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SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 11-K

For the fiscal year ended December 31, 2016

For the Transition Period From                  to                 

Commission File Number 001-37845

MICROSOFT CORPORATION SAVINGS PLUS 401(k) PLAN

Microsoft Corporation

One Microsoft Way

Redmond, Washington 98052-6399

REQUIRED INFORMATION

The Microsoft Corporation Savings Plus 401(k) Plan (the “Plan”) is subject to the Employee Retirement Income Security Act of 1974 (“ERISA”). Therefore, in lieu of the required information outlined as Items 1-3 of the Form 11-K, the statements of net assets available for benefits and the related statements of changes in net assets available for benefits as of and for the years ended December 31, 2016 and 2015, which have been prepared in accordance with the financial reporting requirements of ERISA, are attached hereto as Appendix 1 and incorporated herein by this reference.

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SIGNATURES

The Plan.    Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the employee benefit plan) have duly caused this annual report on Form 11-K to be signed on its behalf by the undersigned hereunto duly authorized.

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APPENDIX 1

MICROSOFT CORPORATION

SAVINGS PLUS 401(k) PLAN

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM;

FINANCIAL STATEMENTS AS OF AND FOR THE YEARS ENDED DECEMBER 31, 2016 AND 2015;

NOTES TO FINANCIAL STATEMENTS; AND

SUPPLEMENTAL SCHEDULE OF ASSETS (HELD AT END OF YEAR) AS OF DECEMBER 31, 2016

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MICROSOFT CORPORATION

SAVINGS PLUS 401(k) PLAN

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Participants and Administrators of the Microsoft Corporation Savings Plus 401(k) Plan Redmond, WA

We have audited the accompanying statements of net assets available for benefits of the Microsoft Corporation Savings Plus 401(k) Plan (the “Plan”) as of December 31, 2016 and 2015, and the related statements of changes in net assets available for benefits for the years then ended. These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. The Plan is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such financial statements present fairly, in all material respects, the net assets available for benefits of the Plan as of December 31, 2016 and 2015, and the changes in net assets available for benefits for the years then ended in conformity with accounting principles generally accepted in the United States of America.

The supplemental schedule of assets (held at end of year) as of December 31, 2016 has been subjected to audit procedures performed in conjunction with the audit of the Plan’s financial statements. The supplemental schedule is the responsibility of the Plan’s management. Our audit procedures included determining whether the supplemental schedule reconciles to the financial statements or the underlying accounting and other records, as applicable, and performing procedures to test the completeness and accuracy of the information presented in the supplemental schedule. In forming our opinion on the supplemental schedule, we evaluated whether the supplemental schedule, including its form and content, is presented in compliance with the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. In our opinion, such schedule is fairly stated, in all material respects, in relation to the financial statements as a whole.

/S/ DELOITTE & TOUCHE LLP

Seattle, Washington

June 28, 2017

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MICROSOFT CORPORATION

SAVINGS PLUS 401(k) PLAN

STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS

See accompanying notes.

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MICROSOFT CORPORATION

SAVINGS PLUS 401(k) PLAN

STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS

See accompanying notes.

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MICROSOFT CORPORATION

SAVINGS PLUS 401(k) PLAN

NOTES TO FINANCIAL STATEMENTS

NOTE 1 — DESCRIPTION OF THE PLAN AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Plan Description

The Microsoft Corporation Savings Plus 401(k) Plan (the “Plan”), a defined contribution plan, is sponsored by Microsoft Corporation (the “Company” or “Microsoft”). Participating employers included in the Plan are Microsoft Corporation; MOL Corporation; Vexcel Corporation; Microsoft Online, Inc; Microsoft Payments, Inc; Microsoft Open Technologies, Inc; and Microsoft Technology Licensing. These entities represent Microsoft or wholly owned subsidiaries of Microsoft. The Plan year is January 1 through December 31. The Plan is administered by the 401(k) Administrative Committee (the “Plan Administrator”) and subject to the provisions of the Employee Retirement Income Security Act of 1974. The information below summarizes certain aspects of the Plan as in effect during 2016 and 2015, and is intended to be a summary only. Plan participants should refer to the Summary Plan Description for more complete information.

