From Apple's: EBOOK AGENCY/COMMISSIONAIRE DISTRIBUTION AGREEMENT, Section 5: Commission; Tax; and Reporting, paragraph (c)
"After deducting Apple’s commission, and any taxes collected by Apple under
Section 5(f) hereof, from eBook Proceeds, Apple shall either remit to Publisher,
or issue a credit in Publisher’s favor, subject to Apple’s standard business
practices, including minimum monthly remittance amount thresholds determined
by Apple (e.g., $150), the remaining balance by electronic funds transfer (“EFT”)
no later than forty-five (45) days following the close of the previous monthly
sales period. ..."