Why is my federal return $2400 less than what I filed? Was the Stimulus paid back from my return?

You would be entitled to $1,200 of stimulus money for each taxpayer listed on your return plus $500 for each dependent under the age of 17 for the first round, and $600 for each person I just mentioned for the second round of stimulus payments.

When you prepared your tax return with TurboTax, you were asked to entered how much of the stimulus money you actually received. The balance  would be refunded to you. It is possible that you entered the wrong amount of money you received when you completed your tax return, and that would result in your refund being adjusted.

The only other likely possibility would be that a stimulus payment was sent to you that you haven't received yet or didn't receive. In that case, you will have to contact the IRS and inquire about your missing stimulus payments.