The UN Special Post Allowance (SPA): getting paid to act at a higher level

Staff members are regularly asked to cover a higher-level post temporarily — a supervisor departs, a post is vacant during recruitment, or a project needs someone to act up while a permanent selection is made. When that happens, the person doing the higher job usually keeps their existing grade and salary unless a specific allowance kicks in. That allowance is the Special Post Allowance (SPA). This guide explains what it actually pays, when it applies, and why it is not automatic just because someone is doing a bigger job than their contract says.

What SPA actually is

SPA compensates a staff member for temporarily performing the full duties and responsibilities of a post classified at a higher grade than their own, for a defined period. It does not change the staff member’s actual grade, step or underlying contract — the person remains, on paper, at their substantive level, and the allowance is paid on top of their normal salary and entitlements for as long as the higher-level assignment lasts. When the assignment ends, so does the allowance; it is not folded into base pay.

When SPA applies — and when it doesn’t

SPA is not triggered automatically by doing extra work or by occasionally covering for an absent supervisor. It is meant for a specific situation: a staff member assigned, through a proper administrative decision, to carry out the full range of duties of a higher-level post — not just some of them — normally for an assignment expected to last beyond a minimum threshold set in the organization’s own administrative instruction (commonly a period of several months). Short, informal cover for a colleague on leave, or partial coverage of a higher post’s duties shared among several staff, typically does not qualify on its own.

Because the exact threshold, ceiling and approval chain are set in each organization’s own policy, treat the pattern above as the general logic to expect rather than a fixed rule to invoke without checking the current administrative instruction.

How the allowance is calculated

SPA is generally calculated as the difference between the staff member’s current salary and what they would earn at the relevant step of the higher grade — in effect, paying the gap rather than the whole higher-grade salary on top of the existing one. It is paid for the duration of the higher-level assignment as formally approved, and most organizations cap how long SPA can run before the situation has to be resolved another way — either by classifying and filling the post permanently at its actual level, or by ending the temporary assignment.

It requires a formal decision — not an informal understanding

Because SPA changes what a staff member is paid, it is not something a supervisor can grant verbally by asking someone to “cover the desk.” It requires a specific administrative action: confirmation that the higher-level post exists, is vacant or otherwise unencumbered, that the assignment covers its full duties, and that the arrangement is processed through the same human resources channel that handles any other change to a staff member’s pay. A staff member who is asked to act up should confirm this paperwork is actually moving — doing a higher-level job for months with only a verbal promise of retroactive SPA is a common and avoidable source of pay disputes.

SPA is not a promotion

SPA is easy to confuse with an actual promotion because both involve doing a higher-level job, but they resolve differently:

• Promotion permanently reclassifies a staff member’s own post, or moves them into a different post, at a higher grade — see the promotion and career progression guide. It normally runs through a competitive selection or reclassification process and is not reversed when a particular assignment ends.
• SPA is temporary and tied to a specific assignment. It stops when the assignment stops, and it does not by itself change a staff member’s grade, step, or standing to compete for the higher-level post on a permanent basis — though acting in a post is often genuine, relevant experience when that post is eventually advertised.

SPA vs. hardship, danger pay and other allowances

SPA sits in a different category from location-based entitlements. Hardship and mobility allowances and danger pay are tied to where a staff member is serving, regardless of their specific duties. SPA is tied to what a staff member is doing, regardless of where they are serving — a staff member could in principle receive both at once, since the two questions (location and duties) are assessed independently.

Where to check the current rules

Thresholds, ceilings and the approval process for SPA are set in each organization’s own administrative instruction and are revised periodically, so a staff member being asked to act up in a higher-level post should confirm the current rule with their human resources office rather than relying on how a previous acting assignment in the same office was handled.

SPA is one mechanical piece of the broader compensation picture covered in the ICSC salary scale guide and the complete field guide. Current vacancies across every international organization are always live on the board, and a free changemaker profile keeps your applications organised while you build a case for the post you’re already doing the work of.