Fix Netsuite Tax Discrepancy

Our Netsuite instance needs immediate attention. On one recent sales order the Vertex tax pop-up shows $13.75 while the order summary records $11.64. I have attached the screenshot so you can see the exact mismatch.

I want a seasoned Netsuite professional who understands both Vertex and native tax calculation rules to dig into this order, explain why the numbers diverge, and recommend a clear remedy. Accurate tax reporting is my top priority, and any solution must preserve compliance while preventing future sales-order discrepancies.

Key objectives
• Analyse the specific tax lines, Vertex settings, and any custom scripts or workflows affecting the order.
• Identify whether the issue lies in tax codes, rounding, address validation, or script overrides.
• Propose and document a fix I can implement right away, along with any follow-up configuration steps to avoid repetition.

Please be ready to start ASAP; the sooner this is resolved the better. Attach a concise report summarising findings, root cause, and step-by-step corrective actions when you deliver.