Exhibit 14(a)

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

POWER OF ATTORNEY

I, Scott M. Davis, hereby constitute and appoint Susan J. Lazzo, James J. Klopper, Michael S. Bloom, William T. Evers, and Kenneth N. Crowley, and each of them, my attorneys-in-fact, each with the power of substitution, for me in any and all capacities, to sign any Post-Effective Amendments to the Registration Statement of Sun Life Assurance Company of Canada (U.S.) (File No. 333-83516) under the Securities Act of 1933 and to deliver and file the same, with exhibits thereto, and other amendments in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that each of said attorneys-in-fact or his or her substitute or substitutes may do or cause to be done by virtue hereof.

This power will expire no later than twelve months from date of execution.

IN WITNESS WHEREOF, I set my hand on the date shown.

/s/ Scott M. Davis

Scott M. Davis

Dated: April 4, 2013

Masters Choice

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

POWER OF ATTORNEY

I, Larry R. Madge, hereby constitute and appoint Scott M. Davis, Susan J. Lazzo, James J. Klopper, Michael S. Bloom, William T. Evers, and Kenneth N. Crowley, and each of them, my attorneys-in-fact, each with the power of substitution, for me in any and all capacities, to sign any Post-Effective Amendments to the Registration Statement of Sun Life Assurance Company of Canada (U.S.) (File No. 333-83516) under the Securities Act of 1933 and to deliver and file the same, with exhibits thereto, and other amendments in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that each of said attorneys-in-fact or his or her substitute or substitutes may do or cause to be done by virtue hereof.

This power will expire no later than twelve months from date of execution.

IN WITNESS WHEREOF, I set my hand on the date shown.

/s/ Larry R. Madge

Larry R. Madge

Dated: April 4, 2013

Masters Choice

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

POWER OF ATTORNEY

I, Westley V. Thompson, hereby constitute and appoint Scott M. Davis, Susan J. Lazzo, James J. Klopper, Michael S. Bloom, William T. Evers, and Kenneth N. Crowley, and each of them, my attorneys-in-fact, each with the power of substitution, for me in any and all capacities, to sign any Post-Effective Amendments to the Registration Statement of Sun Life Assurance Company of Canada (U.S.) (File No. 333-83516) under the Securities Act of 1933 and to deliver and file the same, with exhibits thereto, and other amendments in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that each of said attorneys-in-fact or his or her substitute or substitutes may do or cause to be done by virtue hereof.

This power will expire no later than twelve months from date of execution.

IN WITNESS WHEREOF, I set my hand on the date shown.

/s/ Westley V. Thompson

Westley V. Thompson

Dated: April 4, 2013

Masters Choice

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

POWER OF ATTORNEY

I, Vincent A. Montiverdi, hereby constitute and appoint Scott M. Davis, Susan J. Lazzo, James J. Klopper, Michael S. Bloom, William T. Evers, and Kenneth N. Crowley, and each of them, my attorneys-in-fact, each with the power of substitution, for me in any and all capacities, to sign any Post-Effective Amendments to the Registration Statement of Sun Life Assurance Company of Canada (U.S.) (File No. 333-83516) under the Securities Act of 1933 and to deliver and file the same, with exhibits thereto, and other amendments in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that each of said attorneys-in-fact or his or her substitute or substitutes may do or cause to be done by virtue hereof.

This power will expire no later than twelve months from date of execution.

IN WITNESS WHEREOF, I set my hand on the date shown.

/s/ Vincent A. Montiverdi

Vincent A. Montiverdi

Dated: April 4, 2013

Masters Choice

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

POWER OF ATTORNEY

I, Thomas A. Bogart, hereby constitute and appoint Scott M. Davis, Susan J. Lazzo, James J. Klopper, Michael S. Bloom, William T. Evers, and Kenneth N. Crowley, and each of them, my attorneys-in-fact, each with the power of substitution, for me in any and all capacities, to sign any Post-Effective Amendments to the Registration Statement of Sun Life Assurance Company of Canada (U.S.) (File No. 333-83516) under the Securities Act of 1933 and to deliver and file the same, with exhibits thereto, and other amendments in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that each of said attorneys-in-fact or his or her substitute or substitutes may do or cause to be done by virtue hereof.

This power will expire no later than twelve months from date of execution.

IN WITNESS WHEREOF, I set my hand on the date shown.

/s/ Thomas A. Bogart

Thomas A. Bogart

Dated: April 4, 2013

Masters Choice

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

POWER OF ATTORNEY

I, Colm J. Freyne, hereby constitute and appoint Scott M. Davis, Susan J. Lazzo, James J. Klopper, Michael S. Bloom, William T. Evers, and Kenneth N. Crowley, and each of them, my attorneys-in-fact, each with the power of substitution, for me in any and all capacities, to sign any Post-Effective Amendments to the Registration Statement of Sun Life Assurance Company of Canada (U.S.) (File No. 333-83516) under the Securities Act of 1933 and to deliver and file the same, with exhibits thereto, and other amendments in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that each of said attorneys-in-fact or his or her substitute or substitutes may do or cause to be done by virtue hereof.

This power will expire no later than twelve months from date of execution.

IN WITNESS WHEREOF, I set my hand on the date shown.

/s/ Colm J. Freyne

Colm J. Freyne

Dated: April 4, 2013

Masters Choice

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

POWER OF ATTORNEY

I, Kenneth A. McCullum, hereby constitute and appoint Scott M. Davis, Susan J. Lazzo, James J. Klopper, Michael S. Bloom, William T. Evers, and Kenneth N. Crowley, and each of them, my attorneys-in-fact, each with the power of substitution, for me in any and all capacities, to sign any Post-Effective Amendments to the Registration Statement of Sun Life Assurance Company of Canada (U.S.) (File No. 333-83516) under the Securities Act of 1933 and to deliver and file the same, with exhibits thereto, and other amendments in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that each of said attorneys-in-fact or his or her substitute or substitutes may do or cause to be done by virtue hereof.

This power will expire no later than twelve months from date of execution.

IN WITNESS WHEREOF, I set my hand on the date shown.

/s/ Kenneth A. McCullum

Kenneth A. McCullum

Dated: April 4, 2013

Masters Choice

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

POWER OF ATTORNEY

I, Keith Gubbay, hereby constitute and appoint Scott M. Davis, Susan J. Lazzo, James J. Klopper, Michael S. Bloom, William T. Evers, and Kenneth N. Crowley, and each of them, my attorneys-in-fact, each with the power of substitution, for me in any and all capacities, to sign any Post-Effective Amendments to the Registration Statement of Sun Life Assurance Company of Canada (U.S.) (File No. 333-83516) under the Securities Act of 1933 and to deliver and file the same, with exhibits thereto, and other amendments in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that each of said attorneys-in-fact or his or her substitute or substitutes may do or cause to be done by virtue hereof.

This power will expire no later than twelve months from date of execution.

IN WITNESS WHEREOF, I set my hand on the date shown.

/s/ Keith Gubbay

Keith Gubbay

Dated: April 4, 2013

Masters Choice