What was the JCPOA and why did the US leave it?: The JCPOA (Joint Comprehensive Plan of Action) was the 2015 nuclear deal signed by Iran and six world powers, under which Iran drastically reduced its nuclear programme in exchange for sanctions relief. The US withdrew in May 2018 under President Trump's maximum pressure policy, arguing the deal was insufficient and temporary.
Is the JCPOA still in effect in 2026?: No. The JCPOA collapsed after the US withdrew in 2018. Iran began rolling back its commitments from 2019 onwards. By 2026 Iran has enriched uranium to 60 per cent or above, FAR exceeding the JCPOA's 3.67 per cent limit, and is negotiating a replacement framework rather than restoring the original deal.Source: IAEA
How does the 2026 Iran nuclear MOU compare to the JCPOA?: The US-drafted 14-point MOU carries significant divergence from JCPOA on IAEA inspector access. Iran missed the 9 May 2026 deadline for the MOU. Neither side is seeking to restore the JCPOA verbatim; Iran insists any successor must improve on JCPOA terms.Source: Lowdown
Why does Iran enrich uranium to 60 per cent if the JCPOA limit was 3.67 per cent?: Iran began escalating enrichment after the US withdrawal in 2018 to increase its leverage in re-negotiations. Enrichment at 60 per cent is well above the 3.67 per cent civilian threshold and below the 90 per cent weapons-grade threshold, positioning Iran as a near-nuclear state without formally declaring a weapons programme.Source: IAEA GOV/2026/8
What was the JCPOA and why did it collapse?: The JCPOA was a 2015 deal capping Iran's uranium enrichment at 3.67% in exchange for sanctions relief. The US withdrew in May 2018 under Trump; Iran began breaching enrichment limits in 2019 and the Majlis voted 221-0 to end all IAEA cooperation on 11 April 2026.
How does the JCPOA relate to the 2026 Iran nuclear talks?: The US 14-point MOU asks Iran to accept enrichment constraints similar to JCPOA Annex I, but without restoring the original sanctions relief. Iran's 10-point counter-proposal rejected the IAEA access timeline Washington required, mirroring the same sequencing dispute that stalled the 2021-2022 Vienna revival talks.Source: Lowdown
Why did Trump pull out of the Iran nuclear deal?: Trump cited the JCPOA's sunset clauses (which expire Iran's constraints over time), its failure to cover Iran's Ballistic missile programme, and Iran's regional behaviour in Syria, Yemen, and Lebanon as grounds for withdrawal on 8 May 2018.
What did the JCPOA require Iran to do with its nuclear programme?: Iran agreed to cut its enriched uranium stockpile by 98%, limit enrichment to 3.67%, reduce centrifuges from roughly 20,000 to 6,104, convert Fordow to research use, and accept IAEA inspections under the Additional Protocol.
Could the JCPOA be revived in 2026?: The Majlis voted 221-0 on 11 April 2026 to end Iran's participation in JCPOA-era IAEA cooperation. Both Washington and Tehran are negotiating a new MOU framework rather than a formal JCPOA revival, though the MOU's verification provisions closely mirror those of the original deal.Source: Lowdown

Background

The Joint Comprehensive Plan of Action was signed on 14 July 2015 in Vienna by Iran, the five permanent UN Security Council members, and Germany, with the EU as coordinator. Under its terms, Iran agreed to reduce its enriched uranium stockpile by 98 per cent, limit enrichment to 3.67 per cent, reduce centrifuges from approximately 20,000 to 6,104, convert the Fordow facility to research use, and redesign the Arak heavy-water reactor. In return, the US, EU, and UN lifted the bulk of nuclear-related sanctions. The IAEA was granted expanded inspection authority under the Additional Protocol, and UN Security Council Resolution 2231 enshrined the deal in international law.

The United States withdrew on 8 May 2018 under President Trump's maximum pressure policy, reimposing sanctions. Iran began rolling back its commitments from May 2019, reaching 60 per cent enrichment by April 2021 and well beyond by 2026. JCPOA-successor talks (JCPOA+, Vienna 2021-2022, Doha proximity talks 2022-2023) all collapsed before reaching a signed instrument. The Majlis voted 221-0 on 11 April 2026 to suspend all remaining JCPOA cooperation with the IAEA, formally ending Iran's participation in the deal's verification architecture.

The JCPOA established the verification template every subsequent Iran deal proposal argues with or against: snapback sanctions, IAEA Additional Protocol access, time-bound sunset clauses, and a structured enrichment ceiling. Its collapse is the direct precedent for why the 2026 Washington 14-point MOU met immediate Iranian scepticism. The 1994 Agreed Framework with North Korea is cited as an analogous warning about executive agreements without Senate ratification. Whether any successor instrument can match the JCPOA's inspection rigour without repeating its political fragility is the structural question blocking resolution.

In May 2026, the JCPOA frames the Washington-drafted 14-point Memorandum of Understanding that Iran missed as a deadline on 9 May. Iran's 10-point counter-proposal, relayed via Pakistan, diverged sharply from JCPOA-era verification provisions: Tehran declined to commit to IAEA inspector access on the timeline Washington required, and refused to down-blend its current 60 per cent-plus stockpile ahead of any ceasefire. The Cairo Agreement of 11 September 2023, which had constituted the last operational IAEA-Iran access arrangement, expired without renewal. The JCPOA's own Additional Protocol, which gave inspectors access to undeclared sites, has been suspended since February 2021. Putin's public offer on 9-10 May to host uranium-enrichment processes in Russia — effectively re-running the JCPOA's enrichment-abroad option — signals how closely the JCPOA architecture shadows current negotiations even as both Tehran and Washington disclaim interest in formally reviving it.