Live in Ireland1 of 27 countries

Accounting software for Irish businesses

For limited companies, sole traders and the accountants who look after them. Finn is the AI accountant built into AccountsOS, and it works for Irish limited companies, designated activity companies and sole traders.

  • Data held in the EU
  • Real double-entry ledger
  • No card to start
FinnIreland business
Online
What is my VAT3 for this bi-monthly period, and when do I pay it?
Your September and October VAT3 comes to EUR 5,270: VAT on sales EUR 8,420 minus VAT on purchases EUR 3,150. File and pay through ROS by 23 November. Your July and August payment went out on 23 September and is matched to the bank line.
VAT on sales8,420
VAT on purchases3,150
To pay5,270
Source: Revenue, VAT3 return on ROS

Example figures. Finn answers from your own ledger, with the source beside every number.

Built for you

Three ways Irish businesses use Finn

Sole traders

Sole traders and the Form 11

Irish sole traders file a Form 11 through ROS and pay Class S PRSI and USC on the profit, plus VAT3 returns once registered. Finn keeps the euro books as you go, separates business from personal spending and tells you what is due before you have to ask. You review the figures and file.

  • Form 11 figures built from your ledger
  • Class S PRSI and USC estimates
  • VAT3 tracked against registration limits
€11/monthStart free
Limited companies

Ltd, DAC and CLG companies

Finn prepares the figures for your CT1 at 12.5% on trading income and 25% on passive income, keeps the bi-monthly VAT3 ready, and tracks your Annual Return Date so the B1 is never a surprise. Payroll runs in real time, so Finn watches each PAYE liability as it builds.

  • CT1 and preliminary tax dates tracked
  • Bi-monthly VAT3 prepared for ROS
  • B1 timed to your Annual Return Date
€22/monthStart free
Accountants

Run your client book on Finn

Irish accountants and tax agents can run the whole client book on Finn. Finn works as a colleague on your team and does the production work: bank lines, receipts, VAT3 figures and payroll liabilities. You review and sign. Allocate each client to a team member, see every client's deadlines in one list, and bring books in by CSV.

  • Every client's deadlines in one list
  • Clients allocated to named staff
  • Migrate client books by CSV
Flat price per live clientFor accountants
Yes, AccountsOS is live in Ireland. Finn knows Revenue (Revenue Commissioners), Companies Registration Office (CRO) and EUR (€), and supports Private Company Limited by Shares (LTD), Designated Activity Company (DAC), Company Limited by Guarantee (CLG) entities out of the box, with tax figures always cited to an official source.
Your Irish tax year at a glance

Every deadline Finn tracks

All deadlines with sources
  • 23 OctMonthly PAYE liabilityPay through ROS
  • 23 NovVAT3 Sep-OctReturn and payment
  • 23 JanVAT3 Nov-Dec and RTDRTD for Dec year end
  • 23 MarVAT3 Jan-FebReturn and payment
  • 23 MayVAT3 Mar-AprReturn and payment
  • 23 SepCT1 Corporation TaxDec year end, via ROS
23%VAT standard13.5% and 9% reduced
12.5%Corporation TaxOn trading income
25%CT passiveRent and investments
EUR 85kVAT thresholdGoods, EUR 42.5k services
4.1%Class S PRSIMinimum EUR 650 a year

Rates from Revenue (Revenue Commissioners), checked 2026-09-30. Finn cites the page it used every time it quotes one.

Bookkeeping software for Ireland: bank feeds, receipts and the euro ledger

Finn keeps your books in euro and dates in the day, month, year format. You bring your bank activity in by uploading a CSV or PDF statement, or by connecting Mercury, Wise, Stripe or Revolut if you use them. Finn categorises each transaction using the context of your business, including your open invoices and recent activity, and flags anything it is unsure about instead of guessing.

Receipts do not need filing by hand. Forward a receipt by email, or send a photo by WhatsApp, Telegram or Slack, and Finn reads it, links it to the matching bank line and records the VAT. At month end Finn reviews the ledger, raises exceptions, and you clear them before locking the period.

  • Categorises bank lines using your own business context
  • Matches receipts and invoices to payments
  • Records VAT at the right Irish rate on each purchase
  • Flags unclear items for you to review rather than posting them blindly
23 OctThe Monthly PAYE liability lands on 23 Oct. Finn puts it on your calendar and reminds you ahead of it.

