An unpaid invoice is not the same legal problem in London, Paris, New York or Singapore, even when the PDF looks identical. The commercial facts may be simple — goods were delivered, an invoice was issued, payment did not arrive — but the useful recovery path depends on governing law, contract terms, the debtor’s location, insolvency status, limitation periods and available enforcement tools.

The practical mistake is to ask only, “How much interest can I add?” A better sequence is: Which law governs, when did payment legally become late, what remedy is available, and is the debtor still collectible?

Start with the governing-law clause, but do not stop there

A contract may nominate a governing law and court. That is an important starting point, not always the end of the analysis. Mandatory rules, insolvency proceedings, jurisdiction agreements, consumer status, public-sector rules and enforcement against assets can change the route.

For cross-border receivables, create a one-page jurisdiction sheet before sending an aggressive demand. Record the seller’s location, buyer’s location, place of performance, governing-law clause, forum clause, invoice currency, due date, delivery evidence and known asset locations.

If those facts are unclear, calculate nothing yet.

Question 1: when is the invoice actually “late”?

The answer can come from the contract, statute, sector rule or a combination.

In the United Kingdom, GOV.UK’s late commercial payment guidance says that when a payment date is agreed it must usually be within 30 days for public authorities or 60 days for business transactions, subject to exceptions and fairness. If no payment date was agreed, the statutory framework generally treats payment as late 30 days after the later relevant event described in the guidance, such as receipt of the invoice or delivery.

Across the EU, Your Europe explains that commercial late-payment rules can create statutory interest and recovery compensation, but the applicable rate is country-specific and the governing law must be checked. The page publishes country rates for the current half-year and expressly tells businesses to check which law governs the contract.

That difference alone shows why a global “add 8% after 30 days” template is dangerous.

Question 2: is the transaction even inside the late-payment regime?

Commercial late-payment statutes commonly have scope limits.

Check whether both parties were acting as businesses, whether a public authority is involved, whether the claim is consumer-facing, whether the debtor is in an insolvency proceeding, and whether the contract validly changed default payment timing.

The EU guidance, for example, is aimed at commercial transactions and excludes certain categories such as insolvency proceedings from the ordinary late-payment route. A collection workflow should therefore tag the debtor type before automatically calculating interest.

Better practice: treat statutory interest as a jurisdiction-specific claim component, not as a universal surcharge.

Question 3: what evidence proves performance and acceptance?

Before thinking about courts, test the file.

For goods, look for purchase order, order confirmation, shipping record, delivery confirmation, inspection or acceptance record, quantity discrepancy correspondence and return history. For services, preserve the statement of work, milestone approvals, timesheets if relevant, delivered files, meeting notes and acceptance emails.

A debtor that says “we never received it” is different from one that says “we received it but quality was poor,” and both are different from “we accept it but cash is tight.”

The recovery strategy should follow the actual dispute, not the aging bucket.

Question 4: can you charge interest and recovery costs?

Sometimes yes, but the basis matters.

The UK framework permits statutory interest and fixed debt-recovery amounts in qualifying business-to-business situations. EU rules likewise provide for late-payment interest and flat-rate recovery compensation in qualifying commercial transactions, with rates varying by country.

Do not put a number into a demand merely because a spreadsheet can calculate it. Record:

  1. the contractual or statutory basis;
  2. the date from which interest runs;
  3. the principal amount;
  4. the applicable rate and date source;
  5. any fixed recovery charge;
  6. why the regime applies to these parties.

If any element is uncertain, label it for local verification before sending.

Question 5: where would you sue, and where are the assets?

Winning a claim and collecting money are separate problems.

A contract might nominate one court while the debtor’s bank accounts, inventory or real estate sit elsewhere. A judgment may need recognition or enforcement in the asset jurisdiction. Arbitration can change the enforcement route, but it also brings its own agreement, procedure and cost questions.

For smaller invoices, the economically rational answer may be a commercial settlement rather than litigation. For larger balances, asset location and enforceability can matter more than the nominal interest rate.

Build a recovery budget that compares expected net recovery, legal cost, internal time, delay and enforcement risk.

Question 6: has insolvency changed the rules?

This is a hard stop in any automated collection sequence.

In the United States, the federal courts’ Chapter 11 guidance explains that filing a bankruptcy petition generally triggers an automatic stay that suspends many collection actions on pre-petition debts, subject to statutory exceptions and possible court relief. That means a creditor should not simply continue ordinary collection because an invoice is overdue.

Other jurisdictions have their own insolvency and restructuring regimes. The operational rule is universal even if the law is not: when credible insolvency information appears, stop the standard collection workflow and obtain jurisdiction-specific advice.

Preserve the balance calculation, contracts, invoices and proof of delivery because proof-of-claim or restructuring processes may require them.

Question 7: what limitation period applies?

A receivable can become commercially old before it becomes legally time-barred, but limitation rules are jurisdiction-specific and can depend on claim type, contract law, acknowledgements, partial payments and procedural events.

Never rely on a global “six years” or “three years” assumption. Put the earliest plausible limitation date on the file and verify it locally. If the deadline is close, escalation should be driven by preservation of rights, not by the normal cadence of reminder emails.

Question 8: should the first escalation be legal or commercial?

A legal letter is not automatically the strongest first move.

If the debtor disputes quality but continues buying, an account-level reconciliation may produce faster cash. If the debtor is financially distressed, a structured payment plan with security or tighter future terms may be more valuable than a demand that accelerates failure. If the debtor is strategically unimportant and clearly refusing payment, formal escalation may be appropriate sooner.

Write down what outcome you want: full immediate payment, partial settlement, instalments, return of goods, offset, future-order leverage or preservation of a relationship. The wording should follow the objective.

A three-jurisdiction illustration

Imagine a supplier has three invoices of similar value.

UK buyer: the file may engage UK commercial late-payment rules, including statutory interest and recovery-cost concepts, after checking contract timing and scope.

EU buyer: statutory late-payment interest may exist, but the published rate and procedural path depend on the relevant country and governing law.

U.S. buyer that files Chapter 11: ordinary collection activity may be stayed. The creditor’s next step becomes a bankruptcy-process question, not a “send a stronger reminder” question.

Same invoice template. Three very different workflows.

The recovery memo that prevents expensive mistakes

Before external escalation, prepare a short memo with: parties and entities; governing law/forum; principal and currency; contractual due date; statutory late date if relevant; interest basis; delivery/acceptance evidence; dispute reason; debtor solvency signal; asset location; limitation-date estimate; and recommended next step.

This memo forces the team to separate facts from assumptions. It also gives local counsel something usable if professional advice is needed.

What changes the answer?

The answer changes materially if the debtor contests performance, a credit note or set-off exists, the debtor enters insolvency, the contract contains arbitration, the buyer is a public authority, the transaction is not truly B2B, assets sit in another country, sanctions or payment controls intervene, or the claim is approaching a limitation deadline.

Those are not edge cases to hide in fine print. They are routing rules.

Bottom line

Cross-border invoice recovery should be run as a jurisdiction-and-evidence problem, not a sequence of increasingly angry emails. First establish the applicable law and payment trigger. Then prove performance, check statutory or contractual interest, test solvency and limitation, and choose a recovery path that makes economic sense.

This guide is general commercial information, not legal advice. For a real dispute, especially before litigation, insolvency action, arbitration or a limitation deadline, confirm the current rules with qualified counsel in the relevant jurisdiction.

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