[GNC] formulas in scheduled transaction templates?

[Elmar]

I have been watching the back and forth on automatically calculating 
taxes, etc. on invoices, and wondered about the following situation: 
when I download transactions form my bank, it gives me the net deposit 
of (e.g.) a salary.  Is there a way to create a template that 
back-calculates the various taxes and the gross amount that the net is 
derived from?  This may be US specific, but Social Security, Medicare, 
State and Federal taxes are all definable by percentage of the gross.  
But template entries (for scheduled  transactions) do allow formulas, do 
they? - Elmar