UK Contractor Day Rate Calculator (2026/27)

Worked example

How the day rate calculator works

A day rate on its own tells you very little. This calculator turns it into three numbers you can actually make decisions with, all on 2026/27 rules for England, Wales and Northern Ireland.

Gross annual contract value is the simplest: your day rate multiplied by the number of days you invoice in a year. At £500 a day over 220 billable days that is £110,000. This is company turnover, not your salary, and not money you keep - corporation tax, National Insurance and personal tax all come out before it reaches your bank account.

Permanent-salary equivalent answers the question every contractor is asked: "what's that in a real job?" There is no official conversion, so the calculator uses a transparent rule of thumb. It divides the annual contract value by a benefits loading of roughly 1.25 to 1.30. That loading reflects the things a permanent employer funds that a contractor pays for themselves: pension contributions, paid holiday, sick pay, notice periods and the security of not sitting on the bench between contracts. £110,000 of contract income lands near an £85,000 permanent package on this basis. Treat it as a conversation-starter, not a precise figure, because the right loading depends on how generous the permanent benefits are.

Take-home is the number that matters most, and it depends entirely on your IR35 status. Outside IR35, you can run the tax-efficient limited company structure of a low salary plus dividends. Inside IR35, the fee is taxed like employment income and the dividend advantage disappears. The calculator models both so you can see the gap in cash terms rather than guessing.

Enter your day rate, adjust the billable days to something realistic for your sector, and pick your IR35 status. The result set gives you the full stack: turnover, the perm equivalent, and net take-home after corporation tax, National Insurance and personal tax. Because YMYL tax rules change every April, the underlying rates - personal allowance £12,570, dividend allowance £500, corporation tax marginal relief between £50,000 and £250,000 - are all fixed to the 2026/27 tax year and sourced from GOV.UK. Always confirm your own position with an accountant before signing a contract.

Choosing your billable days: why the default is 220, not 260

The single biggest driver of your annual figure - after the rate itself - is how many days you actually bill. Get this wrong and every downstream number is wrong, which is why the calculator defaults to a conservative 220 rather than a full working year.

A calendar year contains roughly 260 weekdays (52 weeks x 5 days). No contractor bills all of them. Start subtracting the real world:

• Public holidays: England and Wales have 8 bank holidays. Most clients do not pay you for days you do not work, so that is 8 days gone straight away, taking you to about 252.
• Holiday you actually take: a permanent employee gets 25-28 paid days off. A contractor gets zero paid leave - every day off is unbilled. Take even 20 days and you drop to around 232.
• Bench time between contracts: almost no one moves from one engagement to the next with no gap. A two-to-three week gap once a year quietly removes another 10-15 days.
• Illness and training: no statutory sick pay funds your own limited company, and you fund your own certifications and course days. A handful of days here is realistic.

Stack those up and 220 billable days is a sensible, slightly cautious planning figure for a contractor who is reasonably well utilised. If you are in a long, stable engagement with minimal gaps you might genuinely bill 230-240; if your sector has choppy demand or long sales cycles, 200 or even 180 is safer.

The reason this matters so much: billable days scale the entire calculation linearly. At £500 a day, every 10 days of difference is £5,000 of turnover, which after corporation tax and dividend tax is roughly £3,000 of take-home. Modelling 260 days when you realistically bill 220 overstates your annual take-home by well over £10,000 and can make a contract look better than a permanent role when it is not. When you compare an offer against a salaried job, always run the billable-days figure you honestly expect to hit, then sanity-check the answer at a slightly lower number to see how exposed you are to a quiet quarter.

Outside IR35: how salary plus dividends is taxed in 2026/27

When a contract is genuinely outside IR35, you control how money leaves your limited company, and the standard tax-efficient approach is a low salary topped up with dividends. Here is exactly how the 2026/27 rules stack up.

