The European Central Bank should make proposals on how to reduce security risks linked to the 500 euro note, which can be used for the financing of terrorism, the head of euro zone finance ministers says.
Almost 30 per cent of the more than 1 trillion euros ($A1.6 trillion) of cash in circulation last year was hoarded in 500 euro notes, ECB data show.
The banknote is one of the most valuable worldwide, with a value more than five times higher than the largest US equivalent currently in circulation, the $US100 bill.
"We are going to ask the ECB to look at cash money and the accessibility of the 500 euro note," Dutch Finance Minister Jeroen Dijsselbloem told reporters ahead of a meeting of EU finance ministers in Brussels.
"There are risks that large notes and large cash amounts can be easily used for terrorism financing," said Dijsselbloem, who is permanent head of euro zone finance ministers.
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The request for a probe on the 500 euro note comes amid an EU clampdown on all means of payment that may be used to finance terrorist acts. It was triggered by the attacks in Paris last November by Islamic State militants that killed 130 people.
The European Commission, the EU executive arm, proposed last week to increase controls on prepaid payment cards, virtual currencies such as bitcoin and other possible source of financing for terrorist organisations.
It also warned about the risks of 500 euro notes, mulling possible ceilings on cash payments.
The ECB is in charge of making decisions on the euro banknotes in circulation.
The 500 euro note has raised concerns also in relation to fraud and corruption. In an interview in January, the top EU anti-fraud official called for the banknote to be withdrawn.
