OPEC+ has pushed back a long-planned review of its members' crude production capacity, according to people familiar with the group's deliberations, after the war between Iran and Israel disrupted expansion plans across the Persian Gulf producer group.

Reuters reported the delay exclusively, citing sources who spoke on condition of anonymity because the discussions are confidential. The review — a process that would establish how much crude each of the alliance's members can realistically pump — was already one of the most politically sensitive exercises on the OPEC+ calendar before the conflict added a new layer of complication.

The Iran war is the proximate cause. Military strikes in June interrupted work programs that several producers had counted on to grow or even sustain capacity, the sources said. That matters for OPEC+ because the review is meant to reconcile each country's officially declared production baseline with what its fields, export terminals, and processing infrastructure can actually deliver. Any recalculation done now would be built on a snapshot distorted by war-related outages and delayed projects.

For the group's core Gulf producers — Saudi Arabia, the UAE, and Kuwait — capacity numbers are both an operational metric and a bargaining chip. Saudi Arabia has long maintained that it can pump roughly 12 million bpd, a figure Riyadh uses to anchor its influence within the alliance and its credibility as a swing supplier to global markets. Any formal review that re-examined those numbers would have direct consequences for quota allocations when OPEC+ next negotiates output policy.

Iran, a founding OPEC member, sits at the center of the complication. Its oil sector has operated under US sanctions for years, and the war damage adds fresh uncertainty to any estimate of what Tehran could produce, let alone what quota it might eventually claim if sanctions ease. Iraq, the group's second-largest producer, has its own long-running disputes over capacity accounting, stemming from semi-autonomous Kurdish exports and chronic infrastructure bottlenecks at its southern Gulf terminals.

The delay buys time, but it also defers a decision the alliance cannot avoid indefinitely. OPEC+ has spent the past two years unwinding its most recent round of production cuts, and a group that is steadily restoring barrels needs credible, agreed capacity numbers to know where the unwind stops. Analysts have argued for months that several members — those whose output collapsed during the 2020 demand collapse and the investment drought that followed — cannot physically deliver the volumes their baselines imply. That view is analysis, however, not an agreed fact within the group; the sources Reuters cited did not provide updated country-by-country capacity estimates.

What is clear from the reporting is the sequencing. The capacity review will wait until the disruption caused by the Iran war can be properly assessed and until expansion projects interrupted by the conflict have a firmer restart timeline. No new date for completing the exercise was disclosed.

The watch items for traders and planners follow directly. First, the next full OPEC+ ministerial gathering, where delegates will inevitably face questions on when the review will resume — watch for any guidance in the closing statements or press conferences. Second, the pace of restoration of the group's voluntary cuts, which the alliance has been accelerating in tranches; how long that acceleration can continue without agreed capacity numbers is now an open question. Third, Iran's post-war export recovery itself, which will shape both the technical basis of any future review and the political calculus around it.

Until OPEC+ resets the exercise, the group will keep setting policy against baselines that fewer and fewer participants — or their customers — regard as a reliable measure of real-world supply capability.