<PAGE>

                                                                   EXHIBIT 10.54
                   THIRD AMENDED AND RESTATED PLEDGE AGREEMENT

     This THIRD AMENDED AND RESTATED PLEDGE AGREEMENT, dated as of June 30,
1999, is between TIER TECHNOLOGIES, INC. (the "Company") and JAMES L. BILDNER
("Bildner").

     WHEREAS, on February 28, 1997, Bildner entered into two promissory notes
payable to the Company totaling $1,218,800.00 due February 28, 2007 (the "First
Notes"), secured by a mortgage filed upon Bildner's residence in Manchester,
Massachusetts and a pledge agreement relating to certain shares of common stock
of the Company owned by Bildner dated as of February 28, 1997 (the "Pledge
Agreement"); and

     WHEREAS, on August 1, 1997, the First Notes were combined into one note
(the "August Note") and the Pledge Agreement was amended and restated (the
"First Amended and Restated Pledge Agreement"); and

     WHEREAS, on April 1, 1998 (the "April 1998 Note"), Bildner and the Company
amended and restated the note (and Pledge Agreement) in order to facilitate the
operation of Section 11(b) thereof with respect to adjustment for excess
collateral ("Second Amended and Restated Pledge Agreement"); and

     WHEREAS, due to fluctuations in the Company's stock price, the amount of
shares pledged pursuant to this Agreement decreases or increases each quarter,
causing administrative burdens on Bildner, the Company and other parties who may
hold the shares on behalf of Bildner; and

     WHEREAS, the Company feels that Bildner is a valued employee of the Company
and that it would be in the best interests of the Company to alleviate the
administrative burdens caused by such share fluctuations; and

     WHEREAS, Bildner and the Company wish to amend the Second Amended and
Restated Pledge Agreement by means of this "Third Amended and Restated Pledge
Agreement";

     NOW, THEREFORE, for good and valuable consideration and to secure the
payment of Bildner's indebtedness to the Company, the parties agree as follows:

1.   Bildner's Indebtedness.
     ----------------------

     (a) In connection herewith Bildner has delivered the April 1998 Note,
payable to the order of the Company in an aggregate principal amount of one
million, two hundred and eighteen thousand, eight hundred dollars
($1,218,800.00).

     (b) The number of shares of Class A Common Stock of the Company set forth
on Schedule A hereto, which are currently beneficially owned by Bildner, shall
serve as the security for the April 1998 Note (the "Shares").

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     (c) Bildner has executed the April 1998 Note and is required to secure the
April 1998 Note by a pledge of the Shares and the delivery of this Agreement.

2.   Pledge. Bildner hereby pledges to the Company, and grants to the Company a
     ------
security interest in, the following (the "Pledged Collateral"): (i) the Shares
and the certificates representing the Shares; and (ii) securities of the Company
associated with the Shares issued in connection with any stock dividend or stock
split, or securities of the Company issued in connection with a
recapitalization, merger, reorganization or similar transaction.

3.   Security for Obligations.
     ------------------------

     (a) This Agreement secures the payment of all of Bildner's present and
future obligations, duties, and liabilities under the April 1998 Note and under
this Agreement (all referred to as the "Obligations").

     (b) This Agreement shall create a continuing security interest in the
Pledged Collateral and shall (i) remain in full force and effect until payment
in full of the Obligations; (ii) be binding upon Bildner and his successors and
assigns; and (iii) inure to the benefit of the Company and its successors,
transferees, and assigns.

4.   Delivery of Pledged Shares. All certificates or instruments representing or
     --------------------------
evidencing the Shares shall be held by or on behalf of the Company under this
Agreement and shall be in suitable form for transfer by delivery, or shall be
accompanied by duly executed instruments of transfer or assignment in blank, all
in form and substance satisfactory to the Company. If Bildner fails to perform
any Obligation contained in this Agreement, the Company may itself perform, or
cause performance of, that Obligation, and the expenses of the Company incurred
in connection with that performance shall be payable by Bildner under Section 9
hereto.

5.   Representations and Warranties. Bildner represents and warrants as follows:
     ------------------------------

     (a) Bildner is the beneficial owner of the Pledged Collateral free and
clear of any lien on the Pledged Collateral except for the security interest
created by this Agreement and the other terms and conditions set forth in the
Stock Option Agreements. The Pledged Collateral is held of record by the Tier
Technologies, Inc.
Voting Trust.

     (b) The pledge of the Pledged Collateral under this Agreement creates a
valid and perfected first priority interest in the Pledged Collateral, securing
the payment of the Obligations.

     (c) No authorization, approval, or other action by, and no notice to or
filing with, any governmental authority or regulatory body is required either
(i) for the pledge by Bildner of the Pledged Collateral under this Agreement or
for the execution, delivery, or performance of this Agreement by Bildner; or
(ii) for the exercise by the Company of the voting or other rights provided for
in this Agreement or the remedies in respect of the Pledged Collateral under
this Agreement (other than restrictions under any federal or state securities
law applicable to the offer or sale of unregistered securities).

