A/RES/74/255 A–B United Nations common system II Conditions of service of staff in the Professional and higher categories A Base/floor salary scale Recalling its resolution 44/198, by which it established a floor net salary level for staff in the Professional and higher categories by reference to the corresponding base net salary levels of officials in comparable po sitions serving at the base city of the comparator civil service (the United States federal civil service), Approves, with effect from 1 January 2020, as recommended by the Commission in paragraph 63 of its report, the revised unified base/floor salary s cale and updated pay protection points for staff in the Professional and higher categories, as contained in annex IV to the report; B Evolution of the margin and margin management around the desirable midpoint Recalling section I.B of its resolution 51/216 and the standing mandate from the General Assembly, in which the Commission is requested to continue its review of the relationship between the net remuneration of the United Nations staff in the Professional and higher categories in New York and that of the comparator civil service (the United States federal civil service) employees in comparable positions in Washington, D.C. (referred to as “the margin”), 1. Reaffirms that the range of 110 to 120 for the margin between the net remuneration of officials in the Professional and higher categories of the United Nations in New York and officials in comparable positions in the comparator civil service should continue to apply, on the understanding that the margin would be maintained at a level around the desirable midpoint of 115 over a period of time; 2. Notes that the margin between net remuneration of the United Nations staff in grades P-1 to D-2 in New York and that of officials in comparable positions in the United States federal civil service in Washington, D.C., for the period from 1 January to 31 December 2019 is 113.4; 3. Recalls its decision contained in resolution 70/244 that, if the margin trigger levels of 113 or 117 are breached, the Commission should take appropriate action through the operation of the post adjustment system; 4. Notes the decision of the Commission to continue monitoring the level of the margin and to take the necessary corrective action under the operation of the post adjustment system should the trigger levels of 113 or 117 be breached; C Education grant Decides to defer consideration of the recommendations of the Commission on the revised sliding reimbursement scale and the boarding lump sum, and requests the Commission to provide in its next report a detailed review on the scale and the level of the boarding lump sum, taking into consideration a maximum amount per household; 4/5 20-00330