Contracting vs Permanent in Finance: Honest Comparison

Every qualified accountant considers contracting at some point, usually after seeing a day rate that looks like double their salary. The arithmetic is more complicated than that, and so is the decision. Contracting genuinely pays more for the right person in the right market; it also removes a great deal that permanent employment provides quietly and that people only notice once it is gone. This guide sets out the comparison honestly — the money after everything, the security, the tax position, the career effects — so you can decide on the facts rather than on a day rate.

The money, properly compared

The headline comparison is misleading because a day rate and a salary are not the same unit. Work it through.

The honest summary: at 210 billable days a £500 rate produces meaningfully more gross than an £80,000 salary, and after adding back pension, bonus and benefits the gap narrows considerably — but it is still a gap, and in a busy market it is a real one. The risk sits in the billable-days number. At 160 days the comparison reverses; at 240 it widens sharply. Contracting pays more in exchange for carrying the utilisation risk yourself. Day rates by role are in our interim finance rate card.

Work out your realistic billable days before you look at any day rate, because that number decides the whole thing. Contractors who bill 220 days do considerably better than the permanent equivalent; contractors who bill 150 do worse, and no rate fixes that.

Day rates against salaries by role

A common rule of thumb multiplies a day rate by 200 to 250 to find the “equivalent” salary. It is a rough guide at best. The table below sets the interim day rates we see against the permanent salaries for the same roles, so you can see where contracting pays a genuine premium and where it barely does.

Two things stand out. At management accountant and financial accountant level, 200 billable days at a typical rate lands close to the permanent salary before any benefits are counted, so the case for contracting rests on flexibility and experience rather than money. From financial controller upwards the premium is real — which is why most contractors who do well have five or more years post-qualification behind them. Role detail is in our guides to interim FC day rates, interim financial accountant rates and finance manager day rates against salary, and permanent benchmarks in the financial controller salary guide.

A worked year: earnings after gaps, holidays and pension

The table below is illustrative. It compares one permanent financial controller with the same person contracting at £500 a day, either outside IR35 through their own limited company or inside IR35 through an umbrella company. All figures are before personal income tax, and the tax treatment of each route is different, so take advice on your own position.

First, the days. There are about 252 weekdays in a year once the eight bank holidays are taken out. Take 25 days’ holiday and you have 227. Allow five days for illness, training and admin and you have 222. Allow 22 days — just over four weeks — between assignments and you are at 200 billable days. That is a solid but not exceptional year.

Inside IR35 the umbrella is your employer, so the employer’s NI (15% above £5,000 a year), the apprenticeship levy (0.5%) and its own margin all come out of the assignment rate before your gross pay is set. That is why the same £500 a day is worth about £10,700 a year less inside IR35 than outside it in this example — before the different personal tax treatment is considered.

Now flex the days, holding everything else the same:

On these assumptions, outside IR35 you need about 196 billable days to match the permanent package; inside IR35 you need about 220 just to draw level, and in a lean year you are well behind. The figures change with the rate, the bonus you would give up and the pension you would lose, but the shape of the answer rarely does: contracting inside IR35 at a rate that only looks like a premium is usually worse than the permanent job.

What contracting genuinely gives you

Higher earnings in a busy market, as above — and the ability to raise your rate as your reputation builds, which is more responsive than an annual review.

Variety and pattern recognition. Four businesses in three years teaches you more about what works than one business for much longer. Interims develop judgement faster than permanent equivalents, and it is genuinely marketable.

Defined scope with an end. You arrive, do the thing, hand over, leave. No performance cycle, no politics you have to live with for years, no five-year plan you are asked about.

Control over your time. Gaps between assignments are unpaid, but they are yours. Contractors take three weeks off without asking anyone.

And a faster route to seniority in some cases. Businesses will hire an interim into a stretch role they would not risk permanently, because the commitment is bounded. Plenty of first FC and FD experience is acquired this way.

What it takes away

The part most articles skate over.

Income certainty. Not just the gaps — the not knowing. An assignment ending at four weeks’ notice with nothing lined up is a genuinely different experience from a secure salary, and some people find it corrosive regardless of the arithmetic.

Employment protection. No redundancy rights, no unfair dismissal protection, minimal notice. If the client’s budget changes, the arrangement ends.

Pension and benefits. Self-funded, and easily neglected. Contractors who do not deliberately replicate the employer contribution are quietly worse off than the day rate suggests.

Mortgage and credit friction. Lenders treat contractors differently, and typically want two to three years of accounts or a track record of renewed contracts. Worth knowing before a house purchase rather than during one.

Development and belonging. No study support, no formal training, no team that is yours, and no one invested in your progression. Some find that liberating; others find it isolating after two years.

And the constant business development. Even fully booked, the pipeline needs attention, because assignments end.

IR35 and how you get paid

The tax position determines a large part of the real economics, and it needs understanding before you decide.

