C_TS4FI Financial Accounting Practice Question
A financial accountant is analyzing a vendor invoice that was posted with a withholding tax code. The tax code is configured with a reduced tax rate for vendors who provided a valid exemption certificate. After posting, the accountant notices that the withholding tax amount calculated is incorrect. Which factor most likely caused the incorrect calculation?
⚠ Common exam trap
The trap here is assuming that missing exemption certificate data automatically changes the tax rate, when in fact the tax code drives the rate and the certificate is supplementary.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The withholding tax base amount was manually changed during invoice entry.
The withholding tax base amount is a key field that can be manually altered during invoice posting. If the accountant or user changes it inadvertently, the system calculates withholding tax on the modified base, resulting in an incorrect amount. Other factors like vendor master data, company code configuration, and payment terms do not directly cause an isolated incorrect calculation for a single invoice when the tax code is correctly applied.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The payment terms in the invoice were set to immediate payment, triggering a different tax rate.
Why it's wrong here
Payment terms do not influence withholding tax rates. Withholding tax is based on the vendor's tax status and the tax code, not on when the payment is due. The payment terms affect cash discount and due date calculations, but they have no direct impact on the withholding tax amount. Therefore, this factor is irrelevant to the incorrect tax calculation.
- ✓
The withholding tax base amount was manually changed during invoice entry.
Why this is correct
The withholding tax base amount can be manually adjusted in the invoice, and if it is changed incorrectly, the withholding tax will be calculated on the wrong base, leading to an incorrect amount. The system uses the base amount to apply the tax rate; any manual override directly impacts the calculated tax. This is a common cause of discrepancies in withholding tax postings.
- ✗
The vendor master record was not updated with the exemption certificate number.
Why it's wrong here
While the exemption certificate number is important for determining the applicable withholding tax rate, its absence alone does not cause an incorrect calculation if the tax code already specifies the reduced rate. The tax code drives the rate, and the certificate number is for reporting and validation. Thus, missing certificate number would not directly change the calculated amount, though it may cause compliance issues.
- ✗
The company code's withholding tax configuration was set to calculate tax on net amount instead of gross amount.
Why it's wrong here
The withholding tax calculation base (net or gross) is typically determined by the withholding tax type and the tax code configuration. If the configuration were set incorrectly, it would affect all invoices using that tax code, not just this one. The scenario implies an isolated incorrect calculation, so a global configuration error is less likely. Moreover, changing this setting requires careful analysis and is not a common cause for a single invoice error.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official SAP exam blueprint
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