Income Taxes	3 Months Ended
Mar. 31, 2013
Income Taxes	J. Income Taxes – The effective tax rate for the first quarter of 2013 and 2012 was 27.4% and 28.3%, respectively. The rate for the 2013 first quarter differs from the U.S. federal statutory rate of 35% primarily due to a $19 discrete income tax benefit related to new U.S. tax legislation. On January 2, 2013, the American Taxpayer Relief Act of 2012 was signed into law and reinstated various expired or expiring temporary business tax provisions through 2013. Two specific temporary business tax provisions that expired in 2011 and impacted Alcoa are the look-through rule for payments between related controlled foreign corporations and the research and experimentation credit. The expiration of these two provisions resulted in Alcoa recognizing a higher income tax provision of $19 in 2012. As tax law changes are accounted for in the period of enactment, Alcoa recognized the previously mentioned discrete income tax benefit in the 2013 first quarter related to the 2012 tax year to reflect the extension of these provisions. The rate for the 2012 first quarter differs from the U.S. federal statutory rate of 35% primarily due to foreign income taxed in lower rate jurisdictions.

Income Taxes

3 Months Ended

Mar. 31, 2013

J. Income Taxes – The effective tax rate for the first quarter of 2013 and 2012 was 27.4% and 28.3%, respectively.

The rate for the 2013 first quarter differs from the U.S. federal statutory rate of 35% primarily due to a $19 discrete income tax benefit related to new U.S. tax legislation.

On January 2, 2013, the American Taxpayer Relief Act of 2012 was signed into law and reinstated various expired or expiring temporary business tax provisions through 2013. Two specific temporary business tax provisions that expired in 2011 and impacted Alcoa are the look-through rule for payments between related controlled foreign corporations and the research and experimentation credit. The expiration of these two provisions resulted in Alcoa recognizing a higher income tax provision of $19 in 2012. As tax law changes are accounted for in the period of enactment, Alcoa recognized the previously mentioned discrete income tax benefit in the 2013 first quarter related to the 2012 tax year to reflect the extension of these provisions.

The rate for the 2012 first quarter differs from the U.S. federal statutory rate of 35% primarily due to foreign income taxed in lower rate jurisdictions.