Invoicing requirements according to German law
Valid invoicing is an important precondition for debt collection in Germany. According to German civil law an invoice with a clear statement of the date when the amount is due is absolutely sufficient and should have been issued by the creditor before contacting the law office.
Only in this case the creditor has a right to get his legal costs reimbursed by the debtor.
Unless otherwise agreed an invoice automatically falls due for payment no later than 30 days after receipt.
Notice of default and respective evidence for notification needed
It is absolutely necessary to send a notice of default to the creditor. The documents can be sent by fax or postal service if there is clear evidence for transmission. Due to evidence reasons this document should be delivered by hand or by post with a registered letter.