VAT Registration in Ireland: When Must You Register?

VAT in Ireland trips up more founders than any other tax. The thresholds are surprisingly low, the rules around services-vs-goods are subtle, and registering at the wrong time can cost you real money — either by registering too early and adding 23% to your prices, or registering too late and owing back-VAT plus penalties.

This guide explains exactly when you must register, when you might want to anyway, and what changes once you do.

The thresholds

Revenue says VAT registration is obligatory when your annual turnover exceeds the VAT thresholds, and that turnover is calculated over a calendar year, excluding VAT. It counts supplies of taxable goods and services, supplies of immovable goods, certain financial transactions and insurance services. It leaves out one-off sales of business assets, such as selling a delivery van.

Revenue's registration manual says a registration can be backdated only where annual turnover has exceeded the threshold, so track your turnover through the year rather than waiting for the year to end. When you apply, Revenue asks for your turnover from 1 January to the date of application and your turnover for the previous calendar year (Revenue Tax and Duty Manual Part 38-01-03b).

Services vs goods — why it matters

The €42,500 services threshold is much lower than the €85,000 goods threshold. Most founders running consultancies, agencies, SaaS businesses or freelance practices hit it within 6–12 months of trading.

Some businesses are clearly one or the other:

• A web design agency = services
• An e-commerce shop selling t-shirts = goods

Others are mixed. A SaaS business selling a digital product is generally treated as services. A business selling physical hardware bundled with software services may need to apportion.

If you supply both goods and services, the €85,000 threshold applies only when 90% or more of your turnover is from goods. Otherwise the lower €42,500 threshold applies.

Distance selling — the €10,000 trap

The €10,000 threshold applies to taxable persons making mail-order or intra-Community distance sales of goods, and cross-border digital services (telecommunications, broadcasting and electronic services), into Ireland. It is calculated using your total sales of these to consumers in all EU Member States, and Revenue says it only applies where the supplier is established in one Member State. Otherwise the supplier must register for Irish VAT for those supplies.

That means a UK business selling these goods or services to Irish consumers does not get the €10,000 threshold. Check Revenue's guidance on the EU VAT SME scheme and registration for non-established traders before you start selling.

Voluntary registration

You can register voluntarily below the threshold. Pros and cons:

Pros:

• Reclaim input VAT on business purchases (rent, software, professional fees, equipment)
• B2B customers don't care about VAT — they reclaim it
• Looks more "real" if you're invoicing big businesses

Cons:

• 23% added to prices for B2C customers (most bear this — you can't pass it on)
• Quarterly or bi-monthly returns to file (admin overhead)
• Cash flow timing issues (you collect VAT, then remit it 1–2 months later)

Rule of thumb: if more than 70% of your customers are VAT-registered businesses, voluntary registration almost always pays. If most are consumers, hold off until you must.

What rates to charge

Charging the wrong rate is one of the most common Revenue audit findings. If you're unsure, the Revenue VAT rates database has searchable per-product rulings.

Filing returns

Once registered, you file bi-monthly VAT returns by default (Jan-Feb, Mar-Apr, etc.). Each return is due by the 19th of the month after the period (23rd if you file via ROS).

You can apply to file:

• Quarterly if your annual liability is under €3,001
• Annual if under €5,001 (admin liability — most businesses prefer bi-monthly)

You also file an Annual Return of Trading Details (RTD) that summarises sales and purchases by VAT rate. Due 23 days after your accounting period end.

Reverse charge — the most missed rule

If you buy services from a non-Irish EU business (or a business outside the EU), the reverse charge mechanism applies. The supplier doesn't charge VAT; you account for it both as output VAT (T1) and input VAT (T2) on the same return — net zero, but it must be declared.

Common reverse-charge scenarios:

• Buying software from a US SaaS provider (Adobe, AWS, Stripe — they don't charge Irish VAT)
• Hiring a UK consultant
• Paying Google or Meta for advertising

Forgetting to reverse charge is the #1 finding in Revenue audits of small Irish businesses. AccountsOS detects these from supplier names automatically.

How to register

Registration is via ROS:

1. Sign in with your digital cert (or your accountant's)
2. Go to "Manage Tax Registrations"
3. Choose "VAT" and complete the application (TR1 for individuals, TR2 for companies)
4. Provide expected turnover, types of supply, and your Irish-resident bank account
5. Revenue typically issues your VAT number within 5–10 working days

You can ask Revenue to backdate registration to your trading start date if you missed a threshold breach. You'll owe back-VAT, but you can also reclaim input VAT for the same period.

After you register

Day-to-day VAT obligations:

• Issue VAT invoices showing your VAT number, rate, net, VAT and gross
• Keep VAT records for at least 6 years
• File bi-monthly VAT3 returns via ROS
• File annual RTD
• Pay by direct debit or bank transfer through ROS

A direct debit arrangement spreads the bi-monthly liability across 12 equal monthly debits — useful for cash flow.

Penalties for not registering

If you should have registered and didn't:

• Back-VAT owed from the date you should have registered
• Daily interest at approximately 8% per year on unpaid VAT
• Penalties up to 100% of the VAT due if Revenue treats it as deliberate default
• VAT registration backdated by Revenue (you owe the historic VAT and may not be able to bill customers for it)

Don't be the founder who finds out at audit. Track turnover monthly.

How AccountsOS helps

AccountsOS is live in Ireland and tracks your turnover against the thresholds automatically. As you approach either threshold, Finn raises a flag with a link to the registration form. Once registered, the platform:

• Categorises every transaction by VAT rate
• Flags reverse-charge purchases automatically
• Generates the bi-monthly VAT3 return
• Prepares the annual RTD
• Files directly to ROS (subject to ROS API access — manual upload for now)

Try AccountsOS free or read about AccountsOS in Ireland.

Related reading

• Corporation Tax in Ireland: 2026 guide
• Setting up an Irish Limited Company
• PAYE, PRSI and USC explained