Rachel Reeves chose to stress the long-term damage done to the UK economy by the 2020 Brexit deal, in her remarks at a key international economic committee at the International Monetary Fund (IMF).
In remarks published this weekend, the chancellor told the world's leading finance ministers and central bankers: "The UK's productivity challenge has been compounded by the way in which the UK left the European Union."
She quoted the Office for Budget Responsibility's calculation of a 4% long-term hit relative to remaining in the EU, and said the UK "acknowledges this" in seeking stronger trade ties.
Labour had been reluctant to stress arguments about economic downsides from Brexit.
However, since its conference last month, ministers have been increasingly strident in making such arguments.
