Effective August 5, 2008, Coloradoâ€™s SB 114 amended its law to require employee leasing companies to provide evidence of security of its unemployment tax withholding. This may be done with a surety bond, cash, or a letter of credit. The amount of the surety bond should equal half of the average annual amount of tax that was levied the previous year. For new companies, the companyâ€™s own estimate of 50% of the estimated projected taxable payroll for the current year multiplied by the standard tax rate will calculate the amount of the bond. If the company does not wish to provide a bond, cash, or a letter of credit, they may instead provide independently audited CPA prepared financial statements or evidence that a bonded and independent qualified assurance organization has accredited the company.