Google Inc. today announced financial results for the quarter ended March 31, 2013.

“We had a very strong start to 2013, with $14.0 billion in revenue, up 31% year-on-year,” said Larry Page, CEO of Google. “We are working hard and investing in our products that aim to improve billions of people's lives all around the world.”

Google Inc. reported consolidated revenues of $13.97 billion for the quarter ended March 31, 2013, an increase of 31% compared to the first quarter of 2012. Google Inc. reports advertising revenues, consistent with GAAP, on a gross basis without deducting traffic acquisition costs (TAC). In the first quarter of 2013, TAC totaled $2.96 billion, or 25% of advertising revenues.

Operating income, operating margin, net income, and earnings per share (EPS) are reported on a GAAP and non-GAAP basis. The non-GAAP measures, as well as free cash flow, an alternative non-GAAP measure of liquidity, are described below and are reconciled to the corresponding GAAP measures at the end of this release.

GAAP operating income in the first quarter of 2013 was $3.48 billion, or 25% of revenues. This compares to GAAP operating income of $3.39 billion, or 32% of revenues, in the first quarter of 2012. Non-GAAP operating income in the first quarter of 2013 was $4.22 billion, or 30% of revenues. This compares to non-GAAP operating income of $3.94 billion, or 37% of revenues, in the first quarter of 2012.

GAAP net income including net income from discontinued operations in the first quarter of 2013 was $3.35 billion, compared to $2.89 billion in the first quarter of 2012. Non-GAAP net income in the first quarter of 2013 was $3.90 billion, compared to $3.33 billion in the first quarter of 2012.

GAAP EPS including impact from net income from discontinued operations in the first quarter of 2013 was$9.94 on 337 million diluted shares outstanding, compared to $8.75 in the first quarter of 2012 on 330 million diluted shares outstanding. Non-GAAP EPS in the first quarter of 2013 was $11.58, compared to $10.08 in the first quarter of 2012.

Non-GAAP operating income and non-GAAP operating margin exclude stock-based compensation (SBC) expense, as well as restructuring and related charges recorded in our Motorola Mobile business. Non-GAAP net income and non-GAAP EPS exclude the expenses noted above, net of the related tax benefits, as well as net income from discontinued operations. In the first quarter of 2013, the expense related to SBC and the related tax benefits were $681 million and $149 million compared to $556 million and $118 million in the first quarter of 2012. In the first quarter of 2013, restructuring and related charges recorded in our Motorola Mobile business were $66 million, and the related tax benefits were $23 million. In addition, net income from discontinued operations, in the first quarter of 2013, was $22 million.