Services that a duly ordained, commissioned or licensed minister performs in the exercise of his or her ministry are covered under the Self-Employment Contributions Act (SECA). That means they are exempt from Social Security and Medicare withholding, but they are responsible for paying self-employment tax on their net earnings from self-employment.

There are some members of religious orders, ministers, and Christian Science practitioners who have requested and been granted exemption from self-employment tax. There are also members of religious orders who have taken a vow of poverty and ministers who are covered solely by the social security laws of another country under a social security agreement between the United States and that other country.

References:

• Publication 517, Social Security and Other Information for the Members of the Clergy and Religious Workers
• Form 4361 (PDF), Application for Exemption from Self-Employment Tax for Use by Ministers, Members of Religious Orders, and Christian Science Practitioners
• Tax Topic 417, Earnings for clergy

Source: www.irs.gov