IIf Expression: The first of many questions. Thank you in advance.

Question

One of the situations I am in need of assistance with is the following "IIf" statement:
=IIf([Check36]=Off,10,0)           The expression is located in a field [LateFee].
When, [Check36], is Off, $10.00 is displayed, if On then $0.00 is displayed.
I have come to conclusion that this statement is correct and functional, although, it is not complete to my necessity.
I'm wanting to include another action to the expression:
=IIf([Check36]=off >=11th Day of any month then,10,0)
In effect, what I would  like to express is that if the Check Box [Check36] is Off any Day of the Month > = to the 11th Day, then the [LateFee] will display 10,0
Pardon the inquisition, although, I've really caught the bug and I would like to locate the correct answer. 
Jason

Answer 1

You don't need '=Off'.  A check box control has a value of a Boolean TRUE or FALSE, so simply reference the control by name:
    =IIf([Check36] And Day(Date())>10 And Time() > #12:00#,10,0)
This will return 10 if the value of the check box is TRUE and the current date is after the 10th of the month, zero otherwise.  You can see how it works in the debug window today, 6th march at 12:50 PM with:
Check36 = TRUE
? IIf(Check36 And Day(Date())>10 And Time() > #12:00#,10,0)
 0
If we change the expression so that the relevant date is after 5th of the current month, yesterday as of now, we get 10:
? IIf(Check36 And Day(Date())>5 And Time() > #12:00#,10,0)
 10
If we change the Boolean value to FALSE:
Check36 = FALSE
we now get zero:
? IIf(Check36 And Day(Date())>5 And Time() > #12:00#,10,0)
 0
Is this what you are aiming at?
However, I'd recommend that you don't accept the default name like Check36 which Access gives to a control when you add it to form, but change it to some meaningful such as chkLatePayment.  Always do this immediately on adding a control to a form, not
after you've inserted any code in one f the control's event procedures.  If you change the name afterwards the link between the control and the event procedure will be broken.
Ken Sheridan, Stafford, England