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Income Taxes (Tables)
 9 Months Ended
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
 %