Colorado requires employers to withhold state income tax from each paycheck based on the employee’s earnings and the withholding allowances claimed on Form DR 0004. The state also mandates unemployment insurance (SUTA) contributions, which are calculated on a quarterly wage base and vary by employer experience rating.
Beyond state income tax, certain municipalities impose local payroll taxes, and employers must stay current with quarterly filing deadlines. Understanding each component helps avoid under‑withholding, which can trigger penalties, and over‑withholding, which reduces take‑home pay and may require refunds.