement dated February 17, 1998 by and among MFS/Sun Life Services Trust, the Depositor and Massachusetts Financial Services Company (Incorporated herein by reference to Post-Effective Amendment No. 13 to the Registration Statement of the Registrant on Form N-4, File No. 33-41628, filed April 23, 1999);
(8)(e)		Participation Agreement dated February 17, 1998 by and among OCC Accumulation Trust, the Depositor and OCC Distributors (Incorporated herein by reference to Post-Effective Amendment No. 13 to the Registration Statement of the Registrant on Form N-4, File No. 33-41628, filed April 23, 1999);
(8)(f)		Participation Agreement dated February, 1998 by and among the Depositor, Warburg Pincus Trust, Warburg Pincus Asset Management, Inc. and Counsellors Securities, Inc (Incorporated herein by reference to Post-Effective Amendment No. 13 to the Registration Statement of the Registrant on Form N-4, File No. 33-41628, filed April 23, 1999);
(8)(g)		Participation Agreement dated February 17, 1998 by and amomg the Depositor, AIM Variable Insurance Funds, Inc., AIM Distributors, Inc., and Claredon Insurance Agency, Inc.; (Incorporated herein by reference to Post-Effective Amendment No. 1 to Registrant's Registration Statement on Form N-4, File No. 333-82957, filed February 3, 2000);
(8)(h)		Participation Agreement dated August 18, 1999 by and among the Depositor, Sun Capital Advisers Trust and Sun Capital Advisers, Inc.;(Incorporated herein by reference to Post-Effective Amendment No. 1 to Registrant's Registration Statement on Form N-4, File No. 333-82957, filed February 3, 2000);
(8)(i)		Participation Agreement dated February 17, 1998 by and among the Depositor, Salomon Brothers Variable Series Funds Inc., and Salomon Brothers Asset Management Inc. (Incorporated herein by reference to Pre-Effective Amendment No. 1 to the Registration Statement on Form N-4, File No. 333-41438, filed September 25, 2000);
(9)		Opinion of Counsel and Consent to its use as to the legality of the securities being registered (Incorporated herein by reference to Pre-Effective Amendment No. 1 to the Registration Statement on Form N-4, File No. 333-37907, filed on January 16, 1998);
(10)(a)		Consent of Independent Registered Public Accounting Firm;*
(b)		Representation of Counsel pursuant to Rule 485(b);*
(11)		Financial Statement Schedules I and VI (Incorporated herein by reference from the Annual Report of the Depositor on Form 10-K for the fiscal year ended December 31, 2005, filed on March 23, 2006);
(12)		Not Applicable;
(13)		Schedule for Computation of Performance Quotations (Incorporated herein by reference to Exhibit 13 to Post-Effective Amendment No. 10 to the Registration Statement on Form N-4, File No. 33-41628, filed on April 29, 1998);
(14)		Not Applicable;
(15)		Powers of Attorney (Incorporated herein by reference to Post-Effective Amendment No. 6 to the Registration Statement on Form N-4, File No. 333-37907, filed on May 1, 2006);
(16)		Organizational Chart (Incorporated herein by reference to Exhibit 16 to Post-Effective Amendment No. 16 to the Registration Statement of the Registrant on Form N-4, File No. 333-83516, filed on April 11, 2006.

* Filed herewith.

