So you're basically paying a tax on top of another tax, what a cheek..
Coming from the UK, I support the campaign for GST on luxuries only but I'm realistic about the difficulty in defining what is a luxury and what isn't, but paying it on your council rates (council tax) seems to be a clear cut case.
Is there any plausible reason why there should be GST on your council rates. I agree you are essentially paying for a service (refuse, highway maintenance etc), but see how long you can go for without paying and very soon you'll be forced to.
I'm trying not to rant here but it really shocked me when I opened the envelope last week..