Datatracks Ireland – CT1 Filing & iXBRL Services Landing Page Draft 

Headline: Corporation Tax (CT 1) Filing & iXBRL Services for Irish Companies 

Subheadline: Prepare, convert, validate and file your Corporation Tax Return with confidence. 

Primary CTA: Get a Free CT1 Readiness Assessment 

Secondary CTA: Talk to a Filing Expert 

Lead Magnet 

Offer a Free CT1 Filing Readiness Assessment including deadline review, iXBRL requirement check, filing readiness assessment, recommendations and a quotation. 

Common Challenges 

• CT1 filing deadlines 

• iXBRL conversion requirements 

• Revenue validation issues 

• ROS filing preparation 

• Limited internal resources during peak periods 

Services 

• CT1 Filing Assistance 

• iXBRL Conversion 

• iXBRL Tagging 

• Validation Review 

• ROS Filing Support 

• Compliance Advisory 

How It Works/The Process 

1. Upload files 

1. Datatracks review 

1. Conversion and validation 

1. Submission-ready output 

Why Datatracks 

• Regulatory reporting expertise 

• Dedicated specialists 

• Fast turnaround 

• Secure platform 

• Global reporting experience 

Final CTA 

Filing CT1 this year? Let Datatracks help simplify your filing process. 

Get My Free CT1 Readiness Assessment 

 

Updated Landing page content: 

DataTracks Ireland – CT1 Corporation Tax Filing and iXBRL Services 

Headline: Corporation Tax Return (CT1 Form) Filing and iXBRL Tagging for Irish Companies 

Sub headline: Every Irish company pays corporation tax. Not every Irish company files it right. DataTracks prepares, converts, validates and submits your CT1 return before the September 23 deadline. 

Primary CTA: Get My Free CT1 Filing Assessment 

Secondary CTA: Talk to a CT1 Filing Specialist 

 

The September 23 Deadline Is Closer Than You Think 

Every Irish company with a December 31 accounting year-end has a corporation tax return due on September 23, 2026. That is your CT1 form, your iXBRL-tagged financial statements and your corporation tax computation – all submitted to Revenue online before midnight. 

Miss it by a single day and a surcharge begins. Miss it by more than two months and that surcharge doubles. 

Irish corporation tax is one of the most competitive business tax rates in Europe at 12.5% for trading income. But the low rate means nothing if your return is late, incorrectly tagged or rejected by Revenue. The cost of getting it wrong is the same regardless of your tax rate. 

DataTracks has supported thousands of companies across Ireland and the UK with corporation tax filing, iXBRL tagging and regulatory reporting. If your CT1 form is not yet filed, we can help you close it before September 23. 

CTA: Get My Free CT1 Filing Assessment 

 

 

What Irish Companies Get Wrong Every Year 

Filing a CT1 return in Ireland is not as simple as submitting a form. Revenue requires iXBRL-tagged financial statements alongside the CT1 return for companies above the filing threshold. The iXBRL tags must map to the correct taxonomy concepts, not just pass the Revenue validation check. 

Common challenges Irish companies face every year include: 

• CT1 form not started with less than four weeks to the corporation tax filing deadline in Ireland 

• iXBRL conversion not completed or tagged to the wrong taxonomy version 

• Revenue validation errors blocking submission at the final step 

• Financial statements not aligned with the CT1 tax computation figures 

• Last-minute changes from auditors or finance teams requiring a full re-tag 

• Limited internal resources during peak filing season across multiple entities 

• No iXBRL viewer available to check the tagged output before submission 

• Uncertainty about which iXBRL requirements apply to your company size and accounting standard 

DataTracks removes every one of these blockers. We prepare your iXBRL-tagged financial statements, validate them against the Revenue taxonomy and deliver a submission-ready output before your deadline. 

CTA: Talk to a CT1 Filing Specialist 

What Is the CT1 Form and Who Needs to File It? 

The CT1 form is the corporation tax return that every Irish company subject to corporation tax must file annually with Revenue. It covers trading income, chargeable gains, capital allowances, loss reliefs and the final corporation tax liability for the accounting period. 

For companies with a December 31 year-end, the Ireland corporate tax return due date is September 23 of the following year. This is a firm statutory deadline under the Taxes Consolidation Act 1997. There is no automatic extension. 

