Contractor Take-Home Calculator 2026/27 | Outside vs Inside IR35

For Outside IR35 contractors operating via a limited company (PSC), take-home pay combines a low director salary (typically £12,570 to utilize the Personal Allowance without employee NI) and company profit distributed as dividends after 19% to 25% Corporation Tax. Dividends are taxed at 10.75% (basic) or 35.75% (higher) above a £500 allowance. Inside IR35 contractors are paid via deemed employment or an umbrella company, where employer NI (15% above £5,000), apprenticeship levy (0.5%), and umbrella margins are deducted from the assignment rate before standard PAYE income tax and employee NI are applied.

On a £500 day rate (5 days/week, 46 weeks = £115,000 turnover), an Outside IR35 contractor with a single director taking a £12,570 salary achieves £72,293.19 in net take-home pay (paying £23,093.04 Corporation Tax with marginal relief and £18,478.27 Dividend Tax). An Inside IR35 umbrella contractor billing the same £115,000 takes home £68,105.45 net after employer deductions and PAYE, representing an Outside IR35 financial advantage of £4,187.74 per year (£348.98 per month).

The ‘IR35 shock’ is the sudden drop in net take-home income when a contract shifts from Outside IR35 to Inside IR35. Because the fee-payer or umbrella passes employer National Insurance (15% on earnings above £5,000) and the Apprenticeship Levy (0.5%) onto the contractor’s gross contract rate, contractors typically suffer a 15% to 25% reduction in net cash in pocket for the exact same day rate.

Single-director personal service companies (PSCs) with no other employees are legally barred from claiming the £10,500 Employment Allowance under Section 165 of the National Insurance Contributions Act 2014. If a company employs two or more directors or staff members each earning above the secondary threshold (£5,000), the company may qualify to offset secondary employer Class 1 National Insurance.

No. Under statutory off-payroll working reforms (Chapter 10 ITEPA), the historical 5% deduction for general company expenses was abolished for all public sector and medium/large private sector engagements. It only remains available for contracts with small private sector end-clients assessed under original Chapter 8 rules.

Corporation Tax is charged at 19% on company profits up to £50,000 (small profits rate) and 25% on profits over £250,000 (main rate). Profits between £50,000 and £250,000 qualify for marginal relief using a standard 3/200 fraction, creating an effective marginal tax rate of 26.5% on profits within this band for a standalone UK company with no associated businesses.

An Outside IR35 contract means HMRC considers you a genuine independent contractor operating a business to business service through your limited company (PSC). You can withdraw income via a mix of salary and dividends, claim legitimate business expenses, and manage your own Corporation Tax. An Inside IR35 contract means the engagement resembles deemed employment; all payments are subject to PAYE Income Tax and National Insurance, and the fee-payer or umbrella company passes Employer National Insurance (15% above £5,000) and the Apprenticeship Levy (0.5%) onto your contract assignment rate.

On average, Outside IR35 contractors take home 15% to 25% more net cash than Inside IR35 contractors billing the exact same daily rate. For example, at £500 per day over 46 weeks (£115,000 turnover), an Outside IR35 director retains £72,293.19 take-home compared to £68,105.45 under an Inside IR35 umbrella — a net financial gain of £4,187.74 per year (£348.98 per month) due to lower dividend tax rates, absence of employer NI on dividends, and corporation tax efficiency.

For a standalone single-director limited company with no other employees in 2026/27, the optimal annual director salary is £12,570. At £12,570, you utilise 100% of your tax-free Personal Allowance (£12,570), pay £0 employee Class 1 NI (as it matches the Primary Threshold), and build a qualifying year toward the UK State Pension (earning above the Lower Earnings Limit of £6,500). Because single directors cannot claim the £10,500 Employment Allowance, the company pays £1,135.50 in secondary Employer NI (15% on £7,570 above the £5,000 secondary threshold), which is fully deductible against Corporation Tax.

Outside IR35 limited company contractors can claim business expenses incurred wholly, exclusively, and necessarily for the business, including professional indemnity insurance, accountancy fees, business equipment (computers, phones), business travel and accommodation between temporary workplaces, and company pension contributions. Conversely, Inside IR35 umbrella contractors cannot claim travel or subsistence to client sites due to statutory supervision, direction, or control (SDC) rules under Chapter 10 ITEPA, and the historical 5% unvouched expenses allowance is legally abolished.