Inside vs Outside IR35 in 2026: How Much More Do You Need to Charge to Break Even?

Summary

Comparing your inside vs outside IR35 day rate typically points to an uplift of roughly 25% to 38% to match your previous annual take-home pay. The gap widened after April 2025, when employer National Insurance rose to 15% and the threshold dropped to £5,000. Your exact figure depends on your expenses, pension contributions and how efficiently your company was extracting profit.

You have been offered a new contract. The rate looks similar to your last one, but the paperwork says "inside IR35". It is easy to assume that the number on the offer is the number that matters, but it is not.

The same headline day rate can leave you £5,000 or more a year worse off once it passes through an umbrella company and payroll. The real question is how much extra you need to ask for to end up with the same money in your bank account. You can test your own figures with our IR35 Inside vs Outside Take-Home Calculator UK as you read. It takes about ten minutes, and it is far better done before you reply to an agency than after your first payslip.

Why the Maths Changed in April 2025

For years, contractors had a rough rule of thumb for the inside IR35 uplift. That rule was quietly broken by changes to employer National Insurance, and many agency quotes have not caught up.

The Employer NI Squeeze

The Autumn Budget 2024 raised employer National Insurance from 13.8% to 15%. It also cut the Secondary Threshold, which is the point where employers start paying it, from £9,100 to £5,000 a year. Both changes took effect in April 2025 and remain relevant to the 2026 to 2027 employer rates.

On an inside IR35 contract paid through an umbrella, that cost lands inside your day rate. An umbrella company cannot create money from nowhere, so it works backwards from the assignment rate and deducts its own costs before your pay is calculated. Those deductions now start earlier and bite harder.

The main employer-side costs that can come out of an assignment rate are:

• Employer National Insurance at 15% on pay above £5,000 a year.
• The Apprenticeship Levy at 0.5%, where the employer’s annual pay bill exceeds £3 million, after its levy allowance.
• The umbrella company margin, typically £25 to £35 a week.

Frozen Tax Thresholds

Income tax thresholds remain frozen for the 2026 to 2027 tax year. The key figures are:

• The personal allowance of £12,570.
• The higher rate threshold of £50,270.
• The additional rate threshold of £125,140.

Frozen thresholds matter because any rate uplift pushes more of your income into higher bands. The extra slice you negotiate on an inside contract will usually be taxed at 40%, and the personal allowance starts to taper once income exceeds £100,000. It is always worth confirming the current income tax figures on GOV.UK before you commit.

That is why the break-even uplift is not a simple percentage sum. Each extra pound you negotiate is taxed at your marginal rate, so you need to ask for more than the gap you can see.

Inside vs Outside IR35 Day Rate: Where the Inside Rate Goes

When an agency quotes you a day rate for an inside contract, it is almost always the assignment rate. That is the total the umbrella receives, not the amount you will be paid.

The Assignment Rate Trap

Think of the assignment rate as a pot that has to cover several things before you see a penny. It pays the umbrella, then the government, and only then you.

The order of deductions usually runs like this:

1. The umbrella company takes its weekly margin.
2. Employer National Insurance and, where applicable, the Apprenticeship Levy are calculated and set aside.
3. The remainder becomes your gross pay, which includes holiday pay.
4. Employee National Insurance is deducted at 8% up to £50,270 and 2% above it.
5. PAYE income tax is deducted at 20%, 40% or 45% depending on your income.

Understanding that order matters when you negotiate. If an agency says "we can offer £550 inside", ask whether that is the assignment rate or your gross pay. At 220 working days, confusing the two can cost you well over £10,000 a year in expected income.

Holiday Pay and Umbrella Margins

Statutory holiday pay accrues at 12.07% of your pay under most umbrella arrangements. It either sits in a holiday pot you draw on when you take time off, or it is rolled up into each payslip. Either way, it is part of your gross pay rather than an extra on top.

A rolled-up payslip can look generous while hiding the fact that nothing is set aside for time off. Our guide to part-time holiday entitlement and bank holiday mistakes explains how holiday accrual calculations catch people out, and the same logic applies to short-term and irregular contracts.

Questions worth asking about holiday pay and margins include:

• Is holiday pay paid at the point of leave or rolled up in each payment?
• Is the weekly margin fixed, or does it change if you are between contracts?
• Are there any extra fees for payslips, expenses processing or early payment?

What £100 Looks Like

Here is a rough illustration for a higher-rate taxpayer. Out of every £100 of assignment rate, about £1 to £2 goes to the umbrella margin and around £13 to employer National Insurance and the levy, where it applies. Roughly £35 to £36 then goes in income tax and employee National Insurance. That leaves about £50 in your bank account.

