Rebeca Grynspan may be leading the race to become the next United Nations Secretary-General, but victory remains far from certain. The former Costa Rican vice president has emerged ahead of six other candidates in the Security Council’s informal straw polls, although her support has fluctuated (Reuters, 2026a). With António Guterres set to leave office at the end of December, the search for his successor is unfolding against a backdrop of financial difficulties, geopolitical divisions and growing questions about the UN’s effectiveness.
The challenge awaiting the next Secretary-General extends well beyond securing enough votes. The United States, historically the organisation’s largest financial contributor, has reduced funding and demanded institutional reforms, while disagreements among major powers continue to limit the UN’s ability to respond to international crises (Reuters, 2026b).
Whoever succeeds Guterres will therefore inherit more than an administrative position. Their ability to restore confidence in multilateral diplomacy will depend partly on the political support and resources that member states are prepared to provide. The succession race offers an early indication of whether those governments can agree on the kind of United Nations they want to sustain.
The selection process gives the major powers considerable influence over the appointment. Under Article 97 of the UN Charter, the General Assembly appoints the Secretary-General following a recommendation from the Security Council. In practice, a candidate needs at least nine votes from the Council’s fifteen members without facing a veto from any of its five permanent members: China, France, Russia, the United Kingdom and the United States.
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This makes the informal straw polls an imperfect measure of a candidate’s chances. In the fifth round, Grynspan received nine encouraging votes and six discouraging votes, illustrating how a candidate can attract substantial support while still facing significant opposition. The next round will distinguish ballots cast by permanent members from those of elected members, providing a clearer indication of potential vetoes (Security Council Report, 2026). The process creates a difficult balancing act. A candidate must secure enough international support to appear credible while remaining acceptable to governments with sharply different expectations of the UN. That compromise may determine not only who takes office, but also how much political freedom the next Secretary-General has once appointed. The next Secretary-General will inherit an organisation struggling to finance its existing responsibilities. According to the UN80 Initiative, arrears in assessed contributions to the UN’s regular and peacekeeping budgets rose from $3.4 billion in 2022 to $6.6 billion by April 2026 (United Nations, 2026).
Funding pressures have already forced staffing reductions and operational cutbacks, leaving the organisation with fewer resources to fulfil the mandates assigned by its members. Washington’s relationship with the UN illustrates the problem. The Trump administration has reduced funding and withheld contributions while criticising the organisation for excessive bureaucracy and inefficiency. Yet American disengagement has been selective. In September, the United States paid $725 million towards the UN’s regular budget, followed by new funding pledges to several Geneva-based agencies in October.
The State Department described these payments as recognition of reforms already achieved, while demanding further changes (Reuters, 2026b; Reuters, 2026c).
These financial pressures will follow Guterres’s successor into office. The UN remains dependent on contributions from governments that may disagree with its priorities or demand reforms in return for continued support. The next Secretary-General will therefore face pressure to reduce costs while preserving the organisation’s diplomatic, humanitarian and peacekeeping capabilities. Financial stability will depend as much on political cooperation among member states as on administrative reform. Grynspan has argued that the UN has become too cautious in its approach to international crises, calling for stronger mediation efforts and greater willingness to pursue diplomatic initiatives even when success is uncertain.
She has also proposed reducing bureaucratic duplication and consolidating overlapping responsibilities, arguing that budget cuts alone cannot restore the organisation’s effectiveness (Reuters, 2026a). These ambitions run into the limits of the office itself. The Secretary-General can initiate diplomatic efforts, coordinate UN agencies and advocate for reform, but major decisions remain dependent on member states. The Security Council’s permanent members retain considerable influence over international peace and security, while governments ultimately determine the resources available to implement UN mandates (Council on Foreign Relations, 2026).
Administrative reforms may improve efficiency, but restoring the UN’s diplomatic relevance requires cooperation from governments that frequently disagree on international crises. A Secretary-General who challenges those divisions too aggressively risks losing political support; one who avoids confrontation may struggle to demonstrate meaningful leadership. The strength of the next mandate will therefore depend on whether member states are willing to support the reforms and diplomatic initiatives they expect the organisation to deliver.
The appointment of Guterres’s successor will settle the leadership question, but little else. Financial uncertainty, geopolitical divisions, and competing demands for reform will remain long after the Security Council reaches a decision.
The next Secretary-General will need to balance institutional reform with the diplomatic responsibilities that give the UN its relevance. Success will require more than administrative efficiency or ambitious promises. Ultimately, the succession will test more than the candidates’ ability to secure votes. It will reveal whether member states are prepared to provide the political backing, resources and freedom of action needed for their next Secretary-General to exercise a meaningful mandate.
