Website v20.0.43 - 01 April 2026
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This patch fixes a tax calculation error for stores using Avalara where applying a promotion, cash rounding adjustment, or tip caused the order’s tax total to be lower than expected.
Breaking changes and cautions
No breaking changes in this release.
Enhancements
No enhancements in this release.
Deprecated fields
No fields have been formally deprecated in this release.
Fixed bugs
Avalara calculating incorrect tax totals when promotions, cash rounding, or tipping are applied [WEB-7931] When Avalara is used for tax calculation and an order includes a promotion, cash rounding adjustment, or tip, the tax total was being understated. For example, a product with 7.25% tax on a $1,822.36 order was returning $112.31 in tax instead of the correct $132.12.
The cause was that the promotional and adjustment line items (promotion discount, cash rounding, tipping) were being sent to Avalara as part of the tax calculation request. Avalara interpreted these as additional discount adjustments and applied a second round of tax offsets on top of the discount already accounted for in the promotion line — effectively removing some tax twice. These adjustment products are now excluded from the Avalara tax calculation, and only the actual purchasable items are sent. Tax totals on affected orders will now be correct.