In your Accumula Settings taxes are setup by default to use Match on Tax Code Name mode. That mode simplifies taxes and reporting in the point of sale.
For the most specific tax calculation, you may use Taxes as a Line Item mode. In this mode the total tax charged in Shopify is combined into a line item in POS called "Shopify Taxes". The order, invoice, or sale in your Point of Sale will have the Tax Name, "No Tax", with a 0% rate applied.
This can be seen in the below screenshot from Lightspeed Retail:
This tax mode can be set in your Accumula Settings at Apps > Shopify > Taxes:
For Taxes as a Line Item to function correctly, you must have 2 Tax Names in Point of Sale; "Shopify Taxes" and "No Tax", both with a rate of 0%.
If your business is based in the United States and you wish to use this mode, we recommend checking “I want to specify taxes automatically” in Shopify Tax Settings. This will provide the most accurate tax calculation within Shopify. Simply go to Settings > Taxes in Shopify, click United States, and check the “I want to specify taxes automatically” checkbox.
In this mode to find a breakdown of your regional tax obligation you will need to run tax reports from Shopify. In your point of sale it is recommended that you run a report for line items and filter for only the "Shopify Taxes" product.
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