Tax-year versioning
2026 rules are isolated from future tax years so a later rules update does not silently rewrite a historical calculation.
Source-backed,
not black-box.
TaxComply Ireland is built around transparent 2026 rules, repeatable tests and explicit limits.
Deterministic calculations
PAYE, USC and PRSI are calculated from coded rules rather than generated by AI. Unsupported legal or tax judgement is flagged for review instead of guessed.
Official-source validation
Automated regression tests reproduce published Revenue and DSP worked examples and test important rate boundaries.
One shared core
The free Income Tax Calculator, Personal Tax Review and Shadow Payroll use the same canonical PAYE/USC logic and shared PRSI engine.
Audit trail
Supported calculations expose tax bases, rates, credits, workday sourcing and assumptions so the output can be checked.
Scope controls
Foreign-income, tax-equalisation and other specialist cases that are not fully supported are marked Requires review rather than presented as final.
63 source-linked Revenue/DSP validation cases.
The automated development suite currently covers published examples and boundary cases across Income Tax, USC, pension limits, tax credits, PRSI, termination relief, Personal Tax Review controls, STBV and Shadow Payroll. Passing tests do not mean every Irish tax scenario is supported.
Unsupported / unresolved factsRequires reviewTax year2026 onlyCalculation approachDeterministic rulesPayroll / Revenue filingNot performed by TaxComply Ireland