Show Zero If TextBox Empty

I realize that this is a topic that has been well tread in the forums; I've read many of the responses. Unfortunately even after adapting these responses, my code isn't working as I would hope. I have many textboxes on a userform, and often they can be left without any input from the user. Unfortunately the textboxes serve as the arguments for a function. If the value is zero, the function works as it should. Here is the code I have:

Private Sub txtSalary_Exit(ByVal Cancel As MSForms.ReturnBoolean)
Dim Salary1
If IsEmpty(Me.txtSalary) Then
MsgBox ("It's empty")
Val (Me.txtSalary.Text)
Me.txtSalary.Value = "0"
Else
Me.txtSalary = Format(Me.txtSalary, "$0,000")
End If

The idea was that when the user left the box, if it was empty it would have a value of 0, but if it had a number, it should be formatted to currency without the decimal point. Unfortunately, the "IsEmpty" line doesn't seem to be working. I tried to just use a simple msgbox to check, but when I tab out of the textbox without typing anything, nothing happens. If sure there must be a simple solution I'm missing.