These figures vary with your annual earnings and how long you work, so treat them as a sense check rather than a promise. They do show why a flat "add 10%" uplift does not come close to restoring your old position.

A few points to take from this picture:

• Roughly half of every extra pound you win in negotiation reaches you at higher-rate level.
• Employer costs are the same whether you are a basic or higher-rate taxpayer.
• The more you earn, the less the next pound is worth to you.

How Outside IR35 Keeps More of the Money

Outside IR35, you run your own limited company. You invoice the client and pay yourself, and the company, rather than an umbrella, bears the employment costs. That structure gives you several levers that PAYE does not.

Salary, Dividends and Corporation Tax

A typical outside IR35 contractor pays a modest salary and takes the rest as dividends. Dividends are taxed at lower rates than salary and do not attract National Insurance. For 2026 to 2027, dividend income above the £500 dividend allowance is taxed at 10.75% in the basic-rate band, 35.75% in the higher-rate band and 39.35% in the additional-rate band. The company pays corporation tax on its profits first, at rates that depend on its size.

This is not a loophole. It is simply how company ownership is taxed in the UK. It does, however, mean your take-home pay is shaped by choices that an employee on PAYE never gets to make.

The main differences are:

• You decide how much salary and how much dividend to take each year.
• Employer National Insurance applies only to the salary you choose to pay.
• You can leave profits in the company and take them in a later tax year.

Expenses, Pensions and Retained Profit

An outside IR35 company can claim legitimate business expenses, such as accountancy fees, insurance and equipment. It can also make employer pension contributions, which are a business cost and do not count as taxable income for you. These items explain much of the gap between inside and outside.

If you were making full use of them, your outside position was better than a plain salary comparison suggests, which raises the uplift you need. Contractors who ran lean companies with few expenses will find the gap narrower.

Before you calculate your break-even, gather these items:

1. Your last full year of company turnover and the days you billed.
2. Your salary, dividends and any employer pension contributions.
3. Your real business costs, including accountancy and insurance.
4. Any corporation tax and dividend tax you paid.

Inside vs Outside IR35 Day Rate: Break-Even Examples

Now to the question in the title. A 25% to 38% uplift is a useful negotiating range for some post-April 2025 comparisons, but it is not a universal IR35 break-even day rate. Personal circumstances, including what you count as outside income, differ too much.

The 25% to 38% Range

At the lower end sit contractors with few expenses, no company pension contributions and a modest day rate. At the higher end sit those who extracted profit tax-efficiently, paid employer pension contributions and claimed legitimate business costs. The bigger your outside advantage, the bigger the uplift you need.

The number of days you work matters too. Fewer billable days mean fixed costs such as the umbrella margin take a larger bite, while longer, steadier contracts narrow the gap slightly.

What pushes you towards the top of the range:

• Claiming meaningful business expenses through your company.
• Making employer pension contributions.
• Leaving profits in the company for later years.
• Short or gappy contracts where the umbrella margin weighs heavily.

Worked Day-Rate Examples

Here is a calculated comparison for three outside IR35 day rates. It assumes 220 billable days across 44 weeks in 2026 to 2027, a £12,570 company salary, £1,200 in annual company costs, no pension contributions and all remaining post-tax profit paid as dividends. The inside calculation assumes a £30 weekly umbrella margin, 15% employer NI above £5,000, a 0.5% Apprenticeship Levy charged within the assignment rate, and standard England, Wales or Northern Ireland PAYE and employee NI. It includes the personal allowance taper where relevant.

These lean-company results are narrower than the 25% to 38% range. They match cash taken home, not the value of pension contributions, retained company profit or other benefits. Change those assumptions, or remove the levy where it does not apply, and the break-even rate changes too.

Many agencies will not move as far as your own calculation requires, because their client has a fixed budget. That is where the decision becomes personal. You either accept lower take-home pay, negotiate part of the gap, or decline the contract.

A Real-World Example

Consider Sarah, a business analyst from Manchester, whose figures are illustrative but typical. She had been billing £450 a day outside IR35 for about 220 days a year, with her company paying £10,000 a year into her pension. Her renewal came back inside IR35 at £495, a 10% uplift that her agency described as "generous".

When Sarah compared her take-home pay and pension together, the £495 offer left her roughly £5,500 a year worse off. Her own break-even assignment rate came out at around £550 to £560. She sent the agency her working, negotiated £530 with a rate review after three months, and accepted a shortfall of about £2,000 a year in exchange for a secure 12-month contract. The difference is that she chose that trade-off knowingly, rather than discovering it on her first payslip.

