I've never had to implement it, but as I understand it, sales tax is much more complicated than that simple table can show.

Luckily, as starX has said, you're only obligated to deal with sales tax where you have a presence, as the states aren't allowed to tax interstate commerce. (Quill Corp. v. North Dakota, 112 S. Ct. 1904, 504 U.S. 298 (1992))

Some of the stranger tax rules in Washington, DC that I'm aware of:

• Although food sold in DC is normally tax-exempt, food that is sold ready-to-eat (eg, refrigerated 1L bottle of soda) qualifies as a 'snack' and is subject to restaurant tax (10%), not the normal sales tax (5.75%)
• For a week or two before school starts, school supplies and clothing under $100 (per item) are exempt from sales tax.
• A number of items are taxed on top of (in place of?) normal sales tax, eg, cigarettes and gasoline.

I've also heard of regions where towns have sales taxes on top of the state sales taxes, but I have no idea if this is true or not, and if it applies to items shipped out of the area

I'd highly suggest talking to a local accountant. I know the SSTP was supposed to take care of much of the problems, but I've never dealt with it (I had looked into dealing with sales taxes when it was still in a planning phase).

Update: In case I wasn't clear enough, the point of this is that there is a lot that I don't know about taxes, and I suggest people contact accountants in their area or someone qualified to advise them, rather than just use a table of taxes by state

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