Official form guide
Form CA12
Form CA12 is a corporate tax return form issued by the Revenue Commissioners for Irish companies to report their tax liabilities. It is typically used for filing annual corporation tax returns based on a company's accounting period.
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Form Overview
Revenue Commissioners - Form CA12
Form CA12 is a corporate tax return form issued by the Revenue Commissioners for Irish companies to report their tax liabilities. It is typically used for filing annual corporation tax returns based on a company's accounting period.
Risk Radar
Scan points- 1The most common mistake is missing the filing deadline, which automatically triggers penalties and interest charges.
- 2Incorrect calculation of taxable profits
- 3Missing deadlines leading to penalties
- 4Failure to report all income sources
- 5Incorrect claim of tax reliefs
Plain English
This is the main tax form that Irish companies use to tell Revenue about their profits and taxes owed. It's like a tax report card for businesses, showing how much tax they need to pay based on their earnings.
Submission Date
- Filing date: Form CA12 must be filed within 9 months of the end of your company's accounting period. For companies with December 31 year-ends, this means the deadline is typically September 30 of the following year.
- Preparation window: collect IDs, supporting records, and signatures in advance.
- Final review: verify names, dates, and required fields before submission.
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What this form is for
- Use for annual corporation tax returns
- Required for companies with accounting periods ending in 2023
- Not for sole traders or partnerships
- Not for PAYE or VAT returns
- Use for both active and dormant companies
- Not for non-resident companies
Form selector
Use this form or another form?
Company with VAT obligations
Different tax types require separate forms
✓ Confirm which taxes apply to your business
Sole trader business
Different legal entity with different tax obligations
✓ Check your business structure
Company with employees
Employment taxes require separate filings
✓ Ensure all tax obligations are covered
Non-resident company with Irish operations
Different reporting requirements for non-residents
✓ Confirm residency status with Revenue
Form CA12 (with specific sections)
Company claiming R&D tax credits
Special form required for credit claims
✓ Prepare R&D documentation separately
Deadline or filing window
Form CA12 must be filed within 9 months of the end of your company's accounting period. For companies with December 31 year-ends, this means the deadline is typically September 30 of the following year.
Before you submit
- 1Verify all financial figures match your accounts
- 2Check that all income sources are reported
- 3Confirm tax calculations are correct
- 4Ensure all required signatures are included
- 5Keep a copy of the submitted form
- 6Check that the form version matches your accounting period
- 7Confirm all tax reliefs claimed are properly documented
- 8Ensure company details are up to date
How to file this form
- 1Gather all necessary financial records and accounts
- 2Download the correct version of Form CA12 from Revenue's website
- 3Complete all relevant sections with accurate financial information
- 4Calculate tax liability and any applicable reliefs
- 5Review all entries for accuracy before submission
- 6Submit online via ROS or by post to Revenue
- 7Keep a copy of the filed form for your records
Known limitations
- 1Form does not cover VAT obligations
- 2Not suitable for partnerships or sole traders
- 3Does not handle PAYE submissions
- 4Limited guidance for complex group structures
- 5May require supplementary forms for certain tax reliefs
Field map
Compact field-by-field guide
Identity
3 items
Your full name as Revenue holds it.
Your Personal Public Service number — Revenue matches the form to your record with this.
Your current address, including Eircode.
Details
1 items
The year or period the form relates to.
Amounts
1 items
Enter each amount against the heading it belongs to.
Declaration
1 items
Sign to confirm the details are correct and complete.
Almost done reviewing the fields?
Fillable formOpen in Editor->The current version of Form CA12 is valid for accounting periods ending on or before December 31, 2023. Always check Revenue's website for the most up-to-date form before filing.
What changed or needs a fresh check
- Updated accounting period references
- Modified sections for digital reporting
- Changed format for tax relief claims
- Updated contact information for Revenue support
- Added guidance for online filing
Quick Facts
Downloads & source
Sources
- SRCForm CA12 is issued by Revenue Commissioners
- SRCForm is used for corporation tax returns
- SRCSubmission deadline is 9 months after accounting period end
- SRCCan be submitted via ROS or by post
- SRCNot confirmed in official source: Specific sections of the form
- SRCNot confirmed in official source: Current version number
- SRCNot confirmed in official source: Exact penalty amounts for late submission
- SRCNot confirmed in official source: Processing times after submission
Common confusion points
Determining the correct accounting period
Understanding what qualifies as trading income
Calculating allowable expenses
Distinguishing between capital and revenue expenditure
Understanding tax relief eligibility
Completing forms for group companies
Filing requirements for dormant companies
Digital filing requirements and procedures
Source transparency
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