---
article_id: KB0394063
article_type: FAQ
component_ids:
  - BNS-ARI-INV-IR-EXP
component_descriptions:
  - Invoicing > Invoice Reconciliation > Invoice Reconciliation Exceptions
products:
  - SAP Ariba Procurement, cloud edition
personas:
  - Admin
  - Buyer
language: en
created: 2026-08-27
updated: 2026-08-27
source: Knowledge Base
url: https://support.ariba.com/item/view/KB0394063
connect_url: https://support.ariba.com/item/view/KB0394063?min=1
sap_for_me_url: https://me.sap.com/notes/KB0394063
---

# How do I configure tolerances for the Under Tax Variance exception?

## Symptom

Most exceptions have tolerances that check for an invoice amount **greater than** the expected amount. The Under Tax Variance invoice exception catches amounts that are **less than** the expected amount. How should I configure these tolerances?

## Resolution

Configure the absolute and percentage tolerances with a minus sign (-) to have the system look for values **below** a certain value or percentage.

For example, to allow values up to 3% below the expected tax and/or up to $10 below the expected tax, configure the exception as follows:

- **Absolute Tolerance**: -10
- **Apply Absolute Tolerance To Difference**: Yes
- **Percentage Tolerance**: -0.97

On an invoice with $100 expected tax, the absolute tolerance is met if the tax is at least $90, and the percentage tolerance is met if the tax is at least $97.

## See Also

The Withholding Tax exceptions like **Withholding Tax - Over Tax Variance** and **Withholding Tax - Under Tax Variance** must have **Apply Absolute Tolerance to Difference** set to **No**, as per the standard configuration.

Refer to the topic [*About invoice types and conditions*](https://help.sap.com/docs/buying-invoicing/invoicing-data-import-and-administration-guide/about-invoice-exception-types-and-conditions?q=About%20invoice%20types%20and%20conditions&locale=en-US) in the *[Invoicing data import and administration guide](https://help.sap.com/docs/buying-invoicing/invoicing-data-import-and-administration-guide/invoicing-data-import-and-administration-guide?q=About%20invoice%20types%20and%20conditions&locale=en-US).*

## Keywords

WHT, under tax, tolerance, invoice exception, negative