0000779785 trpgf:S000002131Member trpgf:C000005523Member 2011-10-02 2012-10-01 0000779785 trpgf:S000002131Member 2011-10-02 2012-10-01 0000779785 2011-10-02 2012-10-01 0000779785 trpgf:S000002131Member rr:AfterTaxesOnDistributionsMember trpgf:C000005523Member 2011-10-02 2012-10-01 0000779785 trpgf:S000002131Member rr:AfterTaxesOnDistributionsAndSalesMember trpgf:C000005523Member 2011-10-02 2012-10-01 0000779785 trpgf:S000002131Member trpgf:BarclaysUSGnmaIndexMember 2011-10-02 2012-10-01 0000779785 trpgf:S000002131Member trpgf:LipperGnmaFundsAverageMember 2011-10-02 2012-10-01 pure iso4217:USD 2012-06-30 <div style="display:none">~ http://www.troweprice.com/role/ScheduleShareholderFeesTRowePriceGNMAFund column period compact * ~</div> 346 Example troweprice.com 0.0236 T. Rowe Price GNMA Fund SUMMARY Fees and Expenses of the Fund <center>Shareholder fees (fees paid directly from your investment)</center> <center>Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)</center> 0 The fund pays transaction costs, such as commissions, when it buys and sells securities (or turns over its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the funds performance. During the most recent fiscal year, the funds portfolio turnover rate was 344.3% of the average value of its portfolio. <div style="display:none">~ http://www.troweprice.com/role/ScheduleAnnualFundOperatingExpensesTRowePriceGNMAFund column period compact * ~</div> The bar chart showing calendar year returns and the average annual total returns table indicate risk by illustrating how much returns can differ from one year to the next and how fund performance compares with that of a comparable market index. 0.0189 485BPOS T. Rowe Price GNMA Fund 2012-09-27 This table describes the fees and expenses that you may pay if you buy and hold shares of the fund. 63 199 The figure shown under Total annual fund operating expenses does not match the Ratio of expenses to average net assets shown in the Financial Highlights table, as that figure does not include acquired fund fees and expenses. 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 funds operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Investments, Risks, and Performance Principal Investment Strategies Average Annual Total Returns <center> Periods ended December 31, 2011<center> 1-800-225-5132 <center><table><tr><td></td><td>Quarter Ended</td><td> Total Return</td></tr><tr><td>Best Quarter</td><td>     6/30/02</td><td>    3.56%</td></tr><tr><td>Worst Quarter</td> <td>     6/30/04</td><td>   -1.13%</td></tr></table> The fund’s return for the six months ended 6/30/12 was 1.89%.</center> 0.0903 <div style="display:none">~ http://www.troweprice.com/role/ScheduleAnnualTotalReturnsT.RowePriceGNMAFundBarChart column period compact * ~</div> In addition, the average annual total returns table shows hypothetical after-tax returns to suggest how taxes paid by a shareholder may influence returns. 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 investors tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or individual retirement account. After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or individual retirement account. 0000779785 false 2012-05-31 Investment Objective Fees and Expenses Portfolio Turnover 0 20 0.0062 The fund will normally invest at least 80% of its total assets in mortgage-backed securities issued by the Government National Mortgage Association (GNMA), an agency of the U.S. Department of Housing and Urban Development. These securities represent pools of mortgage loans that are guaranteed either by the Federal Housing Administration or the Veterans Administration. Mortgage lenders pool individual home mortgages to back a certificate or bond, which entitle the holder to a proportionate share of the principal and interest payments that are made on the underlying pool of mortgage loans. GNMA guarantees the timely payment of interest and principal on the securities it issues, a guarantee backed by the U.S. Treasury. The GNMA guarantee does not apply to the price of GNMA securities or the funds share price, both of which will fluctuate with market conditions. Up to 20% of total assets can be invested in high-quality securities that are not backed by the full faith and credit of the U.S. government. These securities must have a credit rating of at least AA (or an equivalent rating) at the time of purchase by at least one of the major credit rating agencies or, if unrated, deemed to be of comparable quality by T. Rowe Price. Such securities may include, among others, mortgage-backed securities issued by government agencies (such as the Federal National Mortgage Association and the Federal Home Loan Mortgage Corporation) that are not backed by the full faith and credit of the U.S. government and mortgage-related securities issued by private banks and other non-governmental issuers. There is no limit on the maturity of individual securities in the funds portfolio or on the funds overall weighted average maturity, which will vary and can be influenced by various factors such as the general level of interest rates, and principal prepayments of GNMA and other mortgage-backed securities. In selecting securities, the portfolio manager may weigh the characteristics of various types of mortgage-backed securities and examine yield relationships in the context of the outlook for interest rates and the economy. For example, if interest rates seem likely to fall, the portfolio manager may purchase mortgage-backed securities expected to have below-average prepayment rates with longer maturities and allocate some assets to bonds or other securities that could appreciate in that environment. The fund may purchase or sell mortgage-backed securities on a delayed delivery or forward commitment basis through the to-be-announced (TBA) market. With TBA transactions, the particular securities to be delivered are not identified at the trade date but the delivered securities must meet specified terms and standards. The fund would generally enter into TBA transactions with the intention of taking possession of the underlying mortgage-backed securities. However, in an effort to obtain underlying mortgage securities on more preferable terms or to enhance returns, the fund may extend the settlement by entering into dollar roll transactions in which the fund sells mortgage-backed securities and simultaneously agrees to purchase substantially similar securities on a future