Irish VAT return software: the VAT3, rates and filing rhythm

Ireland charges VAT at 23% as the standard rate, with 13.5% for things like building services, 9% for a second reduced rate, 4.8% for livestock and 0% for exports and certain goods. The default filing period is bi-monthly, six returns a year, with the VAT3 and payment due by the 23rd of the month after the period ends when you file through ROS.

Finn tracks your VAT by period, prepares the figures for each VAT3 and tells you the amount due. Registration is required when turnover passes or is expected to pass 85,000 euro for goods or 42,500 euro for services in a 12-month period. Smaller businesses can apply for annual or four-monthly filing, and every registered business files the annual Return of Trading Details (RTD).

  • Prepares VAT3 figures for each bi-monthly period
  • Watches your turnover against the registration thresholds
  • Handles reverse charge on EU services you buy
  • Reminds you about the annual RTD

Corporation Tax in Ireland: the CT1, 12.5% and preliminary tax

Irish Corporation Tax is 12.5% on trading income and 25% on non-trading income such as rent and investment income. Finn separates the two in your ledger so the split is ready when it matters. The CT1 return is due within nine months of your accounting period end, by the 23rd of that month when you file and pay through ROS.

Preliminary tax is the part that surprises new companies. A small company pays either the full prior year liability or 90% of the current year liability by the 23rd of the month before year end. Finn works out the estimate, tells you the date, and flags reliefs worth checking, including Start-Up Relief for new trading companies and the 30% R&D tax credit.

Irish payroll, PAYE, PRSI and USC

Irish payroll runs on PAYE Modernisation, which means payroll submissions go to Revenue on or before pay day using each employee's Revenue Payroll Notification (RPN). Each payslip carries PAYE, the Universal Social Charge (USC) and Pay Related Social Insurance (PRSI). From 1 October 2026, employee Class A PRSI is 4.35%, and employer PRSI is 9.15% on weekly earnings up to 552 euro and 11.40% when weekly pay is above that.

Finn keeps the payroll costs in your ledger and tells you what the monthly P30 remittance should be. The P30 is due by the 23rd of the following month when paid through ROS. PRSI and USC rates move with each Budget, so Finn checks its sourced figures and cites Revenue when it quotes them. The submission itself is made through your payroll route.

CRO annual return software: the B1, the ARD and beneficial ownership

The Companies Registration Office (CRO) holds the public record for every Irish company. Each company has an Annual Return Date (ARD), and the Form B1 annual return must be filed within 56 days of it, through CORE. The first return is due six months after incorporation and needs no financial statements. Later returns need the financial statements attached.

Late filing is expensive. The penalty starts at 100 euro and then accrues at 3 euro a day up to a cap of 1,200 euro a year, and two consecutive late returns lose the audit exemption. Finn tracks your ARD, keeps the ledger ready for your financial statements, and reminds you about the Register of Beneficial Ownership, which needs updating within 14 days of a change.

Sole traders and Form 11 in Ireland

If you trade in your own name, your return is the Form 11, due on 31 October after the tax year ends. Filing and paying through ROS extends the date into mid-November, and Revenue confirms the exact day each year. Preliminary tax for the current year and the balance for the prior year fall on the same date.

Self-employed people pay Class S PRSI at 4.35% from 1 October 2026, with a minimum payment of 650 euro, and USC carries an extra 3% surcharge on non-PAYE income above 100,000 euro. Finn keeps your income and expenses in order through the year, so the figures for the Form 11 are ready when you sit down to file.

Switching from Sage, Xero, QuickBooks, Bullet or Surf

Most Irish businesses we talk to are coming from Sage, Xero or QuickBooks, and some from Irish products such as Bullet and Surf. Moving over does not need a project. Export your transactions, contacts and chart of accounts as CSV from the old package and upload them. Finn maps the columns itself, so you do not need a template.

There is no lock-in. Your data stays exportable, and you can keep your accountant in the loop by giving them access. Run the old system alongside AccountsOS for one VAT period if you want to compare the figures before you switch off the old one. Finn also picks up your open invoices and bills, so customers and suppliers carry across with their balances.

