Accrued interest refers to interest earned on investments or loans that has not yet been paid or received. Synonyms for the term include accumulated interest, built-up interest, earned interest, and outstanding interest. The phrase is commonly used in the world of finance and can refer to interest on bank accounts, bonds, mortgages, and other types of financial instruments. It is important to keep track of accrued interest in order to properly calculate the value of an investment or loan and to ensure that all parties are paid what they are owed. Accrued interest can also impact tax liabilities and financial reporting.