Ok, here is a way if you want to avoid input masks, to chop off the leading zeros via code:
In the control's AfterUpdate event, place the following code:
(this assumes the textbox control's name is txtID. You'd need to modify it for your needs)
dim strLetter as string, strID as string, i as integer
strID = txtID.value
i = 0
do until mid(strID,i,1)<>"0" or i>len(strID)
i=i+1
loop
strID = Right(strID, len(strID) - i)
txtID.value = strID
Please let me know if you have any questions on how to do this, or if you run into any problem with the code.