Nordic and other EU or EEA businesses chasing overdue B2B invoices, and the bookkeepers who prepare the reminder.
Como funciona
- Enter the statutory rate that applies to you — the directive sets it at the reference rate plus at least eight percentage points, and the reference rate is reset twice a year.
- Enter the fixed sum per late invoice and the currency; both are yours because the national implementation sets them.
- Add each unpaid invoice with its amount and its due date.
- Read the claim: interest, fixed sums, and the difference between counting them per invoice and per customer.
O que você ganha
- Calculates exactly what a late-paying customer owes you under EU rules — the statutory interest plus the fixed recovery sum per invoice — instead of you guessing or leaving it uncollected.
Captura de tela

Detalhes técnicos
Como configurar e usar
- Compre a licenca — sua chave (lic_...) aparece na pagina do pedido e no seu e-mail.
- Entre em app.synoriaai.com com sua chave de licenca.
- Sem instalacao — o produto roda no navegador, na sua instancia isolada.
- 1. Open the page and enter the statutory interest rate for your country (it is not built in, since it changes twice a year).
- 2. In the 'Late invoices' section, add each overdue invoice: enter its reference, customer name, amount, and due date. The day after the due date is when it becomes late.
- 3. For each invoice, the fixed recovery sum is added once automatically — you can edit it if your country's law sets a different amount.
- 4. The page calculates statutory interest as amount × rate × days / 365, rounded once at the end, and shows the formula so you can verify it.
- 5. Review the total per invoice and the overall summary, then copy or note the results for your claim.
Perguntas frequentes
Does the tool store my invoice data anywhere?
No. All calculations happen in your browser; nothing you enter is sent to a server or saved.
Can I claim the fixed recovery sum more than once per customer?
No — the fixed sum is counted once per late invoice, not per customer. If you have multiple late invoices from the same customer, each gets its own fixed sum.
What if my country's fixed sum or interest rate differs from the default?
Both the rate and the fixed sum are editable fields, so you can set the correct values for your jurisdiction before calculating.
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