Revenue penalties are automatic. There is no “friendly reminder period.”
Missing a Tax Deadline can result in:
- Surcharges (5% or 10% of tax due for Corporation Tax or Income Tax)
- Daily interest charges
- Loss of tax clearance
- Publication on the Revenue tax defaulters list
- Restrictions on tax refunds
- Increased audit risk
If you’re planning to apply for:
- A bank loan
- LEO funding
- Enterprise Ireland support
- Government contracts
- Investor funding
A missed Tax Deadline can undermine your credibility instantly.
That’s why proactive tax planning matters. If you’d prefer a structured compliance calendar built specifically for your business, speak to a Dublin tax specialist today.
Key Irish Tax Deadlines for Limited Companies
Below is a simplified overview. Exact dates can vary slightly depending on weekends and ROS extensions.
1. Corporation Tax Deadline
If you operate through a limited company, Corporation Tax is due:
- Preliminary Tax: Month 11 of your accounting period
- Final Corporation Tax & CT1 Return: 9 months after year-end (plus typically a 23-day ROS extension)
Example:
If your company year-end is 31 December 2025:
- Preliminary Tax: 30 November 2025
- Final CT1: 23 September 2026 (if filing via ROS)
Missing this Tax Deadline triggers:
- 5% surcharge (up to €12,695) if late within 2 months
- 10% surcharge thereafter
If you’re unsure how much Preliminary Tax you should pay, book a consultation before your next Tax Deadline.
2. VAT Deadline
Most SMEs file VAT:
- Bi-monthly (every two months)
- Or quarterly in some cases
VAT is due on the 19th of the month following the period — or around the 23rd via ROS.
Late VAT = interest + potential Revenue intervention.
If VAT is becoming a cash flow issue, speak to a proactive Dublin accountant today to review your structure.
3. PAYE/PRSI/USC Payroll Deadline
Since Revenue’s real-time reporting (RTR) system:
- Payroll submissions must be filed on or before the pay date
- Employer liabilities are typically due by the 23rd of the following month (ROS)
Missing a payroll Tax Deadline is particularly serious because:
- Employees are affected
- Revenue visibility is immediate
- Penalties apply quickly
If you’re manually running payroll, it may be time to modernise. Book a payroll compliance review now.
4. Income Tax Deadline (Sole Traders & Directors)
For self-employed individuals:
- 31 October 2026 (paper filing)
- Mid-November 2026 (ROS extension typically applies)
Includes:
- Balance of prior year tax
- Preliminary Tax for current year
If you’re a company director drawing income, you likely have personal filing obligations too. Don’t miss this personal Tax Deadline.
Need clarity on director tax planning? Schedule a discovery call today.
5. CRO Annual Return Deadline (Companies)
While not strictly a Revenue tax filing, missing this deadline can:
- Result in late filing penalties
- Trigger loss of audit exemption
- Impact company standing
Your Annual Return Date (ARD) is specific to your company.
If you don’t know your ARD, contact a Dublin compliance specialist now.
| Tax Type | Typical Deadline | Penalty for Missing |
| Corporation Tax (CT1) | 9 months after year-end | 5%–10% surcharge + interest |
| Preliminary Corporation Tax | Month 11 of accounting period | Interest + possible surcharge |
| VAT (Bi-Monthly) | 19th/23rd following period | Interest + compliance risk |
| PAYE/PRSI/USC | Real-time + 23rd monthly | Immediate Revenue visibility |
| Income Tax | 31 Oct / mid-Nov (ROS) | 5%–10% surcharge |
If you want a personalised Tax Deadline calendar tailored to your business year-end, book a strategy call now.
What happens if you miss a Tax Deadline?
Let’s be direct.
Revenue systems are automated.
When you miss a Tax Deadline:
- Surcharge is applied automatically.
- Interest accrues daily.
- Tax Clearance may be revoked.
- Refunds can be withheld.
- Risk rating may increase.
Repeated missed deadlines can lead to:
- Revenue audit
- Revenue compliance intervention
- Enforcement proceedings
If you’ve already missed a Tax Deadline, act immediately. Speak to a Dublin tax advisor today before the situation escalates.
How to never miss another Tax Deadline
1. Use ROS correctly
The Revenue Commissioners operate through the Revenue Online Service (ROS). Filing electronically:
- Gives extensions
- Provides confirmations
- Tracks history
If you’re not fully comfortable with ROS, book a ROS training session today.
2. Align your accounting period strategically
Choosing the right year-end can:
- Improve cash flow
- Align with seasonal revenue
- Make Preliminary Tax easier to forecast
Planning ahead reduces Tax Deadline pressure.
If your year-end isn’t working for you, talk to a proactive Dublin accountant now.
3. Maintain Real-Time Bookkeeping
Waiting until year-end guarantees stress.
Monthly management accounts help you:
- Forecast Corporation Tax
- Monitor VAT exposure
- Prepare for Preliminary Tax
- Avoid surprises before a Tax Deadline
If you don’t receive monthly numbers, you’re flying blind. Switch to a strategic Dublin accountant today.
4. Build a Compliance Calendar
Every Irish SME should maintain:
- Corporation Tax reminder
- VAT schedule
- Payroll dates
- Income Tax reminder
- CRO Annual Return date
If you want a done-for-you compliance calendar, request one now.
Tax Deadline Planning for Dublin Startups
If you’re a startup founder in Dublin:
- You may qualify for Start-Up Relief for Entrepreneurs (SURE)
- You may be eligible for R&D tax credits
- You may be drawing minimal salary initially
This creates unique Tax Deadline considerations around:
- Director PAYE registration
- VAT registration thresholds
- Corporation Tax exemptions
- CRO filings
If you’re pre-revenue or early-stage, book a startup tax planning session today.
Tax Deadline – FAQs
When is Corporation Tax due in Ireland? +
Corporation Tax is generally due 9 months after your accounting year-end.
Additionally, Preliminary Tax must be paid in month 11 of the accounting period.
Plan ahead to avoid missing this important Tax Deadline.
What happens if I miss a Tax Deadline? +
You may face:
- 5% or 10% surcharge
- Daily interest charges
- Loss of Tax Clearance
Repeated delays may increase Revenue scrutiny.
Is there an extension for filing via ROS? +
Yes. Filing electronically through ROS usually provides a short extension, often moving the deadline to around the 23rd of the month.
Always confirm your specific Tax Deadline to avoid interest.
Do directors have personal Tax Deadlines? +
Yes. Directors with additional income must file a Form 11 by 31 October, or mid-November if filing via ROS.
This is separate from company Tax Deadlines.
Can Revenue waive penalties? +
In limited cases, Revenue may consider mitigation if a reasonable excuse can be demonstrated.
However, interest generally still applies.
If you’re unsure, speak to a Dublin tax specialist today.
Final Thoughts: Stay Ahead of Every Tax Deadline
A missed Tax Deadline is preventable.
With proper systems, forecasting, and proactive advice, compliance becomes routine — not reactive.
If you want:
- Peace of mind
- Predictable cash flow
- Reduced audit risk
- A structured compliance plan
- Strategic tax planning
Then it’s time to move beyond basic compliance.
Book a discovery call today.
Switch to a proactive Dublin accountant.
Speak to a trusted Irish tax advisor now.
Your next Tax Deadline is coming — make sure you’re ready.
