Since the IRS employees can't be trusted with simple password-based security, it's time to inject them with RFID chips. Then all they have to do is plant themselves with range of their workstations, and the computer will recognize the chip and grant them access (as long as they are in range).
Now, for normal citizens, this is a very lightly-invasive procedure, since the chips are almost microscopic in size. However, this is a government operation, and therefor Milspec chips will be required. As everyone knows, Milspec chips are 10 times as large (and 100 times as expensive) as ordinary chips, so the implant procedure is going to be somewhat uncomfortable. To minimize the discomfort, the chips should be inserted into the buttocks. Security requires a good, deep implant - snuggled right up to the pelvis, I should think.
And, to ensure good security, the chips (which are now acting as the employee's "password") must be removed and replaced with new chips every 90 days. Sorry, that's just policy; we can't change it for just one government agency, now, can we?