The Working Income Tax Benefit is a refundable tax credit that can be claimed by eligible low-income individuals and families beginning with their 2007 income tax returns. A disability supplement to the WITB is also available for individuals (other than a dependant) who qualify for the Disability Tax Credit, meet the eligibility criteria for the WITB, and have earned income over a certain level. For more information on the Working Income Tax Benefit, contact the Canada Revenue Agency at 1.800.959.8281 (TTY users contact 1.800.665.0354) or visit cra.gc.ca.