Resident Withholding agents:
Payments are due at the same time as federal payments.
Nonresident Withholding agents:
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Payments are due quarterly if the total Withholding amount is less than $500/quarter, and remittance is due by the last day of the month following the end of the quarter.
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Payments are due monthly if Withholding amount is $500 or more/quarter, and the remittance is due by the 15th of the following month.