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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

For the quarterly period ended March 31, 2006

OR

For the transition period from                     to                     

Commission file number: 000-50726

Google Inc.

(Exact name of registrant as specified in its charter)

1600 Amphitheatre Parkway

Mountain View, CA 94043

(Address of principal executive offices)

(Zip Code)

(650) 253-4000

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of “accelerated filer and large accelerated filer” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer  x        Accelerated filer  ¨        Non-acclerated filer  ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act)    Yes  ¨    No  x

At April 30, 2006, the number of shares outstanding of Google’s Class A common stock was 214,947,093 shares and the number of shares outstanding of Google’s Class B common stock was 88,138,358 shares.

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GOOGLE INC.

INDEX

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PART I—FINANCIAL INFORMATION

GOOGLE INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(in thousands, except par value)

See accompanying notes.

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GOOGLE INC.

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(in thousands, except per share amounts)

See accompanying notes.

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GOOGLE INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

See accompanying notes.

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GOOGLE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Note 1. Google Inc. and Summary of Accounting Policies

Nature of Operations

We were incorporated in California in September 1998. We were re-incorporated in the State of Delaware in August 2003. We provide highly targeted advertising and global Internet search solutions as well as intranet solutions via an enterprise search appliance.

Basis of Consolidation

The condensed consolidated financial statements include the accounts of Google and our wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated.

Unaudited Interim Financial Information

The accompanying condensed consolidated balance sheet as of March 31, 2006, the condensed consolidated statements of income for the three months ended March 31, 2005 and 2006, and the condensed consolidated statements of cash flows for the three months ended March 31, 2005 and 2006 are unaudited. These unaudited interim condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles. In our opinion, the unaudited interim condensed consolidated financial statements include all adjustments of a normal recurring nature necessary for the fair presentation of our financial position as of March 31, 2006, our results of operations for the three months ended March 31, 2005 and 2006, and our cash flows for the three months ended March 31, 2005 and 2006. The results of operations for the three months ended March 31, 2006 are not necessarily indicative of the results to be expected for the year ending December 31, 2006.

These unaudited interim condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in our 2005 Annual Report on Form 10-K filed on March 16, 2006.

Use of Estimates

The preparation of interim condensed consolidated financial statements in conformity with accounting principles generally accepted in the United States requires us to make estimates and assumptions that affect the amounts reported and disclosed in the financial statements and the accompanying notes. Actual results could differ materially from these estimates. On an ongoing basis, we evaluate our estimates, including those related to the accounts receivable and sales allowances, fair values of marketable securities and investments, fair values of acquired intangible assets and goodwill, useful lives of intangible assets and property and equipment, fair values of options to purchase our common stock, and income taxes, among others. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities.

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GOOGLE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Revenue Recognition

The following table presents our revenues (in thousands):

In the first quarter of 2000, we introduced our first advertising program through which we offered advertisers the ability to place text-based ads on Google web sites targeted to users’ search queries. Advertisers paid us based on the number of times their ads were displayed on users’ search results pages and we recognized revenue at the time these ads appeared. In the fourth quarter of 2000, we launched Google AdWords, an online self-service program that enables advertisers to place text-based ads on Google web sites. AdWords is also available through our direct sales force. AdWords advertisers originally paid us based on the number of times their ads appeared on users’ search results pages. In the first quarter of 2002, we began offering AdWords exclusively on a cost-per-click basis, so that an advertiser pays us only when a user clicks on one of its ads. We recognize as revenue the fees charged advertisers each time a user clicks on one of the text-based ads that are displayed next to the search results on Google web sites. From January 1, 2004 until the end of the first quarter of 2005, the AdWords cost-per-click pricing structure was the only structure available to our advertisers. However, during the second quarter of 2005, we launched an AdWords program that enables advertisers to pay us based on the number of times their ads appear on Google Network member sites specified by the advertiser. We recognize as revenue the fees charged advertisers each time their ads are displayed on the Google Network member sites.

In the third quarter of 2005, we launched the Google Publication Ads Program through which we distribute our advertisers’ ads for publication in magazines. We recognize as revenue the fees charged advertisers when ads are published in magazines. Also in the first quarter of 2006, we acquired dMarc Broadcasting, Inc. (dMarc), a digital solutions provider for the radio broadcast industry. dMarc, now one of our wholly-owned subsidiaries, distributes our advertisers’ ads for broadcast by radio stations. We recognize as revenue the fees charged advertisers each time an ad is broadcasted or a listener responds to that ad. We consider the magazines and radio stations that participate in these programs to be members of our Google Network.

Google AdSense is the program through which we distribute our advertisers’ ads for display on the web sites of our Google Network members. In accordance with Emerging Issues Task Force (“EITF”) Issue No. 99-19, Reporting Revenue Gross as a Principal Versus Net as an Agent (EITF 99-19), we recognize as revenues the fees charged advertisers each time a user clicks on one of the text-based ads that are displayed next to the search results or on the content pages of our Google Network members’ web sites and, for those advertisers who use our cost-per impression pricing, the fees charged advertisers each time an ad is displayed on our members’ sites. Finally, we recognize as revenues the fees charged advertisers for ads published in the magazines or broadcasted by the radio stations of our Google Network members. These revenues are reported on a gross basis primarily because we are the primary obligor to our advertisers.

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GOOGLE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

We generate fees from search services through a variety of contractual arrangements, which include per-query search fees and search service hosting fees. Revenues from set-up and support fees and search service hosting fees are recognized on a straight-line basis over the term of the contract, which is the expected period during which these services will be provided. Our policy is to recognize revenues from per-query search fees in the period queries are made and results are delivered.

