May 27
If you are a UK contractor taking on work in the Republic of Ireland, the most expensive surprise may not be the exchange rate, travel or materials. It may be Relevant Contracts Tax.
RCT is Ireland’s withholding tax regime for certain payments in the construction, forestry and meat processing sectors. For construction businesses, it can mean 20% or 35% being withheld from payments before the money reaches you. UK residence does not exempt you where the relevant operations are carried out in Ireland.
A non-resident principal who subcontracts relevant work in Ireland may have to operate RCT. A non-resident subcontractor carrying out relevant operations in Ireland may have RCT withheld from every payment. Get the registration and deduction-rate position wrong, and the cash flow hit can land immediately, often on the first invoice.
This article is for UK-based contractors, subcontractors, developers and specialist trades taking on projects south of the border. It explains how RCT works, how it interacts with VAT, where the cash flow pressure comes from, and what to put in place before you start the job rather than after the first payment is short.
RCT is often compared with the UK Construction Industry Scheme, but the two systems are not identical. You cannot assume CIS knowledge transfers cleanly.
RCT applies where a principal contractor makes a relevant payment to a subcontractor for relevant operations. It operates in construction, forestry and meat processing. In the construction sector, it catches a wide range of building, installation, alteration, repair and demolition works.
The key point for UK contractors is territorial scope. If the relevant operations are carried out in Ireland, RCT can apply regardless of where the contractor or subcontractor is resident. A UK principal subcontracting construction work in Ireland has to consider RCT. A UK subcontractor carrying out Irish construction work can be subject to RCT deductions.
All RCT compliance is handled online through Revenue’s Online Service, known as ROS, using the electronic eRCT system. There is no modern paper-based route for ordinary compliance. If you are operating in Ireland and have not set up ROS access, that is the first practical hurdle.
For the wider context of operating across the border, our piece on setting up a company in both the UK and Ireland covers the structural questions, and our guide to VAT compliance for businesses operating across the UK to Ireland border covers the indirect tax side that sits alongside RCT.
RCT operates at 3 deduction rates. Which rate applies depends on the subcontractor’s registration and tax compliance position with Revenue.
| RCT rate | Who it applies to | Cash flow effect |
|---|---|---|
| 0% | Subcontractors with a strong Irish tax compliance record | Paid gross, with no RCT deduction |
| 20% | Registered subcontractors meeting Revenue’s basic compliance requirements | One fifth of the payment is withheld |
| 35% | Unregistered or non-compliant subcontractors | More than a third of the payment is withheld |
For a UK contractor newly entering the Irish market, the problem is obvious. You may have a strong UK compliance record, but Revenue may not yet have an Irish tax history for you. If you are properly registered, you may start at 20%. If you are not registered or your Irish compliance position is not in order, the 35% rate may apply.
On a €200,000 contract, that means €40,000 may be withheld at 20%, or €70,000 at 35%.
The withheld amount is not necessarily lost. It is a credit against your eventual Irish tax liability, and a registered subcontractor may be able to reclaim excess RCT. But the timing gap between deduction and refund is where the cash flow damage happens. Our article on how recovery accountants help improve cash flow covers the broader discipline of managing this kind of working capital pressure.
Imagine you win a €300,000 contract in Ireland. You are new to Revenue and are placed on the 20% RCT rate. As you invoice through the project, the principal withholds 20% from each payment and accounts for it to Revenue.
Across the contract, you receive €240,000 in cash while €60,000 sits with Revenue.
Meanwhile, you still need to pay staff, subcontractors, materials, travel, equipment hire, insurance and overheads. The €60,000 withheld may be recoverable later, but you cannot use it to fund the job while the work is ongoing.
For contractors working on tight margins, that timing gap can turn a profitable project into a cash flow problem. Our guides on the key financial KPIs every SME owner should be monitoring monthly and how management accounts help SME owners explain why visibility matters before you take on a cross-border contract.
The good news is that the position can improve. Once you have built a clean Irish tax compliance record, you may be able to move towards the 0% RCT rate. The planning task is to get registered properly, stay compliant and manage the cash flow impact while your Irish record is being established.
If you are the UK contractor acting as principal, and you subcontract work in Ireland, the compliance obligations sit with you.
