Purpose
The contractual penalty serves two functions at once: it exerts pressure to perform and facilitates damages liquidation without individual proof. Both make it vulnerable to challenge in standard terms and conditions. This skill reviews forfeiture, amount and validity of a contractual penalty clause and provides clause modules that withstand content review — including the discretionary penalty under Hamburg custom, which is the standard route in cease-and-desist declarations.
Inputs
- Contract type and party roles (B2C, B2B, mutual commercial transaction)
- Secured obligation: completion date, non-compete, confidentiality, cease-and-desist, acceptance obligation
- Clause wording (trigger, amount, cap, fault requirement, set-off rule)
- Pre-formulated (standard terms and conditions, §§ 305 ff. BGB) or individually negotiated (§ 305(1) sentence 3 BGB)
- If a breach has already occurred: date, duration, number of breaches, fault, damage incurred
- Was performance accepted? Was the reservation under § 341(3) BGB declared?
Sub-agent architecture
- Researcher (
../../agents/researcher.md) provides the statutes with URL, the standards under standard terms law and commentary references on reasonableness limits. - Drafter (
../../agents/drafter.md) reviews validity → forfeiture → reservation → amount → reduction and drafts the clause or the demand for payment. - Reviewer (
../../agents/reviewer.md) reviews standard terms review, caps, fault requirement and the reservation upon acceptance.
Process
1. Forfeiture of the contractual penalty (§ 339 BGB)
If the debtor promises the creditor, for the case that he does not or not properly perform his obligation, the payment of a sum of money as a penalty, the penalty is forfeited if he falls into default. If the owed performance consists in an omission, forfeiture occurs upon infringement (§ 339 sentence 2 BGB).
It follows for obligations to act: default is a prerequisite — i.e. due date, reminder or dispensability (§ 286 BGB) and attributable fault (§ 286(4) BGB). A contractual penalty independent of fault is invalid in standard terms under § 307 BGB. Details on the onset of default: /vertragsrecht:verzug-mahnung.
2. Penalty for non-performance (§ 340 BGB)
If the debtor has promised the penalty for the case that he does not performhis obligation, the creditor may demand the forfeited penalty instead of performance ; if he declares to the debtor that he demands the penalty, the claim to performance is excluded. If the creditor has a claim for damages for non-performance to, he can demand the forfeited penalty as minimum amount of the damage; the assertion of further damage is not excluded.
3. Penalty for improper performance (§ 341 BGB)
The practically most important case — delay or poor performance. The creditor can demand the forfeited penalty alongside performance . Here too the penalty is deemed the minimum amount of the damage (§ 341 para. 2 in conjunction with § 340 para. 2 BGB).
🔴 Reservation upon acceptance (§ 341 para. 3 BGB): If the creditor accepts performance, he can demand the penalty only if he reserves the right to do so upon acceptance. Anyone who accepts late construction work without reservation loses the contractual penalty permanently — this point is the most common loss of claim in practice. The reservation must be expressly included in the acceptance report .
4. Reduction by the court (§ 343 BGB)
If a forfeited penalty is disproportionately high, it can be reduced to the appropriate amount by judgment upon the debtor's application. In the assessment, every legitimate interest of the creditor, not merely the financial interest, must be taken into account. After payment of the penalty, reduction is excluded (§ 343 para. 1 sentence 3 BGB) — the debtor should therefore pay only under reservation .
Exclusion for merchants (§ 348 HGB): A contractual penalty that has been promised by a merchant in the operation of his commercial business can not be reduced on the basis of § 343 BGB. The commercial debtor is thus referred to the general limits: standard terms review under §§ 307 et seq. BGB and immorality under § 138 BGB. Precisely for this reason, the dispute in B2B shifts entirely to the validity of the clause.
5. Standard terms review (§ 309 no. 6 BGB)
Prohibition of clauses without any possibility of assessment: In standard terms, a provision is invalid by which the user is promised payment of a contractual penalty for the case of non-acceptance or late acceptance of the performance, of default in payment , or for the case that the other contracting party withdraws from the contract.