The salary. Most one-person companies set a director's salary of £12,570 - the personal allowance - so no income tax is due on it. Employee National Insurance also starts at £12,570, so there is none. There is a small cost: employer National Insurance is charged at 15% on earnings above the £5,000 secondary threshold, so £12,570 triggers (£12,570 − £5,000) x 15% = £1,135.50. Crucially the Employment Allowance that would wipe this out is not available to a company whose only employee is a single director, so most contractors simply absorb it. The salary and the employer NI are both deductible against corporation tax, which softens the blow. Some contractors instead pay just £5,000 to avoid employer NI entirely, at the cost of wasting part of the personal allowance.

Corporation tax. Whatever profit remains after salary, employer NI and genuine business expenses is taxed before you can pay dividends. For 2026/27 the small profits rate is 19% up to £50,000 and the main rate is 25% above £250,000. Between those figures you pay 25% reduced by marginal relief of 3/200 of the gap to £250,000, giving a rising effective rate. A £96,000 profit, for instance, carries an effective rate of roughly 22.6%.

Dividends. Dividends are paid from post-corporation-tax profit and stack on top of your salary for personal tax. The first £500 is covered by the dividend allowance and taxed at 0%. After that the rates are 10.75% inside the basic-rate band (total income up to £50,270), 35.75% in the higher-rate band (£50,270 to £125,140), and 39.35% above £125,140. The ordinary and upper rates each rose by 2 percentage points on 6 April 2026. Because your salary already uses the personal allowance, dividends are taxed from the first pound of the basic-rate band.

The combined effect used to be a clearly lower total tax burden than employment. After the April 2026 dividend rate rise that gap has narrowed sharply, and at higher day rates the salary-plus-dividends route can now leave you no better off than PAYE on the same fee - run your own numbers rather than assuming an advantage. Watch two thresholds: crossing £50,270 pushes dividends to 35.75%, and crossing £100,000 starts tapering your personal allowance, both of which sharply raise the marginal cost of the next pound. Pension contributions made by the company are a common, legitimate way to manage profit around those points.

Inside IR35 versus outside IR35: the take-home gap

IR35 status is the biggest lever on your net pay, often worth more than a £50-a-day rate change. The rules exist to stop "disguised employment" - people working like employees but paying tax like a business. Getting the status right is a YMYL decision with real financial and legal consequences, so understand what each side means.

Outside IR35 means HMRC accepts you are genuinely in business on your own account: you have a real right of substitution, control over how you work, no mutuality of obligation, and you carry commercial risk. You can then use the salary-plus-dividends structure described above and retain roughly 60-65% of turnover at typical mid-range day rates.

Inside IR35 means the engagement is, for tax purposes, employment. Since April 2021 for medium and large private-sector clients (and all public-sector clients), the client or agency decides your status and, if inside, deducts income tax and employee National Insurance through PAYE before paying your company - a "deemed direct payment". You lose the dividend route almost entirely: the money has already been taxed as employment income, so paying it out as salary or dividend makes little further difference. The old 5% expenses allowance was removed for these engagements, so there is little to offset.

In cash terms, take the £500-a-day, 220-day example. Outside IR35 the model nets around £69,900. Taxed inside IR35 as employment income - with the personal allowance tapered to £7,570 because income exceeds £100,000, then 20% to £50,270 and 40% above, plus employee NI at 8% then 2% - the same £110,000 nets roughly £72,400 before the fee payer's own employer NI is accounted for. Since the April 2026 dividend rise the outside-IR35 structure no longer wins automatically at this level. In practice agencies frequently deduct or price in that employer NI, so a headline "inside IR35" rate often needs to be materially higher than an outside rate to leave you level. That is why many contractors quote a different rate for inside-IR35 work.

Two practical points. First, status is decided engagement by engagement, not for you as a person - you can hold an outside and an inside contract in the same year. Second, if you are inside IR35, an umbrella company is often simpler and no less tax-efficient than running a limited company, because the limited company gives you no advantage on that income. Use HMRC's Check Employment Status for Tax (CEST) tool and, given the sums involved, take professional advice before relying on an outside determination.

Frequently asked questions