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Percentage of teachers with income from supplemental sources and average amount earned by main teaching assignment: 2017–18

  Percent of
teachers earning
any income from
sources other
than base
teaching salary
  Average earned
from all
supplemental
sources
combined
  Extracurricular or additional activities
in same school system
  Additional compensation based on
students' performance
  Other school system sources   Job outside the school system  
Teaching main assignment   Percent of
teachers
  Average amount   Percent of
teachers
  Average amount   Percent of
teachers
  Average amount   Percent of
teachers
  Average amount  
All public schools 58.3   $4,400   42.8   $2,800   8.2   $1,400   7.8   $3,200   17.8   $5,800  
                                         
Teacher main assignment                                        
Early childhood or general elementary 47.3   3,000   31.5   1,700   9.0   1,400   6.9   3,000   12.4   4,700  
Special education 50.9   4,100   35.0   2,500   6.0   1,400   6.6   3,100   17.8   5,400  
Arts or music 73.9   5,500   59.8   3,300   7.2   1,400   6.0   4,000   30.6   5,800  
English and language arts 59.9   3,800   45.2   2,300   9.7   1,300   8.1   3,000   16.1   5,100  
ESL/bilingual education 51.5   3,600   32.3   1,900   7.5   1,200   9.9   2,800   14.3   6,000  
Foreign languages 57.2   4,700   38.9   3,100   7.0   1,600   7.5   2,700   20.0   5,600  
Health education 77.5   6,800   64.0   5,100   7.5   1,400   7.1   3,000   24.3   7,000  
Mathematics 67.0   5,100   51.5   3,100   8.2   1,400   10.7   3,300   20.0   6,800  
Natural sciences 66.2   4,600   51.0   2,900   8.3   1,400   9.2   3,200   20.6   5,400  
Social sciences 70.2   5,300   56.0   3,700   8.2   1,700   8.5   3,700   21.3   5,600  
Career or technical education 72.5   6,500   55.0   3,600   7.1   1,300   10.1   3,100   26.0   9,200  
All other 68.6   6,500   53.4   3,900   7.4   1,500   11.1   3,900   20.7   8,700  
SOURCE: U.S. Department of Education, National Center for Education Statistics, National Teacher and Principal Survey (NTPS), "Public School Teacher Data File," 2017–18.