At £600/day, tax planning becomes as important as the day rate itself. The personal allowance taper (starting at £100,000) affects both Ltd contractors who draw all post-CT profit as dividends, and umbrella contractors whose gross salary reaches £114,130. The smartest approach: cap personal income below £100,000 and direct surplus into a company pension.
Take-Home Comparison — £600/Day
| Ltd Company (capped at £99,500) | Umbrella | PAYE | |
|---|---|---|---|
| Annual revenue | £132,000 | £132,000 | £132,000 |
| Gross salary | £12,570 | £114,130 | £115,435 |
| Personal allowance | £12,570 (intact) | £5,505 (tapered) | £4,852 (tapered) |
| Income tax | £19,870 (div tax) | £34,497 | £35,150 |
| National Insurance | £0 (employee) | £4,293 | £4,319 |
| Monthly take-home | £6,636 | £6,278 | £6,331 |
| Annual take-home | £79,630 | £75,340 | £75,966 |
Ltd take-home assumes £12,570 salary + £86,930 dividends = £99,500 total personal income. £1,561 retained in company.
Ltd Company Calculation (Outside IR35, income capped at £99,500)
Annual revenue: £132,000
- Director salary: −£12,570
- Employer NI: −£1,136
- Ltd expenses: −£3,000
- Taxable profit: £115,294
Corporation tax (marginal relief): CT = 25% × £115,294 − (£250,000 − £115,294) × 3/200 = £28,824 − £2,021 = £26,803 (effective rate: ~23.2%)
Profit after CT: £88,491
Dividends paid (to keep personal income at £99,500): £86,930
- Remaining retained in company: £1,561
Dividend tax:
- £500 at 0% = £0
- £37,200 at 8.75% = £3,255
- £49,230 (above £50,270 total income) at 33.75% = £16,615
- Total dividend tax: £19,870
Take-home: £12,570 + £86,930 − £19,870 = £79,630/year = £6,636/month
The PA Taper — Why Stopping at £99,500 Matters
Without income cap:
- Post-CT profit = £88,491; draw all as dividends
- Personal income = £12,570 + £88,491 = £101,061
- PA lost = (£101,061 − £100,000) ÷ 2 = £531
- This adds ~£212 in extra income tax (20% on £531 of now-taxable salary)
- Effective marginal rate in taper zone: 60%+
By stopping at £99,500, the contractor keeps their full £12,570 personal allowance — the difference is marginal at £600/day but grows significantly at £700+/day.
Umbrella Company Calculation (Inside IR35 — with PA taper)
Revenue after umbrella margin: £130,500 Gross salary: (£130,500 + £750) ÷ 1.15 = £114,130
Personal allowance reduction: (£114,130 − £100,000) ÷ 2 = £7,065 lost Remaining PA: £5,505
| Earnings | Rate | Tax |
|---|---|---|
| First £5,505 | 0% (reduced PA) | £0 |
| £5,506–£50,270 | 20% | £8,953 |
| £50,271–£114,130 | 40% | £25,544 |
| Total income tax | £34,497 |
Employee NI: (£37,700 × 8%) + (£63,860 × 2%) = £3,016 + £1,277 = £4,293
Take-home: £114,130 − £34,497 − £4,293 = £75,340/year = £6,278/month
PAYE Calculation (with PA taper)
Gross salary: (£132,000 + £750) ÷ 1.15 = £115,435 PA lost: (£115,435 − £100,000) ÷ 2 = £7,718; remaining PA: £4,852
- Income tax: £35,150
- Employee NI: £4,319
- Take-home: £75,966/year = £6,331/month
Pension Strategy at £600/Day — The Priority Action
At £600/day, the company pension contribution is the single most important financial decision. A company pension contribution of £25,000–£35,000/year achieves:
- Reduces company profit → lower CT cost
- Reduces available dividends → keeps personal income below £100k with more headroom
- Builds retirement wealth at an effective cost of ~55–60p per £1 contributed
| Company pension | Personal income | PA status | Net pension cost |
|---|---|---|---|
| £0 | £99,500 (capped) | Intact | — |
| £20,000 | £89,500 | Intact | ~£11,500 |
| £35,000 | £79,500 | Intact | ~£20,500 |
Worked Example — David, Principal Consultant
David contracts at £600/day (outside IR35) as a principal strategy consultant. Annual revenue: £132,000.
Optimised company structure:
- Revenue: £132,000
- Salary + employer NI: £13,706
- Expenses: £3,000
- Company pension: £25,000
- Pre-CT profit: £90,294
- CT (effective ~23%): £20,768
- Available for dividends: £69,526
David’s income:
- Salary: £12,570
- Dividends: £69,526 (total income: £82,096 — below £100k)
- Dividend tax: (£37,200 × 8.75%) + (£31,826 × 33.75%) = £3,255 + £10,741 = £14,000 (approx — complex)
- Monthly take-home: approx £5,675 plus £25,000/year pension accumulating
David defers take-home to build retirement wealth. At 55, he can access his pension pot (now substantial) via drawdown, taxed at much lower rates in retirement.