£34,000 self-employed profit after tax in Northern Ireland (2026-27)
A sole trader in Northern Ireland with £34,000 of profit pays £4,286 of Income Tax and £1,286 of Class 4 National Insurance in 2026-27. That leaves £28,428, about £2,369 a month.
| Taxable profit | £34,000 |
| Personal Allowance | £12,570 |
| Income Tax | £4,286 |
| Class 2 NI (treated as paid) | £0 |
| Class 4 NI | £1,286 |
| Profit after tax and NI | £28,428 |
| Per month | £2,369 |
How this is worked out
Profit is income minus allowable expenses. Income Tax is charged on profit above the £12,570 Personal Allowance. Northern Ireland uses the same Income Tax bands as England: 20%, 40% and 45%.
Class 2 National Insurance is treated as paid when profits are £7,105 or more, so there is nothing to pay. Class 4 is 6% on profits between £12,570 and £50,270 and 2% above.
Assumptions: 2026-27 rates, no other income, no pension contributions. Tax and Class 4 are paid through Self Assessment.
Sources: Self-employed National Insurance rates (GOV.UK), Income Tax rates and allowances (GOV.UK)