http://dor.wa.gov/Content/FindTaxesAndRates/RetailSalesTax/DestinationBased/OnlineSellers.aspx
“The Department of Revenue recognizes that sellers using online shopping carts face unique challenges to change to destination-based sales tax. Some shopping carts have limited capabilities in calculating sales tax. For example, some will only accept one tax rate per state; others apply tax rates only using a 5-digit ZIP code. As you may know, Washington has about 16 different sales tax rates within multiple taxing jurisdictions (about 355) and 5-digit ZIP codes do not accurately correspond with tax rates or taxing jurisdictions.
It is ideal if the shopping cart can use the actual delivery address or the corresponding ZIP+4 code, either of which will deliver an accurate tax rate and taxing jurisdiction. However, that is not available to many sellers at this time.
Although calculating sales tax by address or ZIP+4 codes is most accurate, we understand that it is currently not possible for everyone. In the interim, the Department’s expectation is that sellers will do their best to determine the correct tax rates to collect and to report the sales to the correct jurisdictions when filing their tax returns. If the sales tax collection method used results in the over- or under-collecting of tax, sellers are still required to remit all tax to the Department of Revenue, or if requested, refund the over-collected tax to the customer.”
lifted unceremoniously from the DOR site for your review.
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You can read the whole article on the DOR site, but we wanted to be sure to state emphatically that there IS a zip+4 sales tax collection solution that is NOT only available, it’s in use today. If you have a store that needs the most accurate tax collection mechanisms available today, AccurateTax is here.



