Social Security - Ministers Form 4361

The Form first used to claim exemption from social security is filed on IRS Form 4361. The exemption once granted is irrevocable unless requested within a 27 and a half initial period.
Exempted Ordained Ministers, Priests, or Rabbi's may revoke the original election and re-elect social security coverage by filing out IRS Form 2031.
Once you revoke the exemption you can never elect exemption from social security coverage again.