When you compare offers yourself, a simple sequence helps:

1. Work out your outside annual net income, including pension, from the last year.
2. Estimate your net income on the new rate through an umbrella.
3. Find the assignment rate that closes the gap.
4. Compare that rate with the agency's budget.

Building Your Own Number

You can do a rough version of this on paper. Start with the annual take-home pay you want to match, then work backwards through tax, National Insurance and umbrella costs to the assignment rate. It takes some patience, but it gives you a figure you can defend in a negotiation.

For a faster answer, our IR35 Inside vs Outside Take-Home Calculator UK does the working for you and lets you adjust days worked and expenses. Try a few scenarios with different day counts, because that is often where the answer changes most.

A tidy process to follow:

1. Pick a realistic number of billable days after holidays and gaps.
2. Enter your outside rate, expenses and pension contributions.
3. Note your net annual income as the target.
4. Test inside assignment rates until you match that target.
5. Write down the result and add a small margin for contract gaps.

Negotiating and Decision Checklist

Knowing the number is only half of it. The other half is deciding what to do when the offer does not reach it, and timing matters here. Once you sign, the rate is usually fixed for the full term, so the strongest moment to negotiate is before you accept.

Before You Accept an Inside Offer

Start by asking whether the status decision is correct. Since April 2021, medium and large private sector clients decide whether a contract falls inside IR35. They must give you a Status Determination Statement with their reasons, and you have the right to challenge it.

If you think the decision is wrong, put your reasons in writing. The client has 45 days to respond to a formal challenge, so raise it as early as possible rather than waiting until the contract has started. Challenging a determination is a normal, legal process and does not mark you as difficult to work with.

Questions to ask the client or agency include:

• Why was this role determined inside IR35?
• Is the decision based on this specific contract or a blanket policy?
• Will the rate change if the decision is reversed?

Questions for the Umbrella and Agency

If the contract stays inside, shop around for the umbrella rather than letting the agency choose for you. Margins, holiday handling and payment dates all differ, and switching before you start is usually straightforward.

Ask each umbrella for a clear illustration of your pay on the assignment rate you are being offered. It should show employer National Insurance, the margin and the Apprenticeship Levy if it applies. If a firm will not provide that breakdown, walk away.

Things to check include:

• That the firm is a member of a recognised industry body.
• That your payslip clearly shows PAYE, National Insurance and holiday pay.
• That there are no unexplained deductions or loan arrangements.

When to Walk Away

Some contracts will not reach your break-even point whatever you do. If the client's budget is fixed and the maths leaves you well short, you can decline, negotiate a shorter inside term, or look for roles with a fair outside determination.

Think about the opportunity cost too. A contract that pays 15% less than your target may still be worth taking after a long gap. A contract that pays 15% less and ties you up for a year might not be.

Your options when the rate falls short:

• Counter with your calculated assignment rate and show the working.
• Ask for a shorter contract or a rate review point.
• Request non-cash benefits such as flexible working or training.
• Decline and keep looking for outside or higher-paying roles.

Whichever way you go, base the decision on real numbers rather than gut feeling. A contract you accept with your eyes open is far better than a surprise on your first payslip.

Conclusion

Moving inside IR35 in 2026 is not a small adjustment. Higher employer National Insurance, a lower threshold and frozen tax bands can create a substantial gap, especially when your outside comparison includes pension contributions or retained profit. For someone on £450 a day, accepting a token 10% rise can quietly cost around £5,000 a year.

You may worry that pushing back will cost you the role. In practice, agencies expect contractors to query inside rates, and a calm counter-offer backed by figures is treated as professional rather than awkward. Checking your numbers costs nothing and commits you to nothing.

Your next steps take about 15 minutes:

1. Put your figures through our IR35 Inside vs Outside Take-Home Calculator UK to find your break-even assignment rate.
2. Email the agency to confirm whether the quoted rate is the assignment rate or gross pay.
3. Ask two or three umbrella companies for a full pay illustration.
4. Reply to the offer with your calculated rate and your working.

If you are paid in a foreign currency or send money abroad as part of your contracting life, our guides on currency converter mistakes and hidden costs and sending money abroad from the UK will help you keep more of what you earn. A good rate means little if fees quietly take a slice on the way.

Sources

• GOV.UK: Understanding off-payroll working (IR35)
• GOV.UK: Rates and thresholds for employers 2026 to 2027
• GOV.UK: Income Tax rates and allowances
• GOV.UK: Tax on dividends
• GOV.UK: Corporation Tax rates
• GOV.UK: Apprenticeship Levy
• GOV.UK: Working through an umbrella company