Principal LifeTime Strategic Income Fund
 
Institutional
Class R-1
Class R-2
Class R-3
Class R-4
Class R-5
Ticker Symbol(s)
PLSIX
PLAIX
PLSNX
PLSMX
PLSSX
PLSPX

Principal Funds, Inc. Summary Prospectus March 1, 2014
Before you invest, you may want to review the Fund's prospectus, which contains more information about the Fund and its risks. You can find the Fund's prospectus and other information about the Fund online at www.principalfunds.com/prospectuses. You can also get this information at no cost by calling 1-800-222-5852 or by sending an email request to prospectus@principalfunds.com.
This Summary Prospectus incorporates by reference the Statutory Prospectus for Classes R-1, R-2, R-3, R-4, R-5, Institutional shares dated March 1, 2014 and the Statement of Additional Information dated March 1, 2014 (which may be obtained in the same manner as the Prospectus).
Objective:
The Fund seeks current income, and as a secondary objective, capital appreciation.
Fees and Expenses of the Fund
This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.
Shareholder Fees (fees paid directly from your investment):     None
Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of your investment)
 
Institutional
Class
Class
R-1
Class
R-2
Class
R-3
Class
R-4
Class
R-5
Management Fees
0.03%
0.03%
0.03%
0.03%
0.03%
0.03%
Distribution and/or Service (12b-1) Fees
N/A
0.35%
0.30%
0.25%
0.10%
N/A
Other Expenses
0.01%
0.53%
0.45%
0.32%
0.28%
0.26%
Acquired Fund Fees and Expenses
0.59%
0.59%
0.59%
0.59%
0.59%
0.59%
Total Annual Fund Operating Expenses
0.63%
1.50%
1.37%
1.19%
1.00%
0.88%
Example
This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

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1 year
3 years
5 years
10 years
Institutional Class
$64
$202
$351
$786
Class R-1
153
474
818
1,791
Class R-2
139
434
750
1,646
Class R-3
121
378
654
1,443
Class R-4
102
318
552
1,225
Class R-5
90
281
488
1,084
Portfolio Turnover
As a fund of funds, the Fund does not pay transaction costs, such as commissions, when it buys and sells shares of underlying funds (or “turns over” its portfolio). An underlying fund does pay transaction costs when it buys and sells portfolio securities, and a higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the examples, affect the performance of the underlying fund and the Fund. During its most recent fiscal year, the Fund's portfolio turnover rate was 14.6 % of the average value of its portfolio.
Principal Investment Strategies
The Fund invests in underlying Principal Funds, Inc. (“PFI”) domestic and foreign equity, real asset and alternative investments, and fixed-income Funds according to an asset allocation strategy designed for investors primarily seeking current income and secondarily capital appreciation. Alternative investments aim to offer diversification beyond traditional equity and fixed-income securities and include investments in such assets as infrastructure, commodities, currencies, timber and private equity. The Fund's asset allocation is designed for investors who are approximately 15 years beyond the normal retirement age of 65. The Fund invests in PFI Institutional Class shares of underlying funds. It is managed by Principal Management Corporation (“Principal”); Principal has hired a sub-advisor, Principal Global Investors, LLC (“PGI”), to assist in managing the Fund.
Principal, with assistance from PGI, develops, implements and monitors the Fund's strategic or long-term asset class targets and target ranges, is also responsible for an active rebalancing strategy designed to identify asset classes that appear attractive over the short term and sets the percentage of Fund assets to be allocated to a particular asset class. Principal selects the underlying funds for each asset class and the target weights for each underlying fund. Principal, with assistance from PGI, may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund or changes in market forces or Fund circumstances. Principal may add, remove, or substitute underlying funds at any time.
In selecting underlying funds and target weights, Principal considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in equity securities of large market capitalization companies, growth and value stocks, fixed-income securities (including high yield or “junk” bonds), domestic and foreign securities, securities denominated in foreign currencies, investment companies (including index funds), real estate securities, derivatives, mortgage-backed securities, and U.S. government and U.S. government-sponsored securities. The underlying funds engage in derivative transactions to gain exposure to a variety of securities or asset classes or attempt to reduce risk. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use futures, options, swaps (including, for example, credit default, interest rate, and currency swaps) and forwards.