date. In addition, the fund uses interest rate futures and interest rate swaps primarily in an effort to manage its exposure to changes in interest rates or to adjust portfolio duration. The fund may sell holdings for a variety of reasons, such as to adjust the portfolios average maturity or to shift assets into and out of higher-yielding securities. As with any mutual fund, there is no guarantee that the fund will achieve its objective. The funds share price fluctuates, which means you could lose money by investing in the fund. The principal risks of investing in this fund are summarized as follows: Active management risk The fund is subject to the risk that the investment adviser’s judgments about the attractiveness, value, or potential appreciation of the fund’s investments may prove to be incorrect. If the securities selected and strategies employed by the fund fail to produce the intended results, the fund could underperform other funds with similar objectives and investment strategies. Interest rate risk This is the risk that a rise in interest rates will cause the price of a fixed rate debt security to fall. Generally, securities with longer maturities and funds with longer weighted average maturities carry greater interest rate risk. The market tends to discount prices of mortgage-backed securities for prepayment risk when interest rates decline. As a result, prices of mortgage-backed securities typically do not rise as much as the prices of comparable bonds during periods of falling interest rates. Prepayment risk This is the risk that during periods of falling interest rates, borrowers will refinance their mortgages before their maturity dates, leading to the prepayment of mortgage-backed securities held by the fund. The fund would lose potential price appreciation and may be forced to reinvest the unanticipated proceeds at lower interest rates, resulting in a decline in the funds income. Extension risk This is the risk that during periods of rising interest rates, prepayments of the underlying mortgages will occur at a slower than expected rate, thereby lengthening the average life of the mortgage-backed securities and making them more volatile. Credit risk This is the risk that an issuer of a debt security could suffer an adverse change in financial condition that results in a payment default, security downgrade, or inability to meet a financial obligation. The funds overall exposure to credit risk is relatively low because it invests significantly in higher rated securities and certain securities that are backed by the full faith and credit of the U.S. government or a federally sponsored agency. There is a relatively higher risk of default for U.S. agency issued securities that are not guaranteed by the U.S. government and an even higher risk of default for securities not backed by any government agency, although pooling mortgages helps to mitigate some of the credit risk. Liquidity risk This is the risk that the fund may not be able to sell a holding in a timely manner at a desired price. TBA/Dollar roll risk Although the securities that are delivered in TBA transactions must meet certain standards, there is a risk that the actual securities received by the fund may be less favorable than what was anticipated when entering into the transaction. TBA transactions also involve the risk that a counterparty will fail to deliver the security, exposing the fund to further losses. Whether or not the fund takes delivery of the securities at the termination date of a TBA transaction, it will nonetheless be exposed to changes in the value of the underlying investments during the term of the agreement. Finally, the funds portfolio turnover rate and transaction costs would be increased to the extent it enters into dollar roll transactions. Derivatives risk The funds use of interest rate futures and interest rate swaps involves the risks that anticipated changes in interest rates, yield curves, or prepayment rates will not be accurately predicted, the possibility of regulatory developments that could negatively affect such instruments, and the potential for losses in excess of the funds initial investment. Interest rate swaps also involve the possible failure of a counterparty to perform in accordance with the terms of the swap agreement. 0.0646 0.0492 0.0421 0.079 0.0662 0.0531 0.0374 0.0583 0.0518 0.0383 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. 2002-06-30 0.0356 2004-06-30 0.0274 0.0562 0.0646 <div style="display:none">~ http://www.troweprice.com/role/ScheduleAverageAnnualTotalReturnsTransposedTRowePriceGNMAFund column period compact * ~</div> Worst Quarter The funds share price fluctuates, which means you could lose money by investing in the fund. <center>GNMA Fund Calendar Year Returns</center> 2012-10-01 The fund seeks high current income consistent with high overall credit quality and moderate price fluctuation by investing at least 80% of its total assets in Government National Mortgage Association securities backed by the full faith and credit of the U.S. government. 0 0.0045 0 0.0015 0.0002 774 3.443 <div style="display:none">~ http://www.troweprice.com/role/ScheduleExpenseExampleTransposedTRowePriceGNMAFund column period compact * ~</div> Performance 0.0629 0.0463 0.0441 0.0695 0.0641 Updated performance information is available through troweprice.com or may be obtained by calling 1-800-225-5132. The funds past performance (before and after taxes) is not necessarily an indication of future performance. -0.0113 0.038 0.0386 0.0655 0.0635 0.0649 The bar chart showing calendar year returns and the average annual total returns table indicate risk by illustrating how much returns can differ from one year to the next and how fund performance compares with that of a comparable market index. The funds past performance (before and after taxes) is not necessarily an indication of future performance. The fund can also experience short-term performance swings, as shown by the best and worst calendar quarter returns during the years depicted. The fund's return for the six months ended Best Quarter Principal Risks 2012-10-01 Subject to certain exceptions, accounts with a balance of less than $10,000 are charged an annual $20 fee. The figure shown under "Total annual fund operating expenses" does not match the "Ratio of expenses to average net assets" shown in the Financial Highlights table, as that figure does not include acquired fund fees and expenses.