Item 25. DIRECTORS AND OFFICERS OF THE DEPOSITOR

Thomas A. Bogart Sun Life Assurance Company of Canada 150 King Street West, SC 114D10 Toronto, Ontario Canada M5H 1J9	Director
Gary Corsi Sun Life Assurance Company of Canada (U.S.) One Sun Life Executive Park, SC 3380 Wellesley Hills, MA 02481	Director & Vice President and Chief Financial Officer and Treasurer
Scott M. Davis Sun Life Assurance Company of Canada (U.S.) One Sun Life Executive Park, SC 3358 Wellesley Hills, MA 02481	Director & Vice President and General Counsel
Paul W. Derksen Sun Life Assurance Company of Canada 150 King Street West, SC 105D10 Toronto, Ontario Canada M5H 1J9	Director
Mary M. Fay Sun Life Assurance Company of Canada (U.S.) One Sun Life Executive Park, SC 4250 Wellesley Hills, MA 02481	Director & Vice President and General Manager, Annuities
Robert C. Salipante Sun Life Assurance Company of Canada (U.S.) One Sun Life Executive Park, SC 3376 Wellesley Hills, MA 02481	President and Director
Donald A. Stewart Sun Life Assurance Company of Canada 150 King Street West, SC 106A35 Toronto, Ontario Canada M5H 1J9	Director
James M.A. Anderson Sun Life Assurance Company of Canada 150 King Street West, SC 104A25 Toronto, Ontario Canada M5H 1J9	Executive Vice President and Chief Investment Officer
Keith Gubbay Sun Life Assurance Company of Canada (U.S.) One Sun Life Executive Park, SC 3370 Wellesley Hills, MA 02481	Vice President and Chief Actuary
Michael S. Bloom Sun Life Assurance Company of Canada (U.S.) One Sun Life Executive Park, SC 1335 Wellesley Hills, MA 02481	Assistant Vice President and Senior Counsel and Secretary
John R. Wright Sun Life Assurance Company of Canada (U.S.) One Sun Life Executive Park , SC 2163 Wellesley Hills, MA 02481	Executive Vice President, Sun Life Financial U.S. Operations

Item 26. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH THE DEPOSITOR OR REGISTRANT

No person is directly or indirectly controlled by the Registrant. The Registrant is a separate account of Sun Life Assurance Company of Canada (U.S.), a wholly-owned subsidiary of Sun Life of Canada (U.S.) Holdings, Inc., a wholly-owned subsidiary of Sun Life Assurance Company of Canada-U.S. Operations Holdings, Inc., which is, in turn, a wholly-owned subsidiary of Sun Life Assurance Company of Canada.

The organization chart of Sun Life Assurance Company of Canada is filed as Exhibit 16 to Post-Effective Amendment No. 16 to the Registration Statement on Form N-4, File No. 333-83516, filed April 11, 2006.

None of the companies listed in such Exhibit 16 is a subsidiary of the Registrant, therefore the only financial statements being filed are those of Sun Life Insurance and Annuity Company of Canada (U.S.).

Item 27. NUMBER OF CONTRACT OWNERS

As of September 13, 2006, there were 335 qualified and 670 non-qualified Contracts issued and outstanding.

Item 28. INDEMNIFICATION

Pursuant to Section 145 of the Delaware Corporation Law, Article 8 of the By-laws of Sun Life Assurance Company of Canada (U.S.) provides for the indemnification of directors, officers and employees of Sun Life Assurance Company of Canada (U.S.). Insofar as indemnification for liability arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of Sun Life Assurance Company of Canada (U.S.) pursuant to the certificate of incorporation, by-laws, or otherwise, Sun Life (U.S.) has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by Sun Life (U.S.) of expenses incurred or paid by a director, officer, controlling person of Sun Life (U.S.) in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, Sun Life (U.S.) will submit to a court of appropriate jurisdiction the question whether such indemnification by them is against public policy as expressed in the Act, unless in the opinion of their counsel the matter has been settled by controlling precedent, and will be governed by the final adjudication of such issue.

Item 29. PRINCIPAL UNDERWRITERS

(a) Clarendon Insurance Agency, Inc., a wholly-owned subsidiary of Sun Life Assurance Company of Canada (U.S.), acts as general distributor for the Registrant, Sun Life of Canada (U.S.) Variable Accounts C, D, E, G, H and I, Keyport Variable Account A, KMA Variable Account, Keyport Variable Account I, KBL Variable Account A, KBL Variable Annuity Account, Sun Life (N.Y.) Variable Accounts A, B, C, and D, and Money Market Variable Account, High Yield Variable Account, Capital Appreciation Variable Account, Government Securities Variable Account, World Governments Variable Account, and Total Return Variable Account.

Name and Principal	Position and Offices
Business Address*	with Underwriter
Katherine E. Sarvary	President
Claude A. Accum	Director
Gary Corsi	Director
Mary M. Fay	Director
Michael S. Bloom	Secretary
Ann B. Teixeira	Assistant Vice President, Compliance
Thomas Horack	Chief Compliance Officer
Michael L. Gentile	Vice President
John E. Coleman	Vice President
Nancy C. Atherton	Assistant Vice President & Tax Officer

*The principal business address of all directors and officers of the principal underwriter, is One Sun Life Executive Park, Wellesley Hills, Massachusetts 02481

(b) Inapplicable.

