Late Invoice Payment: Laws, Interest Rates & Reminder Email Templates (2026)
When Clients Don't Pay on Time
Quick Answer: Late payment interest in the EU is ECB rate + 8% (≈10.65% in 2026). In the UK it's BoE base rate + 8%. In Serbia it's set quarterly by the Ministry of Finance. You can charge this automatically — no contract clause needed. Send three escalating reminders before taking legal action. InvoiNova lets you add payment terms and bank details to every invoice so expectations are clear from the start.
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A late-paying client is one of the most common problems freelancers and small businesses face. Studies consistently show that 50–60% of B2B invoices are paid late in Europe, and the average delay is 20–30 days beyond the due date.
Knowing your legal rights — and communicating them clearly — is the fastest path to getting paid.
The Legal Framework: Late Payment Laws by Country
European Union — Late Payment Directive (2011/7/EU)
The EU Late Payment Directive applies to all commercial transactions (B2B and public authority purchases) across all 27 EU member states, including Germany, France, Spain, Croatia, Bosnia, Portugal, and others.
Key rules:
- Default payment period: 30 days from invoice receipt (or 60 days if explicitly agreed — but agreements that exceed 60 days are unenforceable if grossly unfair)
- Statutory interest: ECB reference rate + 8 percentage points, automatically applicable without any contract clause
- Minimum compensation fee: €40 flat fee per overdue invoice for debt recovery costs
- ECB reference rate (2026): 2.65% → statutory rate ≈ 10.65% per annum
You don't need to include this in your contract. The right exists automatically under law. You do need to invoice and have a clear due date.
United Kingdom — Late Payment of Commercial Debts Act 1998
The UK has its own framework, broadly equivalent to the EU directive.
- Default payment period: 30 days for public authority buyers, 60 days for B2B (subject to agreement)
- Statutory interest: Bank of England base rate + 8%
- BoE base rate (2026): 4.5% → statutory rate ≈ 12.5% per annum
- Debt recovery compensation: £40 (invoices under £1,000), £70 (£1,000–£9,999), £100 (£10,000+)
The Act applies automatically to contracts for the supply of goods or services where both parties act in the course of business.
Serbia — Zakon o rokovima izmirenja novčanih obaveza
Serbia's Law on Payment Deadlines in Commercial Transactions (Sl. glasnik RS br. 119/2012) aligns with EU standards.
- Default payment period: 60 days for commercial transactions (30 days if the buyer is a public authority)
- Penalty interest: Set quarterly by the Ministry of Finance (typically 15–18% per annum in recent years)
- Application: Automatic — no special contract clause needed
Check the current rate at the Ministry of Finance website each quarter, as it adjusts with the National Bank of Serbia reference rate.
Croatia and Bosnia
Both countries adopted the EU directive into national law:
- Croatia (HR): 30-day default, interest = NBS (Croatian National Bank) rate + 8pp, €40 equivalent compensation fee
- Bosnia (BA): Similar framework under Zakon o unutrašnjem platnom prometu, 60-day default for commercial transactions
How to Calculate Late Payment Interest
Formula for statutory EU/UK interest on a single invoice:
Interest = Invoice Amount × (Annual Rate / 100) × (Days Overdue / 365)
Example: €5,000 invoice, 45 days overdue, EU rate 10.65%
Interest = €5,000 × (10.65 / 100) × (45 / 365)
= €5,000 × 0.1065 × 0.1233
= €65.63
Plus the €40 flat compensation fee = €105.63 total you can legally claim.
In practice, most freelancers don't pursue statutory interest on first or second reminders — but mentioning that you're entitled to it is often enough to accelerate payment.
Three-Stage Reminder System
Stage 1: Friendly Reminder (1–3 days overdue)
Assume it was an oversight. Keep the tone neutral and professional.
Subject: Invoice #INV-042 — Payment Due [Date]
Hi [Name],
I'm writing to follow up on Invoice #INV-042 for €[Amount], which was due on [Date]. I wanted to check in case the invoice wasn't received or got lost in the shuffle.
You can view and download the invoice here: [link] or by replying to this email.
Payment details: Bank: [Bank Name] IBAN: [IBAN] Reference: INV-042
Please let me know if you have any questions. Thank you.
[Your name]
Stage 2: Formal Notice (7–14 days overdue)
Reference the overdue status and your legal right to charge interest.
Subject: Overdue Invoice #INV-042 — Action Required
Hi [Name],
Invoice #INV-042 for €[Amount], due [Date], remains unpaid. This is a formal payment reminder.
