Form of Tax Opinion

[PIF Equity Income Fund, PIF Tax-Exempt Bond Fund]

June _____, 2005

Board of Directors
PIF Equity Income Fund
680 8th Street
Des Moines, IA 50392-0200

RE:      Acquisition of Principal Equity Income Fund, Inc.
         By PIF Equity Income Fund


To the Board of Directors:

PIF Equity Income Fund, a separate series of Principal  Investors Fund,  Inc., a
Maryland  corporation  ("Acquiring"),  intends to acquire  all of the assets and
assume all of the liabilities of Principal  Equity Income Fund, Inc., a Maryland
corporation ("Target"),  in a transaction ("the Reorganization")  described in a
Form N-14 Registration Statement,  File Number 333-_____,  filed with the United
States Securities and Exchange  Commission (the "Registration  Statement") on or
about  March 10,  2005.  You have asked for an opinion  concerning  the  Federal
income tax consequences of the proposed transaction.

Acquiring is a newly formed  series that will qualify as a regulated  investment
company for purposes of Subchapter M of the United States Internal  Revenue Code
of 1986, as amended (the "Code"), and will elect to be taxed as such.

Target has qualified since its inception as a regulated  investment  company for
purposes of the Code, and has elected to be taxed as such.

Acquiring and Target are each an open-end management company registered with the
Securities and Exchange Commission and various states.

Acquiring and Target, where applicable,  have made the following representations
to the undersigned:

1.   On  the  effective  date  of the  Reorganization  ("the  Effective  Date"),
     Acquiring  will acquire all of the assets of Target  solely in exchange for
     Acquiring  voting  shares  ("Acquiring   Shares")  and  the  assumption  by
     Acquiring  of  all  of  Target's   liabilities.   Target  will  immediately
     thereafter  completely  liquidate and dissolve,  distributing the Acquiring
     Shares to Target  shareholders  in retirement of their Target shares.  Each
     holder of shares of Target  will,  as a result of the  Reorganization,  own
     shares of  Acquiring  of equal  value to the shares of Target  held by such
     holder immediately prior to the Reorganization.

2.   The  business  purpose  of the  Reorganization  will be as set forth in the
     Registration Statement.

3.   The facts relating to the Reorganization, as described in the Agreement and
     Plan of Reorganization,  as such document may be amended, ("the Plan"), and
     the representations of Acquiring and Target contained in the Plan are true,
     correct and complete.

4.   In the  Reorganization,  Acquiring will acquire all of the assets of Target
     solely in exchange for Acquiring  Shares and Acquiring's  assumption of all
     liabilities of the Target.

5.   Acquiring will not assume Target's  obligation to pay, and will not pay any
     dividends or distributions on Target's shares.

6.   The fair  market  value of the  Acquiring  Shares  received  by each Target
     shareholder  will be  approximately  equal to the fair market  value of the
     Target stock surrendered in the exchange.

7.   A number  of full and  fractional  Acquiring  Shares  equal in value to the
     aggregate net value of Target's  assets  transferred to Acquiring,  will be
     issued to Target in exchange for such assets.

8.   No cash or  property,  other than  Acquiring  Shares,  will be  directly or
     indirectly   transferred   to  Target  or  distributed  by  Target  to  its
     shareholders pursuant to the Reorganization.

9.   Acquiring  will  acquire at least 90% of the fair  market  value of the net
     assets and at least 70% of the fair market  value of the gross  assets held
     by Target  immediately  prior to the  Reorganization.  For purposes of this
     representation,  amounts  paid by Target  to  dissenters,  amounts  used by
     Target  to pay its  reorganization  expenses,  amounts  paid by  Target  to
     shareholders  who receive cash or other  property,  and all redemptions and
     distributions  (except  for  regular,  normal  dividends)  made  by  Target
     immediately  preceding  the  transfer  will be included as assets of Target
     held immediately prior to the Reorganization.

10.  Acquiring  has no plan or intention to reacquire any of its stock issued in
     the  Reorganization,  except in connection with its legal obligations under
     Section 22(e) of the Investment Companies Act of 1940.

11.  To the best of  Acquiring's  and  Target's  knowledge,  there is no plan or
     intention  by the  shareholders  of  Target  who own 5  percent  or more of
     Target,  and  there is no plan or  intention  on the part of the  remaining
     shareholders of Target, to sell, exchange, redeem or otherwise dispose of a
     number of Acquiring Shares received in the Reorganization that would reduce
     Target's  shareholders'  ownership  of  Acquiring's  shares  to a number of
     shares having a value, as of the Effective Date, of less than 50 percent of
     the  value of all of the  formerly  outstanding  shares of Target as of the
     same date. For purposes of this representation,  shares of Target exchanged
     for cash or other  property  or  exchanged  for cash in lieu of  fractional
     shares of Acquiring  will be treated as  outstanding  Target  shares on the
     Effective  Date.  Moreover,  shares of Target and shares of Acquiring  that
     were held by Target shareholders and that are otherwise sold, redeemed,  or
     disposed of prior to or subsequent to the Reorganization will be considered
     in making this representation.

