Mike,
Typically.., some sort of 'code' or 'flag' is used to show current
status. What these are is entirely user specific such as your
suggestion to use "n/r", for example. I'd avoid using a slash
character, though, as your example "n/a" is an intrinsic error flag.

You don't need to be consistent in the length of the status code IMO as
it's more benefit it be descriptive in context to its usage...

T0 = Taxable at TaxRate0 (0%)
T1 = Taxable at TaxRate1
T2 = Taxable at TaxRate2
NT = Not Taxable
TX = Tax Exempt
...and so on

HTH

--
Garry

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