Finn at work in Ireland

One accountant, 27 countries, the same ledger

  • Finn flagged a VAT deadline for a business in Dublin
  • Finn categorised a batch of receipts in Cork
  • Finn reconciled the books for a Galway company
See all 27 countries

Irish terms Finn understands

Full glossary
VAT3
The Irish VAT return, normally filed bi-monthly through ROS with payment due by the 23rd of the month after the period.
ROS
Revenue Online Service, the portal where Irish businesses file VAT, Corporation Tax, payroll and income tax returns.
RTD
Return of Trading Details, an annual return showing supplies and purchases at each VAT rate.
CT1
The Corporation Tax return, due within nine months of the accounting period end.
B1
The annual return filed with the CRO, due within 56 days of the Annual Return Date.
ARD
Annual Return Date, the date a company makes up its CRO annual return to.
Switching

Switching from Sage, Xero, QuickBooks, Bullet or Surf

Most Irish businesses we talk to are coming from Sage, Xero or QuickBooks, and some from Irish products such as Bullet and Surf. Moving over does not need a project. Export your transactions, contacts and chart of accounts as CSV from the old package and upload them. Finn maps the columns itself, so you do not need a template.

  1. 01ExportAccounts, contacts, invoices and bank lines as CSV from your current tool.
  2. 02Drop it on FinnFinn reads the columns, maps your chart of accounts and asks only where it is unsure.
  3. 03Opening balancesLast year from your filed accounts, this year live. Reconciled before you rely on it.

Questions Irish founders ask

Is AccountsOS compliant with Revenue and ROS requirements?

Finn prepares your books and VAT, Corporation Tax and payroll figures against Revenue's published rules and cites revenue.ie. You file through ROS yourself, or your accountant does. AccountsOS does not submit returns to Revenue on your behalf.

Can Finn file my VAT3 return?

Finn prepares the VAT3 figures for each period and tells you the amount and the due date. The filing itself goes through ROS, and you or your accountant make it.

What is the VAT registration threshold in Ireland?

Registration is required when turnover exceeds or is expected to exceed 85,000 euro for goods or 42,500 euro for services in a 12-month period. Voluntary registration below that is allowed.

When is my Corporation Tax return due in Ireland?

The CT1 is due within nine months of your accounting period end, by the 23rd of that month when you file and pay through ROS. A year ending 31 December 2026 gives a due date of 23 September 2027.

Can Finn file my CRO annual return?

Finn tracks your Annual Return Date, keeps the ledger ready for your financial statements and reminds you about the B1. Filing is done through CORE by you or your accountant.

Does AccountsOS handle Irish payroll, PAYE and PRSI?

Finn keeps payroll costs in your ledger and works out the P30 amount using sourced PAYE, PRSI and USC rates. Payroll submissions to Revenue are made through your payroll route.

Can I switch from Sage, Xero or QuickBooks to AccountsOS?

Yes. Export your transactions, contacts and chart of accounts as CSV and upload them. Finn maps the columns itself, and your data stays exportable so there is no lock-in.

Is AccountsOS suitable for Irish sole traders as well as companies?

Yes. Finn works for limited companies, DACs and sole traders, and prepares the income and expense figures you need for the Form 11 due on 31 October.

Does AccountsOS support businesses in Ireland?

Yes. AccountsOS is fully live in Ireland, with Finn aware of Revenue (Revenue Commissioners), Companies Registration Office (CRO), EUR (€) and local entity types (Private Company Limited by Shares (LTD), Designated Activity Company (DAC), Company Limited by Guarantee (CLG)).

What entity types does AccountsOS support in Ireland?

Private Company Limited by Shares (LTD), Designated Activity Company (DAC), Company Limited by Guarantee (CLG), Public Limited Company (PLC), Unlimited Company, Sole Trader, Partnership. Each has its own tax treatment, filing requirements and default settings configured out of the box.

Can Finn file taxes directly with Revenue (Revenue Commissioners)?

No. Finn does not file with Revenue (Revenue Commissioners) for you. Finn prepares the working papers for your VAT return and corporate tax return. You or your accountant prepare and file the returns. For everything else, Finn tracks the deadline and gives you the figures from your books. You or your accountant file. Finn always cites Revenue (Revenue Commissioners) sources when it quotes a rate, threshold or deadline.

What currency and date format does AccountsOS use for Ireland?

EUR (€) throughout, with dates shown as DD/MM/YYYY. No manual conversion needed.

Can I run a company in Ireland alongside businesses in other countries?

Yes. One login covers multiple companies across any of AccountsOS's supported countries, switch between them with a click, and Finn loads the correct tax rules, currency and entity settings automatically for each.

Is my country not listed, or do I need a bespoke setup for a large client book?

We build custom country rollouts and tailored practice migrations quickly: see accounts-os.com/custom-rollout.

For founders

Stop dreading your Irish accounts

Connect a bank, forward a receipt, ask Finn a question in plain English. Free for 14 days, no card.

Start free
For accountants

Run your Irish client book on Finn

Finn does the production work across every client. Your team reviews, signs and files. Flat pricing per live client.

See practice pricing