Hi Laura,
It could be due to how Acumatica recalculates taxes based on the latest data at the time of conversion. This might involve updated tax rates, different rules applied to the document type, or discrepancies inline-level details (e.g., freight handling or item-specific taxes).
To solve this, verify if there are any differences between the Sales Quote and Sales Order in terms of freight handling or item grouping. Next, confirm that the tax zone and rates in Taxes (TX205000) are consistent and correctly set up. If no discrepancies are found, consider reviewing any customizations or automation steps applied during the quote-to-order conversion process, as they may override standard behavior.
Hope it helps