any locality-based comparability payment under section 5304 of title 5, United States Code, or similar provision of law) for the position in that category of positions without the authority of subsection (a) by more than 30 percent, and no rate may be established under this section in excess of the rate of basic pay payable for level IV of the Executive Schedule under section 5315 of title 5, United States Code. (c) Notification of removal from special rate of pay If the head of an element of the intelligence community removes a category of positions from coverage under a rate of pay authorized by subsection (a) after that rate of pay takes effect— (1) the head of such element shall provide notice of the loss of coverage of the special rate of pay to each individual in such category