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6.   Rights in Absence of Default.
     ----------------------------

     (a) So long as there has been and is no Event of Default: (i) involving
failure to make the payment described in Section 2 of the April 1998 Note, or
(ii) involving the voluntary placement by Bildner of a lien upon all or a
significant portion of the Pledged Collateral:

         (i) Bildner shall be entitled to exercise any and all voting and other
consensual rights pertaining to any or all of the Shares.

         (ii) Securities of the Company associated with the Shares issued in
connection with any stock dividend or stock split, or securities of the Company
issued in connection with a recapitalization, merger, reorganization or similar
transaction shall be immediately delivered to the Company as Pledged Collateral
in the same form as so received (with any necessary endorsement). Any other
dividends, distributions, or interest paid or payable in respect of, or
instruments and other property received, receivable, or otherwise distributed in
respect of, or in exchange for, any Pledged Collateral shall be paid to Bildner.

         (iii) Company shall execute and deliver (or cause to be executed and
delivered) to Bildner all such proxies and other instruments as Bildner may
reasonably request for the purpose of enabling him to exercise the voting and
other rights that he is entitled to exercise pursuant to paragraph (i) of this
Section 6(a).

     (b) When and so long as there is an Event of Default (i) involving failure
to make the payment described in Section 2 of the April 1998 Note, or (ii)
involving the voluntary placement by Bildner of a lien upon all or a significant
portion of the Pledged Collateral, all rights of Bildner to exercise the voting
and other rights that he would otherwise be entitled to exercise pursuant to
Section 6(a)(i) shall cease, and all those rights shall become vested in the
Company, which shall then have the sole right to exercise those voting and other
rights.

7.   Transfers and Liens. Bildner agrees that he will not (i) sell or otherwise
     -------------------
dispose of, or grant any option with respect to, any of the Pledged Collateral
without the prior written consent of the Company; or (ii) voluntarily create any
lien upon or with respect to any of the Pledged Collateral, except for the
security interest under this Agreement.

8.   Events of Default; Remedies upon Default.
     ----------------------------------------

     (a) The following shall constitute Events of Default ("Events of Default")
under this Agreement:

         (i) If Bildner fails to perform or observe any term, covenant, or
Obligation under this Agreement or the April 1998 Note, or if any representation
or warranty made by Bildner in this Agreement or the April 1998 Note is untrue
or misleading in any material respect as of the date with respect to which that
representation or warranty was made;

         (ii) If a notice of lien, levy, or assessment is filed or recorded with
respect to all or a substantial part of the Pledged Collateral, except for a
lien that relates to current taxes not yet due

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<PAGE>

and payable, and if the applicable claim is not discharged or satisfied within
ninety (90) days of Bildner's actual knowledge of that filing or recordation
(such effected Pledged Collateral shall hereinafter be referred to as the
"Effected Collateral");

         (iii) If all or a substantial part of the Pledged Collateral is
attached, seized, or subjected to a writ or distress warrant, or is levied upon,
or comes within the possession of any receiver, trustee, custodian, or assignee
for the benefit of creditors, and that Pledged Collateral is not returned to
Bildner or the writ, distress warrant, or levy is not dismissed, stayed, or
lifted within ninety (90) days (such effected Pledged Collateral shall
hereinafter be referred to as the "Effected Collateral").

         (iv) Provided; however, with respect to subparagraphs 8(a)(ii) and
(iii) hereto, if prior to the end of such ninety (90) day period, Bildner
provides the Company with additional collateral to secure the April 1998 Note
with a fair market value equal to or exceeding the fair market value of the
Effected Collateral, which collateral may be Shares or cash (or such other
collateral, subject to the consent of the Company, which consent shall not be
unreasonably withheld) at the discretion of Bildner and which collateral Bildner
hereby agrees shall be subject to the terms of this Agreement, no Event of
Default shall be deemed to have occurred.

     (b) When and so long as there is any Event of Default, the Company may
exercise in respect of the Pledged Collateral, in addition to other rights and
remedies provided for in this Agreement or otherwise available to it, all the
rights and remedies of a secured party upon a default under the Uniform
Commercial Code in effect in the State of California at that time.

     (c) Notwithstanding anything else contained herein to the contrary, so long
as there has been and is no Event of Default: (i) involving failure to make the
payment described in Section 2 of the April 1998 Note, or (ii) involving the
voluntary placement by Bildner of a lien upon all or a significant portion of
the Pledged Collateral, Bildner shall be entitled to exercise any and all voting
and other consensual rights pertaining to any or all of the Shares.

