Your Irish LTD has won a renovation contract and plans to engage an electrician or plasterer. You may think of the company as a subcontractor because a larger contractor pays it. For the work it passes on, however, the company may also have a principal contractor's tax responsibilities. The outgoing payment needs its own review.
This guide is for an owner-managed company preparing to hire construction subcontractors, not a complete treatment of every RCT sector or property transaction. It separates registration from the payment-by-payment work that follows. Revenue guidance was checked on 6 November 2026; obtain advice on the actual contracts and working arrangements before committing to a tax treatment.
1. Start with the work and the contracting parties
RCT applies to specified payments in construction, forestry and meat processing, not to every supplier invoice or everyone described as a contractor. Revenue lists construction operations including building and repair, certain installed systems and work integral to a construction project. Buying a generic business service does not become an RCT transaction just because your company operates in construction.
Prepare a short contract map before asking for registration: who is promising what work, to whom, and who pays whom? Identify the legal entity on each agreement rather than relying on a site nickname or a trading name shared with an older business. Keep separate lines for your company's customer, its subcontractor and any employees.
For example, an LTD engaged to carry out electrical work may itself subcontract part of that installation. Revenue's principal-contractor manual specifically addresses this onward-subcontracting situation. The company can have an incoming subcontractor role and an outgoing principal role on the same project.
2. Do not treat an ordinary premises fit-out as an automatic trigger
The fact that a company pays a builder is not, by itself, a complete principal-contractor test. Revenue describes an own-use exception where the only construction involvement concerns buildings or land for the business's own use or its employees' use. Connected companies, development activity and the actual purpose of the property can complicate that analysis.
Compare two fictional situations. A software company commissions work on its own office; a building company contracts to refurbish a customer's premises and passes the plumbing work to another business. Do not give both companies the same registration answer solely because both receive a plumber's invoice. Explain the ownership, use, business activities and contract chain to the adviser.
Treat this comparison as a question to investigate, not an exemption certificate. In a group structure, disclose the connected businesses and any intended letting, sale or development. Resolve the position before instructing the bookkeeper to exclude the work from RCT.
3. Review individual workers before selecting RCT instead of payroll
When you engage an individual, calling the person self-employed, accepting an invoice or obtaining an RCT reference does not settle employment status. Revenue's current guidance uses the Karshan five-step framework, considering remuneration, personal service, control, the overall relationship and the relevant legislative context. RCT is not a payroll opt-out.
Write down how the work will actually operate. Who determines attendance and methods? Can someone else perform the work? Who quotes for the job, supplies substantial equipment, bears the cost of defects and takes commercial risk? Do not turn these into a points-based test in which one favourable answer guarantees self-employment.
If the arrangement is uncertain, request a specific classification review before work starts. Keep the written contract and evidence of actual practice together, and revisit the assessment when working arrangements change. Revenue distinguishes individual engagements from services supplied through companies; do not mechanically apply an individual-worker checklist as a reason to ignore an incorporated supplier's legal identity.
4. Arrange principal registration, not just a tax number
Revenue's principal-contractor manual states that someone becoming a principal must formally notify Revenue within 21 days of entering the first relevant contract. That period is not permission to make undocumented payments meanwhile. Plan the registration and notification arrangements before the first payment falls due.
ROS eRegistration includes RCT, but Revenue lists companies with no Irish-resident directors among customers not eligible for that facility. An Irish registered office is not an Irish-resident director. If the online route is unavailable, establish the appropriate company registration form and submission route with the adviser rather than changing factual answers to force access.
Confirm that the registration reflects the company and the relevant principal role. A CRO incorporation certificate, an individual's old tax number or evidence that the LTD receives payments subject to RCT is not a substitute for checking the company's outgoing-payment obligations. Retain the resulting confirmation and review the registration status.
5. Agree who will operate ROS before the first invoice arrives
Registration is a setup task; operating RCT is a continuing workflow. ROS allows registration management and agent nomination, and a registration status certificate can help verify the tax heads recorded for the business. Ask who will perform each action, who will review it and what evidence will be returned to the company.
Give the payment approver a practical handoff rule: an invoice is not released merely because a supplier has been added to the accounts system. The person preparing payment should know which records must be checked and whom to contact when something is missing. Agree cover for holidays, site absences and last-minute payment requests.
Do not share a director's private login or digital-certificate password as an informal substitute for proper access arrangements. Discuss the authorised company-user or agent route. Keep a named responsibility list accessible to the director without leaving identity evidence, bank instructions or tax references in an unrestricted site messaging group.
6. Separate the contract record from permission to pay
Revenue expects contract notification immediately after entering a relevant contract, with retained evidence of the subcontractor's identity. Its required details include the recorded name and tax reference, work, location, dates and estimated value. The site's SIN links the relevant project records; check it when work is further subcontracted.
Before a relevant payment, notify its gross amount and payment date. Revenue then provides the deduction authorisation specifying the tax, if any, to withhold. A supplier's assertion that it is on a zero rate is not the authorisation for your payment.
Build a short release pack: the correct contract reference, invoice or payment certificate, intended amount and date, current authorisation, deduction calculation and independently verified payment instructions. If the payment changes, establish the necessary notification correction before release. Do not reuse an old authorisation simply because the subcontractor and bank account are unchanged; authorisations are tied to the relevant payment and have validity limits.
