Every department was ordered to give an accounting of their projected income and debts owed to the government so that the crown A) knew how much money to expect and B) could begin collecting on the debts owed to the king. However, the main sources of cash for the Agincourt campaign came from taxes levied by Parliament and loans from the city of London and other municipalities across England. Since 1407, war taxes could only be levied by the House of Commons. Henry enjoyed extremely good relations with both houses of Parliament for most of his reign, partially because he had been careful to show his willingness to work with Parliament during the reign of his father Henry IV. When he was only a prince, Henry V's campaigns in Wales were generally successful and not too expensive, so Commons felt confident in their king's ability to manage military campaigns.

The funds for these loans were provided by private citizens. As security for the eventual repayment of these loans, Henry pawned many of England's crown jewels to the various cities and towns that contributed money to his campaign. Some foreign merchants had to be thrown in jail before they agreed to loan money. In the town of Salisbury, the issue of loans caused a civil disturbance that ended in the deaths of four citizens.