9.   Expenses. On demand, Bildner will pay the Company all reasonable expenses,
     --------
including attorneys' fees and costs, which the Company may incur in connection
with (i) the exercise or enforcement of any of the rights of the Company under
this Agreement; or (ii) Bildner's failure to perform or observe any of the
provisions of this Agreement.

10.  Security Interest Absolute. All rights and security interests of the
     --------------------------
Company, and all Obligations of Bildner, under this Agreement shall be absolute
and unconditional irrespective of: (i) any lack of validity or enforceability of
the April 1998 Note or any other agreement or instrument relating to it; (ii)
any change in the time, manner, or place of payment of, or in any other term of,
any of the Obligations, or any other amendment or waiver of or consent to any
departure from the April 1998 Note; (iii) any exchange, release, or
non-perfection of any other collateral, or any release, amendment, or waiver of
any of the Obligations; or (iv) any other circumstance that might otherwise
constitute a defense available to, or a discharge of, Bildner in respect of the
Obligations or of this Agreement.

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<PAGE>

11.  Further Assurances. Bildner agrees that at any time and from time to time,
     ------------------
at his expense, Bildner will promptly execute and deliver all further
instruments and documents, and take all further action, that may be necessary or
desirable, or that the Company may request, in order to perfect and protect any
security interest granted or purported to be granted by this Agreement or to
enable the Company to exercise and enforce its rights and remedies under this
Agreement with respect to any Pledged Collateral.

12.  Entire Agreement; Amendment; Waiver. This Agreement and the April 1998 Note
     -----------------------------------
embody the entire agreement of the parties hereto with respect to the subject
matter of this Agreement and supersede all prior agreements with respect to that
subject matter. This Agreement may not be amended or modified except in a
writing signed by both parties. No waiver of any provision of this Agreement
shall be deemed to, or shall, operate as a waiver of any other provision,
whether or not similar, nor shall any waiver constitute a continuing waiver.
Except as expressly provided in this Agreement, no waiver shall be binding
unless executed in writing by the party making the waiver.

13.  Notices. All notices and other communications provided for under this
     -------
Agreement shall be given as follows:

If to the Company:

                            TIER TECHNOLOGIES, INC.
                        1350 Treat Boulevard, Suite 250
                            Walnut Creek, CA 94596
                         Attn: Chief Financial Officer

If to Bildner:

                               JAMES L. BILDNER
                               5 Boardman Avenue
                             Manchester, MA 01944

14.  Captions. Captions are used for reference purposes only and should be
     --------
ignored in the interpretation of the Agreement. Unless the context requires
otherwise, all references in this Agreement to Sections are to the sections of
this Agreement.

15.  Governing Law; Terms. This Agreement shall be governed by and construed in
     --------------------
accordance with the laws of the State of California applicable to contracts
wholly made and performed in the State of California. Unless otherwise defined
above, terms defined in

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Division 9 of the Uniform Commercial Code as adopted in the State of California
are used in this Agreement with their statutory meanings.

The parties have duly executed this Agreement as of the date first written
above.

TIER TECHNOLOGIES, INC.


By: /s/ George K. Ross
    -----------------------------
      George K. Ross
Its:  Executive Vice President and
Chief Financial Officer


JAMES L. BILDNER


/s/ James L. Bildner
---------------------------------
James L. Bildner

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<PAGE>

                          STOCK POWER AND ASSIGNMENT
                        SEPARATE FROM STOCK CERTIFICATE


     FOR VALUE RECEIVED and pursuant to that certain THIRD AMENDED AND RESTATED
PLEDGE AGREEMENT dated as of June 30, 1999 (the "Agreement"), the undersigned
hereby sells, assigns, and transfers to TIER TECHNOLOGIES, INC. (the "Company"),
             (          ) shares of Class A Common Stock of the Company,
------------  ----------
standing in the undersigned's name on the books of the Company represented by
Certificate No(s).        delivered herewith. The undersigned does hereby
                   ------
irrevocably constitute and appoint the Secretary of the Company as the
undersigned's attorney-in-fact, with full power of substitution, to transfer
this stock on the books of the Company. THIS ASSIGNMENT MAY ONLY BE USED AS
AUTHORIZED BY THE AGREEMENT.


JAMES L. BILDNER

/s/ James L. Bildner
-----------------------------
James L. Bildner


Instructions: Please sign this Stock Power above, but do not fill in any blanks
other than the signature lines.

The purpose of this Stock Power and Assignment Separate from Stock Certificate
is to enable the Company to acquire the Shares in accordance with the terms of
the Agreement.

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                                  SCHEDULE A

                              PLEDGED SHARES AND
                               OTHER COLLATERAL


<TABLE>
<CAPTION>
                                                                 FAIR MARKET VALUE OF SHARES         OTHER COLLATERAL
DATE                                    SHARES PLEDGED                     PLEDGED                        /VALUE
----                                    --------------                     -------                        ------
<S>                                 <C>                         <C>                                <C>
      June 30, 1999                        139,628
</TABLE>

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