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Collecting Australian GST—which has just one rate for the entire country—was EASY compared to collecting Washington State sales tax, which has 355 separate tax districts. And we can't easily look up the tax district for a given address—the state provides only the geographic coordinates defining the boundaries of each district, which are updated on a quarterly basis. So we have to use a geolocation service to get the coordinates for an address, then compare that against the current boundary data to calculate which district the address is in, and then compare that to the current rate table (also updated quarterly) to figure out how much tax to charge.

Steve Geddes |

Thanks for letting us know!
Collecting Australian GST—which has just one rate for the entire country—was EASY compared to collecting Washington State sales tax, which has 355 separate tax districts. And we can't easily look up the tax district for a given address—the state provides only the geographic coordinates defining the boundaries of each district, which are updated on a quarterly basis. So we have to use a geolocation service to get the coordinates for an address, then compare that against the current boundary data to calculate which district the address is in, and then compare that to the current rate table (also updated quarterly) to figure out how much tax to charge.
What a terrible idea! :o