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Principal Risks
The broad diversification of the Fund is designed to cushion severe losses in any one investment sector and moderate overall price volatility. However, the Fund is subject to the particular risks of the underlying funds in the proportions in which the Fund invests in them, and its share prices will fluctuate as the prices of underlying fund shares rise or fall with changing market conditions. If you sell your shares when their value is less than the price you paid, you will lose money. The Fund operates as a fund of funds and thus bears both its own expenses and, indirectly, its proportionate share of the expenses of the underlying funds in which it invests. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The principal risks of investing in the Fund that are inherent in the fund of funds, in alphabetical order, are:
Asset Allocation Risk. A fund's selection and weighting of asset classes may cause it to underperform other funds with a similar investment objective.
Conflict of Interest Risk. The Advisor and its affiliates earn different fees from different underlying funds and may have an incentive to allocate more fund-of-fund assets to underlying funds from which they receive higher fees.
Investment Company Securities Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies in which the fund invests.
Target Date Fund Risk. There is no guarantee that this fund will provide adequate income at or through retirement.


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The principal risks of investing in the Fund that are inherent in the underlying funds, in alphabetical order, are:
Counterparty Risk. Counterparty risk is the risk that the counterparty to a derivatives contract or repurchase agreement, the borrower of a portfolio’s securities, or other obligation, will be unable or unwilling to make timely principal, interest, or settlement payments, or otherwise to honor its obligations.
Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
Derivatives Risk. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so and produce disproportionate losses.
Equity Securities Risk. The value of equity securities could decline if the issuer's financial condition declines or in response to overall market and economic conditions. A fund's principal market segment(s), such as large cap, mid cap or small cap stocks, or growth or value stocks, may underperform other market segments or the equity markets as a whole. Investments in smaller companies and mid-size companies may involve greater risk and price volatility than investments in larger, more mature companies.
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate risk and credit quality risk. The market value of fixed-income securities generally declines when interest rates rise, and an issuer of fixed-income securities could default on its payment obligations.
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
Growth Stock Risk. If growth companies do not increase their earnings at a rate expected by investors, the market price of the stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
High Yield Securities Risk. High yield fixed-income securities (commonly referred to as "junk bonds") are subject to greater credit quality risk than higher rated fixed-income securities and should be considered speculative.
Index Fund Investment Risk. More likely than not, an index fund will underperform the index due to cashflows and the fees and expenses of the fund.
Investment Company Securities Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies in which the fund invests.
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund's average portfolio duration, the more sensitive the fund will be to changes in interest rates.
Prepayment Risk. Unscheduled prepayments on mortgage-backed and asset-backed securities may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
Real Estate Securities Risk. Real estate securities are subject to the risks associated with direct ownership of real estate, including declines in value, adverse economic conditions, increases in expenses, regulatory changes and environmental problems. Investing in securities of companies in the real estate industry, subjects a fund to the special risks associated with the real estate market including factors such as loss to casualty or condemnation, changes in real estate values, property taxes, interest rates, cash flow of underlying real estate assets, occupancy rates, government regulations affecting zoning, land use and rents, and the management skill and creditworthiness of the issuer.

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Risk of Being an Underlying Fund. A fund is subject to the risk of being an underlying fund to the extent that a fund of funds invests in the fund. An underlying fund of a fund of funds may experience relatively large redemptions or investments as the fund of funds periodically reallocates or rebalances its assets. These transactions may cause the underlying fund to sell portfolio securities to meet such redemptions, or to invest cash from such investments, at times it would not otherwise do so, and may as a result increase transaction costs and adversely affect underlying fund performance.
U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities.
U.S. Government Sponsored Securities Risk. Securities issued by U.S. government-sponsored or -chartered enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. Treasury.
Value Stock Risk. The market may not recognize the intrinsic value of value stocks for a long time, or they may be appropriately priced at the time of purchase.
Performance
The following information provides an indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information online at www.principal.com or by calling 1-800-222-5852.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows, for each share class of the Fund and for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare to the returns of one or more broad-based market indices.
The R-2, R-3, R-4, R-5, and Institutional Class shares were first sold on March 1, 2001.
The R-1 Class shares were first sold on November 1, 2004.
For periods prior to the date on which the R-1 Class began operations, its performance is based on the performance of the Fund’s Institutional Class shares adjusted to reflect the fees and expenses of the R-1 Class.
The adjustments result in performance (for the periods prior to the date the R-1 Class began operations) that is no higher than the historical performance of the Institutional Class shares.
Total Returns as of December 31 each year (Institutional Class shares)

