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How to Fix “Could Not Apply the Payment More Than the Amount Due” Error in Webgility Desktop

This article helps Webgility Desktop users resolve the “could not apply the payment more than the amount due” error encountered in Webgility Desktop when posting orders to QuickBooks Desktop. It explains that this issue is typically related to sales tax calculation settings and provides guidance on adjusting the sales tax posting method to ensure accurate payment application and smoother order processing.

Causes of the Issue

This error typically occurs due to one or more of the following:

  • Sales tax calculation mismatch: QuickBooks calculates tax differently than the sales channel.

  • Incorrect posting method configuration: The setting “Let QB Calculate” can cause overpayment when QuickBooks calculates a different tax amount than expected.

  • Sales channel order includes tax at the line level, but QuickBooks expects it summarized.

Step-by-Step Instructions

1. Review Sales Tax Posting Method

  • Navigate to:
    Connections > Accounting/POS/ERP > Sync Settings > Sales Tax 

  • Look for the section labeled Configure your sales tax.

  • If the setting is currently set to Let QuickBooks Calculate, please update this setting.

2. Change the Sales Tax Posting Method

  • Select the option "Record sales tax calculated from the sales channel as a line item in QuickBooks", and from the dropdown, choose a specific line item instead of selecting "Let QuickBooks Calculate".

  • Click Save to apply the new configuration.

3. Reattempt Order Posting

  • Go to the order that previously failed.

  • Click Post to QuickBooks again.

  • Confirm that the payment is applied without triggering the error.

4. Validate the Order Details

  • Open the posted transaction in QuickBooks.

  • Confirm:

    • Each line item reflects the correct tax.

    • The total amount matches the order total in the sales channel.

Notes

  • This fix applies specifically to environments where Webgility Desktop is integrated with QuickBooks Desktop.

  • If tax values frequently mismatch, review your tax setup in both your sales channel and QuickBooks for alignment.