Sales Tax database

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http://androidforums.com – I'm messing around on a simple app I created back when i first started working on android apps (eating out tip calculator). My question is if anyone knows of a extension, url, or anything that is already out there that has all sales tax percentages that would be used in any restaurant or diner or pubs. I want to have this table (possibly add it to sqlite table) so I dont need to ask the user for the tax rate. Does anyone know of such information? I know there is probably alot more ahead of me (collecting user general location/region w/o gps permission). (General)