PRINCIPAL FUNDS, INC. AMENDED AND RESTATED DISTRIBUTION PLAN AND AGREEMENT CLASS R-4

PRINCIPAL FUNDS, INC.

AMENDED AND RESTATED

DISTRIBUTION PLAN AND AGREEMENT

CLASS R-4


	DISTRIBUTION PLAN AND AGREEMENT made as of May 4, 2010, by and between
PRINCIPAL FUNDS, INC., a Maryland corporation (the "Fund"), and PRINCIPAL FUNDS
DISTRIBUTOR, INC., a Washington corporation (the "Underwriters").

1.	This Distribution and Service Plan (the “Plan”), when effective in accordance with its terms, shall
	be the written plan contemplated by Securities and Exchange Commission Rule 12b-1 under
	the Investment Company Act of 1940, as amended (the “Act”) for the R-4 Class shares of each
	Series identified in Appendix A, attached hereto (the “Series”), a class of shares of Principal
	Funds, Inc. (the “Fund”).

2.	The Fund has entered into a Distribution Agreement on behalf of the Fund Principal Funds
	Distributor, Inc. (“Distributor”), under which the Distributor will use all reasonable efforts,
	consistent with its other business, to secure purchasers of shares of each Series of the Fund
	(the “Shares”). Such efforts may include, but neither are required to include nor are limited to,
	the following: (1) formulation and implementation of marketing and promotional activities, such
	as mail promotions and television, radio, newspaper, magazine and other mass media
	advertising; (2) preparation, printing and distribution of sales literature provided to the Fund’s
	shareholders and prospective shareholders; (3) preparation, printing and distribution of
	prospectuses and statements of additional information of the Fund and reports to recipients
	other than existing shareholders of the Fund; (4) obtaining such information, analyses and
	reports with respect to marketing and promotional activities as a Distributor may, from time to
	time, deem advisable; (5) making payment of sales commission, ongoing commissions and
	other payments to brokers, dealers, financial institutions or others who sell Shares pursuant to
	Selling Agreements; (6) paying compensation to registered representatives or other employees
	of a Distributor who engage in or support distribution of the Fund’s Shares; (7) paying
	compensation to, and expenses (including overhead and telephone expenses) of, a Distributor;
	(8) providing training, marketing and support to dealers and others with respect to the sale of
	Shares; (9) receiving and answering correspondence from prospective shareholders including
	distributing prospectuses, statements of additional information, and shareholder reports; (10)
	providing of facilities to answer questions from prospective investors about Shares; (11)
	complying with federal and state securities laws pertaining to the sale of Shares; (12) assisting
	investors in completing application forms and selecting dividend and other account options;
	(13) providing of other reasonable assistance in connection with the distribution of the Fund’s
	shares; (14) organizing and conducting of sales seminars and making payments in the form of
	transactional compensation or promotional incentives; and (15) such other distribution and
	services activities as the Fund determines may be paid for by the Fund pursuant to the terms of
	this Plan and in accordance with Rule 12b-1 of the Act.

3.	The Distribution Agreement also authorizes the Distributor to enter into Service Agreements
	with other selling dealers and with banks or other financial institutions to provide shareholder
	services to existing R-4 Class shareholders, including without limitation, services such as
	furnishing information as to the status of shareholder accounts, responding to telephone and
	written inquiries of shareholders, and assisting shareholders with tax information.

4.	In consideration for the services provided and the expenses incurred by the Distributor pursuant
	to the Distribution Agreement and Paragraphs 2 and 3 hereof, all with respect to R-4 Class
	shares of a Series of the Fund, R-4 Class of each Series shall pay to the Distributor a fee at the
	annual rate of 0.10% (or such lesser amount as the Fund Directors may, from time to time,

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	determine) of the average daily net assets of R-4 Class shares of such Series. This fee shall
	be accrued daily and paid monthly or at such other intervals as the Fund Directors shall
	determine. The determination of daily net assets shall be made at the close of business each
	day throughout the month and computed in the manner specified in the Fund’s then current
	Prospectus for the determination of the net asset value of the Fund’s R-4 Class shares. The
	Distributor may use all or any portion of the fee received pursuant to this Plan to compensate
	securities dealers or other persons who have engaged in the sale of R-4 Class shares or to pay
	any of the expenses associated with other activities authorized under Paragraphs 2 and 3
	hereof.

5.	The Fund presently pays, and will continue to pay, a management fee to Principal Management
	Corporation (the “Manager”) pursuant to a Management Agreement between the Fund and the
	Manager (the “Management Agreement”). It is recognized that the Manager may use its
	management fee revenue, as well as its past profits or its resources from any other source, to
	make payment to the Distributor with respect to any expenses incurred in connection with the
	distribution of R-4 Class shares, including the activities referred to in Paragraph 2 hereof. To
	the extent that the payment of management fees by the Fund to the Manager should be
	deemed to be indirect financing of any activity primarily intended to result in the sale of R-4
	Class shares within the meaning of Rule 12b-1, then such payment shall be deemed to be
	authorized by this Plan.