Business tax in Ireland applies to all companies registered in the Republic of Ireland and to foreign companies trading through a branch or agency here. The standard rate of corporation tax Ireland applies at 12.5% on trading income and 25% on non-trading income. From January 1, 2024, an additional 15% minimum effective tax rate applies to companies in groups with global revenues above EUR 750 million under Pillar Two rules. 

Whether you are a small Irish company filing your first CT1 form, a large multinational managing company taxes in Ireland alongside group obligations, or an accounting firm handling corporation tax return Ireland filings for multiple clients – DataTracks handles the full process. 

What DataTracks Delivers for Your CT1 Filing 

CT1 Form Preparation and Review We review your financial statements, tax computations and prior year returns to prepare your CT1 form for submission. All figures are cross-checked before the return is filed to Revenue. 

iXBRL Tagging to Revenue Taxonomy Revenue requires iXBRL-tagged financial statements with every CT1 return above the filing threshold. DataTracks tags your accounts to the current Revenue taxonomy, checks every concept against the correct accounting standard and delivers a validated iXBRL file ready for submission. No wrong taxonomy versions. No concept mismatches. No EPS scaling errors. 

iXBRL Validation Before Submission Every iXBRL file we produce is pre-validated before it reaches the Revenue online system. Validation errors caught at the gateway delay your filing and put you at risk of a late filing surcharge. DataTracks catches every error before submission. 

iXBRL Viewer We provide an iXBRL viewer with every tagged output so your finance team or auditors can review the tagged data before the file goes to Revenue. What you see in the viewer is exactly what Revenue receives. 

Revenue Submission Support We support your team through the Revenue submission process. If you are managing the submission yourself, we provide the filing-ready iXBRL file and CT1 output. If you need end-to-end support, we manage the submission for you. 

Compliance Advisory Unsure whether your company is above the iXBRL filing threshold? Not certain whether your accounting standard requires FRS 102 or IFRS tagging? Our specialists advise on the specific requirements that apply to your company before we begin. 

The CT1 Surcharge You Cannot Afford 

Late filing of an Irish corporation tax return does not attract a fixed penalty. It attracts a surcharge calculated directly on your tax liability. 

File between one day and two months late and Revenue applies a 5% surcharge on your corporation tax liability, capped at EUR 12,695. 

File more than two months late and that surcharge doubles to 10%, capped at EUR 63,485. 

On a tax liability of EUR 500,000, a two-month delay costs EUR 25,000. A delay beyond two months costs EUR 50,000. 

These are not recoverable. There is no appeal process for a surcharge that arises solely because the return was late. 

DataTracks files your CT1 return before September 23. The surcharge does not apply. 

CTA: Get My CT1 Filed Before September 23 

How It Works 

Step 1: Submit your details Fill in the form and tell us about your company, your accounting period and your iXBRL requirements. We respond within one business hour with a fixed-price quote. 

Step 2: Send us your files Share your financial statements, tax computations and any prior year CT1 returns. We accept all formats. 

Step 3: DataTracks prepares and tags We prepare your CT1 form and tag your financial statements to the Revenue iXBRL taxonomy. Every file is validated before we deliver it. 

Step 4: You review, we submit You review the output using the iXBRL viewer. Once approved, we support submission to Revenue before your September 23 deadline. 

Why DataTracks for Your Corporation Tax Return Ireland 

September 23 Deadline Guaranteed We work backwards from your filing deadline. If you engage us before September 9, we guarantee delivery in time for September 23. Every time. 

iXBRL Tagging to Current Revenue Taxonomy The Revenue taxonomy is updated regularly. DataTracks always tags to the current version. No outdated taxonomy. No silent errors on your Revenue record. 

Pre-Validation Before Every Submission Every iXBRL file is checked against Revenue validation rules before it reaches the online system. What the Revenue gateway does not catch, DataTracks does. 

Fast Turnaround. Fixed Price. 1 day express, 3 day standard and 10 day economy options. Fixed price from the moment you accept the quote. No surprises. 

iXBRL Viewer Included Review your tagged output before submission. Share it with your auditors. Confirm every figure maps to the right concept before the file goes to Revenue. 

Trusted by 30,000 Clients Globally DataTracks has filed over 450,000 compliance reports for clients including Big Four accounting firms across the UK, Ireland and internationally. 

Dedicated Irish Tax Filing Specialists Our team understands irish corporation tax, the Revenue online system and the specific iXBRL requirements that apply to Irish companies under FRS 102, FRS 105 and full IFRS. 

Built for Every Team Filing CT1 in Ireland 

DataTracks supports every type of organisation with a corporation tax filing obligation in Ireland. 

