To change the tax rate on a purchase order, change the change number after "Tax" on the Main Purchase Order Screen.

Tax percentages are expressed as decimals.  For example, if the tax rate is 7%, type in .0700.  AnyPO will also accept fractions of a percent.  If the rate is 8.55%, enter .0855 in the blank.

Note: if you frequently work with one tax rate (base tax rate), you can set the default value in Basic Setup.