Highest return for a quarter during the period of the bar chart above:
Q3 '09
9.86
 %
Lowest return for a quarter during the period of the bar chart above:
Q4 '08
-11.26
 %

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Average Annual Total Returns
For the periods ended December 31, 2013
1 Year
5 Years
10 Years
Institutional Class Return Before Taxes
5.39%
9.50%
4.62%
Institutional Class Return After Taxes on Distributions
4.49%
8.43%
3.37%
Institutional Class Return After Taxes on Distribution and Sale of Fund Shares
3.15%
7.12%
3.20%
Class R-1 Return Before Taxes
4.53%
8.55%
3.71%
Class R-2 Return Before Taxes
4.66%
8.71%
3.87%
Class R-3 Return Before Taxes
4.81%
8.88%
4.03%
Class R-4 Return Before Taxes
5.02%
9.11%
4.23%
Class R-5 Return Before Taxes
5.13%
9.24%
4.37%
S&P Target Date Retirement Income Index (reflects no deduction for fees, expenses, or taxes)
6.28%
7.62%
4.85%
Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
-2.02%
4.44%
4.55%
Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)
33.55%
18.71%
7.88%
MSCI EAFE Index NDTR D (reflects no deduction for fees, expenses, or taxes)
22.78%
12.44%
6.91%
Principal LifeTime Strategic Income Blended Index    (reflects no deduction for fees, expenses, or taxes)
5.51%
7.83%
5.60%
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for Class R-1, R-2, R-3, R-4 and R-5 shares.
Effective March 1, 2014, the Account's primary benchmark will change from Barclays U.S. Aggregate Bond Index to the S&P Target Date Retirement Income Index because the S&P Target Date Indexes are more widely used and recognized in the industry. Performance of a blended index shows how the Fund's performance compares to an index with similar investment objectives. Performance of the components of the blended index are also shown. Effective March 31, 2013, the weightings for the Principal LifeTime Strategic Income Blended Index were 75.00% Barclays U.S. Aggregate Bond Index, 19.45% Russell 3000 ® Index, and 5.55% MSCI EAFE Index NDTR D. The custom or blended index returns reflect the allocation in effect for the time period(s) for which fund returns are disclosed. Previous weightings or allocations of the custom or blended index are not restated.
Management
Investment Advisor and Portfolio Managers:
Principal Management Corporation
James W. Fennessey (since 2007), Vice President
Jeffrey R. Tyler (since 2011), Vice President
Randy L. Welch (since 2007), Vice President
Sub-Advisor(s) and Portfolio Manager(s):
Principal Global Investors, LLC
Matthew Annenberg (since 2013), Managing Director, Asset Allocation
Dirk Laschanzky (since 2001), Portfolio Manager
Purchase and Sale of Fund Shares
There are no minimum initial or subsequent investment requirements for an eligible purchaser. You may purchase or redeem shares on any business day (normally any day when the New York Stock Exchange is open for regular trading) through your plan or intermediary; by sending a written request to Principal Funds at P.O. Box 8024, Boston, MA 02266-8024 (regular mail) or 30 Dan Road, Canton, MA 02021-2809 (overnight mail); calling us at 1-800-222-5852; or accessing our website (www.principalfunds.com).

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Tax Information
The Fund’s distributions you receive are generally subject to federal income tax as ordinary income or capital gain and may also be subject to state and local taxes, unless you are tax-exempt or your account is tax-deferred in which case your distributions would be taxed when withdrawn from the tax-deferred account.
Payments to Broker-Dealers and Other Financial Intermediaries
If you purchase the Fund through a broker-dealer or other financial intermediary (such as a bank, insurance company, investment adviser, etc.), the Fund and its related companies may pay the intermediary for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment, or to recommend one share class of the Fund over another share class. Ask your salesperson or visit your financial intermediary's website for more information.


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