Quick answer
- Self-employed profit can be liable to USC alongside Income Tax and Class S PRSI.
- The calculation uses chargeable non-PAYE income rather than turnover alone.
- An additional 3% USC surcharge applies to individual non-PAYE income above €100,000, producing 11% on that excess under 2026 rules.
- The surcharge test concerns non-PAYE income, while ordinary USC bands consider the wider relevant income position.
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Turnover is not the USC profit figure
A sole trader starts with business receipts, deducts allowable business expenses and arrives at taxable or chargeable profit. USC is not normally calculated by applying a percentage directly to every euro collected from customers.
| Figure | Meaning | USC use |
|---|---|---|
| Turnover | Total business sales or fees | Starting point, not usually final USC income |
| Allowable expenses | Wholly and exclusively business costs under tax rules | Can reduce taxable business profit |
| Chargeable profit | Tax-adjusted profit after allowable deductions | Core non-PAYE income figure |
| Drawings | Money taken from the business personally | Do not determine the profit by themselves |
Employee payroll versus self-assessment
| PAYE employee | Self-employed person |
|---|---|
| Employer deducts USC each payday | Individual calculates USC through the annual return |
| RPN supplies payroll cut-off points | Tax return combines liable income and claims |
| Corrections can occur through cumulative payroll | Balance is settled with Income Tax, PRSI and preliminary tax |
| Payslip shows period and year-to-date USC | Form 11/assessment shows the annual liability |
A person can have both PAYE salary and self-employed profit. USC already deducted through payroll is credited against the final annual USC liability; it is not a second exemption or a separate set of bands.
The additional 3% non-PAYE surcharge
Revenue’s 2026 manual states that a 3% surcharge applies to the part of an individual’s non-PAYE income above €100,000. This produces an 11% USC rate on that excess because it sits on top of the 8% standard rate.
Example: a person has €40,000 PAYE salary and €110,000 non-PAYE investment or self-employed income. The additional surcharge is calculated only on the €10,000 of non-PAYE income above €100,000: €10,000 × 3% = €300. The ordinary USC calculation on total relevant income is separate.
Expenses, capital allowances and losses need care
Allowable trading expenses reduce business profit before the tax calculation. Revenue also permits certain capital allowances for plant, machinery and specified buildings before USC is calculated. Loss relief and property-based reliefs can follow narrower rules, including possible surcharges, so an Income Tax deduction should not automatically be assumed to reduce USC.
Rental income, dividends, share-option gains and investment income can also enter USC. Keep them separate in records even where they ultimately combine in the annual computation.
A safer tax set-aside workflow
- Forecast annual turnover and allowable expenses.
- Estimate chargeable profit and add other relevant income.
- Calculate Income Tax, USC and Class S PRSI separately.
- Check whether the extra non-PAYE surcharge can apply.
- Include preliminary tax and the filing deadline in cash-flow planning.
- Reforecast after large invoices, capital purchases or a PAYE job change.
The USC Calculator can isolate the USC component, while the Contractor Tax Set-Aside guide covers the wider cash reserve. Complex mixed income, losses or reliefs can justify professional tax advice.
Frequently asked questions
Do self-employed people pay USC?
Yes. Chargeable self-employed profit can be liable to USC alongside Income Tax and Class S PRSI.
Is USC calculated on self-employed turnover?
Not normally. The relevant figure is based on tax-adjusted profit after allowable business expenses, not gross sales alone.
What is the 11% USC rate?
It is the 8% standard rate plus an additional 3% surcharge on individual non-PAYE income above €100,000.
Does the extra 3% apply if total income exceeds €100,000?
Not automatically. The surcharge applies to the part of non-PAYE income itself that exceeds €100,000.
Is rental income subject to USC?
Ordinary rental income can be within USC. Qualifying Rent-a-Room Relief income is specifically exempt.
Do business expenses reduce USC?
Allowable expenses reduce taxable business profit. A personal or disallowed expense cannot be used merely to reduce USC.
Can capital allowances reduce USC?
Revenue allows specified capital allowances before USC, but property and loss-relief rules can be more restrictive.
Can I use the USC Calculator for self-employed income?
Yes for a planning estimate, including the non-PAYE surcharge option. The annual return remains the official calculation.
Sources & references
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