The process normally works like this:
The important point is that a deduction authorisation is needed before each relevant payment. It is not enough to check a subcontractor once and then continue paying them across the job.
If you make a payment without obtaining the correct deduction authorisation, you may become liable for penalties. The penalty depends on the subcontractor’s RCT rate: 3% of the payment where the 0% rate should have applied, 10% where the 20% rate should have applied, 20% where the 35% rate should have applied, and 35% where the subcontractor is unknown to Revenue.
Revenue enforces the regime strictly. “I did not realise” is not a safe position. Our guides on common tax mistakes expats and cross-border businesses make and how tax accountants help small businesses cover the process discipline that keeps businesses out of avoidable tax trouble.
RCT does not travel alone. Construction services that fall within RCT are generally subject to the Irish VAT reverse charge between principal and subcontractor.
Under the reverse charge, the subcontractor does not charge VAT on the relevant construction service. Instead, the principal accounts for the VAT through its own VAT return and claims an input credit where entitled.
In practice:
Most qualifying construction services in Ireland are subject to the 13.5% reduced VAT rate, but some supplies can fall under the 23% standard rate or other rules. Classification matters, especially where a contract includes goods, plant, professional services or non-construction elements.
Our guide to VAT compliance for businesses operating across the UK to Ireland border goes deeper on the indirect tax picture. For digital filing obligations on the UK side, our pieces on Making Tax Digital explained and Making Tax Digital and what UK and Irish businesses need to know are useful companion reads.
If you know CIS, the temptation is to assume RCT works in the same way. It does not.
| Feature | UK CIS | Irish RCT |
|---|---|---|
| Sectors covered | Construction | Construction, forestry and meat processing |
| Deduction rates | 0%, 20% and 30% | 0%, 20% and 35% |
| Filing system | CIS monthly returns | eRCT through ROS |
| Payment authorisation | Subcontractor verification and monthly reporting | Deduction authorisation before each payment |
| Nil returns | Mandatory again from 6 April 2026 unless inactivity is notified | No direct equivalent, but contract and payment notifications apply |
| VAT interaction | UK domestic reverse charge where conditions apply | Irish reverse charge tied to RCT construction services |
| Residence | UK scheme | Applies where relevant operations are carried out in Ireland |
The biggest operational difference is the deduction authorisation. Under CIS, once a subcontractor’s status is verified, you manage deductions and returns through the UK monthly return cycle. Under RCT, you need a payment notification and deduction authorisation for each relevant payment.
The other trap is the 35% top rate, which is higher than the UK’s 30% CIS rate. Non-compliance, not just non-registration, can push a subcontractor into the highest rate.
Our companion article on the changes to the Construction Industry Scheme from April 2026 covers how the UK regime is tightening at the same time, which matters if you operate on both sides of the border.
The single most valuable thing a UK subcontractor working in Ireland can do for cash flow is build towards the 0% RCT rate. At 0%, you are paid gross and the withholding problem disappears.
To get there, you generally need:
A new entrant should not assume they will get 0% immediately. The realistic path is to register correctly, operate cleanly, file on time and apply for a rate review once your compliance record supports it.
This is where coordinated advice pays for itself. Experienced Cross-border tax advisors can manage your RCT, VAT and corporation tax position together rather than treating them as disconnected issues. Our articles on cross-border payroll and tax planning for UK businesses expanding overseas cover related cross-border planning points.
If you are a non-resident subcontractor and RCT has been withheld, you may be able to apply for a refund during the year rather than waiting for the annual return process.
The International Claims Section in Nenagh deals with non-resident refund applications. The process usually involves:
This route helps, but it is still administrative. It is not a same-week cash recovery tool. A realistic cash flow forecast should assume that withheld RCT may be tied up for months rather than days.
Our piece on switching to cloud accounting for SMEs covers the systems that make tracking withheld RCT, refund claims and project cash flow much easier.
RCT is a withholding mechanism. It is not necessarily your final Irish tax bill.
The bigger question for a UK contractor doing sustained work in Ireland is whether the activity creates a permanent establishment there. If it does, Irish corporation tax may apply to the profits attributable to the Irish activity.
A UK company may create an Irish permanent establishment where it has a fixed place of business in Ireland, or where people habitually conclude contracts there on its behalf. The facts matter. Site duration, project structure, contract authority, staffing and the UK-Ireland tax treaty all need to be considered.
