Late Payment Fees & Interest: The Complete Guide 2025

When customers don't pay on time, you have the right as a business owner to charge late payment fees and interest. But how much can you charge? And when exactly? This guide explains everything you need to know.

Legal Basis: When Does Default Occur?

Automatic Default

In most jurisdictions, default occurs automatically under certain conditions:

For Consumer Transactions (B2C)

For private customers, you typically need to send a reminder first before default occurs – unless:

• A specific payment date was agreed
• The invoice contains a clear reference to the 30-day rule

Important: On every invoice to consumers, include:

"Payment is due within [X] days. You will be in default 30 days after the due date and receipt of this invoice without requiring a reminder."

Default Interest: How to Calculate Correctly

Statutory Default Interest Rates 2025

Default interest rates are typically regulated by law:

Note: Rates vary by country. In the EU, this is standardized. In the US, rates depend on state law or contract terms.

Example calculation (EU):

• Current base rate: 3.37%
• B2C: 3.37% + 5% = 8.37% p.a.
• B2B: 3.37% + 9% = 12.37% p.a.

Calculating Default Interest

The formula:

Default Interest = (Invoice Amount × Interest Rate × Days Overdue) / 365

Example B2B:

• Invoice amount: €5,000
• Days overdue: 45 days
• Interest rate: 12.37%

Interest = (€5,000 × 12.37% × 45) / 365
Interest = (€5,000 × 0.1237 × 45) / 365
Interest = €27,832.50 / 365
Interest = €76.25

Example B2C:

• Invoice amount: €500
• Days overdue: 30 days
• Interest rate: 8.37%

Interest = (€500 × 8.37% × 30) / 365
Interest = (€500 × 0.0837 × 30) / 365
Interest = €1,255.50 / 365
Interest = €3.44

Default Interest Calculator

Late Payment Fees: What's Allowed?

Principle: Compensation for Actual Costs

Late payment fees are compensation for your actual costs. You can charge for:

1. Staff costs for collection activities
2. Postage for reminder letters
3. Material costs (paper, envelopes)
4. Administration and follow-up

Accepted Fee Amounts in Practice

Courts typically accept these amounts:

B2B: The €40 Flat Rate (EU)

For business customers in the EU, you have an additional claim to a flat rate of €40 for collection costs:

• Once per invoice (not per reminder)
• Automatic upon default
• Independent of late fees
• Only applies to B2B, not consumers

Example Total Claim B2B:

Original invoice:           €5,000.00
€40 flat rate:                 €40.00
Default interest (45 days):    €76.25
Late fee (2nd reminder):        €7.50
─────────────────────────────────────
Total claim:                €5,123.75

Limits on Late Fees

Warning: Excessive late fees are unenforceable!

Not allowed:

• Flat rates over €10-15 per reminder (without proof)
• Late fees on the first payment reminder
• Collection agency fees before actual engagement
• "Processing fees" without real costs

The Optimal Collection Process

Stage 1: Payment Reminder (Friendly)

Timing: 3-5 days after due date Costs: No late fees Interest: Already possible for B2B

Subject: Friendly Payment Reminder – Invoice [No.]

Dear [Name],

When reviewing our payment records, we noticed that
invoice [No.] dated [Date] for [Amount] is still outstanding.

This is surely an oversight. Please transfer the amount
within the next 7 days.

If you have already made the payment, please disregard
this message.

Best regards

Stage 2: First Reminder

Timing: 14 days after due date Late fee: €2.50 – €5.00 Default interest: Yes

Subject: 1st Reminder – Invoice [No.]

Dear [Name],

Despite our payment reminder, the following invoice
remains unpaid:

Invoice No.:     [Number]
Invoice date:    [Date]
Amount:          [Sum]
Overdue since:   [Date]

Please settle the amount plus late fees of [X] €
and default interest within 10 days.

Total amount: [Sum including fees]

Best regards

Stage 3: Second Reminder

Timing: 28 days after due date Late fee: €5.00 – €7.50 Default interest: Yes Warning: Collection/legal action

Subject: 2nd Reminder – Final Notice Before Legal Action

Dear [Name],

Unfortunately, you have not responded to our previous
reminders. We urge you one last time to settle the
outstanding claim:

Original amount:        [Sum]
Default interest:       [Sum]
Late fees:              [Sum]
─────────────────────────────────
Total claim:            [Sum]

If the amount is not received within 7 days, we will
be forced to initiate legal proceedings without further
notice.

This may result in significant additional costs for you
(collection, legal, and court fees).

Best regards

Stage 4: Collection Agency or Legal Action

After the final reminder:

Option A: Collection Agency

• Cost: 15-30% of the claim
• Advantage: No effort on your part
• Disadvantage: Lower net return

Option B: Legal Proceedings

• Cost: Depends on claim amount
• Advantage: Full claim + costs
• Disadvantage: Time investment

Late Fees and Interest in Accounting

Recording Income

Received late fees and default interest are business income:

VAT on Additional Charges

Important: Late fees and default interest are typically not subject to VAT!

They are considered compensation for damages, not payment for services.

Practical Tips for Your Collection Process

1. Automate the Process

With invoicing software like Clever Invoice:

• Automatic payment reminders
• Default interest calculation
• One-click reminder stages
• Overview of open items

2. Document Everything

For worst-case scenarios, you need proof:

• [ ] Invoice dispatch (date, method)
• [ ] Reminders (date, content)
• [ ] Customer communication
• [ ] Payment agreements

3. Stay Professional

Even when frustrated with late payers:

• Remain factual and polite
• No threats or insults
• Legally correct wording
• Keep customer relationship in mind

4. Check Creditworthiness First

For new customers and larger orders:

• Request advance payment or deposit
• Conduct credit check
• Set shorter payment terms

5. Offer Payment Plans

For payment difficulties:

• Payment plans can prevent total loss
• Document agreement in writing
• Continue charging default interest

Common Mistakes to Avoid

Mistake 1: Too Strict Too Soon

An immediate reminder threatening lawyers damages customer relationships. Always start friendly.

Mistake 2: Waiting Too Long

The longer you wait, the less likely payment becomes. Establish a fixed rhythm.

Mistake 3: Excessive Fees

Unrealistic late fees are unenforceable and harm your credibility.

Mistake 4: No Documentation

Without proof of reminders, you'll have a weak case in court.

Mistake 5: Forgetting Interest

Many business owners give away money by not charging default interest.

Special Cases

Partial Payment Received

For partial payments:

1. Apply to interest first
2. Then to principal
3. Recalculate and communicate

Customer Disputes the Claim

When a customer challenges the invoice:

1. Clarify the matter
2. Provide proof of service if needed
3. For valid objections: Issue credit note
4. For invalid objections: Continue collection with explanation

Statute of Limitations

Warning: Claims expire!

• Standard limitation: 3-6 years (varies by jurisdiction)
• Check your local laws for specific periods

Interruption through:

• Legal action
• Court order
• Enforcement measures

Conclusion: Professional Collection Pays Off

A structured collection process:

• Improves your cash flow
• Reduces bad debts
• Appears professional
• Preserves customer relationships

Key Points:

1. Default interest: Know your jurisdiction's rates
2. €40 flat rate: B2B only (EU), once per invoice
3. Late fees: €2.50 – €10 per reminder, proportional to effort
4. Process: Start friendly, follow through consistently
5. Documentation: Record everything in writing

With modern invoicing software like Clever Invoice, you can automate the entire collection process and always keep track of your outstanding receivables.