Types of invoices - full list with use cases

• Cash flow challenge: I know there are different types of invoices, but I’m not sure which one I should be using for my business. I don’t want to risk payment delays by sending the wrong format to customers.

• Perfect for: Small business owners, freelancers, and finance teams who want to issue the right invoice for every situation.

Novuna helps businesses understand which type of invoice fits their needs, making sure customers receive clear, accurate documents that speed up payments. Whether you’re issuing pro forma invoices, final invoices, or credit notes, we can guide you through the options and connect you with funding if cash flow gaps remain.

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Understanding invoice types

Invoices are more than just requests for payment. Depending on the stage of work, the customer relationship, or the type of sale, a different format may be required. Using the right invoice helps set expectations, keeps your accounts accurate, and ensures payments are not delayed.

Common types of invoices and when to use them

Pro forma invoice

Issued before goods or services are delivered, usually as an estimate or confirmation of intent. Helps customers understand the cost upfront before committing.

Final invoice

Sent once work is complete or goods are delivered. Includes all costs, agreed terms, and payment instructions. This is the standard invoice most businesses use.

Interim or progress invoice

Used for longer projects, especially in construction or consultancy. Breaks payments into stages so cash flow is steadier throughout the project.

Recurring invoice

Ideal for subscription services, retainers, or ongoing contracts. Automates billing so payments are consistent each month.

Credit note

Issued when a business needs to correct an error on an invoice or provide a refund. Ensures accounts remain accurate.

Debit note

Raised by a buyer to formally request a refund or adjustment when goods or services do not match the original agreement.

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Commercial invoice

Used in international trade to provide customs details, product descriptions, and declared values.

Timesheet invoice

For freelancers or contractors charging by the hour. Lists hours worked, rates, and total payable.

Retainer invoice

Requested upfront to secure ongoing services. Helps businesses manage cash flow by receiving part of the payment before work starts.

How Novuna Business Cash Flow helps

Choosing the right invoice type helps reduce disputes and payment delays, but even with clear paperwork, late payments still happen. Novuna helps businesses secure funding against outstanding invoices, so cash keeps flowing while customers catch up.