£24,000 Salary Plus £12,000 Second Job: Tax Guide
Calculated combined take-home for a £24,000 main salary and £12,000 of second-job salary, including Income Tax and the relevant National Insurance.
Direct answer: A £24,000 main salary plus £12,000 of second-job salary produces about £30,400 annual take-home, or £2,533 a month. The calculation includes £4,686 of Income Tax and £914 of National Insurance.
Assumptions: England, Wales or Northern Ireland; 2026/27 rates; standard Personal Allowance; no pension, student loan or benefits; the figures are annualised. Employee National Insurance is calculated separately for each employment.
The calculated combined position
| Item | Annual amount |
|---|---|
| Main salary | £24,000 |
| Second salary | £12,000 |
| Total income before deductions | £36,000 |
| Income Tax across both incomes | £4,686 |
| Employee NI across both jobs | £914 |
| Combined take-home | £30,400 |
Why the incomes must be combined
Income Tax depends on total taxable income, not on each source viewed in isolation. The calculation therefore applies the tax bands to £36,000 in total. This avoids giving both sources a full Personal Allowance or treating the additional income as though it starts in the basic-rate band.
National Insurance differs from Income Tax because each employer normally calculates employee NI for its own payroll. The table adds the two independently calculated NI amounts.
Checks before using the monthly figure
- Check that HMRC has allocated the tax code between employments correctly.
- Keep business turnover separate from profit after allowable expenses.
- Add pension and student-loan deductions before setting a household budget.
- Use Scottish Income Tax bands if the taxpayer is resident in Scotland.
PAYE timing can move tax between payslips even when the annual total is unchanged. Self-employed income is normally settled through Self Assessment, so reserve the calculated liability rather than treating every receipt as spendable cash.
Official references and calculators
Figures use the 2026/27 Income Tax rates and National Insurance rates. Compare the individual amounts with the salary calculator, two-jobs calculator and self-employed calculator.