How to write a Mahnung in Germany (2026): templates, deadlines, default interest
A valid German Mahnung is what legally puts your debtor in default — and what unlocks default interest, the statutory €40 flat fee, and access to the court-administered Mahnverfahren. This guide walks through the six elements a Mahnung needs to be legally effective, the three customary escalation stages with complete template text, how to calculate default interest under §288 BGB in 2026, and the volume threshold where manual dunning costs more than the receivables you lose.
What a valid Mahnung must achieve
A Mahnung is more than a reminder. Legally, it is the instrument that puts the debtor into default — and that is what opens the door to default interest, statutory flat fees, and a later court-administered Mahnverfahren (§ 286 BGB). Without a valid Mahnung, neither default interest nor the statutory €40 flat fee under § 288 (5) BGB can be claimed.
For a Mahnung to be effective it needs six elements: clear identification as a Mahnung or payment demand, unambiguous reference to the open invoice (number, date, amount), a concrete payment deadline, a stated consequence of non-payment, a date and signature, and a deliverable address.
One exception: if the original invoice carries a calendar-fixed due date (e.g. payable by 14 July 2026), default sets in automatically under § 286 (2) No. 1 BGB once the date passes — a Mahnung is not strictly required to claim default interest. In practice it remains worthwhile: it documents that you reacted, and it produces payment more often than a courtroom reference to BGB paragraphs.
First, second, third Mahnung — what to send when
German business practice uses three escalation stages — none of which are required by statute. They became standard because they form a reasonable pattern: polite, firm, then unambiguous. Skipping to stage three damages the customer relationship; sending three polite nudges burns time and cash flow.
A workable B2B SME sequence typically looks like this:
| Stage | Timing | Tone | Stated consequence | Dunning fee |
|---|---|---|---|---|
| 1st Mahnung | 7 days after due date | Polite, neutral | Notice of default on non-payment | None |
| 2nd Mahnung | 14 days after 1st | Firm, factual | Default interest + €40 flat fee | €2.50–5.00 |
| 3rd Mahnung | 14 days after 2nd | Brief, clear | Court Mahnverfahren / handover to partner | €5.00 |
Mahnung templates: copy-paste text for each stage
The text blocks below are phrased to trigger default in a legally durable way while preserving the business relationship. Replace the bracketed placeholders and adjust greeting and sign-off to your house style.
Template — first Mahnung (payment reminder):
Dear [CONTACT],
our invoice no. [INVOICE NUMBER] dated [INVOICE DATE] for the amount of EUR [AMOUNT] became payable on [DUE DATE]. Your payment may have crossed with this letter — in which case please consider this notice as obsolete.
If payment is still outstanding, we kindly ask you to transfer the open amount by [DEADLINE +7 DAYS] to the following account: [BANK DETAILS].
Kind regards, [YOUR NAME]
Template — second Mahnung (with default notice):
Dear [CONTACT],
despite our payment reminder of [DATE OF 1ST MAHNUNG], our invoice no. [INVOICE NUMBER] for EUR [AMOUNT] remains unpaid. You have been in default since [DATE].
We ask you to settle the amount including the accrued default interest of EUR [INTEREST AMOUNT] and a dunning fee of EUR 5.00 by [DEADLINE +14 DAYS]. In the event of further non-payment we will additionally claim the statutory default flat fee of EUR 40.00 under § 288 (5) BGB.
Kind regards, [YOUR NAME]
Template — third Mahnung (final notice):
Dear [CONTACT],
despite two prior reminders, our invoice no. [INVOICE NUMBER] for EUR [AMOUNT] remains unpaid. We hereby grant you a final deadline of [DEADLINE +14 DAYS].
After this date we will initiate the court Mahnverfahren without further notice. All resulting costs — court fees, legal fees, enforcement costs — will be charged to you in full.
