A Northern Ireland contractor quoting work in Dundalk needs to know more than the travel time and materials cost. The office also needs to establish whether the customer will deduct Relevant Contracts Tax (RCT), who will account for Irish VAT and whether an Irish registration is required.

Those answers affect the invoice and the amount arriving in the bank. Establish them while reviewing the contract, before committing to a payment schedule your business may struggle to fund.

This article focuses on Northern Ireland contractors undertaking construction-related work in the Republic of Ireland. We make Fieldmotion, which supports job information and records. The guidance is educational, not individual tax advice. Have a qualified adviser check the contract, parties and registrations before applying a treatment.

Check the Work and Customer Before Deciding the Tax Treatment

Identify the supply, property location and customer’s role separately. “Maintenance in Ireland” is too broad a description to decide either RCT or VAT. Ask for the scope of work and record who is contracting with whom.

Establish Whether the Service Relates Directly to Property

For services directly related to land or a building, the VAT place of supply is where the property is located. HMRC’s place-of-supply guidance explains this rule and distinguishes it from services involving equipment that does not form part of the building.

Do not extend that rule to every service simply because a technician crosses the border. Contracts involving installed goods, movable equipment or several kinds of supply need their own classification. Your UK VAT registration alone does not settle the Irish treatment.

Confirm the Customer’s Role

RCT concerns relevant contracts between a principal contractor and subcontractor. A commercial address or an “FM” description on the customer account does not establish that relationship. Confirm the actual role and work with your adviser.

Record that decision in the quote file. Fieldmotion’s quoting tools support preparing a proposal from captured job information. Our guide to quoting field service work covers the scope and approvals needed before pricing. Have the tax classification reviewed separately.

When RCT Applies to a Northern Ireland Contractor

RCT can apply to a Northern Ireland business subcontracting relevant construction operations in the Republic. Being based outside the State does not, by itself, remove the obligation. The work and contractual relationship still need to fall within the rules.

Revenue’s RCT overview identifies relevant operations and confirms the three deduction rates: 0%, 20% and 35%. Its construction list includes installing, altering or repairing specified building systems. Do not assume every routine service visit has the same classification.

The principal must obtain the payment authorisation through Revenue’s process before making the relevant payment. Use the authorised deduction for that payment. Do not assume a rate because the subcontractor is new, UK-based or received a particular rate on a previous job.

At 0%, the notification and authorisation process still matters even though no deduction is taken. For background terminology, our RCT guide explains the principal and subcontractor relationship. Confirm the position for your contract against Revenue’s current guidance.

Who Accounts for Irish VAT?

The Irish construction reverse charge makes the principal account for VAT on qualifying construction services supplied by a subcontractor. The subcontractor does not collect that VAT from the principal. VAT remains due under this arrangement; responsibility for accounting for it moves to the principal.

Qualifying Work for a Principal Contractor

Revenue’s guidance on non-established builders and subcontractors says non-established subcontractors supplying only these services to principals are not obliged to register for VAT. Revenue says registration is required for the purpose of reclaiming VAT. Ask your adviser to confirm the appropriate route for any Irish VAT you want to recover.

The principal’s ability to deduct the VAT it accounts for depends on its entitlement. Do not promise a customer that the reverse charge will always have no net tax cost for them.

Construction Work Outside RCT

Revenue also states that non-established traders providing construction services in the State outside RCT must register and account for Irish VAT. Its examples include a builder extending a private individual’s home. Do not assume you can use the subcontractor treatment for a homeowner’s job.

A business can have different treatments across its contracts. Keep the decision at job level instead of applying one customer-account default to every invoice. Our Irish VAT guide provides background; check your specific non-established position rather than borrowing assumptions for an Irish-established business.

What Belongs on the Construction Reverse-Charge Invoice?

Use an invoice format approved for the actual construction supply and your registration position. A standard UK invoice with the VAT line deleted may omit information needed for the Irish transaction.

The revised VAT Consolidation Act, section 66(4) requires the document for the construction services it covers to indicate that the principal accounts for the VAT. It calls for the other applicable invoice particulars, while excluding both the VAT rate and the VAT amount.

That subsection addresses a subcontractor who is an accountable person. If you are not Irish-VAT registered, confirm the applicable document requirements with your adviser. Never add a VAT registration number you do not have.

For the statement identifying responsibility, a clear formulation is: “VAT on this supply to be accounted for by the principal contractor.” Have the complete template checked, including the references and registration details applicable to your business. Do not rely on a generic reverse-charge label to explain the transaction.

Keep the service description consistent with the contract and job card. Where the scope changes, obtain a review of the new supply. Do not assume separately listing materials automatically determines their VAT treatment or that the reverse charge covers everything on a mixed invoice.