12.  Immediately following the Effective Date, the former shareholders of Target
     will own,  in the  aggregate,  more than 50 percent  of the total  combined
     voting  power of all classes of shares of Acquiring  entitled to vote,  and
     more  than 50  percent  of the  total  value of all  classes  of  shares of
     Acquiring.

13.  After the  Reorganization,  Acquiring  will use the  assets  acquired  from
     Target in its  business,  except that these assets may be sold or otherwise
     disposed of in the ordinary course of Acquiring's business as an investment
     company (i.e. dispositions resulting only from investment decisions made on
     the basis of investment considerations arising after and independent of the
     Reorganization).   Any  proceeds  will  be  invested  in  accordance   with
     Acquiring's  investment  objectives.  Acquiring has no plan or intention to
     sell or  otherwise  dispose of any of the assets of Target  acquired in the
     Reorganization,  except for dispositions made in the ordinary course of its
     business.

14.  Following the Reorganization, Acquiring will continue the historic business
     of  Target  and use a  significant  portion  (i.e.,  least 34  percent)  of
     Target's  historic  business  assets in the continuing  business.  Historic
     business  assets are those of Target  acquired by it in the ordinary course
     of  its  business  and  not  in  contemplation   of,  or  as  part  of  the
     Reorganization.

15.  The liabilities of Target assumed by Acquiring and any liabilities to which
     the transferred assets of Target are subject were incurred by Target in the
     ordinary course of its business.

16.  Except as provided in the Registration Statement,  Target,  Acquiring,  and
     the  shareholders  of Target will pay their  respective  expenses,  if any,
     incurred in connection with the Reorganization.

17.  There is no  intercorporate  indebtedness  existing  between  Acquiring and
     Target that was issued, acquired, or will be settled at discount.

18.  Neither  Target nor  Acquiring  is under the  jurisdiction  of a court in a
     Title 11 or similar case within the meaning of section  368(a)(3)(A) of the
     Code.

19.  Acquiring and Target each meets the requirements of a regulated  investment
     company ("RIC") under section 368(a)(2)(F) of the Code.

20.  The  adjusted  basis  and  fair  market  value  of  the  assets  of  Target
     transferred to Acquiring will equal or exceed the sum of the liabilities to
     be assumed by  Acquiring,  plus the amount of the  liabilities,  if any, to
     which the transferred assets are subject.

21.  None of the compensation, if any, to be received by any shareholder-service
     provider of Target in respect of services or in respect of refraining  from
     the  performance  of  services  will  be  separate  consideration  for,  or
     allocable to, any of his or her Target shares. None of the Acquiring Shares
     to be  received  by any  shareholder-service  provider  of  Target  will be
     separate  consideration  for or  allocable  to, any  employment  agreement,
     consulting agreement,  covenant not to compete, or similar arrangement. Any
     compensation to be paid to any shareholder-service  provider of Target will
     be for services  actually  rendered and will be  commensurate  with amounts
     paid to third parties  bargaining at arm's length for similar  services and
     has been  bargained  for  independent  of the  negotiations  regarding  the
     consideration   to  be  issued  in  exchange  for  Target   shares  in  the
     Reorganization.

22.  Target has elected to be taxed as a RIC under section 851 of the Code,  and
     for all of its  taxable  periods  and has  qualified  for the  special  tax
     treatment afforded RICs under the Code. After the Reorganization, Acquiring
     intends to so qualify.

23.  There is no plan or intention for  Acquiring  (the issuing  corporation  as
     defined in Treasury  Regulation  section  1.368-1(b)) or any person related
     (as defined in section  1.368-1(e)(3)) to Acquiring,  to acquire during the
     five-year  period  beginning  on  the  date  of  the  Reorganization,  with
     consideration  other than Acquiring  stock,  Acquiring  stock  furnished in
     exchange for a proprietary interest in Target in the Reorganization, either
     directly or through any  transaction,  agreement,  or arrangement  with any
     other person.

24.  During  the  five-year   period  ending  on  the  Effective   Date  of  the
     Reorganization:  (i) neither Acquiring,  nor any person related (as defined
     in section  1.368-1(e)(3))  to Acquiring,  will have acquired  Target stock
     with consideration other than Acquiring Shares, (ii) neither Target nor any
     person  related (as  defined in section  1.368-1(e)(3))  without  regard to
     section  1.368-1(e)(3)(i)(A))  to Target,  will have acquired  Target stock
     with  consideration  other than Acquiring Shares or Target stock, and (iii)
     no  distributions  will have been made with  respect to Target stock (other
     than ordinary,  normal,  regular  dividend  distributions  made pursuant to
     Target's historic dividend paying practice), either directly or through any
     transaction,  agreement,  or arrangement with any other person,  except for
     (a)  cash  paid to  dissenters,  and (b)  distributions  described  in Code
     sections 852 and 4982,  as required for Target's tax  treatment as a RIC or
     to avoid Federal excise tax.

