The term 'BILL LINE' can be broken down into three crossword solutions: TAX (3 letters), AMOUNT (6 letters), and SALESTAX (8 letters). TAX is a fee imposed by a government on a product, income, or activity. AMOUNT is the total number or quantity of something. SALESTAX is a TAX imposed on the sale of goods and services. Together, these three words form the term 'BILL LINE', which is a line item on an invoice that includes the AMOUNT of TAX due for a particular purchase.