# Invoice type code

Code indicating the document type (invoice, credit note, etc.).

## Definition

Code indicating the document type (invoice, credit note, etc.).

## Explanation

Used to distinguish invoices from credit notes and corrections.

Often validated against a code list (e.g., UNTDID/UNCL).

## Related resources

- [Invoice type codes](/resources/code-lists/invoice-type-codes)

## Related terms

- [Credit note](/resources/glossary/credit-note): Document that reduces or cancels a previously issued invoice amount.
- [Code list](/resources/glossary/code-list): A predefined set of allowed codes/values (e.g., VAT category, payment means).