Exhibit (h)(13)

December 11, 2009

Janus Aspen Series
151 Detroit Street
Denver, Colorado 80206

Ladies and Gentlemen:

As you know, Section 5 of our Investment Advisory Agreement dated July 1, 2004,
as amended, provides for compensation payable to Janus Capital Management LLC
("JCM") with respect to Global Technology Portfolio (the "Fund"). This letter is
to inform you that JCM will waive a portion of its fee from May 1, 2010 until
May 1, 2011, under the following conditions:

     In the event the operating expenses allocated to any class of the Fund,
     including the amount payable to JCM pursuant to Section 5 of the Investment
     Advisory Agreement, for any fiscal year ending on a date on which this
     Agreement is in effect, exceed 0.95% of average daily net assets, JCM shall
     reduce its fee payable with respect to the Fund by the extent of such
     excess and/or shall reimburse the Fund (or class as applicable) by the
     amount of such excess; provided, however, there shall be excluded from such
     expenses the 12b-1 fee payable by Service Shares of the Fund, the
     "Performance Adjustment" if the Fund has a performance-based investment
     advisory fee, as well as the amount of any items not normally considered
     operating expenses such as interest, dividends, taxes, brokerage
     commissions, distribution fees and extraordinary expenses (including, but
     not limited to, legal claims and liabilities and litigation costs, acquired
     fund fees and expenses and any indemnification related thereto) paid or
     payable by the Fund. Operating expenses shall be calculated net of balance
     credits and similar offset arrangements (excluding directed brokerage
     arrangements). Whenever the expenses allocated to any class of the Fund
     exceed a pro rata portion of the applicable annual expense limitations, the
     estimated amount of reimbursement under such limitations shall be offset
     against the monthly payment of the fee due to JCM and/or paid by JCM to the
     Fund (or applicable class). The waiver or reimbursement shall be allocated
     to each class of the Fund in the same manner as the underlying expenses or
     fees were allocated.

This waiver/reimbursement will continue in effect until May 1, 2011, unless
extended. This waiver/reimbursement is applicable only to the Fund and shall not
be applicable to any other series of Janus Aspen Series, whether now existing or
hereafter created.

JANUS CAPITAL MANAGEMENT LLC            JANUS ASPEN SERIES


By: /s/ Michelle R. Rosenberg           By: /s/ Stephanie Grauerholz-Lofton
    ---------------------------------       ------------------------------------
     Michelle R. Rosenberg                  Stephanie Grauerholz-Lofton
     Vice President and Assistant           Vice President, Legal Counsel and
     General Counsel                        Secretary