Income Taxes	3 Months Ended
Apr. 01, 2018
Income Taxes	R. INCOME TAXES The effective tax rate for the three months ended April 1, 2018 and April 2, 2017 was 9.2% and 7.4%, respectively. The increase in the effective tax rate from the three months ended April 2, 2017 to the three months ended April 1, 2018 primarily resulted from a projected shift in the geographic distribution of income which increased income subject to taxation in the U.S. relative to lower tax rate jurisdictions and a reduction in discrete tax benefits recognized. These increases were partially offset by the benefit of the reduction in the U.S. corporate tax rate from 35% to 21% and the U.S. foreign derived intangible income deduction. The effective tax rates for the three months ended April 1, 2018 and April 2, 2017 differed from the expected federal statutory rate primarily because of the favorable effect of statutory rates applicable to income earned outside the United States. The tax rate for the three months ended April 1, 2018 and April 2, 2017 was also reduced by the benefit from U.S. research and development tax credits, partially offset by additions to the uncertain tax positions for transfer pricing, both of which are included in the projected annual effective tax rate. Discrete tax benefits recorded in the three months ended April 1, 2018 amounted to $8.3 million composed of $7.6 million from stock based compensation and $0.7 million of other discrete tax benefits. Discrete tax expense amounted to $2.3 million composed of $1.7 million from the remeasurement of deferred tax assets as a result of reductions in tax rates and $0.6 million of other discrete tax expenses. The $7.6 million of discrete benefit from stock based compensation included $7.4 million of excess tax benefits recognized pursuant to ASU No. 2016-09 “Improvements to Employee Share-Based Payment Accounting.” Discrete tax benefits recorded in the three months ended April 2, 2017 amounted to $7.0 million of which $5.5 million resulted from stock based compensation, $0.7 million related to U.S. research and development tax credits and $0.8 million from other discrete tax benefits. The $5.5 million of discrete benefit from stock based compensation included $5.2 million of excess tax benefits recognized pursuant to ASU No. 2016-09 “Improvements to Employee Share-Based Payment Accounting.” On a quarterly basis, Teradyne evaluates the realizability of the deferred tax assets by jurisdiction and assesses the need for a valuation allowance. As of April 1, 2018, Teradyne believes that it will ultimately realize the deferred tax assets recorded on the condensed consolidated balance sheet. However, should Teradyne believe that it is more-likely-than-not that the deferred tax assets would not be realized, the tax provision would increase in the period in which Teradyne determined that the realizability was not likely. Teradyne considers the probability of future taxable income and historical profitability, among other factors, in assessing the realizability of the deferred tax assets. As of April 1, 2018 and December 31, 2017, Teradyne had $37.3 million and $36.3 million, respectively, of reserves for uncertain tax positions. The $1.0 million net increase in reserves for uncertain tax positions is primarily composed of additions related to transfer pricing exposures and U.S. research and development tax credits. Teradyne is currently under examination by the Internal Revenue Service. The timing of resolution and closure of the tax audit is highly unpredictable. Given the uncertainty, it is reasonably possible that the balance of unrecognized tax benefits could significantly change within the next twelve months. However, an estimate of the range of reasonably possible adjustments cannot presently be made. Teradyne recognizes interest and penalties related to income tax matters in income tax expense. As of April 1, 2018 and December 31, 2017, $0.3 million and $0.3 million, respectively, of interest and penalties were accrued for uncertain tax positions. For the three months ended April 1, 2018, an expense of $0.03 million was recorded for interest and penalties related to income tax items. For the three months ended April 2, 2017, a benefit of $0.1 million was recorded for interest and penalties related to income tax items. Teradyne qualifies for a tax holiday in Singapore by fulfilling the requirements of an agreement with the Singapore Economic Development Board under which certain headcount and spending requirements must be met. The tax savings due to the tax holiday for the three months ended April 1, 2018 was $3.0 million, or $0.01 per diluted share. The tax savings due to the tax holiday for the three months ended April 2, 2017 was $4.7 million, or $0.02 per diluted share. The tax holiday is scheduled to expire on December 31, 2020. In the fourth quarter of 2017, Teradyne recorded a provisional amount of $186.0 million of additional income tax expense which represents Teradyne’s best estimate of the impact of the Tax Cuts and Jobs Act of 2017 (the “Tax Reform Act”) in accordance with Teradyne’s understanding of the Tax Reform Act and guidance available at that time. The $186.0 million is composed of expense of $161.0 million related to the one-time transition tax on the mandatory deemed repatriation of foreign earnings, $33.6 million of expense related to the remeasurement of certain deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, a benefit of $10.3 million associated with the impact of correlative adjustments on uncertain tax positions, and $1.7 million of expense related to the remeasurement of certain uncertain tax positions resulting from the reduction in the federal tax rate. Although the provisional estimates are based on the best available interpretations of the Tax Reform Act, the final impacts may differ from the estimates due to, among other things, the issuance of additional regulatory and legislative guidance related to the Tax Reform Act. As of April 1, 2018, there has been no material change to the provisional amount recorded. Any adjustment to the provisional amounts will be recorded in 2018 when the analysis is complete.

