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Income Taxes (Tables) | 9 Months Ended
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Sep. 29, 2019
Reconciliation of Effective Tax Rate | A reconciliation of the United States federal statutory corporate tax rate to Teradyne’s effective tax rate was as follows:
|  | For the Three Months Ended |  |  | For the Nine Months Ended |
|  | September 29, 2019 |  |  | September 30, 2018 |  |  | September 29, 2019 |  |  | September 30, 2018 |
US statutory federal tax rate |  |  | 21.0 | % |  |  | 21.0 | % |  |  | 21.0 | % |  |  | 21.0 | %
Discrete expense related to U.S. transition tax |  |  | — |  |  |  | — |  |  |  | 3.9 |  |  |  | 0.0 |
Foreign taxes |  |  | (5.1 | ) |  |  | (4.4 | ) |  |  | (4.9 | ) |  |  | (3.7 | )
International provisions of the U.S. Tax Cuts and Jobs Act of 2017 |  |  | (2.8 | ) |  |  | (1.4 | ) |  |  | (0.6 | ) |  |  | (1.4 | )
Tax credits |  |  | (1.8 | ) |  |  | (1.9 | ) |  |  | (2.2 | ) |  |  | (2.1 | )
Discrete benefit related to equity compensation |  |  | (0.7 | ) |  |  | (0.1 | ) |  |  | (1.5 | ) |  |  | (2.2 | )
Discrete benefit related to release of reserves for uncertain tax positions |  |  | — |  |  |  | (0.1 | ) |  |  | (6.9 | ) |  |  | — |
Other, net |  |  | (0.1 | ) |  |  | 1.7 |  |  |  | 0.4 |  |  |  | 2.0 |
Effective tax rate |  |  | 10.5 | % |  |  | 14.8 | % |  |  | 9.2 | % |  |  | 13.6 | %

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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Namespace Prefix: | us-gaap_
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