Under the EU Late Payment Directive (2011/7/EU), I am entitled to charge statutory interest at 10.65% per annum from the due date, plus a €40 compensation fee. I have not added these to the invoice at this stage.
Please arrange payment within 7 days to avoid additional charges.
IBAN: [IBAN] | Reference: INV-042
If payment has already been sent, please confirm so I can update my records.
[Your name]
Stage 3: Final Notice (21–30 days overdue)
State clearly what happens next. Be factual, not emotional.
Subject: Final Notice — Invoice #INV-042 (€[Amount] + Interest)
Hi [Name],
Invoice #INV-042 for €[Amount] remains unpaid despite two previous reminders. This is a final notice before I proceed with formal debt recovery.
Outstanding balance:
- Original invoice: €[Amount]
- Statutory interest ([X days] at 10.65%): €[Interest]
- Recovery compensation fee: €40.00
- Total due: €[Total]
If full payment is not received by [Date — 7 days from now], I will proceed with [small claims court / debt collection / solicitor action] without further notice.
[Your name]
After the Three Reminders: Escalation Options
If reminders fail, you have several paths:
1. Small claims court
- UK: up to £10,000 via Money Claim Online
- DE: Mahnverfahren (court order procedure for undisputed debts) — fast, low cost
- RS: Platni nalog (payment order) — district court, straightforward for undisputed invoices
- EU generally: European Small Claims Procedure for cross-border claims under €5,000
2. Debt collection agency Agencies take a percentage (typically 15–25%) but handle all contact. Useful when you don't want to manage the process or the relationship is already broken.
3. Solicitor / lawyer letter A formal legal letter often triggers payment without going to court. Cost: €50–€200 for a single letter. Effective because it signals seriousness.
How to Prevent Late Payments
The best reminder is one you never have to send. Several practices reduce late payments significantly:
Add clear payment terms to every invoice. State the due date explicitly — not just "Net 30" but the actual calendar date. InvoiNova has a payment terms field in the notes section. See our guide on invoice payment terms for the right terms to use.
Include bank details on the invoice. Don't make clients ask. Add your IBAN, BIC, and a payment reference directly on the PDF using InvoiNova's custom fields. The fewer steps between "invoice received" and "payment initiated," the better.
Invoice promptly. Late invoices get paid late. Send the invoice the same day as delivery or on a fixed billing date each month.
For larger projects: require a deposit. A 30–50% upfront deposit ensures you're never fully exposed and signals that the client is serious.
For recurring clients: use saved templates. InvoiNova's saved templates let you generate and send invoices in under 60 seconds — removing friction from the billing process.
When a Client Is Genuinely Struggling
Sometimes late payment is a cash flow problem, not avoidance. If a client communicates proactively, it's worth considering a payment plan. Document the agreement in writing: how much, on what dates, and what happens if they miss a payment plan installment.
A partial payment is better than a dispute that delays everything further.
Summary
| Country | Default Period | Interest Rate (2026) | Flat Compensation |
|---|---|---|---|
| EU (all members) | 30 days | ECB + 8% ≈ 10.65% | €40 |
| UK | 30–60 days | BoE + 8% ≈ 12.5% | £40–£100 |
| Serbia | 60 days | Min. Finance quarterly (~15–18%) | — |
| Croatia | 30 days | HNB rate + 8% | €40 equiv. |
| Bosnia | 60 days | Similar to EU | — |
Use the three-stage reminder system. Mention statutory interest in Stage 2. Set a hard deadline in Stage 3. Escalate if needed — you have legal tools available in every country listed above.
Set clear payment terms before the invoice is overdue. Start with our invoice payment terms guide to pick the right terms for your situation.
FAQ
Frequently asked questions
Under the EU Late Payment Directive (2011/7/EU), the statutory interest rate is the ECB reference rate plus 8 percentage points. As of 2026, the ECB rate is 2.65%, making the statutory rate around 10.65% per annum. This applies automatically — you don't need a contract clause.
Keep it professional and factual. State the invoice number, due date, amount owed, and how to pay. For a first reminder, be polite and assume it was an oversight. For a second reminder, reference the statutory interest. For a final notice, state that legal or collection action will follow.
First send a formal written notice (letter or email). Then consider: small claims court (UK: up to £10,000; DE: Mahnverfahren for undisputed debts; RS: platni nalog), a debt collection agency, or a solicitor/lawyer. Document every communication step.
No. The directive covers commercial transactions (B2B and public authority payments). B2C late payment is governed by national consumer law, which typically offers fewer automatic remedies.