Sum Certain A legal description of the predetermined settlement price for a contract or negotiable instrument. Investopedia Says: This term refers to the stated final payment to be made at the end of a contract. A digital option is an example of a financial product with a sum-certain payment. After a set price is met, the payout is fixed instead of depending on or relating to the underlying security and strike price. Related Terms: Date Certain Digital Option In the Money Strike Price Underlying |