term:

Checkoff

checkoff n

1 : the deduction of union dues from a worker's paycheck by the employer
2 : designation on an income tax return of a small amount of money to be applied to a special fund (as for campaign financing)

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.