Hover over input areas to display an explanation of its purpose.The deposit due date starts the calculator.The notice date increases the deposit penalty and starts interest on the penalty.The payment date is used to determine when to stop calculating penalties and interest.The reset button resets the calculator.The deposit amount due is what was required to be deposited with the IRS.The deposit amount owed to the IRS.The deposit penalty owed to the IRS.The amount of interest owed to the IRS.The principal amount, deposit penalty, and interest owed to the IRS.