Contractors typically work through their own limited company or an umbrella company. Where an assignment is outside IR35, you can take income as a mix of salary and dividends through your company, which is generally more tax-efficient. Where it is inside IR35, income is taxed broadly as employment income, and the advantage over a salary narrows considerably — frequently to the point where an equivalent permanent role is better once benefits are counted, as the worked year above shows.

Two things to understand. For medium and large clients, the client determines the status, not you, and the determination must reflect the actual working arrangement rather than the contract label. And blanket inside-IR35 determinations are common in risk-averse organisations, which is why the same nominal rate can be worth very different amounts depending on the engager. HMRC’s off-payroll guidance is the primary source, and our guide to IR35 and employment tax covers the framework. Take proper advice from an accountant before setting up — this is one area where the general guidance genuinely does not substitute for advice on your circumstances.

The off-payroll rules since April 2021

The off-payroll working rules have applied in the public sector since April 2017 and were extended to medium and large private-sector clients from 6 April 2021. Under them the client decides whether an engagement would be employment if the contractor were engaged directly, issues a status determination statement, and whoever pays your limited company — usually the agency — deducts tax and NI if the role is inside. Small private-sector clients are exempt, and the contractor’s own company makes the decision instead. Whether a client counts as small follows the Companies Act size tests; the higher thresholds introduced in April 2025 (turnover up to £15m, balance sheet up to £7.5m, no more than 50 employees, meeting two of the three) have fed into the off-payroll rules from April 2026, which moved some clients back into the small category. HMRC’s Check Employment Status for Tax tool is what most clients use as a starting point.

Status turns on the real working arrangement: whether you can send a substitute, how much control the client has over how, when and where you work, and whether there is a mutual obligation to offer and accept work. A finance interim covering a vacant seat, managed day to day like an employee, will usually be inside. A defined project — a systems implementation, a remediation, an audit-readiness piece — with your own methods and a clear deliverable has a better chance of being outside.

Umbrella companies and the April 2026 change

Inside-IR35 work is commonly paid through an umbrella company, which employs you, invoices the agency and runs PAYE on your pay. From 6 April 2026, under the Finance Act 2026, the recruitment agency that supplies you — or the end client, if it contracts with the umbrella directly — is jointly and severally liable for any PAYE and NI the umbrella fails to pay. In practice agencies are tightening their approved umbrella lists and their checks. For contractors the message is simple: use a compliant umbrella on your agency’s list, check that your payslip shows full PAYE deductions, and treat any arrangement promising unusually high take-home pay as a warning sign. HMRC’s guidance on working through an umbrella company explains what a payslip should show. Further regulation of umbrella companies is planned.

Limited company or umbrella

A limited company makes sense if most of your work will be outside IR35 and you are prepared to run it properly — corporation tax is 19% on profits up to £50,000 and 25% above £250,000, with marginal relief between, and dividend tax rates rose by two percentage points from April 2026, so the extraction mix needs annual review. If your work is mostly inside IR35, an umbrella is usually simpler and the company adds cost without much benefit. Our guide comparing umbrella, PSC and fixed-term arrangements goes into the detail.

Pensions when you contract

This is the cost contractors most often forget. A permanent employer paying 5% of an £80,000 salary is putting £4,000 a year into your pension that you never see on a payslip. Contract without replacing it and you are £4,000 a year worse off than the day rate suggests — every year, compounding.

Through a limited company, employer pension contributions are usually an allowable business expense for corporation tax and carry no NI, which makes them one of the most efficient ways to extract profit. Through an umbrella you will be auto-enrolled, but contributions are often calculated on minimal qualifying earnings, so most people top up personally. Either way the pension annual allowance — £60,000 for most people, including employer contributions — sets the ceiling for tax-relieved saving. A sensible discipline is to set aside the equivalent of what your last employer paid, plus your own contribution, as a standing order from the first month of the first assignment.

Mortgages and borrowing

Lenders have become more used to contractors, but the approach varies. Mainstream lenders may want two or more years of company accounts or tax calculations and will often assess a limited-company director on salary and dividends drawn, which can look low if you have been leaving profit in the company. Some specialist lenders will instead annualise your day rate — broadly the rate multiplied by a set number of weeks — provided you have a current contract and a track record of contracting. Umbrella employees are sometimes assessed on their payslips like any employee, though short tenure with the umbrella can raise questions.

If a house move or remortgage is close, get it done before you leave permanent employment, or talk to a contractor-specialist broker before you go — and keep your contracts, renewals and accounts organised, because you will be asked for them.

Where the demand actually is

Contracting is not equally available at every level, and this determines whether the choice is even open to you.

Strong and consistent: Financial Controller, Financial Accountant, Management Accountant, Finance Manager — the seats businesses need covered when someone leaves or a project lands.

Strong but lumpier: Finance Director and CFO, where assignments are fewer but longer and better paid, and where reputation matters most. Those assignments run through our sister firm FD Capital.

