Consider a credit portfolio that consists of default-sensitive instruments such as lines of credit, corporate bonds, and government bonds.
The corresponding credit value-at-risk, is the minimum loss of next year if the worst 0.03 percent event happens.
In another words, 99.97 percent of the time the loss will not be greater than Value-at-Risk.
Note that the credit Value-at-Risk is measured at the time span of one year and is different from the 10-day convention adopted by market Value-at-Risk.
0.03 percent is chosen because it is a rating agency standard of granting an AA credit rating.