21-05-2024, 07:16 PM
Taxes that are dependent on the age require defining a SHAPE index, and then applying that shape either directly to the tax (fixed tax on capacity) or to a parameter defining a dummy flow for the taxes (tax on a flow).
For fixed taxes this is thus quite easy: just define the NCAP_FTAX (the tax) and NCAP_FTAXX (the shape index for that tax). For taxes on a flow it is slightly more complicated, and the process must then also be vintaged: First define the dummy commodity and the dummy flow e.g. by FLO_EMIS(source,dummy) = 1, then the FLO_FUNC(dummy,dummy) = shape index (for shaping the dummy flow by age), and then define the tax on the dummy flow by FLO_TAX, with a value that gives you the correct tax when multiplied by the shape.
There is an example on the VEDA Forum for defining an age-dependent flow: Defining dynamic emission factors.
While the example given there just defines an age-dependent CH4 emission flow proportional to the activity, it would be trivial to add a constant flow tax on that emission flow, and thereby you would get an age-dependent tax on the activity.
For fixed taxes this is thus quite easy: just define the NCAP_FTAX (the tax) and NCAP_FTAXX (the shape index for that tax). For taxes on a flow it is slightly more complicated, and the process must then also be vintaged: First define the dummy commodity and the dummy flow e.g. by FLO_EMIS(source,dummy) = 1, then the FLO_FUNC(dummy,dummy) = shape index (for shaping the dummy flow by age), and then define the tax on the dummy flow by FLO_TAX, with a value that gives you the correct tax when multiplied by the shape.
There is an example on the VEDA Forum for defining an age-dependent flow: Defining dynamic emission factors.
While the example given there just defines an age-dependent CH4 emission flow proportional to the activity, it would be trivial to add a constant flow tax on that emission flow, and thereby you would get an age-dependent tax on the activity.