Idaho Income Tax Withholding Payment and Filing Requirements
Employers in Idaho must conform with these state rules relating to filing income tax withholding returns.
Periodic Returns. Quarterly (Form 910) due by last day of month following end of quarter; monthly (Form 910) due by 20th day of the following month; split-monthly due on or before the 20th day of the month following the payment period (Form 910).
Annual Reconciliation Returns. Form 967 due before the last day of February.