Kind regards, [YOUR NAME]
Calculating German default interest in 2026
Default interest is governed by § 288 BGB. For B2B receivables — where the debtor is a commercial entity, not a consumer — the rate is base rate + 9 percentage points. For B2C receivables it is base rate + 5 percentage points.
The base rate (Basiszinssatz) is set twice a year, on 1 January and 1 July, by the Deutsche Bundesbank and published at bundesbank.de. It moves — in early 2026 it sits markedly above the values of the 2016–2021 low-rate period. Always pull the current value before drafting a Mahnung.
Formula: Default interest = receivable × (base rate + 9 % or 5 %) × (days in default / 365)
Worked example: Invoice of EUR 4,800.00, 30 days in default, base rate assumed at 3.12 %. B2B default rate: 3.12 % + 9 % = 12.12 %. Default interest = 4,800 × 12.12 % × 30 / 365 = EUR 47.80.
B2B receivables additionally trigger the €40 statutory flat fee under § 288 (5) BGB: it becomes due automatically once default has set in — independent of actual damages and independent of the receivable amount. The flat fee is set off against any later claim for collection costs or legal fees, but is not lost.
Dunning fees: what you may charge
Dunning fees are not penalty payments — they reimburse you for actual processing costs. German courts have settled on EUR 2.50 to EUR 5.00 per Mahnung as defensible without itemised cost evidence.
Three rules from case law worth knowing:
No dunning fee on the first Mahnung — without default already in place, there is no legal basis. Fees can only be added from the second Mahnung onward.
Flat fees above EUR 5.00 are routinely cut by Amtsgerichte unless specific additional cost is documented. Stay conservative.
Collection-agency fees are only reimbursable, per BGH case law, if the agency was instructed *after* default set in and the debtor was not obviously insolvent or refusing to pay.
Email, letter, or registered mail — what counts in court
There is no statutory form requirement for a Mahnung: email, letter, even verbal Mahnungen are valid. What matters is that the Mahnung actually reaches the recipient (§ 130 BGB).
In court it is not what you sent that matters but what you can prove. In practice:
Email: Pragmatic and fast, but receipt is hard to prove — read receipts can be falsified. Adequate for the first and second Mahnung; risky for the third.
Letter: The default channel. Receipt is presumed (three business days after posting) in case of dispute.
Registered mail with return receipt (Einschreiben mit Rückschein): Proves receipt, but expensive (over EUR 4 per envelope) and often counterproductive — debtors refuse acceptance. Worth it for the third Mahnung when court proceedings are likely.
Drop-in registered mail (Einwurf-Einschreiben): Middle ground — cheaper than return-receipt registered mail, proves delivery to the mailbox, does not prove that anyone read it. Best balance for most cases.
When manual dunning becomes more expensive than the write-off
A Mahnung costs time — pulling the invoice, drafting the letter, calculating default interest, sending, scheduling a follow-up. For an SME with twenty open items a month this is two to three hours per week.
The maths becomes interesting when you do it honestly. At an internal hourly cost of EUR 60, ten manual Mahnungen per week cost roughly EUR 1,500 per month. A software solution like kvit costs EUR 49 per month plus 4 to 8 percent on amounts actually recovered — and handles not just the writing but also escalation, the debtor's language, the right channel, and the documentation.
The break-even is roughly ten overdue invoices per month. Below that, manual dunning makes sense — especially when receivables are large and relationships individual. Above that, automation is honestly cheaper, faster, and more consistent.
When the third Mahnung is not enough
If payment still does not arrive after the third Mahnung, three paths remain, separated by receivable size and the standing of the relationship.
Court Mahnverfahren (Mahnbescheid). Standard route for undisputed claims. Application is filed online through the EDA portal at the responsible court; court fees depend on the amount in dispute (around EUR 73 for a EUR 5,000 claim). If the debtor does not file an objection, a Vollstreckungsbescheid is issued within weeks — a full enforcement title.
