A set of parameters that define the default control indicator in a sales or purchasing document line.
Tax code determination in SAP Business One can be customised by defining rules. These rules determine which tax code is used in a document based on various criteria such as item groupscountries or certain transaction types.
You can find the tax code determination rules at Administration > Definition > finance > Tax > Tax code determination.

Functionality of the tax code determination:
- You can define several rules for tax code determination.
- The rules are applied in order of priority.
- If a rule applies, the control indicator defined in the rule is used.
- If none of the defined rules apply, the standard tax code determination sequence is used.
Example of a tax code determination rule:
- Criterion: Article group = "Food"
- Tax code: V1 (7% VAT)
This rule would result in the tax code V1 (7% VAT) being used automatically in all documents containing articles from the article group "Food".
Advantages of tax code determination:
- Automation: The tax codes are determined automatically based on the defined rules, which reduces manual effort and avoids errors.
- Flexibility: You can customise the tax code determination to the specific requirements of your company.
- Consistency: The use of the correct tax codes is ensured, resulting in consistent tax calculation and posting.
Important notes:
- Tax code determination rules should be defined carefully and in consultation with the tax consultant.
- The rules should be reviewed regularly and adjusted if necessary to ensure that they comply with current tax regulations.
- The tax code determination can also be used in conjunction with the DATEV export. In this case, the tax codes must be entered with the corresponding DATEV-posting keys can be mapped.
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