Income Taxes	6 Months Ended
Jun. 30, 2013
Income Taxes	O. Income Taxes The effective tax rate for the three months ended June 30, 2013 and July 1, 2012 was 17% and 27%, respectively. The decrease in Teradyne’s tax rate for the three months ended June 30, 2013 compared to the three months ended July 1, 2012, was primarily the result of the 2013 U.S. federal research and development tax credit and utilization of foreign tax credits. The effective tax rate for the six months ended June 30, 2013 and July 1, 2012 was 7% and 25%, retrospectively. The decrease in Teradyne’s tax rate for the six months ended June 30, 2013 compared to the six months ended July 1, 2012, was primarily the result of recognizing the tax benefit attributable to the 2012 U.S. federal research and development tax credit retrospectively reinstated under the American Taxpayer Relief Act of 2012, 2013 U.S. federal research and development tax credit and utilization of foreign tax credits. The effective tax rate for the three months and six months ended June 30, 2013 is lower than the 35% U.S. statutory federal tax rate primarily due to the research and development credit and the effect of foreign income taxed at a rate lower than the U.S. statutory rate

Income Taxes

6 Months Ended

Jun. 30, 2013

O. Income Taxes

The effective tax rate for the three months ended June 30, 2013 and July 1, 2012 was 17% and 27%, respectively. The decrease in Teradyne’s tax rate for the three months ended June 30, 2013 compared to the three months ended July 1, 2012, was primarily the result of the 2013 U.S. federal research and development tax credit and utilization of foreign tax credits.

The effective tax rate for the six months ended June 30, 2013 and July 1, 2012 was 7% and 25%, retrospectively. The decrease in Teradyne’s tax rate for the six months ended June 30, 2013 compared to the six months ended July 1, 2012, was primarily the result of recognizing the tax benefit attributable to the 2012 U.S. federal research and development tax credit retrospectively reinstated under the American Taxpayer Relief Act of 2012, 2013 U.S. federal research and development tax credit and utilization of foreign tax credits.

The effective tax rate for the three months and six months ended June 30, 2013 is lower than the 35% U.S. statutory federal tax rate primarily due to the research and development credit and the effect of foreign income taxed at a rate lower than the U.S. statutory rate