Alliance Boots, one of Europe's leading drugstore chains, has been accused of avoiding a tax bill of over £1 billion ($1.6 billion) since going private six years ago, becoming the latest multinational to come under fire for its tax affairs.
Anti-poverty charity War on Want, British union Unite and the Change 2 Win federation of U.S. trade unions said the company, which owns pharmacy chain Boots in the U.K., had avoided "at least" £1.12 billion tax since 2008.
Corporate tax avoidance has become a hot topic across Europe following revelations last year that global companies including Starbucks, Google, Apple and Amazon paid little, despite racking up millions in sales.
(Read more: Low Corporation Tax 'Crucial Profit Driver')
The British government pledged to crack down on tax avoidance following public outrage at the lack of corporate contributions to the Treasury amid the implementation of wide-spread austerity measures.
In a report entitled "Alliance Boots and The Tax Gap," published on Monday, War on Want, Unite and Change 2 Win claimed the pharmacy chain took on debts, shifted profit and undertook corporate restructuring to avoid paying tax.
Alliance Boots was delisted from the London Stock Exchange in 2007 following a private equity buyout by U.S. firm Kohlberg Kravis Roberts and the company's deputy chairman, Stefano Pessina.