6.	This Plan shall not take effect until it has been approved (a) by a vote of at least a majority (as
	defined in the Act) of the outstanding R-4 Class shares of the Series of the Fund and (b) by
	votes of the majority of both (i) the Board of Directors of the Fund, and (ii) those Directors of the
	Fund who are not "interested persons" (as defined in the Act) of the Fund and who have no
	direct or indirect financial interest in the operation of this Plan or any agreements related to this
	Plan (the "Disinterested Directors"), cast in person at a meeting called for the purpose of voting
	on this Plan or such agreements.

7.	Unless sooner terminated pursuant to Paragraph 6, this Plan shall continue in effect for a period
	of twelve months from the date it takes effect and thereafter shall continue in effect so long as
	such continuance is specifically approved at least annually in the manner provided for approval
	of this Plan in Paragraph 6(b).

8.	A representative of each Underwriter shall provide to the Board and the Board shall review at
	least quarterly a written report of the amounts so expended and the purposes for which such
	expenditures were made.

9.	This Plan may be terminated at any time by vote of a majority of the Disinterested Directors, or
	by vote of a majority (as defined in the Act) of the outstanding R-4 Class shares of the Series of
	the Fund.

10. Any agreement of the Fund related to this Plan shall be in writing and shall provide:

	A.	That such agreement may be terminated at any time, without payment of any penalty, by
		vote of a majority of the Disinterested Directors or by a vote of a majority (as defined in the
		Act) of the outstanding R-4 Class shares of the Series of the Fund on not more than sixty
		(60) days' written notice to any other party to the agreement); and

	B.	That such agreement shall terminate automatically in the event of its assignment.

11.	While the Plan is in effect, the Fund’s board of directors shall satisfy the fund governance
	standards as defined in Securities and Exchange Commission Rule 0-1(a)(7).

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12. This Plan does not require the Manager or Distributor to perform any specific type or level of

distribution activities or to incur any specific level of expenses for activities primarily intended to

result in the sale of R-4 Class shares.

13. The Fund shall preserve copies of this Plan and any related agreements and all reports made

pursuant to Paragraph 8, for a period of not less than six years from the date of the Plan, or the

agreements or such report, as the case may be, the first two years in an easily accessible

place.

14. This Plan may not be amended to increase materially the amount of Fees provided for in

Paragraph 4 hereof unless such amendment is approved in the manner provided for initial

approval in Paragraph 6 hereof and no other material amendment to this Plan shall be made

unless approved in the manner provided for initial approval in Paragraph 6(b) hereof.

IN WITNESS WHEREOF, the parties hereto have executed and delivered this Plan as of the

first date written above.

Principal Funds, Inc.

By:

▇▇▇▇ ▇. ▇▇▇▇▇▇▇, CEO & President

Principal Funds Distributor, Inc.

By:

▇▇▇▇▇▇▇ ▇. Beer, Executive Vice-President

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PRINCIPAL FUNDS, INC.

APPENDIX A

SERIES

Bond & Mortgage Securities Fund	Preferred Securities Fund
Bond Market Index Fund	Principal Capital Appreciation Fund
Disciplined LargeCap Blend Fund	Principal LifeTime 2010 Fund
Diversified International Fund	Principal LifeTime 2015 Fund
Equity Income Fund	Principal LifeTime 2020 Fund
High Quality Intermediate-Term Bond Fund	Principal LifeTime 2025 Fund
Income Fund	Principal LifeTime 2030 Fund
Inflation Protection Fund	Principal LifeTime 2035 Fund
International Emerging Markets Fund	Principal LifeTime 2040 Fund
International Equity Index Fund	Principal LifeTime 2045 Fund
International Fund	Principal LifeTime 2050 Fund
International Growth Fund	Principal LifeTime 2055 Fund
LargeCap Blend Fund I	Principal LifeTime Strategic Income Fund
LargeCap Blend Fund II	Real Estate Securities Fund
LargeCap Growth Fund	▇▇▇ Balanced Portfolio
LargeCap Growth Fund I	▇▇▇ Conservative Balanced Portfolio
LargeCap S&P 500 Index Fund	▇▇▇ Conservative Growth Portfolio
LargeCap Value Fund	▇▇▇ Flexible Income Portfolio
LargeCap Value Fund I	▇▇▇ Strategic Growth Portfolio
LargeCap Value Fund II	Short-Term Bond Fund
LargeCap Value Fund III	Short-Term Income Fund
MidCap Blend Fund	SmallCap Blend Fund
MidCap Growth Fund	SmallCap Growth Fund
MidCap Growth Fund I	SmallCap Growth Fund I
MidCap Growth Fund III	SmallCap Growth Fund II
MidCap S&P 400 Index Fund	SmallCap S&P 600 Index Fund
MidCap Value Fund	SmallCap Value Fund
MidCap Value Fund I	SmallCap Value Fund I
Money Market Fund	SmallCap Value Fund II
Mortgage Securities Fund

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PRINCIPAL FUNDS, INC. AMENDED AND RESTATED DISTRIBUTION PLAN AND AGREEMENT CLASS R-4

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