Accounting Principles

The financial statements and accompanying notes are prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”).

Eligibility

Regular and retail services employees of participating employers who are on U.S. payroll and have reached age 18 may enroll in the Plan at any time.    

Eligible Compensation

Eligible compensation includes wages, salary, bonuses, commissions, and overtime. Compensation does not include, for example, items such as stock awards, amounts realized on the exercise of Microsoft stock options, reimbursements or other expense allowances, fringe benefits (cash and noncash), moving expenses, deferred compensation, welfare plan benefits including health or life insurance, or bonuses or expense allowances which are not based upon performance as an employee.

Contributions

Participant Contributions

Participants may contribute to the Plan on a pre-tax and/or Roth basis using eligible compensation each pay period, subject to regulatory limitations. Participants reaching age 50 or older by the end of the Plan year may also elect to make additional catch-up contributions to the Plan on a pre-tax and/or Roth basis. Additionally, all participants may contribute up to $20,000 annually on an after-tax basis. A participant’s aggregate contribution election (combined pre-tax, Roth, pre-tax catch-up, Roth catch-up and after-tax) may not exceed 75 percent of their eligible compensation per pay period. Participants may elect to suspend their contributions at any time and may elect to reinstate their contributions at any subsequent entry date.

Participants may also choose to make rollover contributions to the Plan of amounts received from an eligible employer plan maintained by another company, including direct rollovers from such plans.

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Employer Contributions

The Company provides participants with a matching contribution on eligible pre-tax and/or Roth contributions. Beginning in January 2016, the Company increased their pre-tax matching contribution to $0.50 for every $1.00 contributed on a pre-tax and/or Roth basis (up to 50 percent of the maximum annual 401(k) pre-tax and Roth contribution limit of $18,000 for 2016). In 2015, the Company made a pre-tax matching contribution of $0.50 for every $1.00 contributed (up to a 6 percent combined pre-tax and Roth contribution rate). The maximum Company match in 2015 was 3 percent of a participant’s eligible compensation. Participants do not receive a match on catch-up or after-tax contributions.

Transfers

Nokia Corporation’s (“Nokia”) Devices and Services Business was acquired by the Company in 2014 and the Nokia Plan assets merged into the Plan during 2015. The merged amounts are included as transfers in on the statement of changes in net assets available for benefits for the year ended December 31, 2015.

Employee Stock Ownership Plan Feature

The Plan includes an Employee Stock Ownership Plan (“ESOP”) feature for the portion of the Plan designed to invest primarily in Microsoft Common Stock. The ESOP feature allows participants to either reinvest their cash dividends earned on Microsoft Common Stock or receive those dividends in cash. Amounts invested in Microsoft Common Stock are treated as being held through the ESOP, provided that at the time such amounts were received by the Plan (e.g., through contributions or transfers), the participants whose Plan accounts received such assets were employed by Microsoft or a corporation that is part of the same controlled group of corporations as Microsoft.

Participants who are not employed by an employer established as a corporation that is part of the same controlled group of corporations as Microsoft may not participate in the ESOP, but may invest their contributions and earnings in Microsoft Common Stock. Participants that are not eligible to participate in the ESOP feature are not eligible to receive dividends on Microsoft Common Stock in cash paid directly to them. Instead, dividends paid on contributions invested in Microsoft Common Stock and the earnings that accumulate on those contributions will automatically be reinvested in Microsoft Common Stock.

Effective January 1, 2016, the investment of new contributions or transfer of existing account holdings into Microsoft Common Stock within the Plan was discontinued. Participant accounts with existing Microsoft Common Stock can retain those holdings, and dividends on Microsoft Common Stock can continue to be reinvested or received in cash.

Participant Accounts

Each participant’s account is credited with (a) participant contributions and employer contributions, and (b) the allocation of Plan earnings and expenses, based on participant earnings or account balances, as defined. The benefit to which a participant is entitled is the benefit that can be provided from the participant’s vested account. All amounts in participant accounts are participant-directed. Participants may invest in various instruments including mutual funds, common collective trusts, and separately managed accounts. Participants also have the option to direct their investments through a brokerage account.

