PFL in box 14 is not a tax at all.  It's the amount of COVID wages paid.  Unless your client is also self-employed it has no bearing on the return.  If your client is self-employed it will go on Form 7202 line 15 or line 16 and affect the calculation for the self-employed amount of the credit.

Edit: Phoebe had a better crystal ball than I did. 🙂