Different tax ID after copy-pasting invoice

When you copy-paste an invoice on the Invoice form (AR301000), the tax ID is not copied from the original invoice.

Instead, tax is recalculated on the new invoice using settings on the Customers form (AR303000).

MYOB Acumatica has been purposefully designed to do this, so that it always uses the most up-to-date tax configuration and avoids using outdated or non-compliant tax IDs from older invoices.