BT-73

Invoicing period start date

BT-73 (Invoicing period start date) is a business term of EN 16931, the European e-invoicing standard. This page shows where the field lives in a UBL invoice, how often it may appear and which validation rules check it.

Start of the period the invoice covers.

Group: BG-14 (Invoicing period)

Cardinality: 0..1

UBL element: cac:InvoicePeriod/cbc:StartDate

Example value: 2026-07-01

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