HELP!! I cannot figure out how to work tax for California!

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http://forums.oscommerce.com/viewtopic.php?p=228192#228192
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Hello 

It has been weeks trying to figure out how to work the tax for my webiste,  I really need some help from you...  This is what is happenning:

I have finally discover the problem with the tax but there is something that still not working properly and the problem is the following:

As you can see next area "the checkout area",  the tax is being calculated properly when I have the product set up as "taxable goods"  and is only calculating the tax on the product itself as it should be.

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Billing Information
 
Billing Address (Edit) 
Rodo Pacheco
445 St. Nowhere
los angeles, CA 90041
United States 

Payment Method (Edit)                                  PayPal 

Sub-Total:                    $430.78 
Table Rate (Best Way):   $11.50 
California Sales Tax:      $32.83 
                     Total:     $442.28 
 
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Now here is the problem, when I set up the products in this case with price of $ 397.95 which is the price it should show in the website,  and I change this product "tax class" to "taxable goods" the price in that field changes to $430.78 with is the price with the tax included.   As you can see in the following area......  (which is the "Entering new product screen"

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Date Available:
(YYYY-MM-DD)   dateAvailable.writeControl(); dateAvailable.dateFormat="yyyy-MM-dd";  
 
Products Manufacturer:  --none-- 
 
Products Name:              5.5" In-Car DVD Player with TV/Monitor
   
 
Tax Class:                     Taxable Goods 
Products Price (Net):       397.95
Products Price (Gross):    430.7809  <------ here is calculating the 8.25% california tax automatically!
 
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NOW in my website   www.productmaxusa.com for this product is showing 430.78 intead of 397.95   WIRED!  which is the only product I am testing like this.   And this is the link (it will be the first one) http://www.productmaxusa.com/index.php?cPath=24_37   tha the actual price is 397.95 but is placing it with the tax already of 8.25% for Ca 

Is showing the price with the tax included intead with out the tax as it should be.  


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This is the way it appears in the website.


   5.5" In-Car DVD Player with TV/Monitor   $430.78    


NOW the  funny thing is that when I sign in as a California customer it shows this price,  but when I sign in as another state it doen't.

CAN SOMEBODY HELP ME BEFORE I GO CRAZY!!!!

Thank you very much to all of you....  

Rod. :cry: