Ireland vs Portugal
Corporate Tax Comparison
Time of Update: Ireland: 4/04/2026 / Portugal: 4/04/2026
Compare Ireland and Portugal corporate tax rates, filing due dates, withholding tax, VAT, capital gains tax, and effective tax metrics for cross-border company planning.
Ireland vs Portugal Corporate Tax Comparison
Basic Corporate Tax Comparison
Corporate Income Tax (CIT)
Ireland
Portugal
General CIT Rate:
Trade company: 12.5%. Non-trade company: 25% (e.g. royalties received by passive holding companies).
General CIT Rate:
21
CIT Return Due Date:
Nine months after the end of the tax accounting period.
CIT Return Due Date:
The last day of the fifth month after the end of the tax year.
CIT Payment Due Date:
Nine months after the end of the tax accounting period.
CIT Payment Due Date:
The last day of the fifth month after the end of the tax year.
CIT Estimated Payment Due Date:
Small companies: The first installment should be due 31 days before the end of the tax accounting period, and the final installment should be due at the time of submitting the tax return; Large companies: The first installment should be due six months after the start of the tax accounting period, the second installment should be due 31 days before the end of the tax accounting period, and the final installment should be due at the time of submitting the CIT return for that period. * Not later than the 23rd of the month.
CIT Estimated Payment Due Date:
Three-stage installment payments due in July, September, and December (if the tax year corresponds to the calendar year). Under certain conditions, the final installment payment may be waived.
Withholding Tax (WHT)
Ireland
Portugal
Resident Withholding Tax (Dividend/Interest/Royalty):
25/20/20
Resident Withholding Tax (Dividend/Interest/Royalty):
25/25/25
None-Resident Withholding Tax (Dividend/Interest/Royalty):
25/20/20
None-Resident Withholding Tax (Dividend/Interest/Royalty):
25/0-25/25
Value-Added Tax (VAT)
Capital Gain Tax (CGT)
Ireland
Portugal
General Capital Gain Tax Rate:
33%
General Capital Gain Tax Rate:
25 (same as the normal CIT rate for corporations)
Effective Tax Rate (ETR)
Ireland
Portugal
Composite Effective Average Tax Rate:
12.36
Composite Effective Average Tax Rate:
28.42%
Composite Effective Marginal Tax Rate:
13.21
Composite Effective Marginal Tax Rate:
16.01%