We work with Finance Directors and Finance Managers managing CT1 filings for Irish group entities. We work with Tax Managers and Tax Directors handling corporation tax return Ireland obligations alongside group tax reporting. We work with accounting firms and corporate secretarial practices filing CT1 returns for multiple clients before the September 23 deadline. And we work with company directors of owner-managed businesses who need their CT1 form filed accurately and on time without the internal resource to do it themselves. 

If your company pays business tax in Ireland, DataTracks can file your CT1 return. 

CTA: Talk to a CT1 Specialist Today 

Your CT1 Filing Checklist Before September 23 

Before your corporation tax return Ireland is submitted, make sure the following are complete. 

• CT1 form prepared and all figures agreed with the financial statements 

• iXBRL-tagged financial statements produced to the current Revenue taxonomy 

• iXBRL file pre-validated for errors before submission 

• Tax computation figures consistent with the CT1 return 

• iXBRL viewer review completed and signed off by finance or audit 

• Revenue online submission confirmed and acknowledgement received 

• Filing confirmation retained for your records 

Not sure where you stand on this list? DataTracks will tell you within one business hour. 

CTA: Get My Free CT1 Filing Assessment 

 

CT1 Filing Starts Here 

Filing your Irish corporation tax return does not have to be complicated. DataTracks handles the iXBRL tagging, the validation, the Revenue submission and everything in between. 

The September 23 deadline is firm. The surcharge is automatic. The solution is one conversation away. 

Submit your details below and a DataTracks CT1 specialist will contact you with a fixed-price quote and next steps within one business hour. 

Form fields: Work email, Full name, Company name, Job title, Number of entities to file, Turnaround required 

Form CTA: Get My Free CT1 Filing Assessment 

Frequently Asked Questions 

What is the CT1 form? The CT1 form is the annual corporation tax return that every Irish company subject to corporation tax must file with Revenue. It reports the company’s income, gains, reliefs and the final corporation tax liability for the accounting period. For companies with December 31 year-ends, the CT1 form must be filed by September 23 of the following year. 

What is the corporation tax filing deadline in Ireland? For companies with a December 31, 2025 accounting year-end, the corporation tax filing deadline in Ireland is September 23, 2026. This is the date by which the CT1 form, iXBRL-tagged financial statements and any corporation tax payment must all reach Revenue. 

What is the corporation tax rate in Ireland? Irish corporation tax applies at 12.5% on trading income and 25% on non-trading income. From January 1, 2024, a 15% minimum effective tax rate applies to companies in groups with global revenues above EUR 750 million under Pillar Two rules. 

What is iXBRL tagging and does my company need it? iXBRL stands for inline eXtensible Business Reporting Language. Revenue requires iXBRL-tagged financial statements to be filed alongside the CT1 return for companies above the mandatory iXBRL filing threshold. The tags embed machine-readable data into your financial statements so Revenue’s systems can analyse the figures. DataTracks advises on whether your company is above the threshold and handles the full tagging process. 

What happens if I file my CT1 form late? Late filing of an Irish corporation tax return triggers a surcharge on your tax liability. The surcharge is 5% if the return is filed within two months of the deadline, capped at EUR 12,695. If the return is filed more than two months late, the surcharge rises to 10%, capped at EUR 63,485. There is no appeal process for a surcharge that arises solely from late filing. 

How quickly can DataTracks file my CT1 return? DataTracks offers a 1 day express, 3 day standard and 10 day economy turnaround. If your September 23 deadline is approaching, contact us immediately and we will confirm whether express turnaround is available for your filing. 

Can DataTracks file CT1 returns for multiple Irish entities? Yes. DataTracks supports accounting firms, corporate secretarial practices and group finance teams filing CT1 returns for multiple Irish entities. We offer volume pricing and a scalable delivery process for high-volume filing requirements. 

 

Sources 

• Revenue: Corporation Tax – Filing and Payment Dates https://www.revenue.ie/en/companies-and-charities/corporation-tax-for-companies/filing-your-corporation-tax-return/index.aspx 

• Revenue: iXBRL Filing Requirements https://www.revenue.ie/en/online-services/support/documents/ixbrl/ixbrl-guidance.pdf 

• Revenue: Corporation Tax Rates https://www.revenue.ie/en/companies-and-charities/corporation-tax-for-companies/corporation-tax-rates/index.aspx 

 

DataTracks Ireland. Trusted by 30,000 clients globally. 450,000 compliance reports filed.