Troubleshooting
Role: Administrator · Bookkeeper · Office AdminArea: 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.
Why this happens
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.
Before you start
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.
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. 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.
1Correct the tax zone on the invoice and recalculate
Make sure the invoice is in Pending status. If it's Posted, unpost it.
Click Update Invoice Details.
Click Tax Zone.
Select the correct tax zone from the dropdown.
On the invoice, click the refresh button next to the tax field to recalculate tax from the current tax zone.
Repeat steps 1 through 5 for each other open invoice for the location, and repost any invoices you unposted.
✓ Done · The invoice shows the correct tax amount for the right tax zone.
Note: You can also change the tax zone on the invoice, save, then change it back to the original. This forces a recalculation. Set Tax Zones does not retroactively apply a tax zone to open invoices.
2Fix the location's tax zone
Use this if the location keeps applying the wrong zone.
Update the tax zone on the location profile so future invoices default to the correct zone. See Set up sales tax in ServiceTitan.
Confirm new invoices for that location now calculate the expected tax.
✓ Done · New invoices for the location default to the correct tax zone, so you don't have to fix them one at a time.
3If the tax field is grayed out on a Pending invoice [PROPOSED, SME sign-off needed]
Use this if the tax field can't be edited even though the invoice is Pending and the accounting period is open.
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.
Unpost the invoice if it's Posted, then reopen it and try the refresh button again.
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.
✓ 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 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 ›
Configure tax zones, rates, and agencies so invoices calculate the correct tax from the start.
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 ›
Apply a single tax zone across all customers when your business bills one rate.
Invoice tax showing incorrectly or not removable ›
Troubleshoot invoices where the tax amount is wrong or the tax field won't clear.
Edit invoices exported to QuickBooks Desktop ›
Prerequisites and steps for editing invoices that have already exported to QuickBooks Desktop.