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As per CRA,
Box 19 – Face amount
If the security represents indebtedness (for example, bonds and other debt obligations), enter the nominal value, in dollars and cents, that appears on the face of the document (that is, the amount to be repaid at maturity).
Leave this box blank if the security does not have a face amount (for example, shares or commodities).
Face Amount: The nominal value that appears on the face of a document, generally a bond. It is the amount to be repaid at maturity.
A $10,000 Treasury bill is disposed of before it matures, and the bearer gets $9,500. The proceeds of disposition are $9,500. Enter "9,500" in box 21. Since the face amount of the Treasury bill is $10,000, you would enter "10,000" in box 19.