# Why is tax missing from this customer's invoice?

Check the saved customer exemption and the tax selections on invoice lines.

Canonical: https://demo.qixcount.com/help/faq/customer-exemption

QixCount skips invoice tax when the customer's saved exemption is on and passes its expiry check. A blank expiry is treated as no expiry. Also check each invoice line's tax selection; a line without a selected rate may have no calculated tax. This describes the software calculation, not whether an exemption applies to the sale. Read [Exemption certificates](https://demo.qixcount.com/help/taxes/exemption-certificates) and [Apply tax on invoice lines](https://demo.qixcount.com/help/taxes/apply-tax-on-invoices).