📖 Reviewed August 2026

Irish Business & Tax Terms,
Explained Simply.

Company formation, CRO compliance, tax, payroll, VAT and ecommerce in Ireland come with a language of their own. This glossary explains the terms business owners encounter.

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PPSN IPN RBO B1 CT1 VAT3 RPN BIK Section 137 OSS KEEP Payroll

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Commonly confused Irish business terms

CRO vs Revenue
CROCompany incorporation and company-law filings.
RevenueTaxes, PAYE, VAT, Corporation Tax, RCT and customs.
B1 vs CT1
B1Annual Return filed with CRO.
CT1Corporation Tax return filed with Revenue. A company can have both obligations for the same year.
PPSN vs IPN
PPSNPersonal Public Service Number — used across Revenue and State systems.
IPNCRO identification number (VIF process). Does not automatically replace a PPSN for Revenue.
Registered Office vs Trading Address
Reg. OfficeStatutory company address recorded with CRO.
TradingWhere the business operates. They can be different.
RCT vs PSWT
RCTRelevant contracts in construction, forestry and meat processing.
PSWTProfessional-services payments by accountable public-sector bodies.
MVL vs CVL
MVLMembers' Voluntary Liquidation — for a solvent company with assets to distribute.
CVLCreditors' Voluntary Liquidation — generally used where the company is insolvent.
Abridged vs Filleted Accounts
AbridgedA reduced CRO filing using exemptions. Company still prepares full accounts.
FilletedStatutory omissions from the publicly filed version — different mechanism from abridged.
Salary vs Dividend
SalaryPayroll remuneration — generally deductible for Corporation Tax.
DividendDistribution of post-tax company profits. Not deductible for CT.

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