1. Three Deductions, Not One Tax
An Irish payslip has three independent statutory lines — they are calculated separately and never blend together:
- 1PAYE income tax — the actual income tax, charged at 20% or 40% and then reduced by tax credits.
- 2Universal Social Charge (USC) — a separate charge on gross income with its own four-rate schedule (0.5% to 8%). Pension deductions do not reduce USC.
- 3PRSI (Class A) — 4.1% social insurance on gross pay, which funds the State Pension and social welfare benefits.
Your employer withholds all three in real time and reports each payroll to Revenue under PAYE Modernisation, so there is typically nothing to file yourself unless you have non-payroll income.