Millwrights install, align and maintain heavy industrial and process plant machinery, from conveyor systems and gearboxes to precision-aligned rotating equipment. Many progress from a factory-based apprenticeship into multi-skilled maintenance roles, and from there into higher-paying self-employed shutdown and turnaround contract work. This guide shows exactly what millwrights take home after income tax and National Insurance deductions for the 2026/27 tax year, covering both employed and self-employed routes.
Figures are indicative market rates; actual pay varies significantly by sector, multi-skilling and location.
| Role | Career Stage | Salary Range | Notes |
|---|---|---|---|
| Apprentice Millwright | 0--3 years | £18,000--£22,000 | Engineering apprenticeship; NVQ Level 2/3 mechanical engineering |
| Qualified Millwright | 3--7 years | £30,000--£38,000 | Time-served; factory or process plant maintenance |
| Senior/Multi-Skilled Engineer | 7+ years | £38,000--£48,000 | Mechanical plus electrical/hydraulic fault-finding |
| Self-Employed Contract Millwright | Varies | £40,000--£65,000+ | Direct invoicing or agency; Class 4 NI via Self Assessment |
| Shutdown/Turnaround Millwright | Varies | £50,000--£75,000+ | Petrochemical or power generation shutdown contracts |
These scenarios illustrate take-home pay at different career stages using 2026/27 England tax rates (personal allowance £12,570). The self-employed contractor example uses Class 4 self-employed National Insurance.
Engineering apprenticeship
Employed
After business costs
Figures are for England, Wales and Northern Ireland. Scottish taxpayers pay Scottish Income Tax rates.
| Scenario | Gross | Income Tax | NI | Net/yr | Net/mo |
|---|---|---|---|---|---|
| Apprentice | £19,000 | -£1,286 | -£514 | £17,200 | £1,433/mo |
| Newly qualified | £26,000 | -£2,686 | -£1,074 | £22,240 | £1,853/mo |
| Qualified millwright | £34,000 | -£4,286 | -£1,714 | £28,000 | £2,333/mo |
| Senior multi-skilled engineer | £44,000 | -£6,286 | -£2,514 | £35,200 | £2,933/mo |
Self-employed millwrights on shutdown and turnaround contracts usually invoice directly, paying Income Tax and Class 4 National Insurance (6% on profits between £12,570 and £50,270, 2% above) on their full annual profit via Self Assessment. Those engaged through an agency inside IR35 may instead have PAYE tax and NI deducted at source.
Allowable expenses typically include tools and equipment, PPE, safety passport/certification renewal costs, insurance, van costs and travel or accommodation for away-from-home shutdown contracts. Unlike employees, self-employed millwrights receive no employer pension contribution, statutory sick pay or paid holiday, and must arrange their own pension provision.
| Annual Profit | Income Tax | Class 4 NI | Net/yr |
|---|---|---|---|
| £45,000 | -£6,486 | -£1,946 | £36,568 |
| £55,000 | -£9,432 | -£2,357 | £43,211 |
| £70,000 | -£15,432 | -£2,657 | £51,911 |
Millwrights who combine mechanical fitting with electrical, hydraulic or PLC fault-finding skills command a significant premium over mechanical-only fitters, as employers value engineers who can resolve a wider range of breakdowns without a second trade being called out.
Millwrights working in petrochemical, power generation or heavy manufacturing typically earn more than those in light manufacturing or food production, reflecting the complexity and criticality of the plant involved.
Planned shutdown and turnaround contracts pay a substantial premium over routine maintenance work, reflecting the intense, time-critical nature of the work, unsociable shift patterns and the need to hold site-specific safety passports.
Self-employed contract millwrighting offers higher day rates and flexibility over which contracts to take, but removes employment protections such as paid holiday, sick pay and pension contributions, and requires managing Self Assessment tax.
