Help centre

Clear, free guides on invoices, quotes, VAT and invoicing best practices. If you have questions about how to invoice correctly, start here.

Basic concepts

What is an invoice

Find out what an invoice is, what it's for, how it differs from a quote or a receipt, and what information it must always include.

What is a quote

Find out what a quote is, how it differs from an invoice, how long it should stay valid, and what information it must include.

What is a proforma invoice

Find out what a proforma invoice is, how it differs from a regular invoice, and when it makes sense to issue one.

What is a receipt

Find out what a receipt is, when it's used, what information it should include, and how it differs from an invoice.

What is a delivery note

Find out what a delivery note is, what information it should include, and how it relates to the invoice in a sale.

Differences between invoice, quote, receipt and delivery note

A clear comparison of invoices, quotes, receipts and delivery notes: what they are, when each is used, and where they fit in the sales process.

Step-by-step guides

How to make an invoice step by step

A practical guide to making an invoice correctly: what information you need, how to calculate VAT and how to send it to your client.

How to make a quote step by step

Learn how to make a professional quote in minutes: what information to include, how to set its validity, and how to present it to your client.

How to calculate VAT on an invoice

Learn how to calculate VAT step by step, with the formula, common rates and practical examples.

How to number invoices correctly

Basic rules for numbering your invoices correctly and avoiding issues with tax authorities: series, sequencing and best practices.

What information must an invoice include

A complete list of the mandatory and recommended details an invoice should include to be valid.

Common invoicing mistakes

The most frequent invoicing mistakes and how to avoid them: numbering, VAT, incomplete details and more.

Invoice types

Invoices for freelancers

A guide for freelancers on how to invoice correctly: tax details, VAT, withholding tax and a practical example.

Invoice with VAT

How to issue an invoice with VAT correctly: calculation, applicable rates and a step-by-step example.

Invoice without VAT

Find out when an invoice can be issued without VAT, what note it must include, and how to do it correctly.

Corrective invoice

Find out what a corrective invoice is, when you need to issue one, and what information it should include.

Simplified invoice

Find out what a simplified invoice is, how it differs from a regular invoice, and when it can be used.

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