Goldman Sachs says UK could gain up to £150bn if it rejoined the EU single market

Goldman Sachs has argued that the United Kingdom’s economic outlook could improve substantially if it were to rejoin the EU’s single market, according to an assessment cited by the Telegraph on October 14, 2026.

The report says Goldman Sachs estimates a potential boost to the UK economy of as much as £150bn from rejoining the single market. The figure is framed as a broad economic gain rather than a narrow sector-specific effect, but the publicly cited claim does not lay out, in the available posting, the underlying modelling assumptions or which channels drive the total.

The UK’s relationship with the EU has been one of the defining economic policy questions since Brexit, with business groups and governments repeatedly returning to the trade-off between greater regulatory autonomy and friction from operating outside the EU’s rules and internal market. Against that backdrop, Goldman’s estimate, as presented, adds new weight to the argument that market access and reduced cross-border barriers can have measurable macroeconomic effects.

In market terms, the single market concept is about allowing goods, services, capital, and people to move with comparatively fewer regulatory and border frictions across participating EU countries and aligned regimes. Rejoining it would be expected to involve significant legal and regulatory alignment, though the cited coverage does not specify which areas of alignment Goldman Sachs focuses on or how it would interact with the UK’s existing trade arrangements.

Goldman’s position, at least as reported, comes amid ongoing policy debate in the UK about whether closer economic integration with the EU is achievable and, if so, at what cost. A claimed figure as large as £150bn would typically be the kind of headline number used to summarize benefits that may include lower compliance costs for firms, improved market access for services and trade, and higher investment confidence from reduced uncertainty. However, the available report does not provide the disaggregation needed to evaluate which of those mechanisms are responsible for the total.

The bank’s estimate also matters for how investors and corporate planners might think about longer-term demand, staffing needs, and supply-chain decisions. Even when specific beneficiaries are not named, large macroeconomic projections can shape expectations about the growth environment, which can in turn affect how companies price risk and plan capital spending.

Still, key details remain unclear from the coverage available here. The cited post does not disclose the time horizon for the £150bn estimate, whether the estimate refers to additional output, welfare, investment, or another measure, or whether it is presented as a central case, upside scenario, or sensitivity range. It also does not specify what policy pathway Goldman Sachs assumes for rejoining, such as staged participation, full alignment, or changes to existing agreements.