Legal Tender

Eva wants to pay cash abroad, but the merchant asks for a card. She is surprised: a central bank issued her banknote. Yet genuine money and an obligation to accept it are different questions. She first needs the rules of the particular country. The UK’s central bank, the Bank of England, the US Federal Reserve and the European Central Bank (ECB) describe different situations. Legal Tender is a useful starting point, not a universal answer for every checkout. [1] [2] [3]

The Bank of England explains that a British shop can choose its payment methods. It describes protection against being sued for non-payment when full repayment of an existing debt is offered in legal tender, unless a contract specifies another form. A new purchase and an existing debt are therefore different situations. Eva choosing goods is not in the same position as someone paying an obligation already due. Simply showing a banknote does not make a debt vanish either; the conditions for a valid offer of payment matter. [1]

In the United States, the Federal Reserve points to 31 U.S.C. 5103, which recognizes US money as a lawful offer to pay a debt to a creditor. It also explains that federal law does not generally require private businesses to take cash for goods or services; state rules may say otherwise. Eva cannot use a single statement about federal law to settle the question for every US shop. The rules where she is buying matter too. [2]

On reaching the euro area, Eva cannot simply carry the British explanation with her. The ECB describes acceptance of euro cash as the starting rule, allowing an agreed alternative and justified exceptions. Under that explanation, a sign refusing cash alone is insufficient. A legitimate reason could concern a shortage of change or a concrete security risk. An actual agreement or reason for refusing payment must therefore be distinguished from a notice on the door. [3]

The Bank of England and the UK’s coin producer, The Royal Mint, give a total payment limit of 20p for 1p and 2p coins—one penny and two pence. Our example of 21 coins of 1p is worth 21p but exceeds that limit. The coins have not become worthless or counterfeit. That particular legal effect simply does not cover the amount offered in that form. The parties can still agree to accept the coins. A denomination, meaning the value marked on a coin, can therefore matter as much as authenticity. [1] [5]

Eva ends up paying by debit card in the British shop. Yet the Bank of England explains that debit cards and cheques are not Legal Tender. There is no contradiction: a widely accepted payment method need not have this particular status. Actual use and legal status are separate matters. The same distinction helps with bitcoin. One person’s willingness to accept it for goods does not, by itself, establish a legal duty for another merchant. [1]

El Salvador provides a useful example. In February 2025, the International Monetary Fund (IMF) described a reform introducing voluntary private acceptance of BTC and tax payments only in US dollars, or USD. Bitcoin’s historical status therefore does not establish mandatory acceptance today. That release is not a complete account of current Salvadoran law either. For a particular payment, we need the applicable rule and the kind of obligation involved; a private purchase and a tax may be treated differently. [4]

Eva now asks more than whether her money is legal tender. She checks where she is paying, whether a debt exists, what the contract says, and whether the amount and coins or banknotes satisfy the relevant conditions. For BTC, she also checks the rule’s applicable version and date. These questions bring her closer to a useful answer than the label alone. The status does not guarantee purchasing power: being legally able to settle an obligation says nothing about how much the same money will buy later. Nor does it ensure that a bank transfer is automatically carried out. [1] [3] [4]