The Riksbank said outdated 20, 50 and 1,000 krona notes worth a total of 1.3 billion krona (€136 million) had not been deposited despite tomorrow’s deadline for free exchanges.

Old notes deposited after 31 August will be subject to additional checks under money-laundering legislation and people could be charged a fee.

Even more new notes and coins will be introduced in October and Swedish authorities are concerned about a repeat of the situation.

Around 1.6 billion coins will become invalid in June 2017.