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Principal Financial Group                  Principal Life Insurance Company
Des Moines, Iowa USA  50392.0001
(515) 247-5111

January 26, 1999


Board of Directors
Principal Cash Management Fund, Inc.
Principal Tax-Exempt Cash Management Fund, Inc.
711 High Street
Des Moines, Iowa 50309

RE:      Acquisition of  Principal Tax-Exempt Cash Management Fund, Inc. 
         by Principal Cash Management Fund, Inc.

To the Board of Directors and Shareholders:

Principal Cash Management Fund,  Inc.,  intends to acquire all of the assets and
assume all the liabilities of Principal Tax-Exempt Cash Management Fund, Inc., a
Maryland  corporation (the  "Tax-Exempt  Fund"),  in a transaction  described in
Application for an Order Pursuant to Section 17(b),  File No.  812-11390,  filed
with the United States Securities and Exchange Commission. You have requested an
opinion   regarding  the  federal  income  tax   consequences  of  the  proposed
transaction.

Principal Cash  Management  Fund, Inc. (the "Fund") has qualified as a regulated
investment  company for purposes of Subchapter M of the United  States  Internal
Revenue Code of 1986 (the  "Code"),  as amended,  and has elected to be taxed as
such. The Tax-Exempt Fund has made an identical election,  as well as qualifying
to pay exempt-interest dividends under section 852(b)(5).

The Fund will acquire all of the assets and assume all of the liabilities of the
Tax-Exempt  Fund in exchange for shares of the Fund.  The  Tax-Exempt  Fund will
immediately  liquidate  and  dissolve,  distributing  the  shares of the Fund to
shareholders  of the  Tax-Exempt  Fund  in  retirement  of the  shares  of  that
corporation.  Each holder of shares of the  Tax-Exempt  Fund will as a result of
the transaction own shares of the Fund.

The  following  representations  have been made by an officer of the  Tax-Exempt
Fund, the Fund or are contained in the Application  filed with the United States
Securities and Exchange Commission:

1.       The fair market  value of the shares of the Fund to be received by each
         shareholder of the Tax-Exempt Fund in the transaction  will be equal to
         the fair market value of the shares of the Tax-Exempt Fund  surrendered
         therefor.



2.       As set forth in the Application,  immediately prior to this transaction
         the Tax-Exempt  Fund will hold only cash or other  securities  that are
         eligible investments for the Fund (having previously managed its assets
         such that the tax-exempt  securities  once held by the Tax-Exempt  Fund
         have all matured or otherwise  been converted to cash or other eligible
         investments).

3.       The  liabilities,  if any, of the Tax-Exempt  Fund to be assumed by the
         Fund in the  transaction  were incurred by the  Tax-Exempt  Fund in the
         ordinary  course of business and are  associated  with the assets to be
         transferred.

4.       There is no intercorporate  indebtedness  existing between the Fund and
         the Tax-Exempt Fund that was issued,  acquired, or that will be settled
         at a discount.

5.       Following the transaction,  the Fund will not continue the historic  
         business of the Tax-Exempt Fund.

In reliance on the representations made by an officer of the Tax-Exempt Fund and
the Fund,  and the  representations  contained in the  Application,  I am of the
opinion that:

1.       The  acquisition of all of the assets and liabilities of the Tax-Exempt
         Fund in exchange for shares of the Fund followed by the distribution of
         those shares to  shareholders  of the Tax-Exempt Fund in liquidation of
         the  Tax-Exempt  Fund,  will  constitute  a taxable  transaction  under
         section 1001 of the Code and not a reorganization within the meaning of
         section 368(a)(1)(B) of the Code. This is due to the lack of continuity
         of the  historic  business  of the  Tax-Exempt  Fund  and  the  lack of
         continuity of the historic  assets of the Tax-Exempt Fund being used in
         the ongoing  operations of the Fund. (See Revenue Ruling 87-76,  1987-2
         C.B. 84.)

2.       Because the  Tax-Exempt  Fund will not have any  unrecognized  gains or
         losses in the assets  transferred to the Fund in this transaction,  the
         Tax-Exempt  Fund will not recognize any gain or loss on the transfer of
         all its assets and liabilities to the Fund.

3.       The Fund will recognize no gain or loss upon receipt of the assets and 
         assumption of the liabilities of the Tax-Exempt Fund in exchange for 
         shares of the Fund.  Code Section 1032.

4.       Because the Tax-Exempt Fund maintains and has maintained since its 
         inception a net asset value of $1 per share, and as an open-end 
         diversified management investment company, shares of its stock are 
         available for purchase at this same $1 per share and are redeemable 
         for $1 per share, it is assumed for purposes of this opinion that all 
         shareholders of the Tax-Exempt Fund have a basis in the shares held of
         $1 per share.  As a taxable exchange with the Fund, also an open-end 
         diversified management investment company with shares held at a stable
         net asset value of $1 per share, the exchange of shares, although 
         taxable, will generate no taxable gain or loss to the shareholders of 
         the Tax-Exempt Fund.  (A shareholder's basis in the shares is assumed 
         to be $1 per share regardless of whether acquired by purchase, gift, or
         inheritance.  In the unusual case of a shareholder who purchases shares
         from another shareholder at a price other than $1.00 per share  gain or
         loss would be recognized.  Such a shareholder should seek the
         advice of a tax professional to determine the consequences of 
         this exchange.)

5.       Except  for  the  unusual  case  described  in  the  parenthethical  in
         paragraph 4, above, the tax basis of the shares of the Fund acquired in
         exchange for shares of the Tax-Exempt  Fund will be the same as the tax
         basis of the shares of the Tax-Exempt  Fund exchanged  therefor ($1 per
         share). Code Section 1012.

6.       Because the exchange of shares is a taxable  event,  the holding period
         of the  shares  of the Fund  acquired  in  exchange  for  shares of the
         Tax-Exempt  Fund will begin with the  receipt of the shares of the Fund
         and not include any period  during  which the shares of the  Tax-Exempt
         Fund were held. Code Section 1223.

7.       Because the exchange of shares is a taxable  event,  the holding period
         of the assets of the  Tax-Exempt  Fund  received by the Fund will begin
         with the receipt of the assets from the Tax-Exempt Fund and not include
         any period such assets were held by the Tax-Exempt  Fund.  Code Section
         1223.

The  foregoing  opinions  are based on the  Code,  Treasury  regulations  issued
thereunder,   published  administrative  interpretations  thereof  and  judicial
decisions  with  respect  thereto  (collectively  the "Tax  Law") as of the date
hereof. No assurance can be given that the Tax Laws will not change.

I hereby consent to the filing of this opinion as an exhibit to the Registration
Statement.

Sincerely,


/s/ Randy L. Bergstrom
Randy L. Bergstrom
Counsel