R. INCOME TAXES

The effective tax rate for the three months ended April 1, 2018 and April 2, 2017 was 9.2% and 7.4%, respectively.

The increase in the effective tax rate from the three months ended April 2, 2017 to the three months ended April 1, 2018 primarily resulted from a projected shift in the geographic distribution of income which increased income subject to taxation in the U.S. relative to lower tax rate jurisdictions and a reduction in discrete tax benefits recognized. These increases were partially offset by the benefit of the reduction in the U.S. corporate tax rate from 35% to 21% and the U.S. foreign derived intangible income deduction.

The effective tax rates for the three months ended April 1, 2018 and April 2, 2017 differed from the expected federal statutory rate primarily because of the favorable effect of statutory rates applicable to income earned outside the United States.

The tax rate for the three months ended April 1, 2018 and April 2, 2017 was also reduced by the benefit from U.S. research and development tax credits, partially offset by additions to the uncertain tax positions for transfer pricing, both of which are included in the projected annual effective tax rate.

Discrete tax benefits recorded in the three months ended April 1, 2018 amounted to $8.3 million composed of $7.6 million from stock based compensation and $0.7 million of other discrete tax benefits. Discrete tax expense amounted to $2.3 million composed of $1.7 million from the remeasurement of deferred tax assets as a result of reductions in tax rates and $0.6 million of other discrete tax expenses. The $7.6 million of discrete benefit from stock based compensation included $7.4 million of excess tax benefits recognized pursuant to ASU No. 2016-09 “Improvements to Employee Share-Based Payment Accounting.”

Discrete tax benefits recorded in the three months ended April 2, 2017 amounted to $7.0 million of which $5.5 million resulted from stock based compensation, $0.7 million related to U.S. research and development tax credits and $0.8 million from other discrete tax benefits. The $5.5 million of discrete benefit from stock based compensation included $5.2 million of excess tax benefits recognized pursuant to ASU No. 2016-09 “Improvements to Employee Share-Based Payment Accounting.”

On a quarterly basis, Teradyne evaluates the realizability of the deferred tax assets by jurisdiction and assesses the need for a valuation allowance. As of April 1, 2018, Teradyne believes that it will ultimately realize the deferred tax assets recorded on the condensed consolidated balance sheet. However, should Teradyne believe that it is more-likely-than-not that the deferred tax assets would not be realized, the tax provision would increase in the period in which Teradyne determined that the realizability was not likely. Teradyne considers the probability of future taxable income and historical profitability, among other factors, in assessing the realizability of the deferred tax assets.

As of April 1, 2018 and December 31, 2017, Teradyne had $37.3 million and $36.3 million, respectively, of reserves for uncertain tax positions. The $1.0 million net increase in reserves for uncertain tax positions is primarily composed of additions related to transfer pricing exposures and U.S. research and development tax credits.

Teradyne is currently under examination by the Internal Revenue Service. The timing of resolution and closure of the tax audit is highly unpredictable. Given the uncertainty, it is reasonably possible that the balance of unrecognized tax benefits could significantly change within the next twelve months. However, an estimate of the range of reasonably possible adjustments cannot presently be made.

Teradyne recognizes interest and penalties related to income tax matters in income tax expense. As of April 1, 2018 and December 31, 2017, $0.3 million and $0.3 million, respectively, of interest and penalties were accrued for uncertain tax positions. For the three months ended April 1, 2018, an expense of $0.03 million was recorded for interest and penalties related to income tax items. For the three months ended April 2, 2017, a benefit of $0.1 million was recorded for interest and penalties related to income tax items.

Teradyne qualifies for a tax holiday in Singapore by fulfilling the requirements of an agreement with the Singapore Economic Development Board under which certain headcount and spending requirements must be met. The tax savings due to the tax holiday for the three months ended April 1, 2018 was $3.0 million, or $0.01 per diluted share. The tax savings due to the tax holiday for the three months ended April 2, 2017 was $4.7 million, or $0.02 per diluted share. The tax holiday is scheduled to expire on December 31, 2020.

In the fourth quarter of 2017, Teradyne recorded a provisional amount of $186.0 million of additional income tax expense which represents Teradyne’s best estimate of the impact of the Tax Cuts and Jobs Act of 2017 (the “Tax Reform Act”) in accordance with Teradyne’s understanding of the Tax Reform Act and guidance available at that time. The $186.0 million is composed of expense of $161.0 million related to the one-time transition tax on the mandatory deemed repatriation of foreign earnings, $33.6 million of expense related to the remeasurement of certain deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, a benefit of $10.3 million associated with the impact of correlative adjustments on uncertain tax positions, and $1.7 million of expense related to the remeasurement of certain uncertain tax positions resulting from the reduction in the federal tax rate. Although the provisional estimates are based on the best available interpretations of the Tax Reform Act, the final impacts may differ from the estimates due to, among other things, the issuance of additional regulatory and legislative guidance related to the Tax Reform Act. As of April 1, 2018, there has been no material change to the provisional amount recorded. Any adjustment to the provisional amounts will be recorded in 2018 when the analysis is complete.