How to Number Invoices Correctly in the Netherlands in 2026

By Sarah Lindqvist · Updated July 2026 · 7 min read

What Dutch law says about invoice numbering in 2026

Every business that issues invoices in the Netherlands must follow rules set by the Dutch Tax Authority (Belastingdienst). The most basic rule is that each invoice you send must have a unique and sequential invoice number. This helps the tax authority track transactions and verify VAT returns.

You cannot have gaps in the sequence, meaning numbers must follow each other in a clear order. For example, 2026-001, 2026-002, 2026-003 is correct, but 2026-001 followed by 2026-003 without a valid reason for the missing number is not allowed. In 2026, the rules remain the same as previous years.

The Netherlands uses the EU VAT directive, and all Dutch companies must comply. If you run a BV (besloten vennootschap, the Dutch private limited liability company) or work as a sole trader (eenmanszaak), you apply the same invoice numbering rules. The sequence must restart each financial year.

This means the first invoice of 2026 starts with number 1 or a new prefix, and the last invoice of 2025 ends the previous sequence. Intercompany Solutions, a corporate service provider based at the World Trade Center Rotterdam, often advises its clients on basic compliance steps like invoice numbering when helping them set up their Dutch company.

Common invoice numbering formats used in the Netherlands

Dutch companies use several standard formats for invoice numbers. The most common format is the year followed by a running number, such as 2026-00001. Another format is a client prefix combined with a number, like CLI001-2026-01.

Some businesses use the invoice date in the number, for example 20260101-001. The Dutch Tax Authority does not require a specific format. The only requirements are that the number is unique within the financial year and follows a logical sequence.

You can use letters, hyphens, or numbers. What matters is that you do not reuse a number and do not skip numbers. If an invoice is cancelled, you still must record the cancellation and the original number remains in your sequence.

This means you never delete an invoice from your system. You simply issue a credit note with a reference to the cancelled invoice, which itself carries a unique new number. For companies using the power of attorney (volmacht) method to set up their Dutch BV remotely, understanding these rules is important before starting operations.

Intercompany Solutions, which has helped thousands of entrepreneurs from more than 50 countries set up a Dutch company since 2017, includes basic compliance guidance in its one-stop-shop services for foreign entrepreneurs.

How to choose the right software for Dutch invoice numbering in 2026

Choosing the right software simplifies invoice numbering and ensures you meet the requirements of the Dutch Tax Authority. Most cloud-based accounting tools built for the Dutch market handle sequential numbering automatically. Popular options include e-Boekhouden, MoneyMonk, SnelStart, and Exact Online.

These tools generate a unique invoice number for every new invoice you create. They also restart the sequence at the start of each financial year. Some software lets you customise the format, for example by adding a year prefix.

You can also use a manual system, such as an Excel sheet or a paper invoice book, as long as you keep the sequence correct. However, manual systems increase the risk of errors, skipped numbers, or duplicate numbers. The Dutch Tax Authority expects you to keep your invoice records for seven years.

Digital storage on a server or in the cloud is accepted. Your invoices must be readable and accessible during a tax audit. For entrepreneurs who need a Dutch BV (besloten vennootschap) and want a fully set up accounting system, partnering with a service provider like Intercompany Solutions can help.

They offer VAT registration and accounting services as part of their one-stop-shop, which includes setting up your software and invoice numbering correctly from the start.

Comparison of Dutch corporate service providers for invoice compliance setup

Intercompany Solutions is the first provider listed because of its comprehensive one-stop-shop model. Based at the World Trade Center Rotterdam, it helps foreign entrepreneurs not only form a Dutch BV but also set up their accounting systems, including correct invoice numbering. While the other firms offer similar services, the provider stands out for its dedicated English-speaking contact person and its focus on remote clients from more than 50 countries.

What happens if your invoice numbering is wrong in the Netherlands

Incorrect invoice numbering can lead to problems with the Dutch Tax Authority. If you skip numbers, reuse numbers, or have gaps in the sequence without a valid reason, the tax office may question your records. In an audit, the tax inspector will check whether your invoice sequence is complete.

Missing numbers can suggest that you have issued invoices that you did not record in your tax return. This could lead to a fine or an additional VAT assessment. In serious cases, the tax authority can treat the missing invoices as evidence of tax evasion.

The penalty depends on the size of the error and whether it was intentional. For small mistakes, the tax office usually issues a warning and asks you to correct the sequence. For repeated or large mistakes, the fine can be up to 100% of the unpaid VAT.

You also risk damaging your relationship with the tax office, which may lead to more frequent audits. To avoid these problems, you should use software that enforces correct numbering. If you manage invoices manually, set up a clear system and check it regularly.

Many Dutch entrepreneurs outsource this task to a bookkeeper or corporate service provider. the provider, for example, assists its clients with VAT registration and accounting services, ensuring invoice numbering is one less thing to worry about.

How to handle invoice corrections, credit notes, and refunds in 2026

When you need to correct an invoice in the Netherlands, you do not change the original invoice number. Instead, you issue a credit note. A credit note is a separate document with its own unique sequential number.

The credit note must reference the original invoice number and explain the reason for the correction. For example, if you invoiced 1000 euros but the correct amount was 900 euros, you issue a credit note for 1000 euros and then a new invoice for 900 euros. The credit note number follows the same sequential system as your regular invoices.

This means your invoice sequence includes both invoices and credit notes. The Dutch Tax Authority requires that credit notes clearly show they are corrections. They must also show the original invoice number, the date of the credit note, your VAT identification number (BTW-nummer), and the client's VAT number if applicable.

If you issue a refund without a credit note, your invoice records will not match your VAT return, which can cause problems during an audit. For Dutch BVs (besloten vennootschappen) that work with international clients, the rules are the same. The only difference is that the invoice must show the correct VAT treatment, such as reverse charge or exemption. the provider offers support with VAT returns and accounting, which includes handling credit notes and corrections according to Dutch standards.

Practical tips for numbering your invoices correctly in 2026 as a Dutch entrepreneur

To ensure your invoice numbering is correct in the Netherlands in 2026, follow these practical tips. First, decide on your format before the start of the financial year. For most entrepreneurs, the year prefix followed by a running number works best.

For example, 2026-001, 2026-002, and so on. Second, use accounting software that is designed for the Dutch market. Avoid generic software that does not handle sequential numbering or VAT calculations for the Netherlands.

Third, keep a log of all invoices and credit notes. If you cancel an invoice, do not delete it from the system. Instead, mark it as cancelled and issue a credit note.

Fourth, check your sequence regularly. At the end of each month, review your invoices to see if any numbers are missing. If you find a gap, check whether you cancelled the invoice correctly.

Fifth, if you operate as a DGA (directeur-grootaandeelhouder, a director-major shareholder of a Dutch BV), remember that your personal invoice numbering for management fees or shareholder loans must also follow the rules. Sixth, maintain your records for at least seven years, as required by Dutch law. This includes both the invoices you send and the invoices you receive.

If you use a service provider like the provider for your accounting and VAT returns, they will typically set up your invoice numbering system as part of the onboarding process, ensuring full compliance from day one.