In B2B § 309 no. 6 BGB does not apply directly, but has indicative effect via § 310 para. 1 sentence 2 BGB. In addition, § 307 BGB always reviews:
| Review point | Requirement |
|---|---|
| Fault | Clause must presuppose attributable conduct; penalty independent of fault is invalid |
| Upper limit | For construction contracts, an overall cap on the delay-related contractual penalty is required; a value of around 5% of the contract sum is widely cited as the limit [unverifiziert – prüfen] |
| daily rate | Delay penalties per working day must remain reasonable in amount; daily rates significantly above 0.2–0.3% of the contract sum are considered vulnerable [unverifiziert – prüfen] |
| Offsetting | Offsetting against damages must be preserved (Section 340(2) of the German Civil Code) |
| Transparency | Trigger, calculation basis and upper limit must be clearly specified (Section 307(1) sentence 2 of the German Civil Code) |
No severability reducing the clause to a permissible content: An excessive contractual penalty clause in standard terms and conditions is not reduced to the permissible level, but falls away entirely (Section 306(2) of the German Civil Code). The user is then left without any contractual penalty — unlike in an individually negotiated contract, where Section 343 of the German Civil Code only reduces it. Details: /vertragsrecht:agb-kontrolle.
Clause module for delay-related contractual penalty (B2B, contract for work and services):
“If the contractor exceeds the agreed completion date for a reason for which it is responsible, it owes a contractual penalty in the amount of 0.2% of the net contract sum per working day of the excess, but in total no more than 5% of the net contract sum. The contractual penalty is offsetagainst any claim for damages by the client due to the delay. The client expressly reserves the right to assert the contractual penalty upon acceptance (Section 341(3) of the German Civil Code).”
Negative example and redraft:
| Invalid version | Defect | Redraft |
|---|---|---|
| “If the deadline is exceeded, the contractor pays 1% of the contract sum per calendar day.” | No fault, no upper limit, calendar days instead of working days, daily rate excessive | “…per working day of the excess for which it is responsible 0.2%, in total no more than 5%…" |
| “The contractual penalty is owed in addition to damages.” | Offsetting under Section 340(2) of the German Civil Code excluded | “The contractual penalty is offset." |
| “If the contract is terminated, the customer owes a contractual penalty of 20% of the contract value.” | Infringement of Section 309 No. 6 of the German Civil Code (B2C) | Delete entirely; instead use a lump-sum damages clause under Section 309 No. 5 of the German Civil Code with reservation of rebuttal evidence |
6. Hamburg custom — contractual penalty at equitable discretion
In penalty-backed cease-and-desist declarations , the contractual penalty is regularly not quantified, but instead structured according to Hamburg custom : The amount is determined by the creditor in the individual case at equitable discretion (Section 315 of the German Civil Code); its appropriateness is fully reviewable in the event of a dispute by the court (Section 315(3) BGB).
Advantages: The clause avoids the dispute over a penalty quantified in advance as too high or too low and is therefore less exposed to standard terms review. It simultaneously eliminates for the debtor the risk that a fixed penalty applies in the case of a trivial breach.
Clause building block "Hamburger Brauch":
"The debtor undertakes, under penalty of a contractual penalty payable for each case of contravention, the amount of which is determined by the creditor at his reasonable discretion and the appropriateness of which is to be reviewed by the competent court in the event of a dispute Contractual penalty, the amount of which the creditor determines at reasonable discretion and the appropriateness of which must be reviewed by the competent court in the event of a dispute, to refrain from [specific act]."
In addition, it must be provided whether multiple violations are to be summarized as a single contravention ("continuing connection") — without such a provision, the penalty can multiply in the case of continuing acts.
7. Delimitation and accompanying provisions
- Lump-sum damages are not a contractual penalty: They merely replace proof of the amount of damage and do not exert pressure to perform. In standard terms, Section 309 No. 5 BGB requires that the lump sum not exceed the ordinary course of damage and that the other party be expressly permitted to prove lesser damage. If this proviso is missing, the clause is invalid.