We provide search services pursuant to certain AdSense agreements. We believe that search services and revenue share arrangements represent separate units of accounting pursuant to EITF 00-21 Revenue Arrangements with Multiple Deliverables. These separate services are provided simultaneously to the Google Network member and are recognized as revenues in the periods provided.

In the first quarter of 2006, we launched Google Video through which we make video owned by others available for download and purchase by end users. We recognize as revenue the fees we receive from end users to the extent we are the primary obligor to them; however, to the extent we are not, we recognize as revenues the fees we receive from end users net of the amounts we pay to our video content providers in accordance with EITF 99-19.

We also generate fees from the sale and license of our Search Appliance, which includes hardware, software and 12 to 24 months of post-contract support. We recognize revenue in accordance with Statement of Position 97-2, Software Revenue Recognition, as amended. For transactions in which the elements are not sold separately, sufficient vendor-specific objective evidence does not exist for the allocation of revenue. As a result, the entire fee is recognized ratably over the term of the post-contract support arrangement.

Deferred revenue is recorded when payments are received in advance of our performance in the underlying agreement on the accompanying condensed consolidated balance sheets.

Cost of Revenues

Cost of revenues consists primarily of traffic acquisition costs. Traffic acquisition costs consist of amounts ultimately paid to Google Network members, as well as to partners who direct search queries to our web site. These amounts are primarily based on revenue share arrangements under which we pay our Google Network members and other partners a portion of the fees we receive from our advertisers. In addition, certain AdSense agreements obligate us to make guaranteed minimum revenue share payments to Google Network members based on their achieving defined performance terms, such as number of search queries or advertisements displayed. We amortize guaranteed minimum revenue share prepayments (or accrete an amount payable to a Google Network member if the payment is due in arrears) based on the number of search queries or advertisements displayed on the Google Network member’s web site or the actual revenue share amounts, whichever is greater. In addition, concurrent with the commencement of a small number of AdSense and other agreements, we have purchased certain items from, or provided other consideration to, our Google Network members and partners. We have determined that certain of these amounts are prepaid traffic acquisition costs and are amortized on a straight-line basis over the terms of the related agreements. Traffic acquisition costs were $461.8 million and $722.7 million in the three months ended March 31, 2005 and 2006.

In addition, cost of revenues includes the expenses associated with the operation of our data centers, including depreciation, labor, energy and bandwidth costs, as well as credit card and other transaction fees related to processing customer transactions.

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GOOGLE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Stock-based Compensation

In December 2004, the Financial Accounting Standards Board issued Statement of Financial Accounting Standards No. 123 (revised 2004), Share-Based Payment (SFAS 123R) that addresses the accounting for share-based payment transactions in which an enterprise receives employee services in exchange for equity instruments of the enterprise or liabilities that are based on the fair value of the enterprise’s equity instruments or that may be settled by the issuance of such equity instruments. SFAS 123R eliminates the ability to account for share-based compensation transactions using the intrinsic value method under Accounting Principles Board Opinion No. 25 (“APB 25”), Accounting for Stock Issued to Employees, and generally requires instead that such transactions be accounted for using a fair-value-based method. We adopted SFAS 123R beginning January 1, 2006.

SFAS 123R requires the use of a valuation model to calculate the fair value of stock-based awards. We have elected to use the Black-Scholes-Merton (“BSM”) option-pricing model to determine the fair value of stock-based awards on the dates of grant, consistent with that used for pro forma disclosures under SFAS No. 123, Accounting for Stock-Based Compensation. Restricted Stock Units (“RSUs”) are measured based on the fair market values of the underlying stock on the dates of grant. Shares are issued on the dates of vest net of the statutory withholding requirements to be paid by us on behalf of our employees. As a result, the actual number of shares issued will be less than the actual number of RSUs outstanding. Furthermore, in accordance with SFAS 123R, the liability for withholding amounts to be paid by us will be recorded as a reduction to additional paid-in capital when paid.

We have elected the modified prospective transition method as permitted by SFAS 123R and accordingly prior periods have not been restated to reflect the impact of SFAS 123R. Under this method, we are required to recognize stock-based compensation for all new and unvested stock-based awards that are ultimately expected to vest as the requisite service is rendered beginning January 1, 2006. Stock-based compensation is measured based on the fair values of all stock-based awards on the dates of grant.

We will recognize stock-based compensation using the straight-line method for all stock awards issued after January 1, 2006. For stock awards issued prior to January 1, 2006, we continue to recognize stock-based compensation using the accelerated method, other than RSUs issued to new employees that vest based on the employee’s performance for which we use the straight-line method in accordance with FASB Interpretation No. 28, Accounting for Stock Appreciation Rights and Other Variable Stock Option or Award Plans.

SFAS 123R requires that the deferred stock-based compensation on our balance sheet on the date of adoption be netted against additional paid-in capital. At December 31, 2005, we had $119.0 million of deferred stock-based compensation which was netted against additional paid-in capital on January 1, 2006, as reflected in the accompanying Condensed Consolidated Balance Sheet at March 31, 2006.

Also, in accordance with SFAS 123R, beginning in the first quarter of 2006 we have presented the benefits of tax deductions in excess of recognized compensation expense as a cash flow from financing activities in the accompanying Condensed Consolidated Statement of Cash Flows, rather than as a cash flow from operating activities, as was prescribed under accounting rules applicable through December 31, 2005. This requirement reduces and increases the amounts we record as net cash provided by operating activities and net cash provided by financing activities, respectively. Total cash flow remains unchanged from what would have been reported under prior accounting rules.

In March 2005, the Securities and Exchange Commission issued Staff Accounting Bulletin No. 107 (“SAB No. 107”). In accordance with this Bulletin, beginning in the first quarter of 2006, we no longer present stock- based compensation separately on our statements of income. Instead we present stock-based compensation in the

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GOOGLE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

same lines as c