Invoice is not paid and the address is unknown: next steps

This article explains invoice is not paid and the address is unknown: next steps in the context of German receivables management. It is written for companies, self-employed professionals, accounts receivable teams and creditors that need a clear, documented next step. Fortis Inkasso GmbH & Co. KG can support professional debt collection processes; the article does not replace case-specific legal advice.
Starting point: Next steps
When an invoice is not settled as agreed, the first week shapes everything that follows. The focus of this article is one specific point: Next steps. A structured approach here noticeably shortens the time amounts stay open and creates the basis for any later escalation. Small improvements here work through the entire receivables portfolio.
The first few days decide whether a case runs as routine or as a special exception. A clear initial assessment keeps it in the routine. For recurring services, a consistent invoice structure prevents queries from arising in the first place. A fixed cycle is more effective than a review that only happens when someone asks for it.
Requirements and documents
Evidence is the currency in any dispute. What is needed: the contract or order confirmation, the invoice with number and date, proof of delivery or acceptance, the correspondence on the case and a statement of all payments received so far. This care costs minutes and saves days if the matter is ever disputed.
Correct master data matters just as much: full company name, legal form, register number and a deliverable address. Even small discrepancies lead to queries later, or to a payment order that cannot be served. When an invoice stays unpaid, proof of delivery and of the invoice content is the first point to be checked. In concrete terms this comes back to one point: Next steps.
Step-by-step approach
The approach follows the calendar rather than instinct. Day one after the due date: check incoming payments. Days three to five: friendly reminder. Days ten to fourteen: formal reminder with a final period. After that period: decide on escalation. A short note in the system replaces any later reconstruction from memory.
Under German law default occurs at the latest 30 days after the due date and receipt of the invoice, though against consumers only if that consequence was pointed out. From that point default interest can be charged. Unpaid invoices often have a formal cause: a missing purchase order number, the wrong recipient or an unclear description of services. What is prepared properly at this stage shortens every subsequent step.
Common mistakes and risks
The common sources of error are quickly named: reacting too late, undocumented agreements, instalment plans without written confirmation, and assuming a phone call replaces a formal reminder. None of these is legally complex; all of them cost time. What counts is less the perfect solution than one that is actually applied day to day.
The limitation period is often underestimated as well: the standard period is three years and starts at the end of the year in which the claim arose. Overlooking it means losing enforceable claims for no reason. The more precisely an invoice describes the service delivered, the harder it is to delay payment with follow-up questions. The link to the subject of this article is direct: Next steps.
When Fortis can be involved
Not every case belongs outside the company immediately. Handover is sensible when deadlines and contact attempts are exhausted, the amount justifies the effort and the documents are complete. Fortis Inkasso operates as a registered collection service provider. The earlier this point is clarified, the less time enforcement costs later.
Cooperation can be limited to individual cases or set up as an ongoing process. Which variant fits depends on volume and on internal capacity. A brief confirmation of receipt from the customer saves a great deal of later discussion. The effort is one-off; the benefit repeats with every case.