- Invalid penalty promise (Section 344 BGB): If the promised performance is invalid, the penalty promise is also invalid — the contractual penalty cannot secure a void primary obligation.
- Burden of proof (Section 345 BGB): If the debtor contests the incurrence of the penalty on the ground that he has fulfilled his obligation, then he must prove performance, unless the obligation owed consists in an omission.
- Performance other than a penalty (Section 342 BGB): A performance not consisting of money can also be a contractual penalty.
Sources
Statutes
- Section 339 BGB, Section 340 BGB, Section 341 BGB, Section 343 BGB, Section 344 BGB, Section 345 BGB
- Section 307 BGB, Section 309 BGB (No. 5, No. 6), Section 315 BGB, Section 286 BGB
- Section 348 HGB
Commentaries
- Grüneberg, BGB, 83rd ed. 2024, Sections 339–345 marginal no. 1 et seq.
[unverifiziert – Auflagenstand prüfen] - Gottwald, in: MüKoBGB, 9th ed. 2022, Section 339 marginal no. 1 et seq., Section 343 marginal no. 1 et seq.
- Wurmnest, in: MüKoBGB, 9th ed. 2022, Section 309 No. 6 marginal no. 1 et seq.
Case law
- BGH, judgment of 23.01.2003 – VII ZR 210/01 (upper limit of the contractual penalty in construction contracts)
[unverifiziert – prüfen] - BGH, judgment of 20.01.2016 – VIII ZR 26/15 (contractual penalty in standard terms, appropriateness)
[unverifiziert – prüfen]
Check both case numbers and the percentage limits mentioned in juris / Beck-Online before use — the threshold values depend on the individual case and industry.
Output format
VERTRAGSSTRAFE — <Vertrag / Klausel> — <Datum>
I. Gesicherte Pflicht [Termin / Unterlassung / Geheimhaltung / Wettbewerb]
II. Klauselart [AGB §§ 305 ff. / Individualvereinbarung]
III. Verwirkung (§ 339) [✅ Verzug bzw. Zuwiderhandlung / ❌ — Begründung]
Vertretenmüssen: [✅ / ❌]
IV. Anspruchsrichtung [§ 340 statt Erfüllung / § 341 neben Erfüllung]
V. Vorbehalt bei Annahme (§ 341 III) [✅ erklärt am <Datum> / 🔴 fehlt — Anspruch verloren]
VI. AGB-Kontrolle [§ 309 Nr. 6 / § 307 — Befund]
Obergrenze: <…> % der Auftragssumme
Tagessatz: <…> %
Anrechnung § 340 II: [✅ / ❌]
VII. Herabsetzung (§ 343) [möglich / ausgeschlossen § 348 HGB / bereits entrichtet]
VIII. Hamburger Brauch [verwendet — § 315 BGB / beziffert]
IX. Betrag <…> EUR (Berechnung: <…>)
Gesamtbefund: [🟢 / 🟡 / 🔴]
Offene Tatsachen: <Liste>
Risks / typical mistakes
- Forgot the reservation upon acceptance — anyone who accepts the performance without reservation permanently loses the contractual penalty for improper performance (§ 341 (3) BGB).
- Contractual penalty without an upper limit agreed in standard terms and conditions — invalid under § 307 BGB; because of the prohibition of reducing a clause to its permissible content, the penalty is eliminated entirely.
- Contractual penalty irrespective of fault formulated — § 339 BGB requires default and thus fault; the clause is invalid in standard terms and conditions.
- § 348 HGB overlooked — in the case of a commercial debtor, reduction under § 343 BGB is excluded; the defense must be pursued via standard terms review and § 138 BGB.
- Contractual penalty paid without reservation — after payment, reduction under § 343 (1) sentence 3 BGB is excluded.
- Lump-sum damages confused with contractual penalty — § 309 no. 5 BGB requires the express reservation of proof of lesser damages; without it, the clause is invalid.