What Reaches Your Bank Account: A Worked Example

The following hypothetical example shows one payment. Assume the parties have confirmed that RCT and the construction reverse charge apply, and Revenue has authorised a 20% RCT deduction for that payment. Other charges, retention and contractual adjustments are excluded.

Revenue states that RCT is calculated on the VAT-exclusive amount in this situation. The principal accounts for the VAT separately; it does not add that VAT to the €8,000 paid to the subcontractor.

The €2,000 deduction affects available cash while the subcontractor’s tax position and any repayment are dealt with. It is not automatically an additional €2,000 tax cost or a guaranteed €2,000 refund. Budget for the actual authorised deduction and have your adviser establish the credit or repayment position.

Use the same method for each payment in the forecast. The 20% here is an assumption for arithmetic, not a starting rate for a new Northern Ireland contractor.

Keeping the Evidence for RCT Credits and Refunds

Keep the payment record and deduction authorisation together so finance can reconcile the invoice, bank receipt and tax withheld. Ask the principal for the deduction documentation instead of treating a short bank receipt as sufficient evidence of RCT.

Revenue’s non-resident subcontractor guidance says registered subcontractors can apply for an RCT refund during the year through its International Claims Section in Nenagh. It identifies Form IC1 for individuals, Form IC3 for companies, and an RCT questionnaire for each contract accepted.

Revenue requires the residence-country tax authority to certify the IC1 or IC3 in the year the income was earned. It also requires a copy of the deduction authorisation. Check the current forms and your eligibility with your adviser before submitting a claim.

Keep supporting contracts, invoices and site records retrievable too. Do not put an assumed repayment date into the cash-flow forecast as a confirmed receipt. Agree the route and evidence first, then update the forecast as the claim progresses.

Get the Office Handover Right Before Work Starts

Give the person pricing the job and the person invoicing it the same reviewed instructions. The job file should identify:

• The work: Agreed scope, supply classification and any exclusions requiring further review.

• The parties: Contracting entities, actual site address and relevant principal/subcontractor roles.

• The tax decision: RCT position, VAT accounting responsibility, registration requirements and the adviser’s confirmation.

• The payment process: Terms, expected cash receipts and responsibility for obtaining each deduction authorisation.

• The evidence: Contract, invoice template, payment records and documents needed for any claim.

If the customer adds work, send the change through the same review. The process for reporting additional work helps distinguish an engineer’s finding from an approved variation; neither should silently inherit a tax treatment that was agreed for a different scope.

Fieldmotion supports job forms and supporting records. Teams can capture site information using the mobile app, including offline capture. Newly recorded offline information must synchronise before the office can see it. Keep your reviewed tax instructions accessible alongside the contract.

Check what your proposed setup handles in the job system, accounting package and Revenue processes. Do not assume a site address or currency setting calculates RCT, submits notifications or determines VAT automatically. If you are changing job software, include the supporting tax documents in your migration checks.

Frequently Asked Questions About Cross-Border RCT and VAT

Does Every Job in the Republic Fall Within RCT?

No. Check the relevant operations and principal/subcontractor relationship. A job’s location does not establish every RCT condition. Describe the actual work to your adviser, particularly where a maintenance contract includes inspections, repairs, installation or other activities with different classifications.

Will a New Northern Ireland Contractor Automatically Face 20% RCT?

Do not assume that rate. Revenue operates 0%, 20% and 35%, and the principal must follow the authorisation for the payment. Confirm your registration and compliance position before forecasting receipts. Use an assumed rate only when it is clearly labelled as a planning scenario.

Does a 0% RCT Rate Remove the VAT Reverse Charge?

No. A 0% deduction does not, by itself, change who accounts for VAT on a qualifying construction supply. The RCT payment process still applies. Review RCT withholding and VAT accounting as separate decisions, even where both arise from the same contract.

Can I Use the Same Invoice for a Principal and a Homeowner?

Do not assume the treatment is the same. Revenue distinguishes qualifying subcontract construction services from construction services outside RCT supplied by a non-established trader. Confirm the recipient’s role, your registration obligations and the required invoice format before billing each job.

Is Withheld RCT Guaranteed to Come Back in Full?

No. Establish the credit or repayment position against your actual tax circumstances and the claim requirements. Keep deduction authorisations and reconcile them with payments. This article does not promise a refund amount or processing time; your adviser should confirm what you can claim.

Does This Explain Contractors Working From the Republic Into Northern Ireland?

No. This article focuses on Northern Ireland businesses taking relevant work in the Republic. Work in the other direction needs a separate review of UK obligations. Do not reverse the examples and assume Irish RCT and VAT procedures apply to a Northern Ireland site.