Contributions

A modification to the previous contribution, adding a complete list of Zip codes for LA County (as of 08/2011). Included also, the code has been modified to check the customer state first (CA in this case ID #12) before running the list of zip codes. There are about 308 zip codes in this list so reversing the code to check the state before zip should save processing time and seems to load quicker.

This is an update to allow you to set multiple zip code based tax rates. Works good for having seperate city, county, and state rates.

Fixed problems in mod where TRUE and FALSE were enclosed in quotes, and return $sate_tax_rate; misspelled.
Follow original instructions (note I have changed this to California / San Francisco, but zip codes have not been updated)

This contribution will allow you to charge county sales tax according to zip code. You enter in all zip codes for your county and if sellers billing addresss zip code is one of those zip codes, they will be charged the county tax.

Very easy install...modifies one file only.