Outstanding debts against Dutch customers can be recovered in various ways.
First of all, there is the possibility of initiating a European order for payment procedure. In the European order for payment procedure, a number of forms and applications have to be completed and sent to the court in The Hague. The court then issues a European order for payment, giving the debtor 30 days to lodge an objection against this order for payment. If the debtor does not do so, the order for payment is declared enforceable and can be enforced with the help of a Dutch process server. In the event of an objection, the matter will be heard by the competent Dutch court.
As mentioned above, Dutch law also offers the option of conservatoir beslag, by which assets of your Dutch debtor can be frozen, enabling you to obtain payment very quickly.
In addition, there is the option of initiating debt collection proceedings in court. This is a normal court procedure in which the aim of the claim is to order the debtor to pay. Note that this is a regular court case. The Netherlands does not have a dunning procedure (Mahnverfahren) as Germany does. It may still be possible to obtain an advance payment for the arrears in kort geding proceedings.
As a last resort, under certain conditions, a petition for insolvency (faillissementsaanvraag) can also be filed against the debtor. This does require that the debtor is leaving multiple creditors unpaid. Provided the debtor can pay, they will usually do everything possible to avoid insolvency.