Del. Code Ann. tit. 30, § 2004F
Loan-out withholding
A production company or its authorized payroll service company shall withhold Delaware income tax at the rate of 6.6% on all payments to loan-out companies for services performed in Delaware by the loan-out company’s employees and shall deposit such amounts with this State. The amounts so withheld shall be deemed to have been withheld by the loan-out company on wages paid to its employees for services performed in Delaware and shall be allocated to the loan-out company’s employees in proportion to the payments made by the loan-out company to its employees for services performed in Delaware. The production company or the authorized payroll service company which withheld payment under this section shall provide and remit such information, records, documentation, and reports as the Director of Revenue may require to identify the entity or individuals associated with such withholdings. For purposes of this chapter and notwithstanding any other provision in this chapter to the contrary, loan-out company nonresident employees performing services in Delaware shall be considered taxable nonresidents and shall be subject to income taxation in the taxable year in which the loan-out company’s employees perform services in Delaware.