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The Retainer Invoice is a specialized billing document used in professional service relationships where services are provided on an ongoing basis under Austrian jurisdiction. It is typically employed when a client has engaged a service provider for regular, continuing services with a predetermined fee structure. This document type combines elements of both a standard invoice and a service agreement, ensuring compliance with Austrian tax regulations (particularly the Umsatzsteuergesetz) and invoicing requirements. The Retainer Invoice should be used when there is an established agreement for recurring services, and it must include all mandatory elements required by Austrian authorities, such as VAT details, company registration information, and specific payment terms. It serves as a crucial document for both accounting purposes and maintaining clear service delivery records.

1. Invoice Header: Company logo, invoice number, date, and document title ('Retainer Invoice'/'Dauerrechnung')

2. Supplier Details: Full legal name, address, tax ID number (UID), commercial register number, and contact information of the service provider

3. Client Details: Full name/company name, address, and VAT number (if applicable) of the client

4. Retainer Terms: Specification of the retainer period, payment frequency, and agreed service scope

5. Service Description: Detailed description of services covered under the retainer arrangement

6. Fee Structure: Clear breakdown of the retainer fee, including net amount, VAT rate and amount, and total gross amount

7. Payment Terms: Payment due date, payment method, and bank account details

8. Legal Notices: Mandatory legal information including jurisdiction and applicable VAT regulations