Split a Fee into Thirds

One of my clients sometimes allowed payments of a certain fee over time.  With the click of a button, the program splits the fee into thirds with standard due dates.  The invoice is generated automatically as each payment becomes due.

Here's the fee before clicking the button:

And here are the three installments created automatically.  Note that the last installment due has automatically been decreased by a penny so the total of the three exactly equals the amount of the original fee (this is only done when necessary):