What does "GST Amount Discrepancy / Diff. Montant TPS" mean?

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I received an error message in my WebForms inbox from Loblaw that says "GST Amount Discrepancy / Diff. Montant TPS." What does that mean and how can I fix this problem?
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Posted 6 years ago

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Andrew Richner

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This message is automatically generated in Loblaw's system when they are unable to verify the HST tax amount. You may also receive variations such as "GST Summary Discrep / Diff. Sommaire TPS," or "GST Summary Tax Is Over Limit." In trying to determine why your invoice got rejected for this reason, it's important to understand how Loblaw verifies this information. Since the HST, GST, PST, and QST are charged depending on the location where the goods or services are received, Loblaw calculates the tax percentage they expect to see on an invoice based on the Ship-To DUNs number that you indicate on the Header tab. If the purchasing distribution center whose DUNs number goes in this field is not the first distribution center to which the product is delivered, you will need to indicate this by adding the appropriate routing code by province to the DUNs number. You can check for these routing codes in the Partner Information section of your SPS Commerce portal.

If there isn't any problem with the Ship-To DUNs number, then you can double-check that the taxes are correctly indicated on the Item tab. You will need to include one tax line per tax type per line item on every invoice. This means clicking the pop-out window on each line item. Make sure to calculate the tax amount after having added all applicable allowances and charges per line item. The tax amount should equal the line item shipped quantity multiplied by the unit price, multiplied by the current federal GST tax rate.

If you can verify that taxes on each line item have been correctly calculated and added to the invoice, then you can go to the Summary tab and verify that the taxes for the entire invoice are correctly added as tax lines for each tax (e.g. HST, GST, PST) charged on this invoice. Not only should this be equal to multiplying the tax rate by the invoice total, but should also equal the sum of each line item tax total.

Please remember that when you re-send your invoice to Loblaw, you should never use the exact same invoice number, even if the first version of that invoice was rejected. We usually recommend putting a small letter a at the end of your invoice number to avoid confusion for you and so that Loblaw's system can accept it.