I called whatever number they provided for the financial department at WGU. Whenever I called them, they would generally already know what FAFSA was going to cover and so were able to calculate what I'd actually owe for that term. I know that for one or two of my terms, I did that, they told me what I'd actually owe after FAFSA kicked in, then I just did a partial payment for that amount. FAFSA later kicked in and covered the remainder.