In 1914, the Banking Amendment Act gave legal tender status to the banknotes of any issuer and removed the requirement that banks authorized to issue banknotes must exchange them for gold on demand (the gold standard). Singapore and Brunei Darussalam have had a currency swap agreement since 12 June 1967. Under the terms of the agreement, Singapore dollars and Brunei dollars can be exchanged for free at face value in both countries. Thus, the currency of one country is accepted as a “usual tender” in the other country.  The history of banknotes in New Zealand was much more complex. In 1840, the Union Bank of Australia began issuing banknotes under British law, but these were not automatically legal tender. The U.S. Treasury Department prints Federal Reserve notes at the request of the Board of Governors and the 12 member banks of the Federal Reserve. These banks also serve as clearing houses for local banks that need to increase or decrease their cash holdings. Once new Federal Reserve notes are issued, they become a Federal Reserve liability that can be exchanged by holders on demand for various Federal Reserve notes. Legal tender is a form of money that courts must recognize as a satisfactory payment for monetary debts.  Each jurisdiction determines what is legal tender, but it is essentially anything that extinguishes the debt when it is offered (“offered”) to pay a debt. The creditor is not obliged to accept the payment offered, but the act of offering payment in legal tender releases the debt.
In 1844, ordinances were passed making Union Bank banknotes legal tender and authorizing the government to issue debt securities in small denominations, creating two groups of legal tender. These bonds were put into circulation, but exchanged at a discount to their face value due to the distrust of the settler population towards the colonial government. In 1845, the British Colonial Office banned the ordinance and the obligations were recalled, but not before first causing panic among the holders. In the case of coins with a face value greater than $10, a payment is legal tender only for the value of a single coin of that value. Where, by virtue of one or more obligations, several sums are payable by one person to another on the same day, the sum of those sums is deemed to be due and payable on that date. On 8 November 2016, Prime Minister Narendra Modi announced that the existing INR 500 and INR 1000 notes would no longer be accepted as legal tender in order to combat counterfeiting, tax evasion and the shadow economy.  The Reserve Bank of India has described a system whereby holders of such notes can either deposit them into their bank accounts for the full and unlimited value or exchange the notes for new ones, subject to a cap.  In many countries, the right of a merchant to refuse to do business with a person means that a potential buyer cannot force a purchase solely by presenting legal tender, as legal tender must only be accepted for debts already incurred. Between 1861 and 1874, a number of other banks, including the Bank of New Zealand, the Bank of New South Wales, the National Bank of New Zealand and the Colonial Bank of New Zealand, were incorporated by Parliament and authorized to issue gold-backed banknotes, but these notes were not legal tender. The Indian rupee is de facto legal tender in India.
The Indian rupee is also legal tender in Nepal and Bhutan, but the Nepalese rupee and Bhutanese ngultrum are not legal tender in India. The Nepalese rupee and the Bhutanese ngultrum are attached to the Indian rupee.  At the beginning of the American Civil War, the federal government first issued U.S. notes (the first greenbacks) that were not exchangeable for gold and silver coins, but could be used to pay “all fees” to the federal government. Since land purchases and import duties could only be paid in gold or new demand notes, demand notes were bought by importers and land speculators for about 97 cents on the gold dollar and never lost value. 1862 Greenbacks (legal tender notes) initially traded at 97 cents on the dollar, but gained/lost value depending on the fate of the Union army. The value of legal tender greenbacks fluctuated considerably, but trading fluctuated between 85 and 33 cents per dollar of gold. Throughout the United Kingdom, the 1 pound, 2 pound and 5 pound sterling coins are legal tender in unlimited quantities. Twentypence coins and fifty pence coins are legal tender in quantities not exceeding 10 pounds; Fivepence notes and tenpence notes are legal tender up to £5; and the cent and twopence coins are legal tender up to 20 pence.
 Under the Currency Act 1971, gold sovereigns are also legal tender for any amount. Although not specifically mentioned on them, the face values of gold coins are 50p; £1; £2; and £5, a fraction of their value in gold bars. The five-pound coins, although legal tender, are intended to serve as souvenirs and are almost never seen in circulation. The New Taiwan Dollar issued by the Central Bank of the Republic of China (Taiwan) is legal tender for all payments made in the territory of the Republic of China, Taiwan.  However, since 2007, candidates for election officials in the Republic of China are no longer allowed to file a deposit.  The thousand-guilder notes are declared invalid. It will be a blow to black market traffickers and others like them, but even more so to hidden people and everyone else who has money that cannot be explained. In order to pay for a thousand-guilder note, you must be able to indicate how you obtained it and provide proof. They can still be used to pay taxes, but only until next week. The five hundred notes expire at the same time.
Gies & Co. still had a few inexplicable thousand guilder notes with which they paid their estimated taxes for the years to come, so everything seems to go too far. In 2021, more than $2.10 trillion worth of currency was in circulation, including $2.05 billion in Federal Reserve notes and $50 billion in coins. The $100 note has the largest amount of bank notes in circulation, followed by the $1 and $20 notes. According to the Federal Reserve, the average lifespan of each note is as follows: Council Regulation (EC) No. 974/98 limits the number of coins that can be offered for payment to fifty.  The governments issuing the coins must establish the euro as the sole legal tender. Due to the different legal meanings of the term `legal tender` in different Member States and the possibility for contract law to prevail over legal tender, it is possible for traders to refuse to accept euro banknotes and coins in certain euro area countries (the Netherlands, Germany, Finland and Ireland).  National legislation may also impose restrictions on the maximum amounts that can be paid per coin or banknote. A Federal Reserve note is a term used to describe the liabilities of the Federal Reserve`s paper demand, commonly referred to as “dollar bills,” that circulate in the United States as legal tender.
For practical reasons, the Federal Reserve note is the monetary unit of the U.S. economy.