Vesting

Participants are fully vested in Plan accounts at all times.

Distributions

Active participants may take a withdrawal from the Plan in the event of a financial hardship. A hardship withdrawal is limited to the amount necessary to meet the participant’s immediate financial need, and further limited to pre-tax contributions, voluntary after-tax contributions, pre-tax catch-up contributions, and rollover

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contributions (excluding rollover contributions attributable to designated Roth contributions, Roth in-plan conversion amounts, and earnings thereon, and acquisition rollovers). A hardship withdrawal will result in a six-month suspension of contributions (other than rollover contributions) to the Plan. Active participants may also take a withdrawal from their rollover and after-tax account types within the Plan without meeting one of the hardship criteria.

After reaching age 59 ¹⁄₂, active participants may withdraw all, or any portion, of the balance in their accounts. Distributions, in full or any portion, may also occur if the participant terminates employment, retires, becomes permanently disabled, or dies. Distributions of investments in Microsoft Common Stock may be taken in the form of Microsoft Common Stock or cash. Distributions may be made in installments.

In-Plan Roth Conversions

Active participants may convert their Plan distribution-eligible balances to their Roth account within the Plan.

Administrative Expenses

Plan administrative expenses are paid by the Company to the extent not offset by expense reimbursements. Participants are responsible for fees associated with certain transactions such as loan originations and maintenance, domestic relations order qualifications, and dividend checks. Participants also pay commission charges to Fidelity for buying and selling Microsoft Common Stock within the Plan.

Plan Amendment and Termination

The Company has the right to amend or terminate the Plan. If the Plan is terminated, all account balances will be distributed in the form and manner determined by the Plan Administrator.

Risks and Uncertainties

The Plan utilizes various investment instruments, including common stock, mutual funds, common collective trusts, and separately managed accounts. Investment securities, in general, are exposed to various risks, such as interest rate risk, credit risk, and overall market volatility. Due to the level of risk associated with certain investment securities, it is reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect the amounts reported in the financial statements.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and changes therein. Actual results could differ from these estimates and assumptions. The Plan has no contingent assets or liabilities for any periods presented in these financial statements.

Valuation of Investments

Investments are recorded at fair value. Security transactions are accounted for as of the trade date. Dividend income is recorded on the ex-dividend date, and interest income is recorded as earned.

Participant Loans

Participant loans are measured at their unpaid principal balance plus any accrued but unpaid interest, and participant loans deemed distributed due to default are included in benefits paid to participants on the statements of changes in net assets available for benefits.

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Other Receivables and Payables

Other receivables and payables as of December 31, 2016 and 2015 primarily consist of unsettled trades. Other receivables also include accrued interest.

NOTE 2 — PARTICIPANT LOANS

Participant loans are available in $100 increments ranging from $1,000 to $50,000. The maximum loan amount is the lesser of (a) 50 percent of the vested account balance, reduced by the current outstanding balance of all other loans from the Plan; or (b) $50,000, reduced by: (1) the current outstanding balance of all other loans from the Plan, and (2) the excess (if any) of all Plan loans during the previous 12 months over the current outstanding balance of Plan loans. Participants are limited to two loans—one Primary Residence Loan and one General Loan. The term of a Primary Residence Loan may not exceed 15 years (or 30 years for Nokia Plan legacy loans) or be less than 12 months. The term of a General Loan may not exceed five years (or 15 years for Nokia Plan legacy loans) or be less than 12 months.

The interest rate for participant loans is 1 percent plus the prime rate on corporate loans. The range of interest rates for outstanding Primary Residence Loans as of December 31, 2016 was 3.25 percent to 9.00 percent, maturing at various dates through March 2044. The range of interest rates for outstanding General Loans as of December 31, 2016 was 3.25 percent to 4.50 percent, maturing at various dates through January 2022.

