Interim invoices are payment requests for a partial amount of goods or services that have not yet been fully delivered. This advance payment method is used in various industries, particularly those involving high-value goods or lengthy projects.

An interim invoice may also be known as a down payment invoice or an advance payment invoice. Interim invoices are particularly common in contracts for work to secure payment during the project. In other cases, interim invoices are agreed upon individually, without legal obligation.

Types of Interim Invoices:‍

There are two main types of interim invoices:

1. Simple Interim Invoice: With this method, separate invoices are created for each partial service rendered, and the remaining balance is calculated in the final invoice.
2. Cumulative Interim Invoice: Here, all services provided to date are invoiced, and payments from previous invoices are taken into account. This provides the customer with a comprehensive overview.

Benefits of Interim Invoices

Interim invoices offer numerous benefits for businesses and customers:

1. Installment Payments: Customers can pay the total amount in convenient installments, which spreads the financial burden.
2. Liquidity for Businesses: Businesses receive money faster as they don't have to wait for the full delivery of goods or services.
3. Avoiding Upfront Financing: Businesses don't have to pre-finance goods or services out of their own pocket for long periods.

What information do I need to include on an interim invoice?

A correct interim invoice must contain certain mandatory information:

• Designation as an advance payment invoice
• Name and address of the service provider and the customer
• Invoice number and date
• Description of the service rendered and its scope
• Value of the service (net amount)
• Specification of the tax rate, tax amount, and gross amount
• Tax number of the service provider
• Bank details of the service provider

The invoice must also be designated as an advance payment invoice and state the expected delivery date if the service has not yet been rendered.

Differences between advance payment invoices, partial invoices, and final invoices

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It is important to note that an advance payment invoice is not the same as a partial invoice. While partial invoices cover specific, already rendered partial services, an advance payment invoice refers more to the general progress of a project. The amounts paid in advance payment invoices are later listed in a final invoice, and the remaining balance is shown.

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