20 CFR § 345.111 - Contribution reports.
(1) Except as provided in paragraph (a)(2) of this section, every employer shall, for each calendar quarter of each year, prepare a contribution report, in duplicate, on Form DC-1. If the Form DC-1 is filed electronically, no duplicate submission is required.
(2) Contribution reports of employers who are required by State law to pay compensation on a weekly basis shall include with respect to such compensation all payroll weeks in which all or the major part of the compensation falls within the period for which the reports are required.
(b) Compensation to be reported on Form DC-1. Employers shall enter on the employer's quarterly contribution report, prior to any additions or subtractions, the amount of creditable compensation appearing on payrolls or other disbursement documents for the corresponding quarter as the amount of creditable compensation from which the contribution payable for that quarter is to be computed.