The GMC plans to abolish the exemption from the £390 annual retention fee (ARF) for doctors aged over 65.
The BMA has told GPs to hold off paying the fee. The GMC has been told not to impose the charge until the High Court decides on 1 October whether to hear the review.
Many GPs over the age of 65 wish to remain registered for occasional locum work, prescribing, or work on social security or medico-legal panels.
A BMA spokesman said: 'The BMA regrets that we have been forced to pursue this course of action, but we feel it is necessary to do so on behalf of the thousands of retired doctors who have given many years of service to the NHS.'
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