Documenting an overdue invoice in Ireland

If you’re an Irish business chasing payment for completed contracted work, start by building a single, dated case file that proves the contract, delivery/acceptance, the invoice itself and your attempts to recover the debt. You can rely on statutory late‑payment interest and the fixed compensation rules under the European Communities (Late Payment in Commercial Transactions) Regulations 2012 without first sending a reminder, but you still need clear documentary evidence if you later issue a formal demand or bring a civil claim. See the Department of Enterprise guidance on late payment for the statutory basis and procedures for claiming interest and compensation.

The paragraphs below explain what matters, why it matters, and the practical next steps for most small contractors, consultants and suppliers in Ireland. Where I state legal points I link the relevant Irish official sources so you can check the rules yourself.

How Irish law affects an overdue commercial invoice

If the invoice arises from a commercial transaction, the supplier is automatically entitled to statutory late‑payment interest and a fixed sum to compensate for recovery costs under the Regulations implementing the EU late‑payment rules. You do not have to send a reminder before interest starts to run; the entitlement exists by operation of the Regulations. For an official overview, see the Department of Enterprise’s page on late payment in commercial transactions.

Key practical points from the Regulations:

• The statutory interest rate is the European Central Bank (ECB) main refinancing rate plus 8 percentage points; interest is calculated daily unless the contract states otherwise. The Department publishes the Late Payment Interest Rate and a table for historical rates.
• Fixed compensation for recovery costs is set by bands under the Regulations (for example, small fixed sums for lower‑value invoices) and the Department explains the compensation for recovery costs rule. You may also claim reasonable additional costs in exceptional cases.
• The payment becomes “late” according to the Regulations’ timing rules (commonly 30 days after receipt of a valid invoice unless the parties agreed a specific date). Public authorities may not set longer than 30 days and B2B terms over 60 days require express agreement and must not be grossly unfair. See the Department’s explanatory page above for details.

If you later need formal enforcement, remember the small‑claims procedure (the €2,000 track) explicitly excludes ordinary debt/unpaid invoice claims — you must use the normal civil claim routes (District, Circuit or High Court) depending on the amount and complexity. The Courts Service explains the small‑claims exclusions on its small claims guide.

What evidence to collect and how to organise it

A civil court or a County Registrar will expect a clear chronology and supporting documents. Build a single case folder (digital and scanned backups) containing the items below. Each item is what courts and enforcement offices will naturally look for when you ask for judgment or enforcement.

Essential documents

• Contract / scope of work: the signed contract, written estimate, statement of work, change orders and any documented oral terms. This proves the agreed price and payment terms and shows whether your contract varied the default statutory rules. (See the Department’s late‑payment guidance above.)
• The invoice: keep the original invoice and a dated copy showing invoice number, date, description of work, VAT details (if applicable) and payment instructions. The invoice date/receipt often triggers the 30‑day payment clock.
• Proof of delivery/acceptance of the work: completion certificates, signed handover forms, acceptance emails, photographs, meeting minutes or site sign‑offs that show the client accepted the work.
• Correspondence log: emails, texts, call notes and any formal letters with dates. Record all telephone contact (time, person, what was said) and retain copies of sent emails and any read‑receipt evidence.
• Proof of attempts to recover payment: copies of reminder emails/letters, registered post receipts or courier tracking, and any responses from the client.
• Bank statements / ledger extracts: these corroborate that the invoice remains unpaid and are necessary if you claim statutory interest (courts will check the arithmetic).
• Subcontractor invoices, receipts and timesheets: if the client disputes performance, these documents show what you did and why the invoice was due.
• VAT and tax records: if you’re VAT‑registered you must retain invoices and records under Revenue rules; Revenue guidance explains the tax treatment of interest and compensation under the Regulations (see the Revenue technical document on tax treatment of interest and compensation under S.I. No. 580/2012).

Organise files chronologically with a short index (e.g., 01_contract.pdf, 02_invoice_2024-05-12.pdf, 03_acceptance.pdf, 04_correspondence.zip). Keep originals where possible and scan everything into a secure, date‑stamped folder.

What to send (a formal demand) and when to escalate

A firm written demand is good commercial practice: it summarises the claim, shows you have documented the file, and creates a clear deadline before litigation. Although you do not need to send a demand to claim statutory interest, a demand letter achieves three practical aims: it makes a final recovery attempt, it narrows issues if a dispute follows, and it creates a record you can show a court.

What to include in a short formal demand:

• Invoice number, invoice date, original due date and amount outstanding.
• A clear statement that statutory late‑payment interest and compensation under S.I. No. 580/2012 are accruing (link to the Department’s guidance for the recipient if helpful).
• A short record of the work’s acceptance (reference to completion certificate or email).
• A firm payment deadline (commonly 7–14 days) and the bank details for payment.
• A statement of next steps if payment is not received (e.g., commencing a civil claim).

Send the demand by email and, for proof of service, by registered post or recorded delivery; keep delivery receipts. If you prefer professional drafting of a demand, consider BeforeSuit's professional demand-letter preparation service.

When to start court proceedings

If the debtor refuses to pay, choose your court by the claim size and legal complexity. The small‑claims track is not available for ordinary unpaid invoices; consult the Courts Service small claims guidance to confirm exclusions. For formal guidance on bringing higher‑value debt claims see the Courts Service’s procedural guide to making a debt claim in the High Court.

Practical timing rules to watch:

• Limitation: most contract claims must be started within six years under the Statute of Limitations 1957 — check the Statute of Limitations if a claim is old.
• Local enforcement practice: enforcement options (sheriff, County Registrar, garnishee, charging order) vary by county; see Law Reform Commission material on enforcement for an overview of typical remedies and practical issues (Law Reform Commission consultation materials).

A brief worked example and common pitfalls

Hypothetical illustration (numbers are illustrative only): a contractor has a €5,000 invoice unpaid 60 days after the invoice date. If the statutory annual interest rate were 10% (this is an example rate only), annual interest on €5,000 would be €500; 60 days’ interest = €500 * (60/365) ≈ €82. Keep in mind the actual rate you must use is the ECB main refinancing rate plus 8 percentage points; check the Department’s interest‑rate page for the correct figure before doing the arithmetic.

Common mistakes to avoid

• Relying on a single unspecific email as proof of acceptance. Prefer explicit acceptance records (signed completion, handover note).
• Waiting too long — limitation and the loss of contemporaneous records weaken a claim.
• Trying the small claims route for an ordinary unpaid invoice — the Courts Service excludes debt claims from that track.

If the debtor disputes the work’s quality or alleges set‑off, account for that dispute in your correspondence and gather the technical evidence (photos, test records, subcontractor notes). If insolvency, large disputes or complex contractual issues arise, get legal advice early.

If you follow the evidence checklist above and send a clear formal demand first, you give yourself the best chance of a commercial recovery without court time — and, if a claim is necessary, you will already have the file a court expects.