--- title: "Wrong tax amount on an invoice" slug: "update-the-tax-zone-of-an-invoice-recommended-workflow" tags: ["Area - Accounting Integrations", "Focus - Construction", "Focus - Service Replacement", "Role - Accountant", "Role - Admin", "Type - Commercial", "Type - Residential"] updated: 2026-08-24T20:47:09Z published: 2026-08-28T12:00:05Z canonical: "help.servicetitan.com/update-the-tax-zone-of-an-invoice-recommended-workflow" --- > ## Documentation Index > Fetch the complete documentation index at: https://help.servicetitan.com/llms.txt > Use this file to discover all available pages before exploring further. # Wrong tax amount on an invoice ![](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/anvil-wrench.png) Troubleshooting **Role:** Administrator · Bookkeeper · Office Admin**Area:** Accounting · Invoicing · Tax Zones · All versions ## **What you're seeing** An invoice shows a tax amount that doesn't match what you expect. The wrong tax zone is applied to the invoice or its location, so ServiceTitan calculates tax at the wrong rate. This can affect one invoice or every open invoice for a location. > [!NOTE] > **Note:** This article covers accounts that calculate tax using ServiceTitan tax zones. If your account uses the Avalara integration, tax zones aren't used and Avalara calculates the tax instead, so the checks below don't apply. See the [**Avalara integration guide**](https://help.servicetitan.com/docs/avalara-integration-guide). ## **Why this happens** There are 2 common reasons. **Reason 1** **The invoice is using the wrong tax zone.** This usually happens because the location's tax zone is incorrect or wasn't set. ServiceTitan calculates the tax field from the tax zone, so when the zone is wrong, the tax is wrong. The best fix is to correct the tax zone so ServiceTitan recalculates the right amount, rather than typing over the tax field by hand. **Reason 2** **A deactivated tax zone is still attached to the invoice.** A tax zone that has been deactivated can stay attached to an invoice even after its zip codes are removed and **Set Tax Zones** is applied. The invoice keeps calculating from the old zone, and the tax field may be locked. ## **Before you start** > [!NOTE] > **Caution:** For accurate tax-liability reporting, let ServiceTitan calculate the tax field. Don't manually overwrite the tax amount on an invoice. Correct the tax setup instead. - The **refresh** button that recalculates tax from the tax zone requires account configuration. Contact Technical Support for details. If you don't have it, use the alternative in Check 1, step 5. - The invoice must be in **Pending** status to edit the tax zone. If it's **Posted**, unpost it first. If it's **Exported**, see [**Edit invoices exported to QuickBooks Desktop**](https://help.servicetitan.com/docs/edit-invoices-exported-to-quickbooks-desktop). That workflow has its own prerequisites: the new ServiceTitan Web Connector to QuickBooks Desktop, account configuration, and the **Allow edit and update of previously exported transactions** permission. It does not apply to invoices generated from an Application for Payment. - If a payment is applied to the invoice, unapply it before you edit the tax field, then reapply it when you're done. ## **How to fix it** Run these checks in order. Most issues are resolved by Check 1. ### **1****Correct the tax zone on the invoice and recalculate** Use this to fix the invoice in front of you. Start here for a one-off wrong tax amount. 1. Make sure the invoice is in **Pending** status. If it's **Posted**, unpost it. 2. Click **Update Invoice Details**. ![Update Invoice Details button](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/update-the-tax-zone-of-an-invoice-recommended-workflow-image-iyed4pjj.png) 3. Click **Tax Zone**. ![Tax Zone field](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/update-the-tax-zone-of-an-invoice-recommended-workflow-image-lb7z86hc.png) 4. Select the correct tax zone from the dropdown. ![Tax zone dropdown](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/update-the-tax-zone-of-an-invoice-recommended-workflow-image-di6fr584.png) 5. On the invoice, click the **refresh** button next to the tax field to recalculate tax from the current tax zone. If your account doesn't have the refresh button, change the tax zone on the invoice, save, then change it back to the correct zone. This forces a recalculation. 6. Repeat steps 1 through 5 for each other open invoice for the location, and repost any invoices you unposted. > [!NOTE] > **✓ Done ·** The invoice shows the correct tax amount for the right tax zone. > [!NOTE] > **Note: Set Tax Zones** does not retroactively apply a tax zone to open invoices. You still need to correct each open invoice. ### **2****Fix the location's tax zone** Use this if the location keeps applying the wrong zone. 1. Update the tax zone on the location profile so future invoices default to the correct zone. See [**Set up sales tax in ServiceTitan**](https://help.servicetitan.com/docs/set-up-sales-tax-in-servicetitan). 2. Confirm new invoices for that location now calculate the expected tax. > [!NOTE] > **✓ Done ·** New invoices for the location default to the correct tax zone, so you don't have to fix them one at a time. ### **3****If the tax field is grayed out on a Pending invoice** Use this if the tax field can't be edited even though the invoice is Pending and the accounting period is open. 1. Check whether the tax zone previously applied to the invoice has been deactivated. A deactivated zone can stay attached to the invoice even after you remove its zip codes and click **Set Tax Zones**. 2. Unpost the invoice if it's **Posted**, then reopen it and try the **refresh** button again. 3. If the tax field is still locked, contact Technical Support. Correcting an invoice that's holding a deactivated tax zone may require a backend update. > [!NOTE] > **✓ Done ·** The tax field is editable and recalculates from the current tax zone. ## **Still not working?** Contact ServiceTitan Technical Support at [**go.servicetitan.com/ask**](https://go.servicetitan.com/ask) with: - The invoice number(s) and the location involved - The tax zone currently applied and the tax zone you expect - The invoice status (Pending, Posted, or Exported) - Whether the tax field is editable or grayed out - Whether the previously applied tax zone has been deactivated - Which checks from this article you already tried ## **Want to learn more?** [**Set up sales tax in ServiceTitan ›**](https://help.servicetitan.com/docs/set-up-sales-tax-in-servicetitan) Configure tax zones, rates, and agencies so invoices calculate the correct tax from the start. [**Set up QuickBooks Desktop for sales tax (US) ›**](https://help.servicetitan.com/docs/set-up-quickbooks-desktop-for-sales-tax-us) Map ServiceTitan tax zones to QuickBooks Desktop so US sales tax exports correctly. [**Set all customers to one default tax zone ›**](https://help.servicetitan.com/docs/set-all-customers-to-one-tax-zone-recommended-workflow) Apply a single tax zone across all customers when your business bills one rate. [**Invoice tax showing incorrectly or not removable ›**](https://help.servicetitan.com/docs/how-do-i-remove-tax-from-an-invoice) Troubleshoot invoices where the tax amount is wrong or the tax field won't clear. [**Edit invoices exported to QuickBooks Desktop ›**](https://help.servicetitan.com/docs/edit-invoices-exported-to-quickbooks-desktop) Prerequisites and steps for editing invoices that have already exported to QuickBooks Desktop.