Weston urged the Labour Government not to raise taxes on businesses further in the forthcoming November Budget, highlighting existing cost increases such as national insurance and the national minimum wage.
Chancellor Rachel Reeves faces the challenge of boosting Treasury revenues to address a potential £40 billion deficit, intensifying concerns that businesses could be targeted with further tax hikes.
Primark, which operates over 190 stores in the UK, is expected to face significantly higher business rates under the new proposals, which shift the burden to larger retailers.
The British Retail Consortium and tax firm Ryan have warned that a new business rates surtax could jeopardise 400 large-format stores, costing them an estimated £45.8 million annually and undermining investment.