Estimate the per-diem for foreign travel

There are several different ways, but it basically must be an informed guess. Since there is no set per-diem for foreign travel, you must come as close to the real expense as possible. One of your best sources for this information will be Corporate Travel (210-366-1142, 866-366-1142, uttravel@ctptravelservices.com ). Remember that foreign currency must be converted to U.S. dollars.