Hi.
we only have the ER-150, but it will probably be the same for tax programming.
There are three settings, and it depends how you need it to print, so I'll give you all three. Just try programming the first one, then go back to reg mode, and try it. If it doesn't work as you expect, then try the next code etc.
Set the switch to P (program) mode.
Type 72500, then press TAX button
If no good, use 72501 TAX
or 72502 TAX
Hope this helps.
Mark, August 2008