Loan repayments are made through after-tax payroll deductions. Terminated employees have 60 days to elect to continue to make loan repayments or payoff the loan in full. Failure of the terminated employee to establish a loan repayment service or payoff the loan in full during this 60-day window results in a default of the loan, which is taxable income to the participant.

NOTE 3 — TAX STATUS

The Internal Revenue Service has determined and informed the Plan by a letter dated August 21, 2014, that the Plan is qualified as a tax-exempt plan under the appropriate sections of the Internal Revenue Code (“IRC”). The determination letter covered Plan amendments adopted from September 17, 2010 through August 5, 2014, and the trust agreement with Fidelity adopted on July 19, 2013. The Plan has been amended since receiving the determination letter; however, the Plan Administrator believes that the Plan is currently designed and operated in compliance with the applicable requirements of the IRC. Therefore, the Plan is tax-exempt as of the financial statement date and no provision for income taxes has been recorded in the financial statements.

NOTE 4 — PARTY-IN-INTEREST TRANSACTIONS

Certain Plan investments include shares of mutual funds that are managed by affiliates of Fidelity. Fidelity is the trustee and third-party administrator as defined by the Plan; therefore, these transactions qualify as party-in-interest transactions.

Transactions in Microsoft Common Stock also qualify as party-in-interest transactions. As of December 31, 2016 and 2015, the Plan held 19,376,026 shares of Microsoft Common Stock valued at $1,204,026,250 and 20,830,786 shares of Microsoft Common Stock valued at $1,155,692,023, respectively. During the years ended December 31, 2016 and 2015, the Plan recorded Microsoft Common Stock dividend income of $29,480,318 and $27,457,802, respectively.

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NOTE 5 — FINANCIAL INSTRUMENTS

The Plan accounts for certain assets and liabilities at fair value. The hierarchy below lists three levels of fair value based on the extent to which inputs used in measuring fair value are observable in the market. The Plan categorizes each of its fair value measurements in one of these three levels based on the lowest level input that is significant to the fair value measurement in its entirety. These levels are:

The Plan’s common collective trusts are valued using the Net Asset Value (“NAV”) provided by the trustee in order to estimate fair value. The NAV is based on the fair value of the underlying investments held by the fund less its liabilities. In the event the Plan were to initiate a full redemption of a common collective trust, the investment advisor reserves the right to temporarily delay withdrawal from the common collective trust in order to ensure that securities liquidations will be carried out in an orderly business manner. The common collective trusts have no unfunded commitments, other redemption restrictions, or redemption notice periods. The portfolios are comprised of a mix of stocks, bonds, commodities, and cash.

Financial Instruments Measured at Fair Value

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The significance of transfers between levels is evaluated based upon the nature of the financial instrument and the size of the transfer relative to the total net assets available for benefits. No significant transfers occurred between Level 1 and Level 2 for the years ended December 31, 2016 and 2015.

NOTE 6 — DERIVATIVES

Investment managers acting under the Plan use derivative instruments to manage risks related to foreign currencies and interest rates, to enhance investment returns for the Plan, and to facilitate Plan portfolio diversification. The Plan’s derivatives consisted of over-the-counter foreign exchange forward contracts and exchange-traded futures contracts, as well as put and call options, for which no hedge accounting treatment is applied. The related notional amounts, gross fair values, and amounts recognized in earnings were immaterial as of and for the years ended December 31, 2016 and 2015. These derivative instruments are a component of the “Other” caption of separately managed accounts in Note 5—Financial Instruments.

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NOTE 7 — RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500

The following is a reconciliation of net assets available for benefits per the financial statements to net assets per the Form 5500, which is the annual return/report for the Plan:

The following is a reconciliation of benefits paid to participants per the financial statements to the Form 5500:

Benefits payable are recorded on the Form 5500 for payments to participants who requested payment by December 31, but had not been paid as of that date.

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MICROSOFT CORPORATION

SAVINGS PLUS 401(k) PLAN

EMPLOYER ID 91-1144442, PLAN 001

SUPPLEMENTAL SCHEDULE OF ASSETS (HELD AT END OF YEAR)

AS OF DECEMBER 31, 2016

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