7. Reconcile cash paid and tax withheld as two obligations
Consider an invented payment of EUR 5,000 for relevant construction services, assuming the construction VAT reverse charge applies and there are no retentions or other adjustments. If the valid authorisation requires a 20% deduction, EUR 1,000 is withheld and EUR 4,000 goes to the subcontractor. The withheld amount remains an obligation to Revenue, not spare working capital.
At a zero deduction, the full EUR 5,000 would go to the subcontractor, but the contract and payment reporting still matter. Neither the LTD nor its formation provider chooses the supplier's rate. Revenue's current RCT rates are 0%, 20% and 35%; use the authorisation actually issued rather than budgeting on a hoped-for outcome.
Have the bookkeeper link the invoice, bank payment and deduction record so that a smaller bank transfer is not mistaken for a supplier discount. Ask the subcontractor to acknowledge any commercial discrepancy, but do not alter Revenue figures just to make an unexplained supplier statement reconcile.
| Payment component | Example at an authorised 20% rate |
|---|---|
| Gross relevant payment | EUR 5,000 |
| RCT withheld | EUR 1,000 |
| Paid to subcontractor | EUR 4,000 |
8. Check construction VAT separately from the RCT percentage
Construction services supplied by a subcontractor to a principal, where RCT must operate, generally use the construction VAT reverse charge. The principal accounts for VAT rather than paying that VAT to the subcontractor. Revenue also requires principals receiving those construction services to register and account for VAT irrespective of turnover; do not rely only on the ordinary small-business threshold.
In the example above, assess the VAT accounting on the full EUR 5,000 consideration, not merely the EUR 4,000 cash transferred. Any input deduction depends on entitlement. An RCT rate of 0% does not mean the construction supply is zero-rated for VAT, and a withholding percentage is not the VAT rate.
Give the accountant the actual invoice, service description and customer chain. Different jobs within one business can have different VAT treatment, especially work billed to a private homeowner versus qualifying subcontracted construction. Do not copy a reverse-charge label onto every invoice or assume that an RCT registration resolves all VAT questions.
9. Close the return period and deal with mistakes promptly
Revenue generates a monthly or quarterly deduction summary from payment notifications. Check it against the records: a correct summary becomes the return without another submission. Revenue specifies the 23rd of the following month for payment of deductions, with amendments to the summary before the 23rd. Put the applicable period and review arrangements in the company's calendar.
If a payment has already gone out incorrectly, preserve the real payment date and amount and seek prompt correction advice. Do not backdate an authorisation or quietly delete evidence. Revenue provides post-payment notification procedures, including for technical difficulties, but these are not an elective replacement for the normal pre-payment process.
Penalties can arise even where the subcontractor has a 0% rate. Revenue's published table lists 3% of the relevant payment for that category, with higher percentages for other or unknown statuses. A zero withholding result therefore does not make an unreported payment harmless. Discuss the particular facts, notice and correction route instead of assuming that a later registration cancels past failures.
10. Take a defined brief to the registration provider
Prepare the information below before ordering. A useful brief explains the transaction, not just 'please add RCT'. If contracts have already started or money has been paid, highlight that immediately and separate historical correction work from the future registration application.
StartCompany.ie's Tax Registration service lists RCT where applicable, alongside other relevant tax heads and ROS setup support. Review the existing service page for current inclusions and total payable. Confirm whether assessing principal status, employment classification, connected-party arrangements, VAT treatment or earlier payments requires a separate engagement.
Also agree who will handle each future contract notification, payment notification, deduction-summary review and remittance. Do not assume a registration order includes unlimited ongoing operation of RCT. Revenue determines registration and tax outcomes; buying support does not guarantee a zero deduction rate, erase penalties or make a disputed worker classification correct.
- Company identity and current Revenue registration status, including whether it already receives RCT payments.
- Customer-to-company-to-subcontractor contract map, scope of work, site details and expected start and payment dates.
- Subcontractor entity details, securely held identity evidence and any unresolved individual-worker classification question.
- Existing contracts, payments, notifications, authorisations and Revenue correspondence, if any.
- Named ROS operator, payment approver, backup contact and agreed scope for ongoing returns and corrections.
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Official information and next steps
Official Revenue sources checked on 6 November 2026. The principal-status manual was updated in February 2026, employment-status guidance in May 2026, construction VAT guidance in August 2026 and the eRegistration page on 27 October 2026. Examples and operational checklists are original hypotheticals, not a Revenue ruling, tax calculation for your company or legal advice. Check current guidance and the actual contract before acting.
- Revenue: RCT overview and covered operations
- Revenue: principal contractors and employment status
- Revenue manual 18-02-02: who is a principal contractor
- Revenue: eRegistration eligibility and alternative forms
- Revenue: managing tax registrations and status certificates in ROS
- Revenue: contract notifications, payment notifications and returns
- Revenue manual 18-02-04: principal registration and deduction authorisations
- Revenue manual 05-01-30: determining employment status for tax
- Revenue: VAT treatment of construction services
- Revenue: penalties for unreported relevant payments