# Iran did not end Uranium enrichment in 2026

*World. 86% certain. Friday, 1 January 2027*

> Speculative fiction assembled from prediction-market prices. This has not happened.

**Iran failed to end Uranium enrichment and did not withdraw from the nuclear Non-Proliferation Treaty in 2026.**

Iran made no substantive change to its nuclear programme in 2026. The year closed without Tehran ending Uranium enrichment or delivering any new commitments to the international community. The expected milestones on weapons development, stockpile reduction and treaty status all remained unmet.

The deadline of December 31, 2026 for halting enrichment passed without action. Iranian facilities continued operating at previous levels throughout the year.

Similarly, Tehran did not surrender its enriched Uranium stockpile by the end-of-year deadline. The material remained under the control of Iran's nuclear agencies. No transfer to the IAEA or other parties was reported.

Negotiations with the United States did not produce a Uranium enrichment Cap of five per cent or less. The proposed one-year limit in a deal was never incorporated. Iran also retained its membership in the nuclear Non-Proliferation Treaty, with no withdrawal before 2027.

Assessments for 2026 confirmed that Iran did not acquire a nuclear weapon before 2027. The country's nuclear activities stayed within the parameters of its existing programme. No breakthrough or new capability was documented during the year.

## Analysis

The absence of any step to halt enrichment means Tehran continues to possess the technical capacity to increase Uranium purity, a prerequisite for weapons-grade material. Without a formal Cap, the enrichment level remains unrestricted, preserving the option to accelerate the process if political calculations shift.

The failure to surrender the existing stockpile leaves a substantive quantity of enriched Uranium under Iranian control, complicating verification and limiting the International Atomic Energy Agency's ability to monitor compliance. This stockpile can serve as a foundation for future scale-up, reinforcing concerns among states that view Iran's nuclear ambitions as a security risk.

Retaining full membership in the nuclear Non-Proliferation Treaty avoids the diplomatic fallout of a withdrawal, yet the lack of progress on the treaty's obligations weakens its credibility. The treaty's effectiveness depends on reciprocal actions; Iran's inaction reduces the incentive for other parties to offer concessions or engage in further negotiations.

Overall, 2026 solidified a status quo in which Iran's nuclear programme advanced without new constraints, while diplomatic avenues remained stalled. The international community now faces a scenario where existing mechanisms provide limited leverage, and any future breakthrough will likely require renewed pressure or incentives that address both technical and political dimensions.

### Background consulted for the analysis

- [2025–2026 Iran–United States negotiations - Wikipedia](https://en.wikipedia.org/wiki/2025%E2%80%932026_Iran%E2%80%93United_States_negotiations)
- [Iran and Nuclear Weapons Production | Congress.gov | Library of Congress](https://www.congress.gov/crs-product/IF12106)
- [Timeline of the nuclear program of Iran - Wikipedia](https://en.wikipedia.org/wiki/Timeline_of_the_nuclear_program_of_Iran)
- [Iran’s Nuclear Program: Tehran’s Compliance with International Obligations | Congress.gov | Library of Congress](https://www.congress.gov/crs-product/R40094)

## What this was built from

- **Iran agrees to surrender enriched uranium stockpile by December 31, 2026?**: No, 95%; settles Friday, 1 January 2027 (polymarket). [Market](https://polymarket.com/event/iran-agrees-to-surrender-enriched-uranium-stockpile-by)
- ** Iran agrees to end enrichment of uranium by December 31?**: No, 97%; settles Friday, 1 January 2027 (polymarket). [Market](https://polymarket.com/event/iran-agrees-to-end-enrichment-of-uranium-by-december-31)
- **Iran Nuke before 2027?**: No, 97%; settles Friday, 1 January 2027 (polymarket). [Market](https://polymarket.com/event/iran-nuke-before-2027)
- **Will Iran withdraw from the NPT before 2027?**: No, 86%; settles Friday, 1 January 2027 (polymarket). [Market](https://polymarket.com/event/will-iran-withdraw-from-the-npt-before-2027)
- **Will a ≤5% Uranium Enrichment Cap (1+ Year) be in a US-Iran deal in 2026?**: No, 87%; settles Friday, 1 January 2027 (polymarket). [Market](https://polymarket.com/event/what-will-be-in-a-us-iran-deal-in-2026-20260624150226501)