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Calculate Late Payment Fees

Calculate late fees on overdue invoices. Daily, monthly, and total penalties by amount and terms.

📅 Updated April 2026 Formula verified 📖 4 min read 🆓 Free · No sign-up

Gesetzliche Regelung

Verzugszins B2B: Basiszins + 9% (aktuell ~12,5%). B2C: Basiszins + 5% (~8,5%). Pauschale B2B: 40 € pro Rechnung (§ 288 Abs. 5 BGB). Mahnung: nicht mehr zwingend noetig — Verzug tritt 30 Tage nach Faelligkeit automatisch ein (wenn Rechnung Datum und Faelligkeit enthaelt).

Mahnverfahren

1. Mahnung (freundlich). 2. Mahnung (bestimmt). 3. Letzte Mahnung + Fristsetzung. Gerichtliches Mahnverfahren: Online ueber mahngerichte.de (23 € Gebuehr bis 1.000 €). Inkasso als Alternative: 10-25% Provision aber weniger Aufwand.

⚡ CalcWolf Insight

The average small business has $84,000 in unpaid invoices at any given time. Offering a 2% discount for payment within 10 days (common terms: "2/10 Net 30") costs you 2% but eliminates 30-60 days of cash flow delay. For businesses with tight cash flow, the discount pays for itself through reduced borrowing costs.

Frequently asked questions
Wie hoch sind Verzugszinsen?
B2B: Basiszins + 9%. B2C: Basiszins + 5%. Plus 40 € Pauschale (B2B).
Wann ist ein Kunde im Verzug?
30 Tage nach Faelligkeit automatisch (wenn Rechnung Datum + Faelligkeit enthaelt). Sonst: nach Mahnung.
✓ Math logic verified against primary sources → See our verification process
Kevin Glover
Founder, CalcWolf · GLVTS · Blickr
All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →
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