IR35 Take-Home Pay
By Mustafa Bilgic · Updated 24 August 2026
Inside IR35, your take-home pay drops because the end client or agency deducts income tax and National Insurance before you receive a penny. Outside IR35, you draw a combination of salary and dividends through your limited company, keeping more of each invoice. The difference on a typical day rate can be thousands of pounds a year -- run the numbers with our take-home pay calculator to see your own figures.
IR35 rules change how your income is taxed, not how much you earn gross. Run both scenarios through our calculator to see the actual pound difference on your specific day rate.
What IR35 Actually Changes
IR35 does not change your gross day rate. It changes who pays the tax and how much flexibility you have over extraction. When a contract falls inside IR35, the fee-payer (usually the agency or end client) operates PAYE on 100% of your income after a flat 5% allowance for expenses. You lose access to the dividend route entirely for that engagement.
Outside IR35, your limited company invoices the client, receives the full fee, and you decide how to split drawings between a low salary and dividends. That split matters because dividends are not subject to National Insurance, which is the single largest factor in the take-home gap. HMRC's off-payroll rules have applied to the public sector since April 2017 and to medium and large private-sector clients since April 2021.
The Take-Home Gap in Practice
A contractor billing a day rate and working a standard number of days will see a measurable difference depending on IR35 status. The gap widens as the day rate rises, because National Insurance on employment income stacks up faster than the combined corporation tax and dividend tax an outside-IR35 contractor pays.
Exact figures depend on the current year's tax bands and NI thresholds -- use our take-home pay calculator with your actual day rate to get a personalised breakdown. The calculator applies current HMRC rates so you do not need to look them up manually. Remember that inside IR35 you can still claim the 5% flat-rate expense deduction, which is unique to deemed employees and partially offsets the hit.
How Your IR35 Status Gets Decided
Three tests sit at the heart of every IR35 assessment: personal service (can you send a substitute?), mutuality of obligation (must the client offer work and must you accept it?), and control (does the client dictate how, when, and where you work?). No single factor is decisive. HMRC's own Check Employment Status for Tax (CEST) tool gives a non-binding indication, though many contractors find its results frustratingly inconclusive.
For medium and large private-sector clients, the responsibility for determining status shifted to the end client in 2021. Small companies still leave the decision with the contractor's own limited company. If you disagree with a determination, you can challenge it through the client's internal status disagreement process before escalating to HMRC.
Practical Steps for Contractors
Get a written status determination from the end client before you start work. If the contract is inside IR35, factor the lower take-home into your rate negotiation -- many contractors uplift their day rate by 15-25% to compensate. If outside, keep evidence that supports your position: a genuine right of substitution clause, proof you use your own equipment, and records showing you control your working pattern.
Review every new engagement separately. A blanket inside-IR35 determination across all roles is not how the legislation works, and some clients issue these to reduce their own risk rather than assess each contract on its facts. Speak to a specialist accountant before accepting or contesting a determination -- this is not tax advice.
Not tax advice -- speak to your accountant.
Frequently asked questions
Does IR35 affect sole traders?
No. IR35 applies only to workers who provide services through an intermediary, typically a personal limited company. Sole traders are already taxed on their full trading income, so the off-payroll rules do not change their position.
Can I claim expenses inside IR35?
You can deduct a flat 5% of your gross fee to cover the costs of running your limited company. Beyond that, the expense claims available to regular employees (such as travel to a permanent workplace) do not apply to deemed employees under IR35.
Who decides my IR35 status?
For medium and large private-sector clients, the end client makes the determination. For small companies, the contractor's own limited company remains responsible. The client must provide a Status Determination Statement and give you the right to dispute it.
What happens if HMRC disagrees with my outside-IR35 status?
HMRC can open a compliance check and review the working practices of the engagement. If they conclude the contract is inside IR35, they will pursue the fee-payer (the end client or agency) for unpaid tax and NI, plus interest and potential penalties.