Summary: GAO reviewed the effects of proposed legislation--H.R. 1833--on the pay of officers at the U.S. Customs Service. The proposal would amend the 1911 Act governing Customs officers' overtime and premium pay, and it would more closely align Customs differential pay with that of other federal agencies. Should the provision be enacted, Customs officers would be limited to the amount and times for which they would be eligible for night differential pay. In addition, another section of the proposed law would remove premium pay from the calculation of the $30,000 fiscal year overtime and premium pay cap that Customs officers may not exceed. GAO's analysis of Customs data showed that had the provisions of H.R. 1833 been in effect during fiscal year 1999, many officers would have experienced significant pay decreases. Managers and supervisors asked to analyze the proposal had mixed reviews, but those not in favor of the proposal were concerned that less eligibility for night differential pay would lead to low morale and staffing problems.