Getting this wrong is costly in either direction. Assume no permanent establishment when one exists and you may face back taxes, interest and penalties. Assume one exists when it does not and you may over-comply, tie up resources and complicate reporting unnecessarily.
Our Cross-border tax accounting team handles this kind of analysis, and our pieces on how to prepare your business for sale and due diligence and its importance in business explain why clean cross-border tax records matter when a business later faces lender, investor or buyer scrutiny.
If you are a UK contractor about to take on Irish work, work through this checklist before the first invoice:
This is the kind of pre-engagement review our team runs for UK contractors heading into Ireland. Our specialist tax and tax compliance teams handle the RCT, VAT and corporation tax strands, our digital bookkeeping team gets the records and ROS interaction working, and our SME business solutions team keeps the cash flow picture joined up.
Most RCT problems are administrative and fixable with good process. Some escalate into Revenue interventions, particularly where RCT was not operated, deduction authorisations were missed, the reverse charge was applied incorrectly, or there is a dispute in the contract chain about responsibility.
Where a Revenue intervention turns into a formal dispute, the quality of evidence matters. You may need to reconstruct payment records, contracts, invoices, deduction authorisations, VAT treatment and correspondence.
Our forensic accountant team can help rebuild the financial position from primary records and present it clearly. Our pieces on what a forensic accountant does and when you need one, forensic accounting vs audit, how forensic accounting helps in fraud investigations and forensic accounting in shareholder and partnership disputes explain the wider role this work can play.
If RCT cash flow pressure, combined with wider construction cost pressure, pushes a contractor towards genuine financial difficulty, early support matters. Our company recovery accountants work with businesses facing cash flow stress, and our guides on what an insolvency accountant does in business distress cases and what happens to creditors during company insolvency explain where this advice fits. For fraud and control concerns, our red flags of financial fraud in SMEs piece is also worth reading.
For a UK contractor operating across the border, RCT is only one part of the picture. Keep these wider 2026 points in view:
For owner-managed contracting businesses, our pieces on protecting the family business with a family charter, the future of financial planning and why internal audit supports business growth are worth reading.
For businesses approaching a sale or seeking investment, the indispensable role of chartered accountants in mergers and acquisitions, what to expect during an external audit and how a quality external audit strengthens trust with lenders and investors cover the assurance angle.
For directors filing personally, our self-assessment tax returns guide for self-employed individuals in the UK and Ireland is the relevant starting point.
Yes. RCT can apply to construction, forestry and meat processing work carried out in Ireland, regardless of the residence of the contractor or subcontractor. UK residence does not provide an exemption.
The rates are 0%, 20% and 35%. The rate depends on the subcontractor’s RCT registration and Irish tax compliance position with Revenue.
RCT is operated through ROS using eRCT, covers more sectors than CIS, has a 35% top rate and requires a deduction authorisation before each relevant payment. CIS works through the UK monthly return process and uses different verification rules.
Where a construction service is within RCT, the subcontractor generally does not charge VAT to the principal. The principal self-accounts for VAT through its own VAT return, usually at 13.5% for qualifying construction services.
Yes, where the RCT withheld exceeds your Irish tax liability or where a non-resident refund claim is available. Registered non-resident subcontractors may be able to apply for refunds during the year using the relevant Revenue forms and contract questionnaires.
You need proper registration, a clean Irish compliance record, timely filing of returns and no outstanding Irish tax liabilities. New entrants should not assume they will receive 0% immediately.
It might. If your UK company has a fixed place of business in Ireland or people habitually concluding contracts there, it may create a permanent establishment. This should be reviewed before taking on sustained Irish work.
If you are a UK contractor taking on work in Ireland, the time to sort out your RCT position is before you start, not after the first payment comes up short.
This is the kind of cross-border construction tax work our team handles regularly, joining up RCT, VAT and corporation tax so your cash flow is protected and your compliance record is built deliberately from day one.
As chartered accountants Northern Ireland, wider UK and Ireland construction businesses rely on, SCC Chartered Accountants understands both tax systems and the way they interact for contractors moving across the border.
Our Cross-border tax accounting team leads the work, supported by our specialist tax, tax compliance and corporate finance teams as your project requires.
Get in touch with the SCC team for an RCT and cash flow review before you take on your next Irish contract.
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