When creating formulas in Excel you are required to use the ROUND function when these three conditions are TRUE: 1) You are required to round, like with Money., 2) You re building a budget, an invoice or a set of payroll calculations., 3) You are NOT using formulas in subsequent formulas. 1) You are required to round, like with Money., 2) You have extraneous decimals, like past the penny position. This occurs often when you multiply or divide decimals., 3) You are NOT using formulas in subsequent formulas. 1) You are required to round, like with Money., 2) You have extraneous decimals, like past the penny position. This occurs often when you multiply or divide decimals., 3) You will use formula result in a subsequent formula.