War bonds are debt securities issued by a government to finance military operations and other expenditure in times of war. In practice, modern governments finance war by putting additional money into circulation, and the function of the bonds is to remove money from circulation and help to control inflation. War bonds are either retail bonds marketed direct to the public or wholesale bonds traded on a stock market. Exhortations to buy war bonds are often accompanied by appeals to patriotism and conscience. Retail war bonds, like other retail bonds, tend to have a yield which is below that offered by the market and are often made available in a wide range of denominations to make them affordable for all citizens.
Governments throughout history have needed to borrow money to fight wars. Traditionally they dealt with a small group of rich financiers such as Jakob Fugger and Nathan Rothschild but no particular distinction was made between debt incurred in war or peace. An early use of the term "war bond" was for the $11 million raised by the US Congress in an Act of 14 March 1812, to fund the War of 1812, but this was not aimed at the general public. Until July 2015, perhaps the oldest bonds still outstanding as a result of war were the British Consols, some of which were the result of the refinancing of incurring debts during the Napoleonic Wars, but these were redeemed following act of Parliament.
The government of Austria-Hungary knew from the early days of the First World War that it could not count on advances from its principal banking institutions to meet the growing costs of the war. Instead, it implemented a war finance policy modeled upon that of Germany: in November 1914, the first funded loan was issued. As in Germany, the Austro-Hungarian loans followed a prearranged plan and were issued at half yearly intervals every November and May. The first Austrian bonds paid 5% interest and had a five-year term. The smallest bond denomination available was 100 kronen.
Hungary issued loans separately from Austria in 1919, after the war and after it had separated from Austria, in the form of stocks that permitted the subscriber to demand repayment after a year's notice. Interest was fixed at 6%, and the smallest denomination was 50 korona. Subscriptions to the first Austrian bond issue amounted to the equivalent of $440 million; those of the first Hungarian issue were equivalent to $235 million.