The Universal Social Charge, or USC, is a tax on your total income in Ireland, charged in bands like income tax but with its own rates and its own rules. It sits on top of income tax, so an Irish payslip normally shows three deductions where most countries show one or two.
For 2026 the standard rates are 0.5% on the first €12,012, 2% on the next €16,688 up to €28,700, 3% on the next €41,344 up to €70,044, and 8% on everything above. There is a cliff at the bottom: once your total income is over €13,000 you pay USC on all of it, according to Revenue. On €50,000 that is €60.06 plus €333.76 plus €639.00, or €1,032.82 for the year.
A pension contribution does not reduce it: Revenue gives no USC relief for employee pension contributions, so paying into a pension saves you income tax at your marginal rate but leaves USC where it was.
If you are 70 or over, or hold a full medical card, and your income is €60,000 or less, reduced rates apply: 0.5% on the first €12,012 and 2% on the rest.
USC is separate from PRSI, the social insurance contribution. PRSI builds entitlement to the State Pension and other benefits; USC is a charge on income and earns you no entitlement.
The take-home pay calculator shows USC as its own line with a band by band derivation, uses your age and a medical card switch to apply the reduced rates, and charges it on your pay before any pension contribution.