Qualification remains the baseline in interim work as in permanent — ICAEW, ACCA or CIMA, and clients verify. Genuinely scarce and well paid: regulated-firm finance, CASS, regulatory reporting, consolidation and systems implementation. Specialists in these areas are rarely between assignments — see our FCA-regulated finance practice.

Thinner: newly qualified and first-time roles. Interim clients buy experience they can deploy immediately; contracting suits people with a track record, which is why most contractors who do well start after five or more years post-qualification.

Who it suits

Four honest questions. Can you tolerate income variability — not intellectually, but with your actual commitments? A three-to-six-month cash buffer is the practical entry requirement, and self-employed pension planning needs deliberate attention — MoneyHelper covers the options. Do you have a network? First assignments come from people who know your work far more often than from advertisements; leaving a role on good terms matters more in this career than any other. Do you enjoy the early diagnostic period? Walking into an unfamiliar business, finding out what is wrong and deciding what matters is the recurring core of the work — people who prefer to build over years find it unsatisfying. And do you need to belong somewhere? Some people are energised by moving; others miss the team more than they expect.

The people who thrive in the interim market tend to have two things: enough network that the first assignment finds them, and enough temperament that a four-week gap feels like a holiday rather than a crisis. With both, it is a good career with more variety and more money. With neither, a permanent role with a proper pension is not the lesser choice — it is the right one.

What contracting does to your career

The career effects are mostly positive, but they are not neutral. A run of interim assignments builds breadth quickly — different systems, different audit firms, different owners — and many permanent hiring managers now value that. A CV of three-to-nine-month assignments with clear outcomes (“rebuilt the month-end close from day 15 to day 6”, “led the year-end audit after the FC left”) reads well. A CV of short assignments with no outcomes reads as drift.

What contracting can cost is depth and progression inside one organisation. Interims are rarely given the multi-year strategic projects that build a finance director’s record, and some long-term permanent routes — group finance, PE-backed FD roles — prefer evidence of having stayed to see decisions through. If your ambition is a permanent FD or CFO seat, a period of contracting works best as a chapter, not the whole story. Our accountancy career paths guide sets out the routes, and becoming a fractional financial controller covers the portfolio alternative.

You can also do both

The choice is less binary than it looks. Fixed-term contracts give employment status and benefits with a defined end — a middle option that suits maternity cover and defined projects, particularly up to manager level. Fractional arrangements — one or two days a week, ongoing — let experienced finance leaders build a portfolio of clients rather than a sequence of full-time assignments; our guide to the portfolio FD career covers that route, and interim versus fractional the distinction.

And the movement runs both ways. Contractors return to permanent roles regularly, frequently at a higher level than they left — interim experience is respected, and a period of contracting is no longer read as instability the way it once was. Equally, many interim assignments convert to permanent when both sides want it. If you are moving back, our guide to negotiating your finance salary helps you price the permanent package against what you have been earning.

If you decide to try it

Four practical steps. Secure the first assignment before you resign if you can do so properly — a standing start with no income and no pipeline is the hardest version of this. Build the buffer before, not after. Register with two or three specialists who genuinely work the interim market rather than a dozen who do not — interim shortlists are usually put together within days, so being known before the brief arrives is what matters. Our interim accountancy recruitment team works that market. And set up properly: accountant, company or umbrella, professional indemnity insurance, and a clear understanding of your IR35 position.

Questions about contracting and permanent roles

How many billable days does a finance contractor work in a year?

Around 200–220 in a good year. After bank holidays, 25 days’ holiday and a few days for illness and training, about 222 days are available; gaps between assignments take the rest. Plan on 180–200 until you have a track record.

What day rate matches an £80,000 salary?

Outside IR35, roughly £475–£500 a day at 200 billable days once you replace a 10% bonus, a 5% pension and benefits. Inside IR35 through an umbrella you need closer to £550 to match the same package, because employer NI and the umbrella’s costs come off the rate first.

Who decides whether my contract is inside IR35?

For medium and large private-sector clients and all public-sector bodies, the client decides and must give you a status determination statement with its reasons, which you can challenge. For small private-sector clients, your own company decides.

Should I use a limited company or an umbrella?

A limited company usually makes sense only if most of your work will be outside IR35. For inside-IR35 work an umbrella is simpler. Since April 2026 agencies are liable for umbrella PAYE failures, so expect them to insist on umbrellas from their approved list.

Can I get a mortgage as a contractor?

Yes, but plan ahead. Some lenders annualise your day rate if you have a current contract and contracting history; others want two or more years of accounts. A specialist broker is worth the call before you leave permanent employment.

Will contracting hurt my chances of a permanent role later?

Rarely, if the assignments have clear outcomes. Interim experience is widely respected and assignments regularly convert to permanent. What hurts is a CV of short, unexplained moves.