Where are you entering the code?
Do you get any error messages?

Richard has a couple of videos on Input Masks.

Input Mask
Input Masks Varying Length

I didn't know where to put it, so I tried putting it in the forms On Load Event, but it kept giving me an error.  I'll check out those videos again.  Thanks.

I'm getting closer, but it's acting weird.  Below is my code.

When I open my database the Filter_Year defaults to this year, and when I open the form to enter the receipts, the code works perfect. I have SetDateInputMask in the On Current Event.

I can change the Filter_Year to 2022, and the code works perfect letting me enter the year.

HOWEVER, if I change the Filter_Year BACK to 2023, and open the form again, it still gives me the input mask for previous years.

The only way I have been able to get it to work again is to close the dabase, and reopen it.
I also tried putting SetDateIputMask in the On Load Event but that didn't help.
Can you tell me what I am doin wrong?
-------------------------------------------------------------
Private Sub SetDateInputMask()
    
    If Year(Date) = Forms!Shortcuts!Filter_Year Then
        TransactionDate.InputMask = "99/99;_"
    Else
        TransactionDate.InputMask = "99/99/9999;_"
    End If

End Sub

Try setting a hidden text box to a date in the current year and a visible text box that shows the year from the hidden box.
The image below shows how to do this and the input mask changes correctly each time the year is changed.

In case you are interested I added some error handling to the date filter (see screenshot).

@Kevin Robertson, you are a genius!  It took me a couple of tries following your lead to fully understand and get it right, but it now works perfect!  Thank you so much and for the Error handler also.  This is going to make entering my tax receipts so much easier and eliminate duplicate forms just  to set the date!  Tips on the way! Wish I could afford more.