Average percentage of teachers with income from non-salary sources in a job outside of the school system during the school year and proportion by description of the outside job by main teaching assignment: 2017–18

	Job outside the school system		Description of outside job
Teaching main assignment			Teaching or tutoring		Non-teaching, but related to teaching field		Other
All public schools	17.8		24.5		20.1		55.4
Teacher main assignment
Early childhood or general elementary	12.4		25.1		15.7		59.2
Special education	17.8		22.3		18.5		59.1
Arts or music	30.6		27.9		26.5		45.6
English/language arts	16.1		28.9		21.4		49.7
ESL/bilingual education	14.3		29.9		22.3		47.8
Foreign languages	20.0		25.6		18.7		55.7
Health education	24.3		11.8		22.5		65.8
Mathematics	20.0		34.6		15.8		49.6
Natural sciences	20.6		24.3		23.1		52.6
Social sciences	21.3		17.9		24.8		57.3
Career or technical education	26.0		19.4		22.3		58.3
Other	20.7		16.2		21.3		62.5
SOURCE: U.S. Department of Education, National Center for Education Statistics, National Teacher and Principal Survey (NTPS), "Public School Teacher Data File," 2017–18.

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