Instructing a collection agency. Faster in operation, but expensive at 15 to 35 percent success commission. Worthwhile mainly when you do not have capacity for the Mahnverfahren yourself and the receivable is large enough to justify the commission.
Civil action. Mandatory if the debtor objects to the Mahnbescheid — the case then moves automatically into adversarial proceedings. Mandatory legal representation from EUR 5,000 in dispute upwards. The losing party normally bears the costs.
Four steps to a legally durable Mahnung
From open receivable to dispatched Mahnung — the pragmatic flow that holds up in court.
- Determine due date and defaultCheck the original invoice: if it carries a calendar-fixed due date, default has set in without a Mahnung. If only a payment window is given without a specific date, you need the Mahnung to establish default.
- Calculate default interestPull the current base rate from bundesbank.de, add 9 percentage points for B2B (5 for B2C), multiply by the receivable and days in default, divide by 365. Include the result in the Mahnung.
- Draft the letterVerify the mandatory elements: identification, invoice details, new deadline, stated consequences, date, bank details. Use the template from this guide and replace placeholders. For the second and third stage, itemise the default flat fee and dunning fee.
- Send and documentFirst and second Mahnung by email or letter. Third Mahnung by drop-in registered mail if the court Mahnverfahren is likely. Document the dispatch date, recipient and content in your bookkeeping — this is your evidence in a later dispute.
Frequently asked questions
- Does an unpaid invoice itself count as a Mahnung?
Only under one condition: if the invoice carries a calendar-fixed due date — a specific date like payable by 14 July 2026, not just payable within 14 days — default sets in automatically under § 286 (2) No. 1 BGB once the date passes. No additional Mahnung is then required to claim default interest. In all other cases you need an explicit Mahnung.
- How many Mahnungen does German law require?
None. The customary three-stage sequence is business practice, not statute. In theory a single Mahnung is enough to establish default — and you could initiate the court Mahnverfahren immediately afterwards. In practice this damages customer relationships and is legally riskier, since courts look favourably on prior attempts at amicable settlement.
- When exactly does default begin?
Three possible points: (1) for a calendar-fixed due date, the day after the deadline passes — automatically, without a Mahnung. (2) for invoices without a specific due date, with receipt of the first Mahnung. (3) for B2B receivables, at the latest 30 days after receipt and due date of the invoice, absent a different agreement (§ 286 (3) BGB) — also without a Mahnung. The third is the most important and most overlooked rule in B2B.
- Are dunning fees taxable?
Yes, dunning fees are genuine operating income and therefore subject to income tax — but not themselves VAT-taxable, as they are treated as damages (no exchange of services). Book them net to an account such as Income from Mahnungen or equivalent. Default interest is also operating income and not VAT-taxable.
- Can I file for the court Mahnverfahren without a prior Mahnung?
Yes — if the debtor is already in default (see question 3), you can file the Mahnbescheid directly. A prior out-of-court Mahnung is not required. In practice it is almost always worth sending one first: cheaper, faster, and surprisingly often it produces payment before court fees are incurred.
- What happens if the debtor objects to the Mahnbescheid?
The proceedings move automatically into adversarial litigation before the competent civil court. You then have to substantiate the claim — explain why it exists. Above EUR 5,000 in dispute, legal representation is mandatory. Costs normally fall on the losing party. For a realistically substantiable claim the procedure is manageable; for a disputed claim, consult a lawyer before filing.
Read next
- Automate the Mahnverfahren end-to-endHow kvit automates from first reminder through to court Mahnverfahren — including EDA filing via a BfJ-registered partner.
- Mahnung — definition and legal effectDeeper definition with reference to § 286 BGB, distinction from payment reminders and from default without Mahnung.
- Receivables software for SMEs — 2026 comparisonWhich software fits DACH SMEs? Comparison of kvit, Bilendo and classic collection agencies — pricing, features, setup time.
- What collection costs in 2026 — full breakdownWhat German collection agencies can charge under RVG, customary success commissions, and when software is cheaper.
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