Q: Given a passage and a question, find the answer to the question based on the passage. The answer should consist of only one word that lies in the span of only one of the sentences in the passage.
Paragraph: The working income tax benefit ( WITB ) is a refundable tax credit in Canada , similar to the Earned Income Tax Credit ( EITC ) in the United States . Introduced in 2007 , it offers tax relief to working low - income individuals and encourages others to enter the workforce . The WITB has been expanded considerably since its introduction .
Question: when did the working income tax benefit come into effect

A:
2007