25.  The aggregate value of the  acquisitions,  redemptions,  and  distributions
     described in the two  immediately  preceding  paragraphs will not exceed 50
     percent  of  the  value  (without   giving  effect  to  the   acquisitions,
     redemptions,  and  distributions) of the proprietary  interest in Target on
     the Effective Date.

26.  Following the Effective Date, Acquiring will continue the historic business
     of Target in a  substantially  unchanged  manner and use Target's  historic
     business  assets in this business.  Acquiring's  investment  objectives and
     policies  will be identical to the  investment  objectives  and policies of
     Target,  and  Acquiring  will not  dispose of assets  received  from Target
     except in the  ordinary  course of its business as an  investment  company.
     There is no plan or intention to liquidate  Acquiring or to merge Acquiring
     into any other corporation or business trust.

27.  Acquiring  was newly  organized for the purpose of the  Reorganization  and
     will not engage in any business prior to consummation of the Reorganization
     other  than  that  required  by the  Plan.  Prior  to  the  Reorganization,
     Acquiring will have no assets.

28.  Immediately  following  consummation  of  the  Reorganization,  all  of the
     outstanding shares of Acquiring will be owned by the former shareholders of
     Target,  who will own such shares  solely by reason of their  ownership  of
     shares of Target immediately prior to the Reorganization.

29.  Immediately  following  consummation of the Reorganization,  Acquiring will
     possess  the same  assets and  liabilities,  except for assets  used to pay
     dissenters to the transaction  and assets used to pay expenses  incurred in
     connection with the transaction,  as those possessed by Target  immediately
     prior to the  Reorganization.  Assets used to pay expenses,  assets used to
     pay dissenters to the  transaction,  and all redemptions and  distributions
     (except for regular, normal dividends) made by Target immediately preceding
     the transaction will, in the aggregate, constitute less than one percent of
     the net assets of Target.  Dissenting  holders of shares will own less than
     one percent of Target shares.

30.  Target has not sold or otherwise  disposed of any of its assets (other than
     in the ordinary  course of business or to the extent  necessary to maintain
     its status as a RIC) prior to the Reorganization.

31.  Acquiring  has no plan or intention to issue  additional  Acquiring  shares
     following  the  Reorganization,  other than in the  ordinary  course of its
     operation as a series of an open-end investment company.

32.  Acquiring,  for the entire  taxable  year that will include the date of the
     Reorganization,  will  qualify  and  elect  to be  treated  as a  regulated
     investment  company,  as defined in section 851 of the Code and intends for
     that  taxable year to compute its federal  income tax under  section 852 of
     the Code.

In reliance on the information provided in the Registration  Statement,  I am of
the opinion that:

1.   The acquisition of all of the assets and liabilities of Target by Acquiring
     solely in exchange for Acquiring Shares,  followed by distribution of those
     Acquiring  Shares to  shareholders  of Target in  complete  liquidation  of
     Target,  will  constitute  a  reorganization  within the meaning of section
     368(a)(1)(F)  of the Code. Each of Acquiring and Target will be a "party to
     a reorganization" within the meaning of section 368(b) of the Code.

2.   Shareholders  of Target will  recognize no gain or loss as a consequence of
     the  surrender of their shares of Target  solely in exchange for  Acquiring
     Shares pursuant to the Reorganization. (Code Section 354).

3.   The aggregate  tax basis and holding  period of Acquiring  Shares  received
     solely in exchange  for shares of Target will be the same as the  aggregate
     tax basis and the holding period of the shares of Target exchanged therefor
     provided such shares were held as a capital  asset on the  Effective  Date.
     (Code Sections 358 and 1223(1)).

4.   Target will  recognize no gain or loss on the transfer of all of its assets
     to Acquiring  solely in exchange for Acquiring Shares and the assumption of
     all of Target'  liabilities  by  Acquiring,  and Target will not recognize
     gain  or loss  upon  the  distribution  to its  shareholders  of all of the
     Acquiring Shares in complete  liquidation of Target.  (Code Section 361 and
     357(a)).

5.   The tax basis of the assets of Target in the hands of Acquiring will be the
     same as the tax basis of those  assets  in the hands of Target  immediately
     prior to the Effective Date. (Code Section 362(b)).

6.   The  holding  period of the assets of Target  received  by  Acquiring  will
     include the period  during  which such  assets  were held by Target.  (Code
     Section 1223(2)).

7.   No gain or loss  will be  recognized  by  Acquiring  upon  the  receipt  of
     Target's  assets  solely  in  exchange  for the  Acquiring  Shares  and the
     assumption by Acquiring of all liabilities of Target. (Code Section 1032).

8.   The taxable year of Target will not end as a result of the Reorganization.

The  foregoing  opinions  are based on the  Code,  Treasury  Regulations  issued
thereunder,  published  administrative,  interpretations  thereof  and  judicial
decisions with respect thereto, all as of the date hereof (collectively the "Tax
Law"), including the requirements of section 10.37 of Circular 230. No assurance
can be given that the Tax Laws will not change.

I hereby consent to the use of this letter as an Exhibit to, and reference to it
in, the Registration Statement.

Sincerely yours,

Randy Bergstrom
Assistant Tax Counsel to Acquiring