A Per Diem is an allowance or amount of a budget that an organization will give to an individual to cover living expense while traveling on behalf of that organization. In most cases this is used primarily for food and lodging, but it is up to the organization to determine its rules and amount.
Whistle makes it easy to send and manage Per Diem payments because transactions from a Per Diem budget can only be used by appropriate merchants and the transactions are automatically recorded for both the individual and company.
The US government publishes a standard Per Diem rate it uses for government employees.
For additional information about Per Diem payments and the rules related to taxes visit the IRS website