Documenting an overdue invoice for completed contracted work in Ireland

If you’re an Irish business chasing payment for work you have completed, the single most important task is clear, chronological documentation: keep the contract or scope, a dated invoice that shows the completion and due dates, evidence the client accepted the work, and a full record of all communications and any follow-up demands. Those items are what a court, the Small Claims procedure or a third party will look at first — and they also let you calculate statutory late payment interest and fixed compensation under the Irish regulations.

The rest of this article explains exactly which documents matter, how to create a defensible demand, what statutory entitlements you can include, the relevant time limits, and realistic next steps if the debt remains unpaid. Where legal or procedural rules are cited I point you to official Irish sources so you can check details and forms yourself.

What documents you must assemble first

Start by assembling four core categories of evidence. A judge or Small Claims adjudicator will want these in a simple, chronological bundle.

• The contract or scope of work: this can be a signed contract, a purchase order, or a chain of emails that clearly records the agreed scope, price and any change orders. If performance was varied, keep written change confirmations.

• The invoice itself: keep the original invoice showing (a) invoice number, (b) supply or completion date, (c) payment due date, (d) VAT details if relevant, and (e) the precise amount outstanding. Courts and the Small Claims guidance emphasise accurate dates and correct respondent identity; keep an exact copy of what was sent. See the Courts Service guidance on small claims for what they expect to see when you apply: How to make a small claim — Courts Service.

• Proof of performance and acceptance: delivery notes, signed completion or practical completion certificates, client sign‑off emails, photographs of the finished work, site sign‑off sheets, or timesheets. If a particular employee or manager accepted the job, note their name and the acceptance date. This is the evidence that the work was completed as invoiced.

• Communication trail and payment history: save every email, text, letter and any payment remittance advice. If you spoke by phone, write a short contemporaneous note of date, time, who you spoke to and the substance, and follow up with an email summarising the call so there is a written record.

What you can claim under Irish law and where to check the rules

Under Irish regulations implementing the EU Late Payment Directive, suppliers in business-to-business transactions have an implied right to claim statutory late payment interest and a fixed sum in compensation for recovery costs once the payment date passes. The regulations that implement this in Ireland are in the Irish Statute Book; you should check the text when calculating exact figures: European Communities (Late Payment in Commercial Transactions) Regulations 2012 — Irish Statute Book.

Practical points:

• The statutory right to interest applies "without the necessity of a reminder", but sending a clear written demand is still useful evidence and can prompt an acknowledgement that may affect limitation.
• The fixed compensation bands and the method for calculating interest use a reference rate specified in the regulations. Confirm the current reference rate before you claim a numeric interest amount.

If you need to understand how to pursue a debt through the courts, the Courts Service explains court-based debt claims and the Small Claims procedure, which may be appropriate for lower-value disputes: Making a debt claim — Courts Service.

Tax treatment

Revenue treats statutory late interest and compensation as taxable income or deductible costs in the ordinary way; see Revenue’s technical guidance for details: Revenue guidance on tax treatment of interest and compensation.

How to write a defensible written demand and what to include

A written demand is not legally required to trigger statutory interest, but it is the best way to create a clear contemporaneous record and to invite payment without immediate legal costs. Send the demand by email and by a recorded method (signed post or tracked delivery) and keep proof of service.

A practical demand should:

• Identify the invoice number, original issue date, completion date and the unpaid amount.
• State a firm payment deadline (commonly 7–14 days). Describe it as a commercial deadline rather than a statutory requirement unless the contract specifies otherwise.
• Explain you will claim statutory late-payment interest and the fixed compensation available under the Irish late-payment regulations if payment is not made; give the statutory reference so the recipient can verify it (link to the SI above).
• Attach or summarise key proof of completion (e.g., signed acceptance). Offer a simple way to pay immediately (bank details, BACS, etc.).

Example (brief): identify invoice, state amount, set 10 working days deadline, warn you will add statutory interest and compensation and consider a court claim if unpaid. Keep the tone professional — courts expect the demand to be a pragmatic commercial step, not an escalation of rhetoric.

For professionally drafted demand letters prepared from your material, you may consider a document preparation service that helps turn your evidence into a clear demand — for example, . Such services prepare documents for you to send; they are not legal representation.

Timing: limitation, acknowledgements, and practical deadlines

The ordinary limitation period for contract and debt claims in Ireland is six years from when the cause of action accrues (typically the contractually due date for payment). This is set out in the Statute of Limitations, 1957: Statute of Limitations, 1957 — Irish Statute Book. Key practical implications:

• Act promptly once the invoice is overdue. If the debtor gives a written acknowledgement of the debt or makes a part payment, the limitation clock can restart — keep any such messages safely.
• If the debt sits unpaid for years, you may lose the ability to bring a court claim even if the debt is genuine.

If demand fails: choosing the right recovery route

Your options depend on the amount, complexity and whether the debtor disputes performance:

• Small Claims Procedure: suitable for straightforward, low-value disputes. The Courts Service explains how to apply: How to make a small claims application — Courts Service.

• District Court / Circuit Court debt claim: use for higher-value claims or disputed matters. The Courts Service guide on making a debt claim explains thresholds and forms: Making a debt claim — Courts Service.

• Legal advice and enforcement: if the invoice is disputed on quality or scope, if the debtor is a public authority, or if enforcement will be required after judgment (e.g., seizure of assets, insolvency proceedings), get qualified Irish legal advice. The Courts Service has background material on understanding debt: Understanding debt — Courts Service.

A short checklist to finish up and realistic expectations

1. Bundle: contract/scope, invoice, acceptance proof, communications.
2. Calculate: outstanding amount and, if you will claim it, statutory interest/compensation — check the SI for the precise formula. Irish Statute Book — SI 2012/580
3. Send a clear written demand (email + recorded post) with a 7–14 day deadline and proof of service.
4. If no payment, decide between Small Claims, District/Circuit Court, or instructing a solicitor depending on value and complexity.
5. Keep all proof of service, payment attempts, and any acknowledgements.

A well-documented demand does not guarantee payment — but it makes any subsequent court or Small Claims application far simpler and more likely to succeed. If the matter becomes contested, or you need to enforce a judgment, specialist legal advice in Ireland is the sensible next step.

For help preparing a professional dispute document, BeforeSuit can help you prepare your next steps.