Final answer:
The leading source of federal government revenue is individual income taxes, making option B the correct answer.
Step-by-step explanation:
The leading source of revenue for the federal government is individual income taxes.
Individual income tax is the largest single source of federal government revenue, representing less than half of federal tax revenue. The personal income tax is due every year on April 15th. While corporate income taxes, known as "profits," have historically been an important revenue source, they have declined as a share of GDP over time, making them the third-largest source of federal tax revenue. Corporate income tax receipts have decreased from about 4% of GDP in the 1960s to an average of 1% to 2% of GDP in the past decades.
In conclusion, the correct answer to which tax is the leading source of revenue for the federal government is B. Individual income taxes.