Item 30. LOCATION OF ACCOUNTS AND RECORDS

Accounts, books and other documents required to be maintained by Section 31(a) of the Investment Company Act of 1940 and the Rules promulgated thereunder are maintained by Sun Life Assurance Company of Canada (U.S.), in whole or in part, at its executive office at One Sun Life Executive Park, Wellesley Hills, Massachusetts 02481, at the offices of Clarendon Insurance Agency, Inc. at One Sun Life Executive Park, Wellesley Hills, Massachusetts 02481.

Item 31. MANAGEMENT SERVICES

Not Applicable.

Item 32. UNDERTAKINGS

The Registrant hereby undertakes:

(a)	To file a post-effective amendment to this Registration Statement as frequently as is necessary to ensure that the audited financial statements in the Registration Statement are never more than 16 months old for so long as payments under the variable annuity Contracts may be accepted;
(b)	To include either (1) as part of any application to purchase a Contract offered by the prospectus, a space that an Applicant can check to request a Statement of Additional Information, or (2) a post card or similar written communication affixed to or included in the prospectus that the Applicant can remove to send for a Statement of Additional Information;
(c)	To deliver any Statement of Additional Information and any financial statements required to be made available under SEC Form N-4 promptly upon written or oral request.
(d)	Representation with respect to Section 26(f)(2)(A) of the Investment Company Act of 1940: Sun Life Assurance Company of Canada (U.S.) represents that the fees and charges deducted under the Contracts, in the aggregate, are reasonable in relation to the services rendered, the expenses expected to be incurred, and the risks assumed by the insurance company.
	The Registrant is relying on the no-action letter issued by the Division of Investment Management of the Securities and Exchange Commission to American Council of Life Insurance, Ref. No. IP-6-88, dated November 28, 1988, the requirements for which have been complied with by the Registrant.

SIGNATURES

As required by the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements of Securities Act Rule 485(b) for effectiveness of this Post-Effective Amendment to the Registration Statement and has caused this Post-Effective Amendment to be signed on its behalf, in the Town of Wellesley Hills, and Commonwealth of Massachusetts on the 20th day of September, 2006.

SUN LIFE OF CANADA (U.S.) VARIABLE ACCOUNT F

(Registrant)

SUN LIFE ASSURANCE COMPANY OF CANADA (U.S.)

(Depositor)

By: /s/ ROBERT C. SALIPANTE*

Robert C. Salipante

President

*By:       /s/SANDRA M. DADALT

              Sandra M. DaDalt

              Assistant Vice President

              and Senior Counsel

As required by the Securities Act of 1933, this Post-Effective Amendment to the Registration Statement has been signed by the following persons in the capacities with the Depositor and on the dates indicated.

SIGNATURE	TITLE	DATE
/s/ Robert C. Salipante	President and Director	September 20, 2006
Robert C. Salipante	(Principal Executive Officer)
/s/ Gary Corsi	Vice President, Chief Financial Officer and	September 20, 2006
Gary Corsi	Treasurer and Director
	(Principal Financial and Accounting Officer)
*By: /s/ Sandra M. DaDalt	Attorney-in-Fact for:	September 20, 2006
Sandra M. DaDalt	Donald A. Stewart, Director
	Thomas A. Bogart, Director
	Paul W. Derksen, Director
	Scott M. Davis, Director and Vice President and General           Counsel
	Mary M. Fay, Director and Vice President and General           Manager, Annuities

*Sandra M. DaDalt has signed this document on the indicated date on behalf of the above Directors for the Depositor pursuant to powers or attorney duly executed by such persons and a resolution of the Board of Directors authorizing use of powers of attorney for Officer signatures. Resolution of the Board of Directors is incorporated herein by reference to the Registration Statement of Keyport Variable Account A on Form N-4, File No. 333-112506, filed on or about February 5, 2004. Powers of attorney are incorporated herein by reference to Post-Effective Amendment No. 6 to the Registration Statement on Form N-4, File No. 333-37907, filed on May 1, 2006.

EXHIBIT INDEX

10 (a)	Consent of Independent Registered Public Accounting Firm
10 (b)	Representation of Counsel pursuant to Rule 485(b)