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>>I an cite at least one example of this, in NY State, where on-site service rendered at multiple locations are subject to different local tax structures.
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>NYS example #2 - clothing purchases under $110 are exempt from state sales tax. However, some counties retain their local sales tax on these items. Rates vary wildly. Makes tax reporting a nightmare.

NY is even worse than the People's Republic of Taxachussetts to my North; I have a client who moved his operations to VT from NY just because of the sales tax issues for their products in NYS. And now, with Comrade Hillary a Senator, she'll endeavor to complicate things even more, especially with Slick Willy surrenduring his law license for 5 years. Bets on new tax rules regarding income derived from royalties, speaking engagements and personal councilling services?