What Inside IR35 Costs at £1350/Day
£1350/day across 220 working days is £297,000 a year. Inside IR35 that whole amount is taxed like a salary (typically via an umbrella company): at 2025/26 rates (thresholds frozen to 2028) you pay £119,853 income tax and £7,951 employee National Insurance, keeping £169,196 — 57.0% of gross. Outside IR35, running the same contract through your own limited company with an optimised salary-plus-dividends structure typically retains around 78% — about £231,660 a year. The gap of roughly £62,464 works out at £284 for every day you work. Run your own split in the IR35 calculator.
The Maths Behind the Numbers
At £297,000 — about 8.5 times the UK median full-time salary of roughly £35,000 — every marginal pound inside IR35 loses 47p (45% additional-rate tax plus 2% NI). The personal allowance was fully withdrawn back at £125,140, so the 60%+ marginal zone between £100,000 and £125,140 is already priced into the figures above. That is why the inside-IR35 effective deduction rate reaches 43.0% here, and why status determinations matter so much more at £1350/day than at £500/day.
Can You Improve Either Position?
Pension contributions are the single most effective tax lever at this income, with relief at your 47% marginal rate. At £297,000 your adjusted income sits above HMRC's £260,000 taper threshold, so per gov.uk guidance your annual allowance is cut by £1 for every £2 above the line — roughly £41,500 here rather than the standard £60,000 (assuming no other income or pension accrual). Contributions beyond the tapered allowance trigger an annual allowance charge, though carry-forward of unused allowance from the previous three tax years can extend the headroom. If you work outside IR35, employer contributions made directly from your limited company are corporation-tax deductible and never touch the dividend chain, which makes them doubly efficient — but they still count towards adjusted income for the taper. Inside IR35, some umbrella companies offer salary sacrifice into a pension, which restores relief at the full marginal rate — worth asking before you sign. Read our complete contractor IR35 guide for how status is assessed, and the high-earner tax tips and £100k tax trap guides for the wider planning picture.
Day Rates Compared
| Day Rate | Outside IR35/mo | Inside IR35/mo | Annual Loss |
|---|---|---|---|
| £1150/day | ~£16,445 | £12,156 | £51,464 |
| £1200/day | ~£17,160 | £12,642 | £54,214 |
| £1250/day | ~£17,875 | £13,128 | £56,964 |
| £1300/day | ~£18,590 | £13,614 | £59,714 |
| £1350/day | ~£19,305 | £14,100 | £62,464 |
| £1400/day | ~£20,020 | £14,586 | £65,214 |
| £1450/day | ~£20,735 | £15,071 | £67,964 |
| £1500/day | ~£21,450 | £15,557 | £70,714 |
| £1550/day | ~£22,165 | £16,043 | £73,464 |
See also the £1350 day rate take-home breakdown, the £1350/day permanent salary equivalent, or browse all IR35 rate comparisons.
FAQs
How much does inside IR35 cost on £1350/day?
Roughly £62,464 a year. Inside IR35 you take home about £169,196 (£14,100/month), while outside IR35 through a limited company you could keep around £231,660 (~£19,305/month) at a typical ~78% retention.
What is the take home for £1350/day inside IR35?
£14,100/month. £1350/day across 220 days is £297,000 gross; income tax of £119,853 and National Insurance of £7,951 at 2025/26 rates (thresholds frozen to 2028) leave £169,196/year.
Why is the outside IR35 figure an estimate?
The ~£19,305/month figure assumes roughly 78% retention through an optimised salary-plus-dividends structure. Actual retention depends on your salary/dividend split, corporation tax, allowable expenses and how much profit you retain in the company.