This budget software provides several extra fields for each transaction. They can be used to enter necessary information, such as receipt number, confirmation, transaction number in the bank statement, etc. You can rename extra fields by clicking the "..." button or via Tools of the main menu. Tax is entered as a number (not percents). If the number is positive, this is a tax. If the number is negative, it is a discount.
Links to web pages or external files can be added as well. These files are not stored in the database, only links.