How UK contractor take-home pay works
Operating as an independent contractor in the UK allows you to trade either through your own personal services company (a limited company outside IR35) or via an umbrella company (typically required when a contract falls inside IR35).
When contracting outside IR35, your limited company invoices the client directly. From this gross revenue, your business deducts legitimate allowable expenses such as professional indemnity insurance, accountancy fees, software subscriptions, and necessary equipment. The standard tax-efficient remuneration structure involves drawing a low director salary aligned with the primary National Insurance threshold (£12,570), incurring zero employee or employer National Insurance while securing qualifying state pension credits.
Your company pays UK Corporation Tax on remaining taxable profits. Under current rules, profits up to £50,000 are taxed at the 19% small profits rate, profits between £50,000 and £250,000 receive marginal relief, and profits over £250,000 are taxed at the 25% main rate. The remaining post-tax profits are distributed to you as dividends, which benefit from a £500 annual tax-free dividend allowance and attract lower dividend tax rates without National Insurance.
When contracting inside IR35 or using an umbrella company, your fee is treated as deemed employment income. Employer National Insurance (15%), the Apprenticeship Levy (0.5%), and the umbrella company's weekly administration margin are deducted from the contract invoice before PAYE Income Tax and employee National Insurance are calculated on the net taxable salary.
Worked example: £500 daily contract rate over 230 billed days
Consider a contractor billing £500 per day over a typical working year of 230 billed days (allowing for holidays, bank holidays, and short contract gaps), generating £115,000.00 in gross annual revenue in the 2026-27 tax year.
Operating outside IR35 with £1,500.00 in annual allowable business expenses, your company pays £39,830.27 in combined Corporation Tax and dividend tax under current UK statutory rates.
After taxes, your outside IR35 annual take-home pay is £73,669.73 per year (£6,139.14 per month), achieving an overall retention rate of 64.06% of gross client billing.
By contrast, working inside IR35 through an umbrella company with a standard £25 weekly margin yields an annual take-home pay of £68,030.13 per year (£5,669.18 per month), with £46,969.87 in total employment deductions and taxes. Contracting outside IR35 delivers £5,639.60 in additional net cash each year.
Inputs for the contractor calculator
How you quote your contract rate
Select whether your client agreement is based on a daily billing rate, an hourly rate, or a fixed annual contract value.
Daily contract rate
Your agreed daily fee excluding VAT (e.g. £500 per day).
Invoiced days per year
The total number of days you expect to invoice in a 12-month period. Most UK contractors work between 220 and 230 days, allowing for annual leave and bank holidays.
Hourly contract rate
Your agreed hourly contract rate excluding VAT.
Invoiced hours per week
Your contracted billable hours per week, typically 37.5 or 40 hours.
Invoiced weeks per year
The number of active working weeks you expect to bill per year, typically 44 to 48 weeks.
Total annual contract value
The total gross value of the contract billed to the end client over the year before VAT.
Annual allowable company expenses (outside IR35)
Legitimate business expenses paid directly by your limited company, such as insurances, accountancy, training, and business travel.
Weekly umbrella company margin (inside IR35)
The fee charged by the umbrella company for processing payroll and statutory employment compliance, usually between £20 and £30 per week.
Tax year
The applicable UK tax year determining Corporation Tax rates, income tax brackets, dividend tax rates, and National Insurance thresholds.
Where you pay income tax
Select Scotland if you are a Scottish resident for tax purposes, as Scottish income tax rates apply to employment salary.
Student loan repayment plan
Select any student loan plan you hold with the Student Loans Company. Repayments apply to deemed umbrella salary and limited company salary above plan thresholds.
CALCULATOR QUESTIONS
Contractor calculator questions
What is the most tax-efficient way to pay myself as a contractor?
Most limited company contractors draw an annual salary up to the National Insurance Primary Threshold (£12,570 in 2026-27), which incurs zero income tax and zero employee or employer National Insurance while earning state pension credits. Remaining company profits after Corporation Tax are distributed as dividends, which do not attract National Insurance.
How does Corporation Tax affect limited company contractor profits?
Corporation Tax is paid on company profits after allowable business expenses and director salary. Profits up to £50,000 are taxed at 19%, profits between £50,000 and £250,000 are taxed with marginal relief, and profits above £250,000 are taxed at the 25% main rate.
Can I claim business expenses if I work inside IR35?
Under UK off-payroll legislation, workers deemed inside IR35 are treated as employees for tax purposes. Supervision, Direction, or Control (SDC) rules severely restrict tax relief on travel, subsistence, and home-office costs for inside IR35 roles compared to outside IR35 contracts.
What is the 5% deemed expense deduction for small clients?
If you contract with a small private-sector client where you remain responsible for determining your own IR35 status under Chapter 8 of ITEPA 2003, a statutory 5% deduction for general company administration costs is permitted when calculating deemed employment payments.